- maaboensis, Conus maaboensis Icke & Martin, 1907 † - (CONIDAE) (FOSSIL)
- maacki, Cochlicopa maacki Y.I. Starobogatov, 1996 - (COCHLICOPIDAE)
- maacki, Choanomphalus maacki (G. Gerstfeldt, 1859) - (PLANORBIDAE)
- maacki, Kolhymorbis maacki Y.I. Starobogatov & E.A. Streletzkaja, 1967 - syn of: Kolhymorbis angarensis (W. Dybowski & J.G. Grochmalicki, 1925) - (PLANORBIDAE)
- maacki, Lanceolaria maacki I.M. Moskvicheva, 1973 - syn of: Lanceolaria cylindrica (C.T. Simpson, 1900) - (UNIONIDAE)
- maacki andrussowianus, Choanomphalus maacki andrussowianus (W.A. Lindholm, 1909) - (PLANORBIDAE)
- maacki depressior, Helix maacki depressior L. von Schrenck, 1867 - syn of: Karaftohelix maackii (G. Gerstfeldt, 1859) - (HELICIDAE)
- maacki elatior, Choanomphalus maacki elatior W.A. Lindholm, 1909 - (PLANORBIDAE)
- Maackia, Subgenus Baicalia (Maackia) S. Clessin, 1880 (AMNICOLIDAE)
- maackii, Karaftohelix maackii (G. Gerstfeldt, 1859) - (BRADYBAENIDAE)
- maackii, Helix maackii G. Gerstfeldt, 1859 - syn of: Karaftohelix maackii (G. Gerstfeldt, 1859) - (HELICIDAE)
- Maafu, Genus Maafu G.A. Solem, 1983 (CHAROPIDAE)
- maaikeae, Pachydon maaikeae Wesselingh, 2006 † - (CORBULIDAE) (FOSSIL)
- maamouriae, Porcellia maamouriae Termier & Termier, 1977 † - (PORCELLIIDAE) (FOSSIL)
- maamtaoensis, Anomalopleuroides maamtaoensis (H. Guo, 1993 †) - (PHOLADOMYOIDEA (UNASSIGNED)) (FOSSIL)
- maanliauensis, Hemiphaedusa maanliauensis G.L. Chan & W.L. Wu, 1978 - (CLAUSILIIDAE)
- maarensis, Belgrandiella maarensis D.G. Georgiev, 2013 - (HYDROBIIDAE)
- maaseni, Pisidium maaseni J.G.J. Kuiper, 1987 - (SPHAERIIDAE)
- maasseni, Platyla maasseni H.D. Boeters, E. Gittenberger & P. Subai, 1989 - (ACICULIDAE)
- maasseni, Deroceras maasseni A. Wiktor, 1996 - (AGRIOLIMACIDAE)
- maasseni, Montenegrina hiltrudae maasseni E. Gittenberger, 2002 - (CLAUSILIIDAE)
- maasseni, Iglica maasseni H. Schütt, 1980 - (HYDROBIIDAE)
- maasseni, Monacha maasseni B. Hausdorf, 2003 - (HYGROMIIDAE)
- maasseni, Rothifruticicola nicosiana maasseni R.A. Bank, 1991 - (HYGROMIIDAE)
- maasseni, Pisidium maasseni J.G.J. Kuiper, 1987 - syn of: Pisidium maaseni J.G.J. Kuiper, 1987 - (SPHAERIIDAE)
- maassi, Bloyetia maassi R.A.M. Brandt, MS - (UROCYCLIDAE)
- maastrichtiana, Trigonia maastrichtiana Briart, 1888 † - (TRIGONIIDAE) (FOSSIL)
- mabaellae, Marginella mabaellae J.C. Melvill & R. Standen, 1901 - syn of: Volvarina mabellae (J.C. Melvill & R. Standen, 1901) - (MARGINELLIDAE)
- mabarus, Tosapecten pseudohiemalis mabarus T. Kobayashi & M. Ichikawa, 1949 † - (TOSAPECTINIDAE) (FOSSIL)
- mabelae, Jujubinus mabelae E. Rolán & F. Swinnen, 2009 - (TROCHIDAE)
- mabellae, Volvarina mabellae (J.C. Melvill & R. Standen, 1901) - (MARGINELLIDAE)
- mabellae, Prunum mabellae (J.C. Melvill & R. Standen, 1901) - syn of: Volvarina mabellae (J.C. Melvill & R. Standen, 1901) - (MARGINELLIDAE)
- mabellae, Cryptospira mabellae J.C. Melvill & R. Standen, 1901 - syn of: Volvarina mabellae (J.C. Melvill & R. Standen, 1901) - (MARGINELLIDAE)
- Mabellarca, Genus Mabellarca T. Iredale, 1939 (ARCIDAE)
- mabilla, Asteronotus mabilla L.S.R. Bergh, F.D. Abraham, 1877 - syn of: Asteronotus cespitosus (J.C. van Hasselt, 1824) - (DISCODORIDIDAE)
- mabillei, Plekocheilus mabillei (J.C.H. Crosse, 1867) - (AMPHIBULIMIDAE)
- mabillei, Bradybaena mabillei J.C.H. Crosse, 1864 - syn of: Badistes corneovirens (L. Pfeiffer, 1851) - (BRADYBAENIDAE)
- mabillei, Bulimus mabillei J.C.H. Crosse, 1867 - syn of: Plekocheilus mabillei (J.C.H. Crosse, 1867) - (BULIMULIDAE)
- mabillei, Bulla mabillei É.A.A. Locard, 1897 - (BULLIDAE)
- mabillei, Neniatlanta mabillei C.A. Westerlund, 1884 - syn of: Neniatlanta pauli (J.F. Mabille, 1865) - (CLAUSILIIDAE)
- mabillei, Heleobia mabillei J.R. Bourguignat - syn of: Semisalsa stagnorum (J.F. Gmelin, 1791) - (COCHLIOPIDAE)
- mabillei, Helix mabillei J.C.H. Crosse, 1864 - syn of: Badistes corneovirens (L. Pfeiffer, 1851) - (HELICIDAE)
- mabillei, Hydrobia mabillei (J.R. Bourguignat, 1876) - (HYDROBIIDAE)
- mabillei, Mutelina mabillei J. Germain, 1907 - syn of: Mutela mabilli (A. de Rochebrune, 1886) - (IRIDINIDAE)
- mabillei, Spatha mabillei F.P. Jousseaume, 1886 - syn of: Aspatharia pangallensis (A. de Rochebrune, 1882) - (IRIDINIDAE)
- mabillei, Lymnaea mabillei (É.A.A. Locard, 1893) - (LYMNAEIDAE)
- mabillei, Mysella mabillei (W.H. Dall, 1908) - (MONTACUTIDAE)
- mabillei, Nassa mabillei É.A.A. Locard, 1887 † - syn of: Tritia cuvierii (B.C.M. Payraudeau, 1826 †) - (NASSARIIDAE) (FOSSIL)
- mabillei, Nuculana mabillei (P. Dautzenberg & H. Fischer, 1897) - (NUCULANIDAE)
- mabillei, Patella mabillei É.A.A. Locard, 1892 - syn of: Patella depressa T. Pennant, 1777 - (PATELLIDAE)
- mabillei, Perrottetia mabillei (A.R.J.B. Bavay & P. Dautzenberg, 1903) - (STREPTAXIDAE)
- mabillei, Tapes mabillei É.A.A. Locard, 1886 - syn of: Polititapes aureus (J.F. Gmelin, 1791) - (VENERIDAE)
- mabillei angasi, Bulla mabillei angasi (H.A. Pilsbry, 1895) - (BULLIDAE)
- mabillei frasi, Mutelina mabillei frasi J. Germain, 1907 - syn of: Mutela dubia J.F. Gmelin, 1793 - (IRIDINIDAE)
- mabillei gaillardi, Mutelina mabillei gaillardi J. Germain, 1909 - syn of: Mutela joubini (J. Germain, 1904) - (IRIDINIDAE)
- mabillei mamounensis, Spatha mabillei mamounensis J. Germain, 1907 - syn of: Aspatharia rochebrunei (F.P. Jousseaume, 1886) - (IRIDINIDAE)
- mabillei minor, Bradybaena mabillei minor J.C.H. Crosse, 1864 - syn of: Badistes corneovirens minor J.C.H. Crosse, 1864 - (BRADYBAENIDAE)
- mabillei minor, Helix mabillei minor J.C.H. Crosse, 1864 - syn of: Badistes corneovirens minor J.C.H. Crosse, 1864 - (HELICIDAE)
- mabilli, Peringia mabilli J.R. Bourguignat, 1876 - (HYDROBIIDAE)
- mabilli, Mutela mabilli (A. de Rochebrune, 1886) - (IRIDINIDAE)
- mabilli, Mutela mabilli M. Connolly, 1931 - syn of: Mutela zambesiensis G. Mandahl-Barth, 1988 - (IRIDINIDAE)
- mabilli, Pseudodon mabilli A. de Rochebrune, 1881 - syn of: Pseudodon mouhoti I. Lea, 1863 - (UNIONIDAE)
- Mabillia, syn of: Genus Deroceras C.S. Rafinesque, 1820 (AGRIOLIMACIDAE)
- mabilliana, Azeca mabilliana P. Fagot, 1876 - syn of: Azeca goodalli (A.E.J. Férussac, 1821) - (COCHLICOPIDAE)
- mabilliana, Limopsis mabilliana W.H. Dall, 1908 - (LIMOPSIDAE)
- mabilliana, Microcolpia mabilliana J.R. Bourguignat, 1884 - syn of: Microcolpia daudebartii acicularis (A.E.J. Férussac, 1823) - (MELANOPSIDAE)
- mabillianus, Obscurella mabillianus A.de Saint-Simon, 1855 - syn of: Cochlostoma obscurum (J.P.R. Draparnaud, 1801) - (COCHLOSTOMATIDAE)
- Mabilliella, Genus Mabilliella C.M.F. Ancey, 1886 (CERASTUIDAE)
- mabuchii, Mytilus mabuchii K. Oyama & A. Mizuno, 1958 † - (MYTILIDAE) (FOSSIL)
- mabutii, Parvioris mabutii S. Nomura & K.M. Hatai, 1935 - syn of: Parvioris fulvescens (A. Adams, 1866) - (EULIMIDAE)
- mabutii, Melanella mabutii S. Nomura & K.M. Hatai, 1935 - syn of: Parvioris fulvescens (A. Adams, 1866) - (EULIMIDAE)
- mabutii, Odostomia mabutii S. Nomura, 1938 - (PYRAMIDELLIDAE)
- mabuyense, Opisthocoelicum lamellicostatum mabuyense C. de la Torre & P. Bartsch, 1941 - (POMATIIDAE)
- macaeica, Niveria macaeica (D. Fehse & J. Grego, 2005) - (TRIVIIDAE)
- macaensis, Turbonilla macaensis A. Pimenta & R.S. Absalão, 2001 - (PYRAMIDELLIDAE)
- macaensis, Odontocymbiola americana macaensis I.S. Calvo & J. Coltro, 1997 - (VOLUTIDAE)
- macalesteri, Ctenodonta macalesteri Pojeta & Gilbert-Tomlinson, 1977 † - (CTENODONTIDAE) (FOSSIL)
- macaleti, Radix macaleti T.A. Neubauer, M. Harzhauser, A. Kroh, E. Georgopoulou & O. Mandic, - (LYMNAEIDAE) (FOSSIL)
- Macalia, Genus Macalia H. Adams, 1861 (TELLINIDAE)
- Macalina, syn of: Genus Macalia H. Adams, 1861 (TELLINIDAE)
- Macaliopsis, Subgenus Arcopagia (Macaliopsis) A.E.M. Cossmann, 1886 † (TELLINIDAE) (FOSSIL)
- macallisteri, Arcanoceras macallisteri (W.J. Gordon, 1964 †) - (EOGONIOLOBOCERATIDAE) (FOSSIL)
- macalpinei, Tubercliopsis macalpinei (C.F. Laseron, 1951) - (CERITHIOPSIDAE)
- macalpinewoodsi, Rhiostoma macalpinewoodsi F.F. Laidlaw, 1939 - (CYCLOPHORIDAE)
- macandraeae, Triphora macandraeae A. Adams, 1856 - syn of: Laeocochlis sinistratus (P. Nyst, 1835) - (TRIPHORIDAE)
- macandreae, Aporrhais macandreae J.G. Jeffreys, 1867 - syn of: Aporrhais serresianus (A. Michaud, 1828) - (APORRHAIDAE)
- macandreae, Calliostoma macandreae P.P. Carpenter, 1856 - syn of: Calliostoma leanum (C.B. Adams, 1852) - (CALLIOSTOMATIDAE)
- macandreae, Costellaria macandreae A.H. Cooke, 1885 - syn of: Vexillum appelii (C.F. Jickeli, 1874) - (COSTELLARIIDAE)
- macandreae, Epitonium macandreae H. Adams, 1865 - syn of: Epitonium clathratulum Turton, 1806 - (EPITONIIDAE)
- macandreae, Divaricella macandreae (H. Adams, 1871) † - (LUCINIDAE) (FOSSIL)
- macandreae, Lucina macandreae H. Adams, 1871 - syn of: Divaricella macandreae (H. Adams, 1871) † - (LUCINIDAE)
- macandreae, Mormula macandreae A. Adams, 1870 - (PYRAMIDELLIDAE)
- macandreae, Semele macandreae H. Adams, 1870 - syn of: Semele striata (L.A. Reeve, 1853) - (SEMELIDAE)
- macandreae, Triforis macandreae A. Adams, 1856 - syn of: Laeocochlis sinistratus (P. Nyst, 1835) - (TRIPHORIDAE)
- macandrei, Eulima macandrei E. Forbes, 1844 - syn of: Eulimella scillae (A. Scacchi, 1835) - (EULIMIDAE)
- macandrei, Eulimella macandrei E. Forbes, 1844 - syn of: Eulimella scillae (A. Scacchi, 1835) - (PYRAMIDELLIDAE)
- Macandrellus, syn of: Genus Notoplax H. Adams, 1861 (ACANTHOCHITONIDAE)
- macandrewi, Notoplax macandrewi T. Iredale & A.F.B. Hull, 1925 - (ACANTHOCHITONIDAE)
- macandrewi, Spirolaxis macandrewi T. Iredale, 1911 - syn of: Spirolaxis centrifuga (T.A. de M. Monterosato, 1890) - (ARCHITECTONICIDAE)
- macandrewi, Pseudomalaxis macandrewi T. Iredale, 1911 - syn of: Spirolaxis centrifuga (T.A. de M. Monterosato, 1890) - (ARCHITECTONICIDAE)
- macandrewi, Goodallia macandrewi (E.A. Smith, 1881) - (ASTARTIDAE)
- macandrewi, Mitrella macandrewi (G.B. III Sowerby, 1905) - (COLUMBELLIDAE)
- macandrewi, Vexillum macandrewi (G.B. II Sowerby, 1874) - (COSTELLARIIDAE)
- macandrewi, Erosaria macandrewi (G.B. III Sowerby, 1870) - (CYPRAEIDAE)
- macandrewi, Cypraea macandrewi G.B. III Sowerby, 1870 - syn of: Erosaria macandrewi (G.B. III Sowerby, 1870) - (CYPRAEIDAE)
- macandrewi, Dentalium macandrewi M. Boissevain, 1906 - syn of: Dentalium reevei P. Fischer, 1871 - (DENTALIIDAE)
- macandrewi, Atys macandrewi E.A. Smith, 1872 - (HAMINOEIDAE)
- macandrewi, Morum macandrewi (G.B. III Sowerby, 1889) - (HARPIDAE)
- macandrewi, Pseudopythina macandrewi (P. Fischer, 1867) - (KELLIIDAE)
- macandrewi, Pseudopythina macandrewi (E. Fischer-Piette †) - (KELLIIDAE) (FOSSIL)
- macandrewi, Limacina macandrewi E. Forbes & S.C.T. Hanley, 1849 - syn of: Limacina retroversa (J. Fleming, 1823) - (LIMACINIDAE)
- macandrewi, Mitra macandrewi G.B. II Sowerby, 1874 - syn of: Vexillum macandrewi (G.B. II Sowerby, 1874) - (MITRIDAE)
- macandrewi, Orthalicus macandrewi (G.B. III Sowerby, 1889) - (ORTHALICIDAE)
- macandrewi, Tritonoturris macandrewi (E.A. Smith, 1882) - (RAPHITOMIDAE)
- macandrewi, Alvania macandrewi (A. Manzoni, 1868) - (RISSOIDAE)
- macandrewi, Amoria macandrewi (G.B. III Sowerby, 1887) - (VOLUTIDAE)
- macandrewi spreta, Alvania macandrewi spreta (R.B. Watson, 1873) - (RISSOIDAE)
- macandrewiana, Theba macandrewiana (L. Pfeiffer, 1833) - (HELICIDAE)
- macandrewiana, Fadyenia macandrewiana (E. Chitty, 1857) - (HELICINIDAE)
- macandrewii, Anadema macandrewii (O.A.L. Mörch, 1868) - (COLLONIIDAE)
- macandrewii, Nucula macandrewii S.C.T. Hanley, 1860 - syn of: Ennucula aegeensis (E. Forbes, 1844) - (NUCULIDAE)
- macandrewii, Euterebra macandrewii (E.A. Smith, 1877) - (TEREBRIDAE)
- macandrewii, Turbo macandrewii O.A.L. Mörch, 1868 - syn of: Anadema macandrewii (O.A.L. Mörch, 1868) - (TURBINIDAE)
- macaoi, Volvarina macaoi J. Espinosa, L. Moro & J.A. Ortea, 2011 - (MARGINELLIDAE)
- macapa, Doryssa macapa (S. Moricand, 1856) - (PACHYCHILIDAE)
- macarae, Conus macarae M. Bernardi, 1857 - syn of: Kioconus voluminalis (L.A. Reeve, 1843) - (CONIDAE)
- macarae, Tropidophora macarae S.A.A. Petit De La Saussaye, 1853 - (POMATIIDAE)
- macaraea, Tropidophora semidecussata macaraea S.A.A. Petit De La Saussaye, 1853 - (POMATIIDAE)
- macarana, Medora macarana (E.A. Rossmässler, 1835) - (CLAUSILIIDAE)
- macarana, Helix macarana J.K. Megerle Von Mühlfeld, 1846 - syn of: Chilostoma pouzolzi (G.P. Deshayes, 1830 ) - (HELICIDAE)
- macareae, Tropidophora macareae (S.A.A. Petit De La Saussaye, 1853) - (POMATIIDAE)
- macarioi, Gibberula macarioi J. Espinosa & J.A. Ortea, 2006 - (CYSTISCIDAE)
- macaron, Microgloma macaron N.P. Benaim & R.S. Absalão, 2011 - (YOLDIIDAE)
- Macaronapaeus, syn of: Genus Napaeus J.A. Albers, 1850 (ENIDAE)
- macaronesica, Xerotricha macaronesica P. Hesse, 1932 - syn of: Xerotricha nubivaga (J.F. Mabille, 1882) - (HYGROMIIDAE)
- Macaropoma, Genus Macaropoma Kobelt & Möllendorff, 1898 (COCHLOSTOMATIDAE)
- macarovicii, Viviparus macarovicii Lubenescu & Zazuleac, 1985 † - (VIVIPARIDAE) (FOSSIL)
- macarscaensis, Medora macarscaensis G.B. I Sowerby, 1828 - syn of: Medora macascarensis (G.B. I Sowerby, 1828) - (CLAUSILIIDAE)
- macarum, Cerithium macarum A.A. Olsson, 1931 † - (CERITHIIDAE) (FOSSIL)
- macascarensis, Medora macascarensis (G.B. I Sowerby, 1828) - (CLAUSILIIDAE)
- macascarensis albescens, Medora macascarensis albescens (K.T. Menke, 1830) - (CLAUSILIIDAE)
- macascarensis barbieri, Medora macascarensis barbieri (J. Zelebor, 1868) - (CLAUSILIIDAE)
- macascarensis brancsiki, Medora macascarensis brancsiki Z. Fehér, 2000 - (CLAUSILIIDAE)
- macascarensis brusinae, Medora macascarensis brusinae (Š. Brusina, 1866) - (CLAUSILIIDAE)
- macascarensis carniolica, Medora macascarensis carniolica (H.C. Küster, 1854) - (CLAUSILIIDAE)
- macascarensis clissana, Medora macascarensis clissana (K. Brancsik, 1897) - (CLAUSILIIDAE)
- macascarensis graciliformis, Medora macascarensis graciliformis (L. Pfeiffer, 1866) - (CLAUSILIIDAE)
- macascarensis livnoensis, Medora macascarensis livnoensis H. Nordsieck, 1970 - (CLAUSILIIDAE)
- macascarensis livnoensis, Medora macascarensis livnoensis H. Nordsieck, 1970 - syn of: Medora macascarensis livnoensis H. Nordsieck, 1970 - (CLAUSILIIDAE)
- macascarensis pliculosa, Medora macascarensis pliculosa (C.A. Westerlund, 1884) - (CLAUSILIIDAE)
- macascarensis prenjensis, Medora macascarensis prenjensis (A.J. Wagner, 1918) - (CLAUSILIIDAE)
- macascarensis siriae, Medora macascarensis siriae H. Nordsieck, 2009 - (CLAUSILIIDAE)
- macascarensis troglavensis, Medora macascarensis troglavensis (A.J. Wagner, 1912) - (CLAUSILIIDAE)
- macascarensis unae, Medora macascarensis unae H. Nordsieck, 1974 - (CLAUSILIIDAE)
- macascarensis unae, Medora macascarensis unae H. Nordsieck, 1974 - syn of: Medora macascarensis unae H. Nordsieck, 1974 - (CLAUSILIIDAE)
- macasi, Epiphragmophora macasi (H.C. Higgins, 1872) - (EPIPHRAGMOPHORIDAE)
- macassarana, Flabellina macassarana L.S.R. Bergh, 1905 - (FLABELLINIDAE)
- macassarensis, Annachlamys macassarensis J.C. Chenu, 1845 - syn of: Annachlamys striatula (C. Linnaeus, 1758) - (PECTINIDAE)
- macassarensis rena, Annachlamys macassarensis rena T. Iredale, 1939 - syn of: Annachlamys kuhnholtzi (A.C. Bernardi, 1860) - (PECTINIDAE)
- macassari, Cardiolucina macassari (B. Prashad, 1932) - (LUCINIDAE)
- macassariensis, Tellina macassariensis B. Prashad, 1932 - (TELLINIDAE)
- macaulayi, Austropyrgus macaulayi A. Clark, W.B. Miller & W.F. Ponder, 2003 - (HYDROBIIDAE)
- macaulayi, Lioconcha macaulayi K.L. Lamprell & J.M. Healy, 2002 - (VENERIDAE)
- macauleyensis, Siphonaria macauleyensis W.R.B. Oliver, 1915 - syn of: Siphonaria raoulensis W.R.B. Oliver, 1915 - (SIPHONARIIDAE)
- macauleyensis perplexa, Siphonaria macauleyensis perplexa W.R.B. Oliver, 1915 - syn of: Siphonaria raoulensis W.R.B. Oliver, 1915 - (SIPHONARIIDAE)
- macbeathi, Amalda macbeathi (P. Vella, 1954 †) - (ANCILLARIIDAE) (FOSSIL)
- macbrideae, Siphocypraea macbrideae E.J. Petuch, 1998 † - (CYPRAEIDAE) (FOSSIL)
- macbridei, Conus macbridei F.Jr. Lorenz, 2005 - syn of: Harmoniconus mcbridei (F.Jr. Lorenz, 2005) - (CONIDAE)
- macbridei, Turbonilla macbridei W.H. Dall & P. Bartsch, 1909 - (PYRAMIDELLIDAE)
- maccallumi, Strangulites maccallumi (Reed, 1921 †) - (SINUITIDAE) (FOSSIL)
- maccamleyi, Galeodea maccamleyi W.F. Ponder, 1983 - (CASSIDAE)
- maccarthyi, Glossodoris maccarthyi E.F. Kelaart, 1859 - syn of: Doriprismatica atromarginata (G.L.C.F.D. Cuvier, 1804) - (CHROMODORIDIDAE)
- maccarthyi, Doris maccarthyi E.F. Kelaart, 1859 - syn of: Doriprismatica atromarginata (G.L.C.F.D. Cuvier, 1804) - (DORIDIDAE)
- maccauslandi, Nassarius maccauslandi W.O. Cernohorsky, 1984 - (NASSARIIDAE)
- macchiata, Doris macchiata A. Risso - syn of: Doris marmorata A. Risso, 1818 - (DORIDIDAE)
- maccleeryi, Demissa maccleeryi F. Boyer, 2016 - (MARGINELLIDAE)
- macclintocki, Discus macclintocki H.B. Baker, 1928 - (DISCIDAE)
- Macclintockia, Genus Macclintockia Heer, 1868 (NACELLIDAE)
- macclurgi, Emarginula macclurgi R.N. Kilburn, 1978 - (FISSURELLIDAE)
- macclurgi, Bassinaria macclurgi J. Marwick, 1928 - syn of: Bassina yatei (J.E. Gray, 1835) - (VENERIDAE)
- macconkeyi, Scalptia macconkeyi F.P. Jousseaume, 1894 - syn of: Scalptia hystrix (L.A. Reeve, 1856) - (CANCELLARIIDAE)
- macconnelli, Hollandites macconnelli (McLearn, 1946 †) - (BEYRICHITIDAE) (FOSSIL)
- macconnelli, Nathorstites macconnelli (J.J.F. Whiteaves, 1889 †) - (NATHORSTITIDAE) (FOSSIL)
- macconnelli, Wasatchites macconnelli Tozer, 1994 † - (PRIONITIDAE) (FOSSIL)
- maccormacki, Cassis maccormacki A.A. Olsson, 1928 † - (CASSIDAE) (FOSSIL)
- Maccoyella, Genus Maccoyella Etheridge, 1892 † (OXYTOMIDAE) (FOSSIL)
- maccoyi, Austrorissopsis maccoyi (J.E. Tenison-Woods, 1876) - (ACLIDIDAE)
- maccoyi, Barbatia maccoyi J.E. Tenison-Woods, 1878 - syn of: Acar squamosa (J.B.P.A. Lamarck, 1819) - (ARCIDAE)
- maccoyi, Sigapatella maccoyi (H.H. Suter, 1917 †) - (CALYPTRAEIDAE) (FOSSIL)
- maccoyi, Sydaphera maccoyi G.B. Pritchard & J.H. Gatliff, 1899 - syn of: Merica purpuriformis (L.C. Kiener, 1841) - (CANCELLARIIDAE)
- maccoyi, Glycymeris maccoyi (Johnston, 1880 †) - (GLYCYMERIDIDAE) (FOSSIL)
- maccoyi, Limopsis maccoyi A.C. Chapman, 1911 † - (LIMOPSIDAE) (FOSSIL)
- maccoyi, Euguraleus maccoyi W.F. Petterd, 1879 - syn of: Guraleus tasmanicus (J.E. Tenison-Woods, 1876) - (MANGELIIDAE)
- maccoyi, Typhis maccoyi (J.E. Tenison-Woods, 1876 †) - (MURICIDAE) (FOSSIL)
- maccoyi, Pellasimnia maccoyi (J.E. Tenison-Woods, 1878) - (OVULIDAE)
- maccoyi, Dissona maccoyi J.E. Tenison-Woods, 1878 - syn of: Pellasimnia maccoyi (J.E. Tenison-Woods, 1878) - (OVULIDAE)
- maccoyi, Carinaropsis maccoyi Reed, 1921 † - (PTEROTHECIDAE) (FOSSIL)
- maccoyi, Rissopsetia maccoyi (J.E. Tenison-Woods, 1877) - (PYRAMIDELLIDAE)
- maccoyi, Maccoyoceras maccoyi (J.S. Turner, 1954 †) - (TRIGONOCERATIDAE) (FOSSIL)
- maccoyi, Notopeplum maccoyi (Tenison Woods, 1877 †) - (VOLUTIDAE) (FOSSIL)
- maccoyii, Edmondia maccoyii Hind † - (EDMONDIIDAE) (FOSSIL)
- Maccoyoceras, Genus Maccoyoceras Miller & al., 1933 † (TRIGONOCERATIDAE) (FOSSIL)
- maccullochi, Kokenospira maccullochi Reed, 1921 † - (BUCANIIDAE) (FOSSIL)
- maccullochi, Pteria maccullochi T. Iredale, 1939 - syn of: Pteria penguin (P.F. Röding, 1798) - (PTERIIDAE)
- maccullochi, Odostomia maccullochi C. Hedley, 1909 - (PYRAMIDELLIDAE)
- maccullochi, Notogibbula maccullochi (C. Hedley, 1907) - (TROCHIDAE)
- macculochi, Eurytrochus macculochi (C. Hedley, 1907) - (TROCHIDAE)
- macdonaldi, Bathybembix macdonaldi (W.H. Dall, 1890) - (CALLIOTROPIDAE)
- macdonaldi, Corbula macdonaldi W.H. Dall, 1912 - syn of: Panamicorbula ventricosa (Adams & L.A. Reeve, 1850) - (CORBULIDAE)
- macdonaldi, Fasciolaria macdonaldi A.A. Olsson, 1922 † - (FASCIOLARIIDAE) (FOSSIL)
- macdonaldi, Morum macdonaldi W.K. Emerson, 1981 - (HARPIDAE)
- macdonaldi, Marginella macdonaldi W.H. Dall, 1912 † - (MARGINELLIDAE) (FOSSIL)
- macdonaldi, Idas macdonaldi R.G. Gustafson, R.D. Turner, R.A. Lutz & R.C. Vrijenhoek, 1998 - (MYTILIDAE)
- macdonaldi, Noetia macdonaldi W.H. Dall, 1912 † - (NOETIIDAE) (FOSSIL)
- macdonaldi, Notobranchaea macdonaldi J.P.L. Pelseneer, 1886 - (NOTOBRANCHAEIDAE)
- macdonaldi, Leopecten gatunensis macdonaldi (A.A. Olsson, 1922) - (PECTINIDAE)
- macdonaldi, Centrotarphyceras macdonaldi (A. Hyatt, 1894 †) - (TARPHYCERATIDAE) (FOSSIL)
- macdonaldi, Eselaevitrigonia macdonaldi D.P. Kelly, 1995 † - (TRIGONIIDAE) (FOSSIL)
- macdonaldi, Cymbiola macdonaldi R. Tate, 1889 † - (VOLUTIDAE) (FOSSIL)
- macdonaldi pelseneeri, Notobranchaea macdonaldi pelseneeri A. Pruvot-Fol, 1942 - (NOTOBRANCHAEIDAE)
- macdonaldii, Aneitea macdonaldii Gray, 1860 - (ATHORACOPHORIDAE)
- macdonnelli, Leptechioceras macdonnelli (Portlock, 1843 †) - (ECHIOCERATIDAE) (FOSSIL)
- macdonnelli, Gastrocopta macdonnelli (J.W. Brazier, 1875) - (GASTROCOPTIDAE)
- macdougalli, Microcystina macdougalli (A. Issel, 1874) - (ARIOPHANTIDAE)
- macdowelli, Kuia macdowelli J. Marwick, 1927 † - (VENERIDAE) (FOSSIL)
- maceana, Clausilia maceana J.R. Bourguignat, 1869 - syn of: Clausilia bidentata crenulata A. Risso, 1826 - (CLAUSILIIDAE)
- maceana, Mercuria maceana (A. Paladilhe, 1869) - (HYDROBIIDAE)
- maceana, Vitrina maceana J.R. Bourguignat, 1894 - syn of: Vitrina pellucida (O.F. Müller, 1774) - (VITRINIDAE)
- maceanus, Oxychilus maceanus (J.R. Bourguignat, 1869) - (OXYCHILIDAE)
- macedoi, Scutalus macedoi W.K. Weyrauch, 1967 - (BULIMULIDAE)
- macedonensis, Austropyrgus macedonensis A. Clark, W.B. Miller & W.F. Ponder, 2003 - (HYDROBIIDAE)
- macedonica, Parabythinella macedonica (S. Hadžišce, 1963) - (AMNICOLIDAE)
- Macedonica, Genus Macedonica O. Böttger, 1877 (CLAUSILIIDAE)
- macedonica, Macedonica macedonica (E.A. Rossmässler, 1839) - (CLAUSILIIDAE)
- macedonica, Chondrula macedonica A.J. Wagner, 1915 - (ENIDAE)
- macedonica, Sumia macedonica P. Glöer & Mrkvicka, 2015 - (HYDROBIIDAE)
- macedonica, Ohridopyrgula macedonica (Š. Brusina, 1896) - (HYDROBIIDAE)
- macedonica, Graecoanatolica macedonica P. Radoman & S. Stankovic, 1979 - (HYDROBIIDAE)
- macedonica, Horatia macedonica (L. Kušcer, 1937) - (HYDROBIIDAE)
- macedonica, Grossuana euxina macedonica P. Radoman, 1973 - (HYDROBIIDAE)
- macedonica, Helicella macedonica P. Hesse, 1928 - (HYGROMIIDAE)
- macedonica, Tandonia macedonica (W. Rähle, 1974) - (MILACIDAE)
- macedonica, Holandriana macedonica (Burgerstein, 1877 †) - (PLEUROCERIDAE) (FOSSIL)
- macedonica, Melania macedonica Burgerstein, 1877 † - syn of: Holandriana macedonica (Burgerstein, 1877 †) - (THIARIDAE) (FOSSIL)
- macedonica cazanikensis, Chondrula macedonica cazanikensis A.J. Wagner, 1915 - (ENIDAE)
- macedonica charensis, Ohridopyrgula macedonica charensis P. Radoman, 1978 - (HYDROBIIDAE)
- macedonica inopinata, Macedonica macedonica inopinata R.A.M. Brandt, 1962 - (CLAUSILIIDAE)
- macedonica procheuma, Chondrula macedonica procheuma A.J. Wagner, 1915 - (ENIDAE)
- macedonicus, Acroloxus macedonicus S. Hadžišce, 1959 - (ACROLOXIDAE)
- macedonicus, Limax macedonicus P. Hesse, 1928 - (LIMACIDAE)
- macedonicus, Theodoxus macedonicus W.A. Wenz, 1943 † - (NERITIDAE) (FOSSIL)
- macedonicus, Planorbis macedonicus R. Sturany, 1894 - (PLANORBIDAE)
- macedoniensis, Ouranopithecus macedoniensis Bonis & Melentis, 1977 † - (Hominidae) (FOSSIL)
- Macedopyrgula, Genus Macedopyrgula P. Radoman, 1974 (HYDROBIIDAE)
- macei, Eupaludestrina macei (A. Paladilhe, 1867) - (COCHLIOPIDAE)
- macei, Cochlostoma macei (J.R. Bourguignat, 1869) - (COCHLOSTOMATIDAE)
- macei, Conus macei J.C.H. Crosse, 1865 - syn of: Sciteconus mozambicus (C.H. Hwass in J.G. Bruguière, 1792) - (CONIDAE)
- macei, Hydrobia macei A. Paladilhe, 1867 - syn of: Eupaludestrina macei (A. Paladilhe, 1867) - (HYDROBIIDAE)
- macei, Valvata macei É.A.A. Locard, 1884 - (VALVATIDAE)
- maceki, Zagrabica maceki Š. Brusina, 1884 † - (LYMNAEIDAE) (FOSSIL)
- macella, Surcula macella J.C. Melvill, 1923 - syn of: Agladrillia macella (J.C. Melvill, 1923) - (CLAVATULIDAE)
- macella, Cochlicella macella T.A. de M. Monterosato, 1892 - syn of: Cochlicella acuta (O.F. Müller, 1774) - (COCHLICELLIDAE)
- macella, Agladrillia macella (J.C. Melvill, 1923) - (DRILLIIDAE)
- macella, Inkinga macella J.C. Melvill, 1923 - syn of: Inkinga platystoma (E.A. Smith, 1877) - (HORAICLAVIDAE)
- macella, Nuculana macella K.H. Barnard, 1963 - syn of: Nuculana vestita (É.A.A. Locard, 1898) - (NUCULANIDAE)
- macella, Syrnola macella E. Saurin, 1962 - (PYRAMIDELLIDAE)
- macella, Syrnola macella G.A. Brugnone, 1873 - syn of: Syrnola minuta H. Adams, 1869 - (PYRAMIDELLIDAE)
- macella, Alvania macella S. Gofas, 2007 - (RISSOIDAE)
- macella, Anodonta macella H. Drouët, 1893 - syn of: Anodonta cygnea (C. Linnaeus, 1758) - (UNIONIDAE)
- Macellomenia, Genus Macellomenia H.R. Simroth, 1893 (MACELLOMENIIDAE)
- MACELLOMENIIDAE Salvini-Plawen, 1978 - Family (SOLENOGASTRES-SOLENOGASTRES [Subclass]-PHOLIDOSKEPIA [Order])
- Maceo, Subgenus Idiostemma (Maceo) H.A. Pilsbry & E.G. Vanatta, 1898 (UROCOPTIDAE)
- maceoi, Chondrothyrella assimilis maceoi C. de la Torre & P. Bartsch, 1938 - (POMATIIDAE)
- maceoi, Tomelasmus irroratus maceoi C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- macer, Scobinella macer T.L. Casey, 1903 † - (CLATHURELLIDAE) (FOSSIL)
- macer, Halorites macer (Mojsisovics, 1893 †) - (HALORITIDAE) (FOSSIL)
- macer, Poecilomorphus macer Buckman † - (HAPLOCERATIDAE) (FOSSIL)
- macer, Peruniscus macer (Billings, 1865 †) - (TROPIDODISCIDAE) (FOSSIL)
- macer, Unio macer I. Lea, 1857 - syn of: Elliptio roanokensis I. Lea, 1838 - (UNIONIDAE)
- macera, Hennocquia macera (A.E.M. Cossmann, 1885 †) - (ACMAEIDAE) (FOSSIL)
- macera, Salpingostoma macera E.F.R.K. Koken & J. Perner, 1925 † - (BUCANIIDAE) (FOSSIL)
- macera, Patella macera A.E.M. Cossmann, 1885 † - syn of: Hennocquia macera (A.E.M. Cossmann, 1885 †) - (PATELLIDAE) (FOSSIL)
- macerata, Amastra nubilosa macerata A. Hyatt & H.A. Pilsbry, 1911 - (AMASTRIDAE)
- macerata, Cucullaea macerata Boehm, 1881 † - (CUCULLAEIDAE) (FOSSIL)
- Maceratites, syn of: Genus Witchellia Imlay, 1964 † (HAMMATOCERATIDAE) (FOSSIL)
- maceratus, Nemodon maceratus Boehm, 1881 † - (PARALLELODONTIDAE) (FOSSIL)
- Maceris, syn of: Genus Chama C. Linnaeus, 1758 (CHAMIDAE)
- macerophylla, Chama macerophylla J.F. Gmelin, 1791 - (CHAMIDAE)
- Macerophylla, syn of: Genus Chama C. Linnaeus, 1758 (CHAMIDAE)
- macerophylla purpurascens, Chama macerophylla purpurascens C.M. Poulsen, 1878 - syn of: Chama macerophylla J.F. Gmelin, 1791 - (CHAMIDAE)
- macerophylla sulphurea, Chama macerophylla sulphurea C.M. Poulsen, 1878 - syn of: Chama macerophylla J.F. Gmelin, 1791 - (CHAMIDAE)
- Macerovillia, syn of: Genus Chama C. Linnaeus, 1758 (CHAMIDAE)
- Macertexta, syn of: Genus Styliferina A. Adams, 1860 (LITIOPIDAE)
- macerwinii, Littorina macerwinii R.A. Philippi, 1847 - syn of: Littorina compressa J.G. Jeffreys, 1865 - (LITTORINIDAE)
- macfadyeni, Bulla macfadyeni Cox, 1935 † - (BULLIDAE) (FOSSIL)
- macfadyeni, Costellaria macfadyeni L.R. Cox, 1930 - syn of: Vexillum mirabile (A. Adams, 1853) - (COSTELLARIIDAE)
- macfadyeni, Pseudisocardia macfadyeni Cox, 1935 † - (DICEROCARDIIDAE) (FOSSIL)
- macfadyeni, Cimomia macfadyeni F. Haas & Miller, 1952 † - (HERCOGLOSSIDAE) (FOSSIL)
- macfadyeni, Aequipecten macfadyeni L.R. Cox, 1935 † - (PECTINIDAE) (FOSSIL)
- Macfarlandaea, syn of: Genus Pleurobranchaea J.F. Meckel in S.F. Leue, 1813 (PLEUROBRANCHAEIDAE)
- macfarlandi, Placostylus macfarlandi (J.W. Brazier, 1875) - (BOTHRIEMBRYONTIDAE)
- macfarlandi, Felimida macfarlandi (T.D.A. Cockerell, 1901) - (CHROMODORIDIDAE)
- macfarlandi, Dendrodoris macfarlandi J.M. Ostergaard, 1955 - syn of: Dendrodoris nigra (W. Stimpson, 1855) - (DENDRODORIDIDAE)
- macfarlandi, Platydoris macfarlandi G.D. Hanna, 1951 - (DISCODORIDIDAE)
- macfarlandi, Runcina macfarlandi T.M. Gosliner, 1991 - (RUNCINIDAE)
- macfarlanei, Megalacron macfarlanei (J.C. Cox, 1873) - (CAMAENIDAE)
- macfarlani, Malagasitrigonia macfarlani C.A. Fleming, 1987 † - (TRIGONIIDAE) (FOSSIL)
- macgillavryi, Antillosarcolites macgillavryi Chubb, 1968 † - (ANTILLOCAPRINIDAE) (FOSSIL)
- Macgillavryia, Genus Macgillavryia Rojas & al., 1995 † (RADIOLITIDAE) (FOSSIL)
- macgillivrayana, Charopa macgillivrayana T. Iredale, 1913 - (CHAROPIDAE)
- macgillivrayana, Fadyenia macgillivrayana E. Chitty, 1857 - (HELICINIDAE)
- Macgillivrayella, syn of: Genus Hawaiia G.P.L.K. Gude, 1911 (PRISTILOMATIDAE)
- macgillivrayi, Placocharis macgillivrayi (L. Pfeiffer, 1855) - (BOTHRIEMBRYONTIDAE)
- macgillivrayi, Bulimus macgillivrayi L. Pfeiffer, 1855 - syn of: Placocharis macgillivrayi (L. Pfeiffer, 1855) - (BULIMULIDAE)
- macgillivrayi, Papuina macgillivrayi (E. Forbes, 1852) - (CAMAENIDAE)
- macgillivrayi, Chiton macgillivrayi A. Adams, 1855 - syn of: Acanthopleura gemmata (H.M.D. de Blainville, 1825) - (CHITONIDAE)
- macgillivrayi, Corbula macgillivrayi E.A. Smith, 1885 - (CORBULIDAE)
- macgillivrayi, Cyclotus macgillivrayi L. Pfeiffer - syn of: Gonatorhaphe fornicata macgillivrayi L. Pfeiffer - (CYCLOPHORIDAE)
- macgillivrayi, Palaina macgillivrayi (L. Pfeiffer, 1855) - (DIPLOMMATINIDAE)
- macgillivrayi, Limopsis macgillivrayi A. Adams, 1863 - (LIMOPSIDAE)
- macgillivrayi, Oenopota macgillivrayi C.B. Adams, 1850 - syn of: Curtitoma trevelliana (W. Turton, 1834) - (MANGELIIDAE)
- macgillivrayi, Murex brevispina macgillivrayi W.L.H. Dohrn, 1862 - (MURICIDAE)
- macgillivrayi, Gonatorhaphe fornicata macgillivrayi L. Pfeiffer - (NEOCYCLOTIDAE)
- macgillivrayi, Neritina macgillivrayi L.A. Reeve, 1855 - (NERITIDAE)
- macgillivrayi, Cyclostoma macgillivrayi L. Pfeiffer - syn of: Gonatorhaphe fornicata macgillivrayi L. Pfeiffer - (POMATIIDAE)
- macgillivrayi, Siphonaria macgillivrayi L.A. Reeve, 1856 - (SIPHONARIIDAE)
- macgillivrayi, Sphaerium macgillivrayi E.A. Smith, 1882 - syn of: Pisidium tasmanicum J.E. Tenison-Woods, 1876 - (SPHAERIIDAE)
- macgillivrayi, Terebra macgillivrayi E.A. Smith, 1873 - syn of: Terebra textilis R.B. Hinds, 1844 - (TEREBRIDAE)
- macgillivrayi, Cymbiola macgillivrayi J.C. Cox, 1873 - syn of: Cymbiola rutila macgillivrayi (J.C. Cox, 1873) - (VOLUTIDAE)
- macgillivrayi, Cymbiola rutila macgillivrayi (J.C. Cox, 1873) - (VOLUTIDAE)
- macgillivrayi actaviva, Oblimopa macgillivrayi actaviva T. Iredale, 1939 - syn of: Limopsis macgillivrayi A. Adams, 1863 - (LIMOPSIDAE)
- macgillivrayi lata, Siphonaria macgillivrayi lata C. Vélain, 1877 - (SIPHONARIIDAE)
- macgillivrayi semilevis, Palaina macgillivrayi semilevis T. Iredale, 1944 - (DIPLOMMATINIDAE)
- Macgillivrayia, syn of: Genus Tonna M.T. Brünnich, 1772 (TONNIDAE)
- macgillvrayi, Placostylus macgillvrayi L. Pfeiffer, 1855 - syn of: Placocharis macgillivrayi (L. Pfeiffer, 1855) - (BOTHRIEMBRYONTIDAE)
- macginnorum, Scaphella macginnorum E.F. Garcia & W.K. Emerson, 1987 - (VOLUTIDAE)
- macginorum, Scaphella macginorum E.F. Garcia, 1987 - syn of: Scaphella macginnorum E.F. Garcia & W.K. Emerson, 1987 - (VOLUTIDAE)
- Macgintiella, Subgenus Olivella (Macgintiella) A.A. Olsson, 1956 † (OLIVELLIDAE) (FOSSIL)
- macgintyi, Conus macgintyi H.A. Pilsbry, 1955 - syn of: Conasprella mcgintyi (H.A. Pilsbry, 1955) - (CONIDAE)
- macgintyi, Hyotissa macgintyi H.W. Harry, 1985 - syn of: Hyotissa mcgintyi (H.W. Harry, 1985) - (GRYPHAEIDAE)
- macgintyi, Morum macgintyi M. Smith, 1937 † - (HARPIDAE) (FOSSIL)
- macgintyi, Murexiella macgintyi (M. Smith, 1938) - (MURICIDAE)
- macgintyi, Attiliosa macgintyi E.H. Vokes, 1999 † - (MURICIDAE) (FOSSIL)
- macgintyi, Murex macgintyi M. Smith, 1938 - syn of: Murexiella macgintyi (M. Smith, 1938) - (MURICIDAE)
- macgintyi, Olivella macgintyi A.A. Olsson, 1956 - (OLIVELLIDAE)
- macgintyi, Cyphoma macgintyi H.A. Pilsbry, 1939 - syn of: Cyphoma mcgintyi H.A. Pilsbry, 1939 - (OVULIDAE)
- macgintyi, Distorsio macgintyi W.K. Emerson & E.L. Puffer, 1954 - syn of: Distorsio constricta mcgintyi W.K. Emerson & E.L. Puffer, 1953 - (PERSONIDAE)
- macgintyi, Eubela macgintyi J.S. Schwengel, 1943 - syn of: Eubela mcgintyi J.S. Schwengel, 1943 - (RAPHITOMIDAE)
- macgintyi fasciatus, Murexiella macgintyi fasciatus (E.H. Vokes, 1970) - (MURICIDAE)
- macglameriana, Elimia macglameriana C. Goodrich, 1936 - (PLEUROCERIDAE)
- macgordoni, Marmolatella macgordoni Jeffery & al., 1994 † - (DELPHINULOPSIDAE) (FOSSIL)
- macgregori, Tetrabelus macgregori Glaessner, 1945 † - (DIMITOBELIDAE) (FOSSIL)
- macgregori, Dunbarella macgregori (Currie) † - (PTERINOPECTINIDAE) (FOSSIL)
- macgregori, Schistoloma macgregori P. Bartsch, 1909 - (PUPINIDAE)
- macgregori, Pupinella macgregori E.A. Smith, 1889 - (PUPINIDAE)
- macgregori, Coxia macgregori (J.C. Cox, 1870) - (TROCHOMORPHIDAE)
- macha, Ensis macha (Molina, 1782) - (PHARIDAE)
- Macha, syn of: Genus Solecurtus H.M.D. De Blainville, 1824 (SOLECURTIDAE)
- Macha, syn of: Genus Solecurtus H.M.D. De Blainville, 1824 (SOLECURTIDAE)
- machachensis, Achatina machachensis E.A. Smith, 1902 - (ACHATINIDAE)
- machadoensis, Corona machadoensis H. Strebel, 1909 - (ORTHALICIDAE)
- machadoi, Gonyodiscus machadoi H. Milne-Edwards, 1885 - syn of: Gonyodiscus rotundatus (O.F. Müller, 1774) - (DISCIDAE)
- machadoi, Theba machadoi É.A.A. Locard, 1887 - syn of: Theba pisana (O.F. Müller, 1774) - (HELICIDAE)
- machadoi, Insulivitrina machadoi (C.M. Ibáñez & M.R. Alonso, 1990) - (VITRINIDAE)
- machadoia, Anodonta machadoia É.A.A. Locard, 1890 - syn of: Anodonta cygnea (C. Linnaeus, 1758) - (UNIONIDAE)
- machadoiana, Anodonta machadoiana J. Da Silva e Castro, 1883 - syn of: Anodonta cygnea (C. Linnaeus, 1758) - (UNIONIDAE)
- Machaena, syn of: Genus Paphies R.P. Lesson, 1831 (MESODESMATIDAE)
- Machaera, syn of: Genus Siliqua J.K. Megerle Von Mühlfeld, 1811 (PHARIDAE)
- Machaerodonax, syn of: Genus Donax C. Linnaeus, 1758 (DONACIDAE)
- machaerophorus, Arrhoges machaerophorus Pethö, 1906 † - (APORRHAIDAE) (FOSSIL)
- Machaeroplax, syn of: Genus Solariella S.V. Wood, 1842 (SOLARIELLIDAE)
- machaeropsis, Campylorhaphion machaeropsis (P. Dautzenberg & H. Fischer, 1896) - (EULIMIDAE)
- machaira, Microsveltia machaira A. Verhecken, 2011 - (CANCELLARIIDAE)
- machangpingensis, Gymnites machangpingensis J.K. Zhao & Wang, 1974 † - (GYMNITIDAE) (FOSSIL)
- machapooreensis, Liotia machapooreensis W.C. Mansfield, 1925 † - (LIOTIIDAE) (FOSSIL)
- machapoorenis paraguanensis, Turritella machapoorenis paraguanensis F. Hodson, 1931 - syn of: Turritella paraguanensis (F. Hodson, 1926 †) - (TURRITELLIDAE)
- machapoorensis, Gemmula machapoorensis C.J. Maury, 1925 † - (TURRIDAE) (FOSSIL)
- machapoorensis, Turritella machapoorensis C.J. Maury, 1925 † - (TURRITELLIDAE) (FOSSIL)
- machaporiensis, Agnocardia machaporiensis (C.J. Maury, 1925 †) - (CARDIIDAE) (FOSSIL)
- macharei, Trophon macharei DeVries, 2005 † - (MURICIDAE) (FOSSIL)
- machelae, Uroteuthis machelae M.A.C. Roeleveld & Augustyn, 2005 - (LOLIGINIDAE)
- macheli, Arrhoges macheli Gliozzi & Malatesta, 1983 † - (APORRHAIDAE) (FOSSIL)
- machenryi, Rhenozyga machenryi (Cook, 1997 †) - (PALAEOZYGOPLEURIDAE) (FOSSIL)
- machiakouense, Stereoplasmoceras machiakouense A.W. Grabau † - (STEREOPLASMOCERATIDAE) (FOSSIL)
- machikii, Octopus machikii P. Brock, 1887 - (OCTOPODIDAE)
- machoi, Cubalaskeya machoi J. Espinosa, J.A. Ortea & L. Moro, 2008 - (CERITHIOPSIDAE)
- machoi, Zonitoides machoi G. Servain, 1880 - syn of: Zonitoides nitidus (O.F. Müller, 1774) - (GASTRODONTIDAE)
- machoi, Pfeiffericoptis machoi (R. Arango, 1876) - (UROCOPTIDAE)
- Machomya, Genus Machomya Loriol, 1868 † (PHOLADOMYOIDEA (UNASSIGNED)) (FOSSIL)
- Machrochilina, syn of: Genus Strobeus Whiteaves, 1892 † (SOLENISCIDAE) (FOSSIL)
- maciana, Alopia maciana A.S. Badarau & M. Szekeres, 2001 - (CLAUSILIIDAE)
- macies, Turbonilla macies C.R. Laws, 1937 † - (PYRAMIDELLIDAE) (FOSSIL)
- macilenta, Chrysallis antonii macilenta (P. Bartsch, 1932) - (BRADYBAENIDAE)
- macilenta, Laciniaria macilenta (E.A. Rossmässler, 1882) - (CLAUSILIIDAE)
- macilenta, Surcula macilenta J.C. Melvill, 1923 - syn of: Agladrillia macella (J.C. Melvill, 1923) - (CLAVATULIDAE)
- macilenta, Corbula macilenta F.W. Hutton, 1873 - syn of: Corbula zelandica J.R.C. Quoy & J.P. Gaimard, 1835 - (CORBULIDAE)
- macilenta, Pseudothurmannia macilenta (A.V.M.D. D'Orbigny, 1841 †) - (CRIOCERATITIDAE) (FOSSIL)
- macilenta, Drillia macilenta J.C. Melvill, 1923 - syn of: Agladrillia macella (J.C. Melvill, 1923) - (DRILLIIDAE)
- macilenta, Alcadia macilenta (C.B. Adams, 1849) - (HELICINIDAE)
- macilenta, Inkinga macilenta J.C. Melvill, 1923 - syn of: Inkinga platystoma (E.A. Smith, 1877) - (HORAICLAVIDAE)
- macilenta, Leiostyla recta macilenta R.T. Lowe, 1852 - (LAURIIDAE)
- macilenta, Melanopsis macilenta P.M. Pallary, 1928 - (MELANOPSIDAE)
- macilenta, Anisocycla macilenta T.A. de M. Monterosato, 1878 - syn of: Ebala striatula (J.G. Jeffreys, 1856) - (MURCHISONELLIDAE)
- macilenta, Euspira macilenta (R.A. Philippi, 1844) - (NATICIDAE)
- macilenta, Nuculana macilenta H.P.C. Møller, 1842 - syn of: Nuculana pernula (O.F. Müller, 1779) - (NUCULANIDAE)
- macilenta, Leptomaria macilenta Cragin, 1893 † - (PLEUROTOMARIIDAE) (FOSSIL)
- macilenta, Hindsiclava macilenta (W.H. Dall, 1889) - (PSEUDOMELATOMIDAE)
- macilenta, Turbonilla macilenta A. Adams, 1860 - (PYRAMIDELLIDAE)
- macilenta, Odostomia macilenta T.A. de M. Monterosato, 1878 - syn of: Ebala striatula (J.G. Jeffreys, 1856) - (PYRAMIDELLIDAE)
- macilenta, Charonia lampas macilenta J.T. Kuroda & T. Habe, 1961 - (RANELLIDAE)
- macilenta, Obtusella macilenta (T.A. de M. Monterosato, 1880) - (RISSOIDAE)
- macilenta, Moerella macilenta W.H. Dall, 1900 † - (TELLINIDAE) (FOSSIL)
- macilenta, Artemis macilenta L.A. Reeve, 1850 - syn of: Cyclinella subquadrata (S.C.T. Hanley, 1844) - (VENERIDAE)
- Macilentos, Subgenus Rimella (Macilentos) Clark & Palmer, 1923 † (RIMELLIDAE) (FOSSIL)
- macilentum, Prosopeas macilentum C.M.F. Ancey, 1903 - syn of: Prosopeas anceyi H.A. Pilsbry, 1906 - (SUBULINIDAE)
- macilentus, Procladiscites macilentus (J. Von Hauer, 1892 †) - (CLADISCITIDAE) (FOSSIL)
- macilentus, Nassarius macilentus (T.L. Casey, 1903 †) - (NASSARIIDAE) (FOSSIL)
- macilentus, Bukkenites macilentus Tozer, 1994 † - (PROPTYCHITIDAE) (FOSSIL)
- macilentus, Macilentos macilentus (White, 1889 †) - (RIMELLIDAE) (FOSSIL)
- macilentus, Hebetoxyites macilentus Buckman † - (STRIGOCERATIDAE) (FOSSIL)
- macilentus, Unio macilentus W.H. Benson, 1862 - syn of: Radiatula occata (I. Lea, 1860) - (UNIONIDAE)
- mackayensis, Graciliclava mackayensis T. Shuto, 1983 - syn of: Graciliclava costata (C. Hedley, 1922) - (HORAICLAVIDAE)
- mackayi, Aturia mackayi C.A. Fleming, 1945 † - (ATURIIDAE) (FOSSIL)
- mackayi, Mitrella mackayi (H.H. Suter, 1917 †) - (COLUMBELLIDAE) (FOSSIL)
- mackayi, Opalia mackayi P.A. Maxwell, 1992 † - (EPITONIIDAE) (FOSSIL)
- mackayi, Epitonium mackayi (J. Marwick, 1943 †) - (EPITONIIDAE) (FOSSIL)
- mackayi, Pycnodonte mackayi (H.H. Suter, 1917 †) - (GRYPHAEIDAE) (FOSSIL)
- mackayi, Polinices mackayi J. Marwick, 1931 † - (NATICIDAE) (FOSSIL)
- mackayi, Talantodiscus mackayi Begg & J. Grant-Mackie, 2003 † - (PLEUROTOMARIIDAE) (FOSSIL)
- mackayi, Actinopteria mackayi Fleming, 1957 † - (PTERINEIDAE) (FOSSIL)
- mackayi, Dosinia mackayi J. Marwick, 1927 † - (VENERIDAE) (FOSSIL)
- mackayi, Isorropodon mackayi P.G. Oliver & J. Drewery, 2014 - (VESICOMYIDAE)
- mackellari, Tropicolpus mackellari J. Marwick, 1971 † - (TURRITELLIDAE) (FOSSIL)
- mackenae, Liotella mackenae R.K. Dell, 1956 - (SKENEIDAE)
- mackensiana, Dyakia mackensiana (L.F.A. Souleyet, 1841) - (DYAKIIDAE)
- mackensii, Aegista mackensii (A. Adams & L.A. Reeve, 1832) - (BRADYBAENIDAE)
- mackenziei, Marama mackenziei J. Marwick, 1927 † - (VENERIDAE) (FOSSIL)
- Mackenziella, Genus Mackenziella Voronova & al., 1987 † (MOLLUSCA INCERTAE SEDIS) (FOSSIL)
- mackenzii, Hungarites mackenzii McLearn, 1948 † - syn of: Grambergia mackenzii (McLearn, 1948 †) - (CERATITIDAE) (FOSSIL)
- mackenzii, Juvavites mackenzii McLearn, 1937 † - syn of: Griesbachites humi McLearn, 1937 † - (JUVAVITIDAE) (FOSSIL)
- mackenzii, Grambergia mackenzii (McLearn, 1948 †) - (LONGOBARDITIDAE) (FOSSIL)
- mackerrowi, Pulvinites mackerrowi Palmer, 1984 † - (PULVINITIDAE) (FOSSIL)
- mackiana, Pholas mackiana C.J. Maury, 1912 † - (PHOLADIDAE) (FOSSIL)
- mackinlayi, Annularisca mackinlayi (J. Gundlach in L. Pfeiffer, 1859) - (POMATIIDAE)
- Mackinnonia, Genus Mackinnonia Bengtson & al., 1990 † (TRENELLIDAE) (FOSSIL)
- mackintoshi, Conus mackintoshi E.J. Petuch, 2013 - syn of: Conasprella mindana (C.H. Hwass in J.G. Bruguière, 1792) - (CONIDAE)
- mackintoshi, Fenimorea mackintoshi P.J. Fallon, 2016 - (DRILLIIDAE)
- mackintoshi, Crassispira mackintoshi P.J. Fallon, 2011 - (PSEUDOMELATOMIDAE)
- Macklintockia, syn of: Genus Cellana H. Adams, 1869 (NACELLIDAE)
- mackneyi, Prodichotomites mackneyi Alsen, 2006 † - (POLYPTYCHITIDAE) (FOSSIL)
- macknighti, Lissotesta macknighti (R.K. Dell, 1990) - (SEGUENZIOIDEA (UNASSIGNED))
- macknighti, Submargarita macknighti R.K. Dell, 1990 - syn of: Lissotesta macknighti (R.K. Dell, 1990) - (TURBINIDAE)
- mackrothi, Panopea mackrothi H.B. Geinitz, 1857 - (HIATELLIDAE)
- mackrothi, Pecten mackrothi K.C. Schauroth, 1854 † - syn of: Streblochondria sericea (de Verneuil, 1845 †) - (PECTINIDAE) (FOSSIL)
- maclaini, Oenopota maclaini (W.H. Dall, 1902) - (MANGELIIDAE)
- maclareni, Geisonoceras maclareni (Murchison, 1859 †) - (GEISONOCERATIDAE) (FOSSIL)
- maclayi, Vebericochlis maclayi Licharev, 1967 † - (MURCHISONIIDAE) (FOSSIL)
- maclayiana, Canefriula maclayiana (J.W. Brazier, 1886) - (CAMAENIDAE)
- macleani, Engina macleani A.A. Olsson, 1971 - (BUCCINIDAE)
- macleani, Prosipho macleani C. Hedley, 1916 - syn of: Prosipho mundus E.A. Smith, 1915 - (BUCCINIDAE)
- macleani, Cantrainea macleani A. Warén & P. Bouchet, 1993 - (COLLONIIDAE)
- macleani, Decipifus macleani A.M. Keen, 1971 - (COLUMBELLIDAE)
- macleani, Drillia macleani J.K. Tucker, 1992 - (DRILLIIDAE)
- macleani, Epitonium macleani H. DuShane, 1970 - (EPITONIIDAE)
- macleani, Eulimostraca macleani A. Warén, 1992 - (EULIMIDAE)
- macleani, Cadulus macleani W.K. Emerson, 1978 - (GADILIDAE)
- macleani, Ischnochiton macleani A. Ferreira, 1978 - (ISCHNOCHITONIDAE)
- macleani, Leptochiton macleani B.I. Sirenko, 2015 - (LEPTOCHITONIDAE)
- macleani, Limatula macleani Bernard, 1988 - syn of: Limatula saturna F.R. Bernard, 1978 - (LIMIDAE)
- macleani, Prunum macleani B. Roth, 1978 - (MARGINELLIDAE)
- macleani, Purpurellus macleani (W.K. Emerson & D'Attilio, 1969) - (MURICIDAE)
- macleani, Coralliophila macleani D.R. Shasky, 1970 - (MURICIDAE)
- macleani, Symmetromphalus macleani L.A. Beck, 1992 - (NEOMPHALIDAE)
- macleani, Simnia macleani (C.N. Cate, 1976) - (OVULIDAE)
- macleani, Eulithidium macleani (L.N. Marincovich, 1973) - (PHASIANELLIDAE)
- macleani, Tricolia macleani L.N. Marincovich, 1973 - syn of: Eulithidium macleani (L.N. Marincovich, 1973) - (PHASIANELLIDAE)
- macleani, Provanna macleani A. Warén & P. Bouchet, 1989 - (PROVANNIDAE)
- macleani, Sinezona macleani D.L. Geiger, 2006 - (SCISSURELLIDAE)
- macleani, Pristiterebra macleani (T. Bratcher, 1988) - (TEREBRIDAE)
- Macleaniella, Genus Macleaniella J.H. Leal & M.G. Harasewych, 1999 (COCCULINIDAE)
- macleari, Solariella macleari K.H. Barnard, 1963 - syn of: Solariella intermissa K.H.J. Thiele, 1925 - (SOLARIELLIDAE)
- maclearni, Neogastroplites maclearni Reeside & Cobban, 1960 † - (HOPLITIDAE) (FOSSIL)
- maclearni, Columbisculites maclearni Tozer, 1994 † - (ISCULITIDAE) (FOSSIL)
- maclearni, Anapetopsis maclearni Peel, 1975 † - (KNIGHTITIDAE) (FOSSIL)
- maclearni, Nathorstites maclearni Tozer, 1994 † - (NATHORSTITIDAE) (FOSSIL)
- maclearni, Brouwerites maclearni Tozer, 1994 † - (STEINMANNITIDAE) (FOSSIL)
- maclearni, Idaoceras maclearni Tozer, 1994 † - (THETIDITIDAE) (FOSSIL)
- maclearni, Maclearnoceras maclearni Tozer, 1963 † - (TRACHYCERATIDAE) (FOSSIL)
- maclearni, Anatropites maclearni Tozer, 1994 † - (TROPITIDAE) (FOSSIL)
- Maclearnia, Subgenus Camptonectes (Maclearnia) Milova, 1985 † (PECTINIDAE) (FOSSIL)
- Maclearnoceras, Genus Maclearnoceras Tozer , 1963 † (TRACHYCERATIDAE) (FOSSIL)
- macleay, Oliva vidua macleay P.L. Duclos, 1840 - (OLIVIDAE)
- macleaya, Oliva macleaya P.L. Duclos, 1835 - syn of: Oliva vidua (P.F. Röding, 1798) - (OLIVIDAE)
- macleayana, Conus macleayana J.E. Tenison-Woods, 1877 - syn of: Conasprella rutila (K.T. Menke, 1843) - (CONIDAE)
- macleayana, Turbonilla macleayana J.E. Tenison-Woods, 1876 - (PYRAMIDELLIDAE)
- macleayana, Venus macleayana J.E. Tenison-Woods, 1878 - syn of: Austrovenus stutchburyi (W. Wood, 1828) - (VENERIDAE)
- macleayi, Baeolidia macleayi (G.F. Angas, 1864) - (AEOLIDIIDAE)
- macleayi, Spurilla macleayi (G.F. Angas, 1864) - syn of: Baeolidia macleayi (G.F. Angas, 1864) - (AEOLIDIIDAE)
- macleayi, Bentosites macleayi (J.C. Cox, 1865) - (CAMAENIDAE)
- macleayi, Clathurella macleayi J.W. Brazier, 1876 - syn of: Iredalea macleayi (J.W. Brazier, 1876) - (CLATHURELLIDAE)
- macleayi, Ditropisena macleayi (J.W. Brazier, 1877) - (CYCLOPHORIDAE)
- macleayi, Iredalea macleayi (J.W. Brazier, 1876) - (DRILLIIDAE)
- macleayi, Amimopina macleayi (J.W. Brazier, 1876) - (ENIDAE)
- macleayi, Pleuropoma macleayi (J.W. Brazier, 1876) - (HELICINIDAE)
- macleayi, Hedleya macleayi J.C. Cox, 1892 - (PUPINIDAE)
- Macleayropa, Genus Macleayropa Stanisic, 2010 (CHAROPIDAE)
- maclintocki, Pseudolioceras maclintocki S.H. Haughton, 1858 † - (HILDOCERATIDAE) (FOSSIL)
- macloskeyi, Nodipecten macloskeyi Anderson, 1929 † - (PECTINIDAE) (FOSSIL)
- maclurae, Orthalicus maclurae E.C. Von Martens, 1893 - (ORTHALICIDAE)
- maclurae turrita, Zebra maclurae turrita H. Strebel, 1909 - syn of: Orthalicus maclurae E.C. Von Martens, 1893 - (ORTHALICIDAE)
- Maclurea, syn of: Genus Maclurites Le Sueur, 1818 † (MACLURITIDAE) (FOSSIL)
- maclurgi, Alvania maclurgi (A.W.B. Powell, 1933) - (RISSOIDAE)
- maclurii, Ranellina maclurii Lea, 1833 † - syn of: Ranellina sulcata (Lea, 1833 †) - (BURSIDAE) (FOSSIL)
- Maclurina, Genus Maclurina Ulrich & Scofield, 1897 † (MACLURITIDAE) (FOSSIL)
- Macluritella, Genus Macluritella Kirk, 1927 † (MACLURITIDAE) (FOSSIL)
- Maclurites, Genus Maclurites Le Sueur, 1818 † (MACLURITIDAE) (FOSSIL)
- MACLURITIDAE Carpenter, 1861 † - Family (GASTROPODA-EOGASTROPODA [Subclass]-EUOMPHALINA [Order]-MACLURITOIDEA [Superfamily]) (FOSSIL)
- macmichaeli, Elliptio macmichaeli W.J. Clench & H. Turner, 1956 - (UNIONIDAE)
- Macmillanorbis, Subgenus Triodopsis (Macmillanorbis) Emberton, 1995 (POLYGYRIDAE)
- macmurayi, Zaphysema macmurayi (C.B. Adams, 1849) - (SAGDIDAE)
- macmurdensis, Austrodoris macmurdensis N.H. Odhner, 1934 - syn of: Doris kerguelenensis (L.S.R. Bergh, 1884) - (DORIDIDAE)
- macmurdensis, Lacuna macmurdensis C. Hedley, 1911 - syn of: Trilirata macmurdensis (C. Hedley, 1911) - (LITTORINIDAE)
- macmurdensis, Fossarus macmurdensis (C. Hedley, 1911) - (PLANAXIDAE)
- macmurdensis, Trilirata macmurdensis (C. Hedley, 1911) - (ZEROTULIDAE)
- macmurrayi, Latirus macmurrayi W.J. Clench & C.G. Aguayo, 1941 - syn of: Bullockus mcmurrayi (W.J. Clench & C.G. Aguayo, 1941) - (FASCIOLARIIDAE)
- macmurrayi, Alcadia macmurrayi (L. Pfeiffer, 1867) - (HELICINIDAE)
- macmurrayi, Zaphysema macmurrayi (C.B. Adams, 1849) - (SAGDIDAE)
- macnabiana, Helix macnabiana L.A. Reeve, 1854 - syn of: Aerotrochus mcnabianus (E. Chitty, 1853) - (HELICIDAE)
- macnabianus, Planorbis macnabianus C.B. Adams, 1849 - syn of: Drepanotrema cimex (S. Moricand, 1839) - (PLANORBIDAE)
- macnaei, Elysia macnaei Ev. Marcus, 1982 - syn of: Elysia pusilla (L.S.R. Bergh, 1871) - (PLAKOBRANCHIDAE)
- macnairi, Dentimargo macnairi (A.R.J.B. Bavay, 1922) - (MARGINELLIDAE)
- macnairi, Neogeoceras macnairi Nassichuk & al., 1965 † - (MEDLICOTTIIDAE) (FOSSIL)
- macnairyensis, Fusulculus macnairyensis (B. Wade, 1917 †) - (BENTHOBIIDAE) (FOSSIL)
- macnairyensis, Cancellaria macnairyensis N.F. Sohl, 1964 † - (CANCELLARIIDAE) (FOSSIL)
- macnairyensis, Cryptoconus macnairyensis B. Wade, 1917 † - (CONIDAE) (FOSSIL)
- macnairyensis, Conorbis macnairyensis B. Wade, 1917 † - syn of: Fusulculus macnairyensis (B. Wade, 1917 †) - (CONORBIDAE) (FOSSIL)
- macnairyensis, Fusinus macnairyensis B. Wade, 1926 † - (FASCIOLARIIDAE) (FOSSIL)
- macnairyensis, Amuletum macnairyensis B. Wade, 1926 † - (TURRIDAE) (FOSSIL)
- macnairyensis torquatum, Amuletum macnairyensis torquatum N.F. Sohl, 1964 † - (TURRIDAE) (FOSSIL)
- macnaughti, Scaphogonia macnaughti Fleming, 1987 † - (MYOPHORELLIDAE) (FOSSIL)
- macneili, Pyruclia macneili W.C. Mansfield, 1937 † - (CANCELLARIIDAE) (FOSSIL)
- macneili, Conus macneili Kanno, O'hara & Caagusan, 1982 † - (CONIDAE) (FOSSIL)
- macneili, Persicula macneili E.J. Petuch, 1997 † - syn of: Prunum macneili (E.J. Petuch, 1997 †) - (CYSTISCIDAE) (FOSSIL)
- macneili, Prunum macneili (E.J. Petuch, 1997 †) - (MARGINELLIDAE) (FOSSIL)
- macneili, Panamurex macneili E.H. Vokes, 1970 † - (MURICIDAE) (FOSSIL)
- macneili, Averellia macneili (J.C.H. Crosse, 1873) - (XANTHONYCHIDAE)
- macneilii, Tellina macneilii W.H. Dall, 1900 - syn of: Ameritella felix (S.C.T. Hanley, 1844) - (TELLINIDAE)
- macneilli, Sphaerospira macneilli (T. Iredale, 1937) - (CAMAENIDAE)
- macneilli, Anguispira macneilli B. Walker, 1928 - (DISCIDAE)
- macneilli, Pupisoma macneilli W.F. Clapp, 1918 - (VERTIGINIDAE)
- macneillii, Corbulomima macneillii (Morris) † - (CORBULIDAE) (FOSSIL)
- macnielii, Nephronaias macnielii (I. Lea, 1869) - (UNIONIDAE)
- macoma, Planktomya macoma (Nordsieck, 1972 †) - (MONTACUTIDAE) (FOSSIL)
- Macoma, Genus Macoma W.E. Leach, 1819 (TELLINIDAE)
- Macomangulus, syn of: Genus Tellina C. Linnaeus, 1758 (TELLINIDAE)
- macombi, Prionocyclus macombi F.B. Meek, 1876 † - (COLLIGNONICERATIDAE) (FOSSIL)
- macomoides, Heteroschizodus macomoides Newell & Boyd, 1975 † - (SCHIZODIDAE) (FOSSIL)
- Macomona, Subgenus Arcopagia (Macomona) H.J. Finlay, 1926 (TELLINIDAE)
- Macomopsis, Genus Macomopsis Sacco, 1901 (TELLINIDAE)
- maconelli, Hedleyella maconelli (L.A. Reeve, 1883) - (CARYODIDAE)
- maconensis, Pachydiscus maconensis Cobban & Kennedy, 1995 † - (DESMOCERATIDAE) (FOSSIL)
- maconensis, Unio maconensis I. Lea, 1857 - syn of: Elliptio pullata (I. Lea, 1856) - (UNIONIDAE)
- Maconiceras, syn of: Genus Harpoceras Sowerby, 1820 † (HILDOCERATIDAE) (FOSSIL)
- Macoploma, Subgenus Macoma (Macoploma) Pilsbry & Olsson, 1941 † (TELLINIDAE) (FOSSIL)
- Macoploma, syn of: Genus Macoma W.E. Leach, 1819 (TELLINIDAE)
- macostata, Anomia macostata M. Huber, 2010 - (ANOMIIDAE)
- macouni, Boreotrophon macouni W.H. Dall & P. Bartsch, 1910 - (MURICIDAE)
- macouni, Turbonilla macouni W.H. Dall & P. Bartsch, 1910 - (PYRAMIDELLIDAE)
- macoveii, Eupachydiscus macoveii Szász, 1981 † - (PACHYDISCIDAE) (FOSSIL)
- macphersonae, Phyllodesmium macphersonae (R.F. Burn, 1962) - (FACELINIDAE)
- macphersonae, Laevilitorina macphersonae (R.K. Dell, 1964) - (LITTORINIDAE)
- macphersonae, Mitromorpha macphersonae (C.J. Gabriel, 1956) - (MITROMORPHIDAE)
- Macphersonea, Genus Macphersonea Shea, Colgan & Stanisic, 2012 (CHAROPIDAE)
- macphersoni, Paracominia macphersoni (J. Marwick, 1931 †) - (BUCCINIDAE) (FOSSIL)
- macphersoni, Hoplites macphersoni Kilian, 1889 † - syn of: Lopeziceras chaperi (Pictet, 1868 †) - (HOPLITIDAE) (FOSSIL)
- macphersoni, Periploma macphersoni J. Marwick, 1931 † - (PERIPLOMATIDAE) (FOSSIL)
- macphersoni, Pyrgiscus macphersoni (J. Marwick, 1931 †) - (PYRAMIDELLIDAE) (FOSSIL)
- Macquariella, Genus Macquariella H.J. Finlay, 1926 (LITTORINIDAE)
- macquariensis, Margarella macquariensis C. Hedley, 1916 - (CALLIOSTOMATIDAE)
- macquariensis, Kidderia macquariensis C. Hedley, 1916 - syn of: Kidderia oblonga (E.A. Smith, 1898) - (CYAMIIDAE)
- macquariensis, Cuthona macquariensis (R.F. Burn, 1973) - (FIONIDAE)
- macquariensis, Actinoleuca campbelli macquariensis (C. Hedley, 1916) - (LOTTIIDAE)
- macquariensis, Mysella macquariensis C. Hedley, 1916 - (MONTACUTIDAE)
- macquariensis, Enixotrophon macquariensis (A.W.B. Powell, 1957) - (MURICIDAE)
- macquariensis, Nacella macquariensis (H.J. Finlay, 1926) - (NACELLIDAE)
- macquariensis, Eumetula macquariensis J.R. le B. Tomlin, 1948 - (NEWTONIELLIDAE)
- macquariensis, Gyraulus macquariensis E.A. Smith, 1882 - (PLANORBIDAE)
- macquariensis, Montidelos macquariensis (J.C. Cox, 1872) - (RHYTIDIDAE)
- macquariensis, Kerguelenella lateralis macquariensis (A.W.B. Powell, 1939) - (SIPHONARIIDAE)
- macqueeni, Pseudomitchellia macqueeni Frýda & al., 2002 † - (SCOLIOSTOMATIDAE) (FOSSIL)
- macra, Vitreolina macra (P. Bartsch, 1917) - (EULIMIDAE)
- macra, Melanella macra P. Bartsch, 1917 - syn of: Vitreolina macra (P. Bartsch, 1917) - (EULIMIDAE)
- macra, Benthomangelia macra (R.B. Watson, 1881) - (MANGELIIDAE)
- macra, Urosalpinx macra A.E. Verrill, 1884 - (MURICIDAE)
- macra, Amauropsis macra Böhm, 1895 † - (NATICIDAE) (FOSSIL)
- macra, Periploma macra L. Krishtofovich, 1984 † - syn of: Periploma circularis L. Krishtofovich, 1984 † - (PERIPLOMATIDAE) (FOSSIL)
- macra, Tetranota macra Ulrich & Scofield, 1897 † - (PLECTONOTIDAE) (FOSSIL)
- macra, Pseudozygopleura macra Knight, 1930 † - (PSEUDOZYGOPLEURIDAE) (FOSSIL)
- macra, Turbonilla macra W.H. Dall & P. Bartsch, 1909 - (PYRAMIDELLIDAE)
- macra, Onoba macra (R.B. Watson, 1886) - (RISSOIDAE)
- macra, Opeas nutans macra (P.V. Gredler, 1887) - (SUBULINIDAE)
- macra, Pleurotoma macra R.B. Watson, 1881 - syn of: Benthomangelia macra (R.B. Watson, 1881) - (TURRIDAE)
- macra, Polystira macra P. Bartsch, 1934 - syn of: Polystira jelskii (J.C.H. Crosse, 1865) - (TURRIDAE)
- macra, Poecilocoptis macra (B.H. Wright in L. Pfeiffer, 1867) - (UROCOPTIDAE)
- macra ionica, Benthomangelia macra ionica F. Nordsieck, 1977 - (MANGELIIDAE)
- macracanthos, Falcidens macracanthos A.H. Scheltema, 1998 - (CHAETODERMATIDAE)
- macrafrondis, Falcidens macrafrondis A.H. Scheltema, 1989 - (CHAETODERMATIDAE)
- macranaevis, Andraea macranaevis J.R. Bourguignat, 1877 - syn of: Andraea dubia J.P.R. Draparnaud, 1805 - (CLAUSILIIDAE)
- macrapex, Bathycrinicola macrapex P. Bouchet & A. Warén, 1986 - (EULIMIDAE)
- macrapex, Lusitanops macrapex P. Bouchet & A. Warén, 1980 - (RAPHITOMIDAE)
- Macrarene, Genus Macrarene L.G. Hertlein & A. Strong, 1951 (LIOTIIDAE)
- macrasolvia, Aegopinella macrasolvia J.R. Bourguignat, 1894 - syn of: Aegopinella pura (J. Alder, 1830) - (ZONITIDAE)
- Macrassiminea, Subgenus Assiminea (Macrassiminea) K.H.J. Thiele, 1927 (ASSIMINEIDAE)
- Macrenoica, syn of: Genus Phaedusa H. Adams & A. Adams, 1855 (CLAUSILIIDAE)
- macrescens, Morphoceras macrescens (Buckman, 1923 †) - (MORPHOCERATIDAE) (FOSSIL)
- macri, Theodoxus macri (G.B. Sowerby, 1849) - (NERITIDAE)
- Macridiscus, Genus Macridiscus W.H. Dall, 1902 (VENERIDAE)
- macrina, Murdochella macrina T. Iredale, 1936 - (NYSTIELLIDAE)
- macrior, Coluzea macrior Finlay, 1930 † - (TURBINELLIDAE) (FOSSIL)
- macro, Stolidotus macro Kriz 2005 † - (STOLIDOTIDAE) (FOSSIL)
- Macroarion, syn of: Genus Arion A.E.J. Férussac, 1819 (ARIONIDAE)
- macroberstoni, Leucosyrinx macroberstoni A.W.B. Powell, 1958 - syn of: Leucosyrinx macrobertsoni A.W.B. Powell, 1958 - (PSEUDOMELATOMIDAE)
- macrobertsoni, Leucosyrinx macrobertsoni A.W.B. Powell, 1958 - (PSEUDOMELATOMIDAE)
- macrobiotus, Retinelloides macrobiotus G. Nevill - syn of: Retinelloides incerta (J.P.R. Draparnaud, 1805) - (ZONITIDAE)
- macrobranchia, Cratena macrobranchia (J.C. van Hasselt, 1824) - (FACELINIDAE)
- Macrocallista, Subgenus Callista (Macrocallista) F.B. Meek, 1876 (VENERIDAE)
- macrocarinata, Atlanta macrocarinata K.E.H. Bonnevie, 1920 - syn of: Atlanta inclinata J.E. Gray, 1850 - (ATLANTIDAE)
- macrocentrus, Conus macrocentrus Bayan, 1873 † - (CONIDAE) (FOSSIL)
- macrocephala, Xanthomelon pachystylum macrocephala (L. Pfeiffer, 1845) - (CAMAENIDAE)
- macrocephala, Horologica macrocephala C.F. Laseron, 1956 - (CERITHIOPSIDAE)
- macrocephala, Leiocithara macrocephala (K.H.J. Thiele, 1925) - (MANGELIIDAE)
- macrocephala, Septaria macrocephala E.J. Le Guillou, 1841 - (NERITIDAE)
- macrocephala, Cerithiella macrocephala P. Dautzenberg & H. Fischer, 1897 - syn of: Cerithiella metula (S.L. Lovén, 1846) - (NEWTONIELLIDAE)
- macrocephala, Syrnola macrocephala C. Hedley, 1903 - (PYRAMIDELLIDAE)
- macrocephala, Hortia macrocephala Y.I. Kantor, P. Lozouet, N. Puillandre & P. Bouchet, 2014 - (PYRAMIMITRIDAE)
- macrocephala, Kuphus macrocephala (E.J. Le Guillou in C.A. Récluz, 1841) - (TEREDINIDAE)
- macrocephali, Spiniloma macrocephali (F.A. von Quenstedt, 1884 †) - (SPINILOMATIDAE) (FOSSIL)
- macrocephali, Muricida macrocephali F.A. von Quenstedt, 1884 † - syn of: Spiniloma macrocephali (F.A. von Quenstedt, 1884 †) - (SPINILOMATIDAE) (FOSSIL)
- Macrocephalites, Genus Macrocephalites Zittel, 1884 † (MACROCEPHALITIDAE) (FOSSIL)
- MACROCEPHALITIDAE Buckmann, 1922 † - Family (CEPHALOPODA-AMMONOIDEA [Subclass]-AMMONITIDA [Order]-STEPHANOCERATOIDEA [Superfamily]) (FOSSIL)
- macrocephalus, Macrocephalites macrocephalus (non Schlotheim) † - (MACROCEPHALITIDAE) (FOSSIL)
- macrocephalus, Macrocephalites macrocephalus (Schlotheim †) - (MACROCEPHALITIDAE) (FOSSIL)
- macrocephalus, Babelomurex macrocephalus M. Oliverio, 2008 - (MURICIDAE)
- macrocephalus, Nassarius macrocephalus (M.M. Schepman, 1911) - (NASSARIIDAE)
- macrocephalus, Pyrgotrochus macrocephalus (F.A. von Quenstedt, 1858 †) - (PLEUROTOMARIIDAE) (FOSSIL)
- macrocephalus, Subanarcestes macrocephalus Schindewolf, 1933 † - (SOBOLEWIIDAE) (FOSSIL)
- macrocephalus greyanus, Zeuxis macrocephalus greyanus T. Shuto, 1969 † - syn of: Tritia sinusigera (A. Adams, 1852) - (NASSARIIDAE) (FOSSIL)
- Macroceramus, Genus Macroceramus L. Guilding, 1828 (UROCOPTIDAE)
- Macroceras, Genus Macroceras J.O. Semper, 1870 (EUCONULIDAE)
- macrochaeta, Cephalobrachia macrochaeta (K.E.H. Bonnevie, 1913) - (CLIONIDAE)
- Macrochasma, syn of: Genus Megathura H.A. Pilsbry, 1890 (FISSURELLIDAE)
- macrocheila, Megalotachea macrocheila (A.E. Reuss in A.E. Reuss & Meyer, 1849 †) - (HELICIDAE) (FOSSIL)
- Macrocheilina, syn of: Genus Strobeus Whiteaves, 1892 † (SOLENISCIDAE) (FOSSIL)
- Macrocheilos, syn of: Subgenus Soleniscus (Macrochilina) Bayle, 1880 † (SOLENISCIDAE) (FOSSIL)
- Macrocheilus, syn of: Subgenus Soleniscus (Macrochilina) Bayle, 1880 † (SOLENISCIDAE) (FOSSIL)
- macrocheir, Idiosepius macrocheir N.A. Voss, 1962 - (IDIOSEPIIDAE)
- macrocheiricola, Delectopecten macrocheiricola (T. Habe, 1951) - (PECTINIDAE)
- macrochiensis, Natica macrochiensis J.F. Gmelin, 1791 - (NATICIDAE)
- macrochila, Chondrina macrochila A. Bofill, 1917 - syn of: Chondrina tenuimarginata C. des Moulins, 1835 - (CHONDRINIDAE)
- Macrochilina, Subgenus Soleniscus (Macrochilina) Bayle, 1880 † (SOLENISCIDAE) (FOSSIL)
- macrochilus, Chondrina macrochilus A. Bofill, 1909 - syn of: Chondrina tenuimarginata C. des Moulins, 1835 - (CHONDRINIDAE)
- Macrochilus, syn of: Subgenus Soleniscus (Macrochilina) Bayle, 1880 † (SOLENISCIDAE) (FOSSIL)
- macrochira, Pneumodermopsis macrochira (J. Meisenheimer, 1905) - (PNEUMODERMATIDAE)
- macrochira, Pneumoderma macrochira J. Meisenheimer, 1905 - syn of: Pneumodermopsis macrochira (J. Meisenheimer, 1905) - (PNEUMODERMATIDAE)
- macrochisma, Pododesmus macrochisma (G.P. Deshayes, 1839) - (ANOMIIDAE)
- Macrochisma, syn of: Genus Macroschisma J.E. Gray, 1835 (FISSURELLIDAE)
- macrochisma, Galeomma macrochisma G.P. Deshayes, 1856 - (GALEOMMATIDAE)
- macrochisma cepio, Pododesmus macrochisma cepio J.E. Gray, 1850 - (ANOMIIDAE)
- macrochisma ezoanus, Pododesmus macrochisma ezoanus K. Kanehara, 1942 - syn of: Pododesmus macrochisma (G.P. Deshayes, 1839) - (ANOMIIDAE)
- Macrochlaena, Genus Macrochlaena G.C. Robson, 1929 (OCTOPODIDAE)
- Macrochlamis, Genus Macrochlamis Sacco, 1897 † (PECTINIDAE) (FOSSIL)
- Macrochlamys, Genus Macrochlamys W.H. Benson, 1832 in J.E. Gray, 1847 (ARIOPHANTIDAE)
- Macroclanculus, syn of: Genus Clanculus P.D. Montfort, 1810 (TROCHIDAE)
- macroconica, Ophileta macroconica Billings, 1865 † - syn of: Ceratopea canadensis (Billings, 1865 †) - (OPHILETIDAE) (FOSSIL)
- macroconica, Ceratopea macroconica Flower, 1968 † - syn of: Ceratopea canadensis (Billings, 1865 †) - (RAPHISTOMATIDAE) (FOSSIL)
- macroconspicua, Parvedentulina macroconspicua K.C. Emberton, 2002 - (STREPTAXIDAE)
- macrocotyla, Pneumodermopsis macrocotyla S.P. Zhang, 1964 - (PNEUMODERMATIDAE)
- macrocotylum, Pneumodermon macrocotylum J.E.V. Boas, 1886 - syn of: Pneumoderma mediterraneum P.J. Van Beneden, 1838 - (PNEUMODERMATIDAE)
- Macroctopus, Genus Macroctopus G.C. Robson, 1928 (OCTOPODIDAE)
- MACROCYCLIDAE Thiele, 1926 - Family (GASTROPODA-HETEROBRANCHIA [Subclass]-PULMONATA [Infraclass]-STYLOMMATOPHORA [Order]-ACAVOIDEA [Superfamily])
- Macrocyclis, Genus Macrocyclis H.H. Beck, 1837 (MACROCYCLIDAE)
- macrocycloides, Trishoplita macrocycloides (W. Kobelt, 1879) - (BRADYBAENIDAE)
- Macrocycloides, Genus Macrocycloides E.C. Von Martens, 1867 (RHYTIDIDAE)
- Macrocypraea, Genus Macrocypraea F.A. Schilder, 1930 (CYPRAEIDAE)
- macrocystialis, Acanthochitona macrocystialis E.A. Ashby, 1924 - (ACANTHOCHITONIDAE)
- macrodactyla, Solemya macrodactyla A. de Rochebrune & J.F. Mabille, 1889 - syn of: Acharax patagonica (E.A. Smith, 1885) - (SOLEMYIDAE)
- macrodactylus, Scintilla macrodactylus C.F. Lützen & C. Nielsen, 2005 - (GALEOMMATIDAE)
- Macrodelos, Genus Macrodelos J. Stanisic, 2010 (RHYTIDIDAE)
- macrodenticulata, Runcina macrodenticulata J.C. García-Gómez & Lopez la Cuadra, 1990 - (RUNCINIDAE)
- macrodenticulata, Kruppomenia macrodenticulata E. Gil-Mansilla, Ó. García-Álvarez & V. Urgorri, 2012 - (SIMROTHIELLIDAE)
- macrodera, Albinaria hians macrodera (O. Böttger, 1885) - (CLAUSILIIDAE)
- macroderma, Grammysia macroderma d'Eichwald, 1856 † - syn of: Pterotheca macroderma (d'Eichwald, 1856 †) - (GRAMMYSIIDAE) (FOSSIL)
- macroderma, Pterotheca macroderma (d'Eichwald, 1856 †) - (PTEROTHECIDAE) (FOSSIL)
- Macrodesma, Genus Macrodesma Isberg, 1934 † (CYRTODONTIDAE) (FOSSIL)
- Macrodiceras, Genus Macrodiceras Karczewski , 1969 † (LASAEIDAE) (FOSSIL)
- Macrodomoceras, Genus Macrodomoceras Teichert & Glenister, 1952 † (POLYELASMOCERATIDAE) (FOSSIL)
- macrodon, Partulina macrodon F. Borcherding, 1901 - syn of: Partulina dwightii mucida macrodon (F. Borcherding, 1901) - (ACHATINELLIDAE)
- macrodon, Cerion macrodon C.G. Aguayo & M.L. Jaume, 1951 - (CERIONIDAE)
- macrodon, Indoennea macrodon W.T. Blanford - (DIAPHERIDAE)
- macrodon, Gastrocopta macrodon H.A. Pilsbry, 1917 - (GASTROCOPTIDAE)
- macrodon, Hiatella macrodon R.A. Philippi, 1851 - syn of: Hiatella arctica (C. Linnaeus, 1767) - (HIATELLIDAE)
- macrodon, Mesodesma macrodon L.A. Reeve, 1854 - syn of: Atactodea striata (J.F. Gmelin, 1791) - (MESODESMATIDAE)
- macrodon, Nassarius macrodon (H.G. Bronn, 1831 †) - (NASSARIIDAE) (FOSSIL)
- macrodon, Cypraedia macrodon L. Dolin & J.M. Pacaud, 2009 † - (OVULIDAE) (FOSSIL)
- Macrodon, syn of: Genus Parallelodon Meek & Worthen, 1866 † (PARALLELODONTIDAE) (FOSSIL)
- macrodon, Monoplex macrodon A. Valenciennes, 1832 - (RANELLIDAE)
- macrodon, Truncilla macrodon I. Lea, 1859 - (UNIONIDAE)
- macrodon recidivus, Nassarius macrodon recidivus E.C. Von Martens, 1876 - syn of: Nassarius recidivus (E.C. Von Martens, 1876) - (NASSARIIDAE)
- Macrodonax, Genus Macrodonax Olsson, 1944 † (CARDIIDA (UNASSIGNED)) (FOSSIL)
- macrodonta, Agardhiella macrodonta (P. Hesse, 1916) - (ARGNIDAE)
- macrodonta, Syndosmya macrodonta (G.P. Deshayes, 1857 †) - (SEMELIDAE) (FOSSIL)
- macrodonta rumelica, Agardhiella macrodonta rumelica (P. Hesse, 1916) - (ARGNIDAE)
- Macrodontella, Genus Macrodontella Assmann, 1916 † (ARCIDA (UNASSIGNED)) (FOSSIL)
- Macrodontes, syn of: Genus Odontostomus H.H. Beck, 1837 (ODONTOSTOMIDAE)
- Macrodontopsis, Subgenus Odontostomus (Macrodontopsis) K.H.J. Thiele, 1931 (ODONTOSTOMIDAE)
- macrodoryata, Kruppomenia macrodoryata C. Todt & L. Salvini-Plawén, 2003 - (SIMROTHIELLIDAE)
- Macrodostomia, Subgenus Odostomia (Macrodostomia) F. Sacco, 1892 (PYRAMIDELLIDAE)
- macroflagelata, Lehmannia macroflagelata A.V. Grossu & D. Lupu, 1962 - syn of: Lehmannia macroflagellata A.V. Grossu & D. Lupu, 1962 - (LIMACIDAE)
- macroflagellata, Lehmannia macroflagellata A.V. Grossu & D. Lupu, 1962 - (LIMACIDAE)
- Macrogammites, syn of: Genus Macrogrammites Buckman, 1928 † (SCHLOTHEIMIIDAE) (FOSSIL)
- Macrogastra, Genus Macrogastra J.D.W. Hartmann, 1841 (CLAUSILIIDAE)
- macrogira, Gibbulinella macrogira (A. Mousson, 1872) - (STREPTAXIDAE)
- Macrogonaxis, Subgenus Tayloria (Macrogonaxis) K.H.J. Thiele, 1932 (STREPTAXIDAE)
- Macrogrammites, Genus Macrogrammites Buckman, 1928 † (SCHLOTHEIMIIDAE) (FOSSIL)
- Macroheynemannia, syn of: Genus Limax C. Linnaeus, 1758 (LIMACIDAE)
- macrohista, Histioteuthis macrohista N.A. Voss, 1969 - (HISTIOTEUTHIDAE)
- macrolineata, Oriostoma macrolineata R.P. Whitfield, 1878 † - syn of: Oriostoma globosum sculptum (Sowerby & Murchison, 1839 †) - (ORIOSTOMATIDAE) (FOSSIL)
- macrolineatus, Poleumita macrolineatus von Schlotheim, 1820 † - syn of: Oriostoma globosum (von Schlotheim, 1820 †) - (EUOMPHALIDAE) (FOSSIL)
- Macroloxoceras, Genus Macroloxoceras Flower, 1957 † (PSEUDORTHOCERATIDAE) (FOSSIL)
- Macroma, syn of: Genus Macoma W.E. Leach, 1819 (TELLINIDAE)
- Macromaizaniella, Subgenus Maizaniella (Macromaizaniella) van Bruggen, 1982 (MAIZANIIDAE)
- Macromangulus, Genus Macromangulus Nordsieck, 1969 (TELLINIDAE)
- Macromargarya, Genus Macromargarya Ying, Fürsich & Schneider, 2013 † (VIVIPARIDAE) (FOSSIL)
- macrometrica, Horologica macrometrica C.F. Laseron, 1956 - (CERITHIOPSIDAE)
- macromphala, Tornatellides macromphala (C.M.F. Ancey, 1903) - (ACHATINELLIDAE)
- macromphala, Coenocharopa macromphala J. Stanisic, 1990 - (CHAROPIDAE)
- macromphala, Endothyrella macromphala (W.T. Blanford, 1870) - (PLECTOPYLIDAE)
- macromphala, Ashmunella macromphala J. Vagvolgyi, 1974 - (POLYGYRIDAE)
- macromphala ada, Tornatellides macromphala ada H.A. Pilsbry & C.M. Cooke, 1915 - (ACHATINELLIDAE)
- Macromphalina, Genus Macromphalina A.E.M. Cossmann, 1888 (VANIKORIDAE)
- macromphalum, Epitonium macromphalum E.A. Smith, 1910 - syn of: Epitonium macromphalus (E.A. Smith, 1910) - (EPITONIIDAE)
- macromphalus, Bellerophon macromphalus A. Römer, 1843 † - (BELLEROPHONTIDAE) (FOSSIL)
- macromphalus, Epitonium macromphalus (E.A. Smith, 1910) - (EPITONIIDAE)
- macromphalus, Straparollus macromphalus Winchell, 1863 † - (EUOMPHALIDAE) (FOSSIL)
- macromphalus, Nautilus macromphalus Sowerby, 1849 - (NAUTILIDAE)
- macromphalus, Ecculiomphalus macromphalus F. McCoy, 1851 † - (OPHILETIDAE) (FOSSIL)
- Macromphalus, Genus Macromphalus S.V. Wood, 1842 (VANIKORIDAE)
- macromya, Sportella macromya (G.P. Deshayes, 1857 †) - (SPORTELLIDAE) (FOSSIL)
- MACROMYIDAE - syn of Family: MACTROMYIDAE (FOSSIL)
- Macron, Genus Macron H. Adams & A. Adams, 1853 (PSEUDOLIVIDAE)
- macronata, Zafrona macronata L.R.L. Simone, 2009 - (COLUMBELLIDAE)
- Macroniscus, syn of: Genus Macron H. Adams & A. Adams, 1853 (PSEUDOLIVIDAE)
- Macropalaina, Subgenus Palaina (Macropalaina) O.F. von Möllendorff, 1897 (DIPLOMMATINIDAE)
- Macropalaina, syn of: Genus Palaina J.O. Semper, 1865 (DIPLOMMATINIDAE)
- macrope, Cirroteuthis macrope S.S. Berry, 1911 - syn of: Vampyroteuthis infernalis C. Chun, 1903 - (CIRROTEUTHIDAE)
- Macropelmus, syn of: Genus Astraea P.F. Röding, 1798 (TURBINIDAE)
- Macrophaedusa, Genus Macrophaedusa O.F. von Möllendorff, 1883 (CLAUSILIIDAE)
- Macrophaedusella, Genus Macrophaedusella H. Nordsieck, 2001 (CLAUSILIIDAE)
- Macrophagma, syn of: Genus Petaloconchus H.C. Lea, 1843 (VERMETIDAE)
- Macrophallikoropa, Genus Macrophallikoropa Hyman & Stanisic, 2005 (CHAROPIDAE)
- macrophallus, Muusoctopus macrophallus N.A. Voss & W.G. Pearcy, 1990 - syn of: Muusoctopus yaquinae (N.A. Voss & W.G. Pearcy, 1990) - (ENTEROCTOPODIDAE)
- macrophallus, Sonorella macrophallus H.L. Fairbanks & D.M. Reeder, 1980 - (HELMINTHOGLYPTIDAE)
- macrophalus, Muusoctopus macrophalus N.A. Voss & W.G. Pearcy, 1990 - syn of: Muusoctopus yaquinae (N.A. Voss & W.G. Pearcy, 1990) - (ENTEROCTOPODIDAE)
- macrophragma, Petaloconchus macrophragma P.P. Carpenter, 1857 - (VERMETIDAE)
- Macrophragma, syn of: Genus Petaloconchus H.C. Lea, 1843 (VERMETIDAE)
- Macrophragma, syn of: Genus Petaloconchus H.C. Lea, 1843 (VERMETIDAE)
- macrophtalmica, Curveulima macrophtalmica (A. Warén, 1972) - (EULIMIDAE)
- macrophthalmensis, Pseudopythina macrophthalmensis B.S. Morton & P.H. Scott, 1989 - (KELLIIDAE)
- Macrophylloceras, Genus Macrophylloceras Imlay, 1953 † (PHYLLOCERATIDAE) (FOSSIL)
- Macrophyllum, syn of: Genus Chama C. Linnaeus, 1758 (CHAMIDAE)
- macrophyllus, Irus macrophyllus (G.P. Deshayes, 1853) - (VENERIDAE)
- Macrophysa, Genus Macrophysa F.B. Meek in W.H. Dall, 1870 (PHYSIDAE)
- macropisthus, Unio macropisthus J.R. Bourguignat, 1889 - syn of: Unio pictorum (C. Linnaeus, 1758) - (UNIONIDAE)
- macropleura, Turritella macropleura MANCA Stainbrook - syn of: Turritella seriatimgranulata F.A. Roemer, 1849 † - (TURRITELLIDAE)
- macroplicatus, Radiolites macroplicatus R.P. Whitfield, 1987 † - (RADIOLITIDAE) (FOSSIL)
- macropodus, Octopus macropodus Sangiovanni, 1829 - syn of: Callistoctopus macropus (A. Risso, 1826) - (OCTOPODIDAE)
- macropompa, Onchidoris macropompa A.V. Martynov, T.A. Korshunova, N. Sanamyan & K. Sanamyan, 2009 - (ONCHIDORIDIDAE)
- macroptera, Pteropurpura macroptera (G.P. Deshayes, 1839) - (MURICIDAE)
- macroptera, Merismopteria macroptera (Morris, 1845 †) - (PTERIIDA (UNASSIGNED)) (FOSSIL)
- macroptera, Pteria macroptera J.B.P.A. Lamarck, 1819 - syn of: Pteria penguin (P.F. Röding, 1798) - (PTERIIDAE)
- macroptera, Pterinea macroptera Morris, 1845 † - syn of: Merismopteria macroptera (Morris, 1845 †) - (PTERINEIDAE) (FOSSIL)
- macroptera, Hippochrenes macroptera (J.B.P.A. Lamarck, 1803 †) - (ROSTELLARIIDAE) (FOSSIL)
- macroptera, Rostellaria macroptera H.W. Von Abich, 1858 † - syn of: Hippochrenes abichi Alekseev, 1963 † - (ROSTELLARIIDAE) (FOSSIL)
- macroptera, Dosinia macroptera C.A. Fleming, 1943 † - (VENERIDAE) (FOSSIL)
- macroptera, Voluta macroptera F. McCoy, 1874 † - (VOLUTIDAE) (FOSSIL)
- macroptera tremperi, Pteropurpura macroptera tremperi W.H. Dall, 1910 - (MURICIDAE)
- macroptera varß, Rostellaria macroptera varß Sowerby, 1821 † - syn of: Hippochrenes oligocenicus Lefevre, 1881 † - (ROSTELLARIIDAE) (FOSSIL)
- macropteroides, Rostellaria macropteroides L.M.D. Bellardi, 1852 † - (ROSTELLARIIDAE) (FOSSIL)
- macropthalmica, Curveulima macropthalmica (A. Warén, 1972) - syn of: Curveulima macrophtalmica (A. Warén, 1972) - (EULIMIDAE)
- macroptychia, Tornatellides macroptychia (C.M.F. Ancey, 1903) - (ACHATINELLIDAE)
- Macroptychia, Genus Macroptychia O. Böttger, 1877 (CLAUSILIIDAE)
- macroptychia, Margaritiphaedusa macroptychia H. Nordsieck, 2007 - (CLAUSILIIDAE)
- macropus, Mexichromis macropus W.B. Rudman, 1983 - (CHROMODORIDIDAE)
- macropus, Austropyrgus macropus A. Clark, W.B. Miller & W.F. Ponder, 2003 - (HYDROBIIDAE)
- macropus, Callistoctopus macropus (A. Risso, 1826) - (OCTOPODIDAE)
- macropus, Polypus macropus A. Risso, 1826 - syn of: Callistoctopus macropus (A. Risso, 1826) - (OCTOPODIDAE)
- macropus, Octopus macropus A. Risso, 1826 - syn of: Callistoctopus macropus (A. Risso, 1826) - (OCTOPODIDAE)
- macropus minor, Polypus macropus minor M. Sasaki, 1920 - syn of: Octopus minor (M. Sasaki, 1920) - (OCTOPODIDAE)
- macropygus, Unio macropygus J. Da Silva e Castro, 1885 - syn of: Unio arcuatus N.R. Bouchard-Chantereaux, 1838 - (UNIONIDAE)
- Macrorbis, Subgenus Mendana (Macrorbis) F.C. Baker, 1938 (EUCONULIDAE)
- macrorhyncha, Nucula macrorhyncha Spriestersbach, 1925 † - syn of: Nuculoidea corbuliformis (J.W. Hall & R.P. Whitfield, 1869 †) - (NUCULIDAE) (FOSSIL)
- macrorhynchus, Cuspidaria macrorhynchus E.A. Smith, 1895 - (CUSPIDARIIDAE)
- macrorhynchus, Unio macrorhynchus J.R. Bourguignat, 1882 - syn of: Unio arcuatus N.R. Bouchard-Chantereaux, 1838 - (UNIONIDAE)
- macros, Liebea macros Liang, 1980 † - (MYALINIDAE) (FOSSIL)
- Macroscaphites, Genus Macroscaphites Macroscaphites † (MACROSCAPHITIDAE) (FOSSIL)
- MACROSCAPHITIDAE Hyatt, 1900 † - Family (CEPHALOPODA-AMMONOIDEA [Subclass]-TURRILITINA [Order]-PTYCHOCERATOIDEA [Superfamily]) (FOSSIL)
- Macroscenella, Genus Macroscenella Wilson, 1951 † (ARCHAEOPHIALIDAE) (FOSSIL)
- macroschisma, Monia macroschisma G.P. Deshayes, 1839 - syn of: Pododesmus macrochisma (G.P. Deshayes, 1839) - (ANOMIIDAE)
- Macroschisma, Genus Macroschisma J.E. Gray, 1835 (FISSURELLIDAE)
- macroschisma, Gastrochaena macroschisma G.P. Deshayes, 1855 - (GASTROCHAENIDAE)
- macrosculpturata, Canthidomus macrosculpturata Papp, 1953 † - (MELANOPSIDAE) (FOSSIL)
- macrosculpturata longitesta, Canthidomus macrosculpturata longitesta Papp, 1953 † - (MELANOPSIDAE) (FOSSIL)
- Macrosinister, syn of: Genus Magnosinister C.F. Laseron, 1954 (TRIPHORIDAE)
- Macrosinus, syn of: Genus Paracomitas A. Powell, 1942 (PSEUDOMELATOMIDAE)
- Macrosolen, Genus Macrosolen Brongniart, 1823 † (MONTACUTIDAE) (FOSSIL)
- macrosoma, Chiroteuthis macrosoma C. Goodrich, 1896 - (CHIROTEUTHIDAE)
- macrosoma, Neniella macrosoma H. Nordsieck, 2010 - (CLAUSILIIDAE)
- macrosoma, Rossia macrosoma (S. Delle Chiaje, 1830) - (SEPIOLIDAE)
- macrospira, Solenosteira macrospira S.S. Berry, 1957 - (BUCCINIDAE)
- macrospira, Fusiaphera macrospira (A. Adams & L.A. Reeve, 1850) - (CANCELLARIIDAE)
- macrospira, Cancellaria macrospira A. Adams & L.A. Reeve, 1850 - syn of: Fusiaphera macrospira (A. Adams & L.A. Reeve, 1850) - (CANCELLARIIDAE)
- macrospira, Vexillum macrospira (A. Adams, 1853) - (COSTELLARIIDAE)
- macrospira, Costellaria macrospira T.A. Okutani, 2000 - syn of: Vexillum rodgersi R. Salisbury & J. Wolff, 2005 - (COSTELLARIIDAE)
- macrospira, Clavilithes macrospira A.E.M. Cossmann, 1889 † - (FASCIOLARIIDAE) (FOSSIL)
- Macrospira, syn of: Subgenus Melanopsis (Stilospirula) Rovereto, 1899 † (MELANOPSIDAE) (FOSSIL)
- macrospira, Cyrtostropha macrospira (J.W. Hall, 1852 †) - (MURCHISONIIDAE) (FOSSIL)
- macrospira, Coelidium macrospira J.W. Hall, 1852 † - syn of: Cyrtostropha macrospira (J.W. Hall, 1852 †) - (MURCHISONIIDAE) (FOSSIL)
- macrospira, Sigmataxis macrospira C.B. Adams, 1851 - syn of: Volutaxis macrospira (C.B. Adams, 1851) - (OLEACINIDAE)
- macrospira, Volutaxis macrospira (C.B. Adams, 1851) - (SPIRAXIDAE)
- macrospira, Terebra macrospira C.C. Li, 1930 - syn of: Terebra robusta R.B. Hinds, 1844 - (TEREBRIDAE)
- macrospira macrospiratoides, Fusiaphera macrospira macrospiratoides (A. Adams & L.A. Reeve, 1850) - (CANCELLARIIDAE)
- macrospira producta, Fusiaphera macrospira producta (A. Adams & L.A. Reeve, 1850) - (CANCELLARIIDAE)
- macrospiratoides, Cancellaria macrospiratoides T. Habe, 1961 - syn of: Fusiaphera macrospira macrospiratoides (A. Adams & L.A. Reeve, 1850) - (CANCELLARIIDAE)
- macrospiratoides, Fusiaphera macrospira macrospiratoides (A. Adams & L.A. Reeve, 1850) - (CANCELLARIIDAE)
- macrospiratus, Clavilithes macrospiratus A.W. Grabau, 1904 † - (FASCIOLARIIDAE) (FOSSIL)
- macrostena, Anodonta macrostena G. Servain, 1882 - syn of: Anodonta cygnea (C. Linnaeus, 1758) - (UNIONIDAE)
- macrostoma, Aclis macrostoma J.C.N. Barros, S.F.B. de Lima & J. de A. Francisco, 2007 - (ACLIDIDAE)
- macrostoma, Teratobaicalia macrostoma (W.A. Lindholm, 1909) - (AMNICOLIDAE)
- macrostoma, Cultrigera macrostoma (Sowerby in Fitton, 1836 †) - (APORRHAIDAE) (FOSSIL)
- macrostoma, Agardhiella macrostoma P. Hesse, 1916 - syn of: Agardhiella macrodonta (P. Hesse, 1916) - (ARGNIDAE)
- macrostoma, Bellerophon macrostoma A. Römer, 1843 † - (BELLEROPHONTIDAE) (FOSSIL)
- macrostoma, Helicostyla macrostoma L. Pfeiffer, 1843 - (BRADYBAENIDAE)
- macrostoma, Chloritis macrostoma G.P.L.K. Gude, 1906 - (CAMAENIDAE)
- macrostoma, Colina macrostoma (R.B. Hinds, 1844) - (CERITHIIDAE)
- macrostoma, Cerithium macrostoma R.B. Hinds, 1844 - syn of: Colina macrostoma (R.B. Hinds, 1844) - (CERITHIIDAE)
- macrostoma, Clathurella macrostoma (L.A. Reeve, 1846) - (CLATHURELLIDAE)
- macrostoma, Muticaria macrostoma (F.J. Cantraine, 1835) - (CLAUSILIIDAE)
- macrostoma, Cirsochilus macrostoma (G.P. Deshayes, 1863 †) - (COLLONIIDAE) (FOSSIL)
- macrostoma, Parametaria macrostoma (L.A. Reeve, 1858) - (COLUMBELLIDAE)
- macrostoma, Columbella macrostoma H.E. Anton, 1839 - syn of: Anachis varicosa (J.S. Gaskoin, 1851) - (COLUMBELLIDAE)
- macrostoma, Anachis macrostoma L.A. Reeve, 1859 - syn of: Anachis varicosa (J.S. Gaskoin, 1851) - (COLUMBELLIDAE)
- macrostoma, Columbella macrostoma L.A. Reeve, 1859 - syn of: Anachis varicosa (J.S. Gaskoin, 1851) - (COLUMBELLIDAE)
- macrostoma, Naticopsis macrostoma C.L.F. von Sandberger & C.L.F. von Sandberger, 1854 † - syn of: Paffrathopsis macrostoma (C.L.F. von Sandberger & C.L.F. von Sandberger, 1854 †) - (DELPHINULOPSIDAE) (FOSSIL)
- macrostoma, Opisthostoma macrostoma W.T. Blanford, 1869 - (DIPLOMMATINIDAE)
- macrostoma, Diancta macrostoma O.F. von Möllendorff, 1897 † - (DIPLOMMATINIDAE) (FOSSIL)
- macrostoma, Subzebrinus macrostoma (O.F. von Möllendorff, 1902) - (ENIDAE)
- macrostoma, Mourlonia macrostoma (C.L.F. von Sandberger & C.L.F. von Sandberger, 1853 †) - (GOSSELETINIDAE) (FOSSIL)
- macrostoma, Campylaea planospira macrostoma (E.A. Rossmässler, 1837) - (HELICIDAE)
- macrostoma, Pseudamnicola macrostoma (H.C. Küster, 1852) - (HYDROBIIDAE)
- macrostoma, Insignia macrostoma A.M. Angelov, 1972 - (HYDROBIIDAE)
- macrostoma, Alzoniella macrostoma M. Bodon & S. Cianfanelli, 2002 - (HYDROBIIDAE)
- macrostoma, Trochoidea spratti macrostoma E.C. Von Martens, 1873 - (HYGROMIIDAE)
- macrostoma, Larocheopsis macrostoma D.L. Geiger & B.A. Marshall, 2012 - (LAROCHEIDAE)
- macrostoma, Melanopsis macrostoma J.R. Bourguignat, 1884 - (MELANOPSIDAE)
- macrostoma, Purpura macrostoma H.C. Küster, 1860 - syn of: Stramonita haemastoma (C. Linnaeus, 1767) - (MURICIDAE)
- macrostoma, Purpura macrostoma T.A. Conrad, 1837 - syn of: Drupa aperta (H.M.D. de Blainville, 1832) - (MURICIDAE)
- macrostoma, Natica macrostoma R.A. Philippi, 1852 - syn of: Mammilla kurodai (Is. Taki, 1944) - (NATICIDAE)
- macrostoma, Paffrathopsis macrostoma (C.L.F. von Sandberger & C.L.F. von Sandberger, 1854 †) - (NERITOPSIDAE) (FOSSIL)
- macrostoma, Pholas macrostoma R.A. Philippi, 1858 - syn of: Pholas chiloensis (J.I. Molina, 1782) - (PHOLADIDAE)
- macrostoma, Faxia macrostoma J.P.J. Ravn, 1933 † - (PICKWORTHIIDAE) (FOSSIL)
- macrostoma, Pseudotritonium macrostoma (E.A.L. Kittl 1894 †) - (PSEUDOTRITONIIDAE) (FOSSIL)
- macrostoma, Rossia macrostoma S. Delle Chiaje, 1830 - syn of: Rossia macrosoma (S. Delle Chiaje, 1830) - (SEPIOLIDAE)
- macrostoma, Teinostoma macrostoma F. Stoliczka, 1861 † - (TORNIDAE) (FOSSIL)
- macrostoma, Trocholites macrostoma R. Schröder, 1891 † - (TROCHOLITIDAE) (FOSSIL)
- macrostoma, Cylindrella macrostoma L. Pfeiffer, 1857 - syn of: Anoma striata (C.B. Adams, 1851) - (UROCOPTIDAE)
- macrostoma, Valvata macrostoma (O.A.L. Mörch, 1864) - (VALVATIDAE)
- macrostoma, Talassia macrostoma (K.H.J. Thiele, 1925) - (VANIKORIDAE)
- macrostoma, Paludina macrostoma H.C. Küster, 1852 - syn of: Pseudamnicola macrostoma (H.C. Küster, 1852) - (VIVIPARIDAE)
- macrostoma anapensis, Valvata macrostoma anapensis C.A. Westerlund, 1883 - (VALVATIDAE)
- macrostoma gracilis, Helicostyla macrostoma gracilis (O.F. von Möllendorff, 1898) - (BRADYBAENIDAE)
- macrostoma mamotica, Muticaria macrostoma mamotica (G. Gulia, 1861) - (CLAUSILIIDAE)
- macrostoma negropontica, Pseudamnicola macrostoma negropontica (S. Clessin, 1878) - (HYDROBIIDAE)
- macrostoma oscitans, Muticaria macrostoma oscitans (J.G.F. de Charpentier, 1852) - (CLAUSILIIDAE)
- macrostoma scalaris, Muticaria macrostoma scalaris (L. Pfeiffer, 1848) - (CLAUSILIIDAE)
- macrostoma vizcayana, Helicostyla macrostoma vizcayana P. Bartsch, 1919 - (BRADYBAENIDAE)
- macrostomoides, Salpingostoma macrostomoides Spriestersbach, 1925 † - (BUCANIIDAE) (FOSSIL)
- macrostomum, Conradoceras macrostomum Foerste, 1928 † - syn of: Reedsoceras macrostomum (J.W. Hall, 1847 †) - (HEMIPHRAGMOCERATIDAE) (FOSSIL)
- macrostomum, Cyrtoceras macrostomum J.W. Hall, 1847 † - syn of: Reedsoceras macrostomum (J.W. Hall, 1847 †) - (ONCOCERIDA (unassigned)) (FOSSIL)
- macrostomum, Reedsoceras macrostomum (J.W. Hall, 1847 †) - (WESTONOCERATIDAE) (FOSSIL)
- macrostomus, Hawletrochus macrostomus (J.W. Hall, 1861 †) - (ELASMONEMATIDAE) (FOSSIL)
- macrostomus, Holopea macrostomus J.W. Hall, 1861 † - (HOLOPEIDAE) (FOSSIL)
- macrostomus, Macrocheilus macrostomus J.W. Hall, 1861 † - syn of: Hawletrochus macrostomus (J.W. Hall, 1861 †) - (SOLENISCIDAE) (FOSSIL)
- macrostriatus, Theodoxus turislavicus macrostriatus Papp, 1953 † - (NERITIDAE) (FOSSIL)
- Macrostrombus, syn of: Genus Lobatus W.J. Swainson, 1837 (STROMBIDAE)
- macrotelus, Cyrtosiceras macrotelus (Oppel, 1865 †) - (OPPELIIDAE) (FOSSIL)
- macrothalma, Haswellia macrothalma (Haswell †) - (EUOMPHALIDAE) (FOSSIL)
- macrotheca, Thecalia macrotheca A. Adams & G.F. Angas, 1864 - syn of: Thecalia concamerata (J.G. Bruguière, 1792) - (CARDITIDAE)
- Macrotheca, Genus Macrotheca Waagen , 1880 † (TRAPEZOVITIDAE) (FOSSIL)
- macrothi, Pecten macrothi K.C. Schauroth, 1856 † - syn of: Streblopteria pusilla (von Schlotheim, 1816 †) - (PECTINIDAE) (FOSSIL)
- Macrothylacus, syn of: Genus Tandonia R.P. Lesson & C. Pollonera, 1882 (MILACIDAE)
- macrotis, Nenia macrotis P. Ehrmann, 1905 - syn of: Incania pilsbryi (E.R. Sykes, 1901) - (CLAUSILIIDAE)
- Macrotoma, syn of: Genus Macoma W.E. Leach, 1819 (TELLINIDAE)
- macrotrema, Fissurella macrotrema G.B. I Sowerby, 1835 - (FISSURELLIDAE)
- macrotremis, Natica macrotremis A. Adams & L.A. Reeve, 1850 - syn of: Eunaticina umbilicata (J.R.C. Quoy & J.P. Gaimard, 1832) - (NATICIDAE)
- Macrotrigonia, Genus Macrotrigonia Camacho & Olivero, 1985 † (MYOPHORELLIDAE) (FOSSIL)
- Macrotritopus, Genus Macrotritopus G.J. Von Grimpe, 1922 (OCTOPODIDAE)
- macrotuberculata, Phyllidiopsis macrotuberculata Á. Valdés, 2001 - (PHYLLIDIIDAE)
- macrotyla, Graneledone macrotyla N.A. Voss, 1976 - (OCTOPODIDAE)
- macroumbilicus, Barremites macroumbilicus Matsukawa & Obata, 2015 † - (BARREMITIDAE) (FOSSIL)
- macroura, Cerithiella macroura (J.C. Melvill & R. Standen, 1912) - (NEWTONIELLIDAE)
- macrourum, Tritonium macrourum J.H.F. Link, 1807 - syn of: Ranularia gutturnia (P.F. Röding, 1798) - (BUCCINIDAE)
- macrovoluta, Siphocypraea macrovoluta C.S. Ferreira & O.R. Cunha, 1957 † - (CYPRAEIDAE) (FOSSIL)
- Macrozafra, Genus Macrozafra H.J. Finlay, 1927 (COLUMBELLIDAE)
- Macrozonites, Genus Macrozonites Wenz, 1919 † (ZONITIDAE) (FOSSIL)
- macrum, Caecum macrum J. van der Linden & R.G. Moolenbeek, 2000 - (CAECIDAE)
- macrum, Arieticeras macrum Monestier, 1934 † - (HILDOCERATIDAE) (FOSSIL)
- macrum, Paracenoceras macrum Tinant, 1987 † - (PARACENOCERATIDAE) (FOSSIL)
- macrum, Skirroceras macrum (F.A. von Quenstedt, 1886 †) - (STEPHANOCERATIDAE) (FOSSIL)
- Macrurella, Genus Macrurella Bellardi, 1890 † (NEOGASTROPODA (UNASSIGNED)) (FOSSIL)
- macrus, Lomasulcachites macrus Z.X. Qian & L.Y. Jiang, 1982 † - (SIPHOGONUCHITIDAE) (FOSSIL)
- macrus, Lomasulcachites macrus Luo & al., 1982 † - (SIPHOGONUCHITIDAE) (FOSSIL)
- macsotayi, Calliostoma macsotayi B.M. Landau & F. Da Silva, 2010 † - (CALLIOSTOMATIDAE) (FOSSIL)
- macsotayi, Chemnitzia macsotayi B.M. Landau & P.I. LaFollette, 2015 - (PYRAMIDELLIDAE)
- macsporrani, Penion macsporrani (R.A. Philippi, 1887 †) - (BUCCINIDAE) (FOSSIL)
- macsweeneyi, Montaropa macsweeneyi F.M. Climo, 1984 - (CHAROPIDAE)
- macta, Succinea macta F. Poey, 1858 - (SUCCINEIDAE)
- mactanense, Homalopoma mactanense Y.F. Huang, C.C. Fu & G.T. Poppe, 2016 - (COLLONIIDAE)
- mactanense, Astralium lapillus mactanense T. Habe & T.A. Okutani, 1980 - (TURBINIDAE)
- mactanensis, Engina spica mactanensis W.O. Cernohorsky, 1985 - (BUCCINIDAE)
- mactanensis, Seila mactanensis A. Cecalupo & I. Perugia, 2012 - (CERITHIOPSIDAE)
- mactanensis, Synthopsis mactanensis A. Cecalupo & I. Perugia, 2012 - (CERITHIOPSIDAE)
- mactanensis, Favartia mactanensis (W.K. Emerson & D'Attilio, 1979) - (MURICIDAE)
- mactanensis, Murexiella mactanensis W.K. Emerson & D'Attilio, 1979 - syn of: Favartia mactanensis (W.K. Emerson & D'Attilio, 1979) - (MURICIDAE)
- mactanensis, Microliotia mactanensis T. Kase, 1998 - (PICKWORTHIIDAE)
- mactanensis, Clathroterebra mactanensis (T. Bratcher & W.O. Cernohorsky, 1982) - (TEREBRIDAE)
- mactanica, Trivirostra mactanica D. Fehse & J. Grego, 2002 - (TRIVIIDAE)
- mactanica, Alaerato mactanica (T. Cossignani & V. Cossignani, 1997) - (TRIVIIDAE)
- Macteola, Genus Macteola C. Hedley, 1918 (MANGELIIDAE)
- macteola, Eucithara macteola R.N. Kilburn, 1992 - (MANGELIIDAE)
- Mactesia, syn of: Genus Martesia G.B. Sowerby, 1824 (PHOLADIDAE)
- Mactomyella, syn of: Genus Mactromyella † (MACTROMYIDAE) (FOSSIL)
- mactra, Pleydellia mactra Dumortier 1874 † - (HILDOCERATIDAE) (FOSSIL)
- Mactra, Genus Mactra C. Linnaeus, 1767 (MACTRIDAE)
- mactra, Annularita majuscula mactra (F. Poey, 1852) - (POMATIIDAE)
- mactracea, Astarte mactracea E.G. Linsley, 1845 - syn of: Crassinella lunulata (T.A. Conrad, 1834) - (ASTARTIDAE)
- mactracea, Crassinella mactracea E.G. Linsley, 1845 - syn of: Crassinella lunulata (T.A. Conrad, 1834) - (CRASSATELLIDAE)
- mactracea, Dosina mactracea (W.J. Broderip, 1835) - (VENERIDAE)
- mactracea, Dosinia mactracea W.J. Broderip, 1835 - syn of: Dosina mactracea (W.J. Broderip, 1835) - (VENERIDAE)
- mactracea, Venus mactracea W.J. Broderip, 1835 - syn of: Dosina mactracea (W.J. Broderip, 1835) - (VENERIDAE)
- mactrae, Mytilicola mactrae Hoshina & Y. Kuwabara, 1959 - syn of: Mactra quadrangularis L.A. Reeve, 1854 - (MACTRIDAE)
- mactraeformis, Cryptodon mactraeformis R. Tate, 1887 † - (MACTRIDAE) (FOSSIL)
- mactraeformis, Ezonuculana mactraeformis (T. Nagao, 1932 †) - (NUCULANIDAE) (FOSSIL)
- mactraeformis obsoleta, Ezonuculana mactraeformis obsoleta (T. Nagao, 1932 †) - (NUCULANIDAE) (FOSSIL)
- Mactrella, Subgenus Mactra (Mactrella) Gray † (MACTRIDAE) (FOSSIL)
- Mactrella, syn of: Genus Mactrinula J.E. Gray, 1853 (MACTRIDAE)
- Mactrellona, Genus Mactrellona E.S. Marks, 1915 (MACTRIDAE)
- Mactresia, syn of: Genus Martesia G.B. Sowerby, 1824 (PHOLADIDAE)
- MACTRIDAE Lamarck, 1809 - Family (BIVALVIA-HETERODONTA [Subclass]-EUHETERODONTA [Infraclass]-IMPARIDENTIA [Superorder]-VENERIDA [Order]-MACTROIDEA [Superfamily])
- mactriformis, Pachydon mactriformis (Meek & Hayden 1856) † - (CORBULIDAE) (FOSSIL)
- mactriformis, Lentidium mactriformis S. Biondi-Giunti, 1859 - syn of: Lentidium mediterraneum (A. da Costa, 1830) - (CORBULIDAE)
- Mactrina, syn of: Genus Goodallia W.H. Turton, 1822 (ASTARTIDAE)
- Mactrinula, Genus Mactrinula J.E. Gray, 1853 (MACTRIDAE)
- Mactroderma, syn of: Subgenus Mactra (Mactrotoma) W.H. Dall, 1894 (MACTRIDAE)
- Mactrodesma, Genus Mactrodesma Conrad, 1869 † (MACTRIDAE) (FOSSIL)
- Mactrodesma, syn of: Genus Mactromeris T.A. Conrad, 1868 (MACTRIDAE)
- Mactroidea, syn of: Genus Goodallia W.H. Turton, 1822 (ASTARTIDAE)
- mactroides, Reloncavia mactroides (R. Tate & W.L. May, 1900) - (CYAMIIDAE)
- mactroides, Erodona mactroides F.M. Daudin, 1802 - (ERODONIDAE)
- mactroides, Bornia mactroides (T.A. Conrad, 1834 †) - (KELLIIDAE) (FOSSIL)
- mactroides, Melliteryx mactroides (S.C.T. Hanley, 1857) - (LASAEIDAE)
- mactroides, Pythina mactroides S.C.T. Hanley, 1857 - syn of: Melliteryx mactroides (S.C.T. Hanley, 1857) - (LASAEIDAE)
- mactroides, Amarilladesma mactroides (L.A. Reeve, 1854) - (MESODESMATIDAE)
- mactroides, Mesodesma mactroides L.A. Reeve, 1854 - syn of: Amarilladesma mactroides (L.A. Reeve, 1854) - (MESODESMATIDAE)
- mactroides, Dermatomya mactroides (W.H. Dall, 1889) - (POROMYIDAE)
- mactroides, Tivela mactroides (I. von Born, 1778) - (VENERIDAE)
- mactroides, Venus mactroides I. von Born, 1778 - syn of: Tivela mactroides (I. von Born, 1778) - (VENERIDAE)
- mactroides nasuta, Tivela mactroides nasuta W.H. Dall, 1902 - syn of: Tivela mactroides (I. von Born, 1778) - (VENERIDAE)
- Mactromeris, Genus Mactromeris T.A. Conrad, 1868 (MACTRIDAE)
- Mactromya, Genus Mactromya Agassiz, 1843 † (MACTROMYIDAE) (FOSSIL)
- Mactromyella, Genus Mactromyella † (MACTROMYIDAE) (FOSSIL)
- MACTROMYIDAE Cox, 1929 † - Family (BIVALVIA-HETERODONTA [Subclass]-EUHETERODONTA [Infraclass]-IMPARIDENTIA [Superorder]-LUCINIDA [Order]-LUCINOIDEA [Superfamily]) (FOSSIL)
- Mactromyopsis, Genus Mactromyopsis Chavan, 1905 † (MACTROMYIDAE) (FOSSIL)
- Mactrona, Genus Mactrona Marwick, 1952 † (CARDIIDA (UNASSIGNED)) (FOSSIL)
- Mactropsis, Genus Mactropsis Conrad, 1854 † (MACTRIDAE) (FOSSIL)
- mactropsis, Panchione mactropsis (T.A. Conrad, 1865 †) - (VENERIDAE) (FOSSIL)
- mactropsis, Gratelupia mactropsis T.A. Conrad, 1865 † - syn of: Panchione mactropsis (T.A. Conrad, 1865 †) - (VENERIDAE) (FOSSIL)
- Mactrotoma, Subgenus Mactra (Mactrotoma) W.H. Dall, 1894 (MACTRIDAE)
- macula, Buccinum macula G. Montagu, 1803 - syn of: Tritia incrassata (H. Strøm, 1768) - (BUCCINIDAE)
- macula, Purpuradusta gracilis macula (G.F. Angas, 1867) - (CYPRAEIDAE)
- macula, Gibberula macula T. McCleery, 2009 - (CYSTISCIDAE)
- macula, Diala macula G. Nevill, 1885 - syn of: Diala semistriata (R.A. Philippi, 1849) - (DIALIDAE)
- macula cholmondelyi, Cypraea macula cholmondelyi J.C. Melvill, 1888 - syn of: Purpuradusta gracilis notata (T.N. Gill, 1858) - (CYPRAEIDAE)
- macula hilda, Erosaria macula hilda T. Iredale, 1932 - syn of: Purpuradusta gracilis notata (T.N. Gill, 1858) - (CYPRAEIDAE)
- maculafasciata, Mitrella maculafasciata K. Monsecour & D. Monsecour, 2016 - (COLUMBELLIDAE)
- maculapodium, Plocamopherus maculapodium Y. Vallès & T.M. Gosliner, 2006 - (POLYCERIDAE)
- macularia, Strophiops macularia C.J. Maynard, 1913 - syn of: Cerion eximium C.J. Maynard, 1894 - (CERIONIDAE)
- Macularia, Genus Macularia J.A. Albers, 1850 (HELICIDAE)
- Macularion, Genus Macularion Stanisic, 2010 (HELICARIONIDAE)
- maculata, Posterobranchaea maculata D'Orbigny, 1835 - syn of: Navanax inermis (J.G. Cooper, 1862) - (AGLAJIDAE)
- maculata, Deroceras maculata R.T. Lowe, 1855 - syn of: Deroceras reticulatum (O.F. Müller, 1774) - (AGRIOLIMACIDAE)
- maculata, Pomacea maculata (G. Perry, 1810) - (AMPULLARIIDAE)
- maculata, Aplysia maculata P.C.A.S.L. Rang, 1828 - (APLYSIIDAE)
- maculata, Architectonica maculata (J.H.F. Link, 1807) - (ARCHITECTONICIDAE)
- maculata, Arca maculata G.B. I Sowerby, 1833 - syn of: Arca patriarchalis P.F. Röding, 1798 - (ARCIDAE)
- maculata, Armina maculata C.S. Rafinesque, 1814 - (ARMINIDAE)
- maculata, Pseudaneitea maculata D.W. Burton, 1963 - (ATHORACOPHORIDAE)
- maculata, Cominella maculata J.E. Gray, 1835 - syn of: Cominella adspersa (J.G. Bruguière, 1789) - (BUCCINIDAE)
- maculata, Engina lineata maculata W.H. Pease, 1869 - (BUCCINIDAE)
- maculata, Oxychona maculata R.B. Salvador & D.C. Cavallari, 2013 - (BULIMULIDAE)
- maculata, Sigapatella maculata H.H. Suter, 1913 - syn of: Sigapatella novaezelandiae (R.P. Lesson, 1831) - (CALYPTRAEIDAE)
- maculata, Crepidula maculata J.R.C. Quoy & J.P. Gaimard, 1832 - syn of: Sigapatella novaezelandiae (R.P. Lesson, 1831) - (CALYPTRAEIDAE)
- maculata, Diacria maculata P. Bleeker & S. Van Der Spoel, 1988 - syn of: Diacria trispinosa (de Blainville, 1821) - (CAVOLINIIDAE)
- maculata, Pseudovertagus maculata T. Martyn, 1786 - syn of: Pseudovertagus clava (J.F. Gmelin, 1791) - (CERITHIIDAE)
- maculata, Climocella maculata (H.H. Suter, 1891) - (CHAROPIDAE)
- maculata, Granata maculata (J.R.C. Quoy & J.P. Gaimard, 1834) - (CHILODONTIDAE)
- maculata, Turcica maculata (J.W. Brazier, 1877) - (CHILODONTIDAE)
- maculata, Albinaria caerulea maculata (E.A. Rossmässler, 1836) - (CLAUSILIIDAE)
- maculata, Gradiella maculata (Stoppani, 1858 †) - (COELOSTYLINIDAE) (FOSSIL)
- maculata, Steironepion maculata (C.B. Adams, 1850) - (COLUMBELLIDAE)
- maculata, Teuthowenia maculata (W.E. Leach, 1817) - (CRANCHIIDAE)
- maculata, Mauritia maculata D.H. Barnes, 1824 - syn of: Mauritia maculifera F.A. Schilder, 1932 - (CYPRAEIDAE)
- maculata, Notocypraea maculata G. Perry, 1811 - syn of: Notocypraea angustata (J.F. Gmelin, 1791) - (CYPRAEIDAE)
- maculata, Cypraea maculata G. Perry, 1811 - syn of: Notocypraea angustata (J.F. Gmelin, 1791) - (CYPRAEIDAE)
- maculata, Cypraea maculata J.F. Gmelin, 1791 - syn of: Zonaria pyrum (J.F. Gmelin, 1791) - (CYPRAEIDAE)
- maculata, Persicula maculata W.J. Swainson, 1840 - syn of: Persicula persicula (C. Linnaeus, 1758) - (CYSTISCIDAE)
- maculata, Dendrodoris maculata J.J. Risbec, 1928 - (DENDRODORIDIDAE)
- maculata, Halgerda maculata (C.N.E. Eliot, 1906) - (DISCODORIDIDAE)
- maculata, Baptodoris maculata P. Bouchet, 1977 - syn of: Baptodoris cinnabarina L.S.R. Bergh, 1884 - (DISCODORIDIDAE)
- maculata, Doris maculata S.L. Garstang, 1895 - syn of: Doris sticta (T. Iredale & O'Donoghue, 1923) - (DORIDIDAE)
- maculata, Doris maculata G. Montagu, 1804 - syn of: Doto maculata (G. Montagu, 1804) - (DORIDIDAE)
- maculata, Doto maculata (G. Montagu, 1804) - (DOTIDAE)
- maculata, Pythia maculata G. Perry, 1811 - syn of: Pythia scarabaeus (C. Linnaeus, 1758) - (ELLOBIIDAE)
- maculata, Phidiana maculata S. Trinchese, 1888 - syn of: Caloria elegans (J. Alder & A. Hancock, 1845) - (FACELINIDAE)
- maculata, Emarginula maculata A. Adams, 1863 - (FISSURELLIDAE)
- maculata, Emarginula maculata S.M. Souverbie, 1872 - syn of: Emarginula souverbiana H.A. Pilsbry, 1891 - (FISSURELLIDAE)
- maculata, Glycymeris maculata W.J. Broderip, 1832 - (GLYCYMERIDIDAE)
- maculata, Trapania maculata H.R. Haefelfinger, 1960 - (GONIODORIDIDAE)
- maculata, Gymnodoris maculata W. Stimpson, 1855 - (GYMNODORIDIDAE)
- maculata, Anacithara ione maculata (J.L. Bouge & P. Dautzenberg, 1914) - (HORAICLAVIDAE)
- maculata, Discula maculata R.T. Lowe, 1831 - syn of: Discula cheiranthicola (R.T. Lowe, 1831) - (HYGROMIIDAE)
- maculata, Lytopelte maculata (F.C.L. Koch & D.F. Heynemann in E.C. Von Martens, 1874) - (LIMACIDAE)
- maculata, Litiopa maculata P.C.A.S.L. Rang, 1829 - syn of: Litiopa melanostoma P.C.A.S.L. Rang, 1829 - (LITIOPIDAE)
- maculata, Mactra maculata J.F. Gmelin, 1791 - (MACTRIDAE)
- maculata, Mactra maculata J.H. Chemnitz, 1782 - syn of: Mactra maculata J.F. Gmelin, 1791 - (MACTRIDAE)
- maculata, Mangelia maculata (L.A. Reeve, 1846) - (MANGELIIDAE)
- maculata, Tenaturris trilineata maculata G.W. Nowell-Usticke, 1969 - (MANGELIIDAE)
- maculata, Marginella maculata S.G. Veldsman, 2013 - (MARGINELLIDAE)
- maculata, Melanopsis maculata I. Lea, 1832 - syn of: Aylacostoma maculatum (I. Lea, 1832) - (MELANOPSIDAE)
- maculata, Tandonia maculata W.E. Collinge, 1895 - syn of: Tandonia sowerbyi (A.E.J. Férussac, 1823) - (MILACIDAE)
- maculata, Amalia maculata F.C.L. Koch & D.F. Heynemann in E.C. Von Martens, 1874 - syn of: Lytopelte maculata (F.C.L. Koch & D.F. Heynemann in E.C. Von Martens, 1874) - (MILACIDAE)
- maculata, Mitromorpha maculata A.V. Sysoev, 1990 - (MITROMORPHIDAE)
- maculata, Favartia maculata (L.A. Reeve, 1845) - (MURICIDAE)
- maculata, Purpura maculata J.E. Gray, 1835 - syn of: Cominella adspersa (J.G. Bruguière, 1789) - (MURICIDAE)
- maculata, Nassa maculata A. Adams, 1853 - syn of: Nassarius vittatus (A. Adams, 1853) - (NASSARIIDAE)
- maculata, Natica maculata C.U.A. von Salis-Marschlins, 1793 - syn of: Naticarius hebraeus (T. Martyn, 1786) - (NATICIDAE)
- maculata, Natica maculata G.P. Deshayes, 1838 - syn of: Naticarius hebraeus (T. Martyn, 1786) - (NATICIDAE)
- maculata, Tectonatica maculata G. Perry, 1811 - syn of: Notocochlis tigrina (P.F. Röding, 1798) - (NATICIDAE)
- maculata, Nerita maculata C.U.A. von Salis-Marschlins, 1793 - syn of: Naticarius hebraeus (T. Martyn, 1786) - (NERITIDAE)
- maculata, Nerita maculata W.H. Pease, 1868 - syn of: Nerita argus C.A. Récluz, 1841 - (NERITIDAE)
- maculata, Oliva maculata P.L. Duclos, 1835 - (OLIVIDAE)
- maculata, Agaronia maculata G. Perry, 1811 - syn of: Agaronia hiatula (J.F. Gmelin, 1791) - (OLIVIDAE)
- maculata, Omalogyra atomus maculata T.A. de M. Monterosato - (OMALOGYRIDAE)
- maculata, Onchidella maculata (H.P. Plate, 1893) - (ONCHIDIIDAE)
- maculata, Schileykula maculata B. Páll-Gergely & T. Asami, 2013 - (ORCULIDAE)
- maculata, Ostrea maculata I. von Born, 1778 - syn of: Flexopecten glaber (C. Linnaeus, 1758) - (OSTREIDAE)
- maculata, Pleurobranchaea maculata (J.R.C. Quoy & J.P. Gaimard, 1832) - (PLEUROBRANCHAEIDAE)
- maculata, Triopha maculata F.M. MacFarland, 1905 - (POLYCERIDAE)
- maculata, Thecacera maculata C.N.E. Eliot, 1905 - syn of: Thecacera pennigera (G. Montagu, 1815) - (POLYCERIDAE)
- maculata, Polycera maculata A. Pruvot-Fol, 1951 - syn of: Palio dubia (G.O. Sars, 1829) - (POLYCERIDAE)
- maculata, Tudora maculata H.B. Baker, 1924 - (POMATIIDAE)
- maculata, Hendersonina maculata C. de la Torre & P. Bartsch, 1938 - (POMATIIDAE)
- maculata, Pinctada maculata (A.A. Gould, 1850) - (PTERIIDAE)
- maculata, Gyrina maculata H.C.F. Schumacher, 1817 - syn of: Ranella olearium (C. Linnaeus, 1758) - (RANELLIDAE)
- maculata, Ranella maculata H.C.F. Schumacher, 1817 - syn of: Ranella olearium (C. Linnaeus, 1758) - (RANELLIDAE)
- maculata, Setia maculata (T.A. de M. Monterosato, 1869) - (RISSOIDAE)
- maculata, Pusillina maculata T. Brown, 1844 - syn of: Pusillina inconspicua (J. Alder, 1844) - (RISSOIDAE)
- maculata, Skeneopsis planorbis maculata Unknown - (SKENEOPSIDAE)
- maculata, Solariella maculata Wood, 1842 † - (SOLARIELLIDAE) (FOSSIL)
- maculata, Cyclas maculata H.E. Anton, 1837 - syn of: Eupera bahiensis (J.B. von Spix, 1827) - (SPHAERIIDAE)
- maculata, Cyclas maculata P.M.A. Morelet, 1851 - syn of: Eupera singleyi (H.A. Pilsbry, 1889) - (SPHAERIIDAE)
- maculata, Stenothyra maculata R.A.M. Brandt, 1974 - (STENOTHYRIDAE)
- maculata, Lambis maculata P.F. Röding, 1798 - syn of: Lambis lambis (C. Linnaeus, 1758) - (STROMBIDAE)
- maculata, Tellina maculata W. Turton, 1819 - syn of: Arcopagia crassa (T. Pennant, 1777) - (TELLINIDAE)
- maculata, Oxymeris maculata (C. Linnaeus, 1758) - (TEREBRIDAE)
- maculata, Terebra maculata C. Linnaeus, 1758 - syn of: Oxymeris maculata (C. Linnaeus, 1758) - (TEREBRIDAE)
- maculata, Terebra maculata P. Bartsch & H.A. Rehder, 1939 - syn of: Oxymeris maculata (C. Linnaeus, 1758) - (TEREBRIDAE)
- maculata, Terebra maculata G. Perry, 1811 - syn of: Oxymeris crenulata (C. Linnaeus, 1758) - (TEREBRIDAE)
- maculata, Melanoides maculata (J.G. Bruguière, 1789) - (THIARIDAE)
- maculata, Tonna dolium maculata (J.B.P.A. Lamarck, 1822) - (TONNIDAE)
- maculata, Tritonia maculata J.E. Gray, 1847 - (TRITONIIDAE)
- maculata, Pseudostomatella maculata (J.R.C. Quoy, 1834) - (TROCHIDAE)
- maculata, Thalotia maculata J.W. Brazier, 1877 - syn of: Turcica maculata (J.W. Brazier, 1877) - (TROCHIDAE)
- maculata, Turbinella maculata L.A. Reeve, 1847 - syn of: Latirus maculatus (L.A. Reeve, 1847) - (TURBINELLIDAE)
- maculata, Syrinx maculata P.F. Röding, 1798 - syn of: Fusinus ansatus (J.F. Gmelin, 1791) - (TURBINELLIDAE)
- maculata, Turbinella maculata J.B. Hombron & C.H. Jacquinot, 1848 - syn of: Latirus maculatus (L.A. Reeve, 1847) - (TURBINELLIDAE)
- maculata, Pleurotoma maculata C.B. Adams, 1850 - syn of: Steironepion maculata (C.B. Adams, 1850) - (TURRIDAE)
- maculata, Turritella maculata L.A. Reeve, 1849 - (TURRITELLIDAE)
- maculata, Onchidiopsis maculata K.M. Derjugin, 1937 - (VELUTINIDAE)
- maculata, Callista maculata (C. Linnaeus, 1758) - (VENERIDAE)
- maculata, Venus maculata C. Linnaeus, 1758 - syn of: Callista maculata (C. Linnaeus, 1758) - (VENERIDAE)
- maculata, Semperula maculata (J. Templeton, 1858) - (VERONICELLIDAE)
- maculata, Policordia maculata I.N.V. Ivanova, 1977 - (VERTICORDIIDAE)
- maculata, Amoria maculata (W.J. Swainson, 1822) - (VOLUTIDAE)
- maculata, Voluta maculata P.F. Röding, 1798 - syn of: Voluta musica C. Linnaeus, 1758 - (VOLUTIDAE)
- maculata, Voluta maculata W.J. Swainson, 1822 - syn of: Amoria maculata (W.J. Swainson, 1822) - (VOLUTIDAE)
- maculata, Volvatella maculata K. Jensen, 2015 - (VOLVATELLIDAE)
- maculata arata, Ampullaria maculata arata P.H. Fischer & J.C.H. Crosse, 1890 - syn of: Pomacea flagellata (T. Say, 1829) - (AMPULLARIIDAE)
- maculata caroli, Amoria maculata caroli (T. Iredale, 1924) - (VOLUTIDAE)
- maculata castelnaudii, Pomacea maculata castelnaudii L.H. Hupé, 1857 - (AMPULLARIIDAE)
- maculata confluens, Terebra maculata confluens P. Dautzenberg, 1935 - syn of: Oxymeris maculata (C. Linnaeus, 1758) - (TEREBRIDAE)
- maculata haustrum, Pomacea maculata haustrum (L.A. Reeve, 1857) - (AMPULLARIIDAE)
- maculata lutea, Archidoris maculata lutea A.J.B.M. Vayssière, 1919 - syn of: Doris sticta (T. Iredale & O'Donoghue, 1923) - (DORIDIDAE)
- maculata melo, Cominella maculata melo R.P. Lesson, 1840 - syn of: Cominella adspersa (J.G. Bruguière, 1789) - (BUCCINIDAE)
- maculata picta, Architectonica maculata picta R.A. Philippi, 1849 - (ARCHITECTONICIDAE)
- maculata roosevelti, Terebra maculata roosevelti P. Bartsch & H.A. Rehder, 1970 - syn of: Oxymeris maculata (C. Linnaeus, 1758) - (TEREBRIDAE)
- maculata spenceriana, Amoria maculata spenceriana J.H. Gatliff, 1908 - syn of: Amoria spenceriana (J.H. Gatliff, 1908) - (VOLUTIDAE)
- maculata trapani, Setia maculata trapani T.A. de M. Monterosato, 1869 - (RISSOIDAE)
- maculata volva, Amoria maculata volva (J.F. Gmelin, 1791) - (VOLUTIDAE)
- maculatum, Architectonica maculatum L.A. Reeve, 1848 - syn of: Architectonica perspectiva (C. Linnaeus, 1767) - (ARCHITECTONICIDAE)
- maculatum, Solarium maculatum L.A. Reeve, 1848 - syn of: Architectonica perspectiva (C. Linnaeus, 1767) - (ARCHITECTONICIDAE)
- maculatum, Solarium maculatum C. Linnaeus, 1758 - syn of: Architectonica maculata (J.H.F. Link, 1807) - (ARCHITECTONICIDAE)
- maculatum, Buccinum maculatum C. Linnaeus, 1758 - syn of: Oxymeris maculata (C. Linnaeus, 1758) - (BUCCINIDAE)
- maculatum, Buccinum maculatum T. Martyn, 1784 - syn of: Cominella adspersa (J.G. Bruguière, 1789) - (BUCCINIDAE)
- maculatum, Caecum maculatum T. Habe, 1963 - syn of: Caecum sepimentum L. de Folin, 1868 - (CAECIDAE)
- maculatum, Dinocardium maculatum J.F. Gmelin, 1791 - syn of: Dinocardium robustum (J. Lightfoot, 1786) - (CARDIIDAE)
- maculatum, Acrosterigma maculatum G.B. I Sowerby, 1840 - syn of: Acrosterigma pristipleura (W.H. Dall, 1901) - (CARDIIDAE)
- maculatum, Cochlostoma maculatum A.E.J. Férussac in G. Jan, 1830 - syn of: Cochlostoma septemspiralis (G.de Razoumowsky, 1789) - (COCHLOSTOMATIDAE)
- maculatum, Homalopoma maculatum A.N. Golikov & V.V. Gulbin, 1978 - (COLLONIIDAE)
- maculatum, Steironepion maculatum C.B. Adams, 1850 - syn of: Steironepion maculata (C.B. Adams, 1850) - (COLUMBELLIDAE)
- maculatum, Lentidium maculatum G.J. De Cristofori & G. Jan, 1832 - syn of: Lentidium mediterraneum (A. da Costa, 1830) - (CORBULIDAE)
- maculatum, Leptopoma maculatum (H.C. Lea, 1832) - (CYCLOPHORIDAE)
- maculatum, Epitonium maculatum P.F. Röding, 1798 - syn of: Oxymeris maculata (C. Linnaeus, 1758) - (EPITONIIDAE)
- maculatum, Androgynoceras maculatum A.T. Young & Bird, 1822 † - (LIPAROCERATIDAE) (FOSSIL)
- maculatum, Acanthina maculatum J.E. Gray, 1839 - syn of: Acanthais brevidentata (W. Wood, 1828) - (MURICIDAE)
- maculatum, Sinum maculatum T. Say, 1831 - (NATICIDAE)
- maculatum, Pisidium maculatum W. Dybowski, 1902 - syn of: Pisidium dilatatum C.A. Westerlund, 1897 - (SPHAERIIDAE)
- maculatum, Canarium maculatum (G.B. I Sowerby, 1842) - (STROMBIDAE)
- maculatum, Aylacostoma maculatum (I. Lea, 1832) - (THIARIDAE)
- maculatum, Tonna maculatum J.B.P.A. Lamarck, 1822 - syn of: Tonna tessellata (J.B.P.A. Lamarck, 1816) - (TONNIDAE)
- maculatum, Litharium maculatum (W.H. Pease, 1871) - (TRIPHORIDAE)
- maculatum, Trichotoxon maculatum H.R. Simroth, 1897 - (UROCYCLIDAE)
- maculatum, Cymbium maculatum P.F. Röding, 1798 - syn of: Melo melo (J. Lightfoot, 1786) - (VOLUTIDAE)
- maculatum, Melo maculatum P.F. Röding, 1798 - syn of: Melo melo (J. Lightfoot, 1786) - (VOLUTIDAE)
- maculatum depauperatus, Canarium maculatum depauperatus (P. Dautzenberg & J.L. Bouge, 1933) - (STROMBIDAE)
- maculatus, Krynickillus maculatus J. Kaleniczenko, 1851 - syn of: Limacus maculatus (J. Kaleniczenko, 1851) - (AGRIOLIMACIDAE)
- maculatus, Mesembrinus maculatus H.C. Lea, 1838 - syn of: Mesembrinus semimaculatus H.A. Pilsbry, 1898 - (BULIMULIDAE)
- maculatus, Cranocephalites maculatus (Spath, 1932 †) - (CADOCERATIDAE) (FOSSIL)
- maculatus, Amphidromus maculatus (H.C. Fulton, 1896) - (CAMAENIDAE)
- maculatus, Rhinoclavis maculatus C. Linnaeus, 1758 - syn of: Oxymeris maculata (C. Linnaeus, 1758) - (CERITHIIDAE)
- Maculatus, syn of: Genus Cochlostoma G. Jan, 1830 (COCHLOSTOMATIDAE)
- maculatus, Conus maculatus L.A.G. d'A. Bosc, 1801 - syn of: Harmoniconus sponsalis (C.H. Hwass in J.G. Bruguière, 1792) - (CONIDAE)
- maculatus, Conus maculatus G.B. I Sowerby, 1858 - syn of: Floraconus anemone (J.B.P.A. Lamarck, 1810) - (CONIDAE)
- maculatus, Conus maculatus G. Perry, 1811 - syn of: Conus marmoreus C. Linnaeus, 1758 - (CONIDAE)
- maculatus, Napaeus maculatus S.L. Goodacre, 2006 - (ENIDAE)
- maculatus, Annulobalcis maculatus P.Y. Dgebuadze, A.E. Fedosov & Y.I. Kantor, 2012 - (EULIMIDAE)
- maculatus, Latirus maculatus (L.A. Reeve, 1847) - (FASCIOLARIIDAE)
- maculatus, Limacus maculatus (J. Kaleniczenko, 1851) - (LIMACIDAE)
- maculatus, Malleus maculatus E. Donovan, 1823 - syn of: Malleus albus J.B.P.A. Lamarck, 1819 - (MALLEIDAE)
- maculatus, Murex maculatus A.H. Verrill, 1950 - syn of: Murex carbonnieri (F.P. Jousseaume, 1881) - (MURICIDAE)
- maculatus, Murex maculatus L.A. Reeve, 1845 - syn of: Favartia maculata (L.A. Reeve, 1845) - (MURICIDAE)
- maculatus, Octopus maculatus C.S. Rafinesque, 1814 - syn of: Octopus vulgaris G.L.C.F.D. Cuvier, 1797 - (OCTOPODIDAE)
- maculatus, Plocamopherus maculatus (W.H. Pease, 1860) - (POLYCERIDAE)
- maculatus, Kaloplocamus maculatus (L.S.R. Bergh, 1898) - (POLYCERIDAE)
- maculatus, Spondylus maculatus K. Schreibers, 1793 - syn of: Spondylus nicobaricus K. Schreibers, 1793 - (SPONDYLIDAE)
- maculatus, Strombus maculatus G.B. I Sowerby, 1842 - syn of: Canarium maculatum (G.B. I Sowerby, 1842) - (STROMBIDAE)
- maculatus, Hippopus maculatus J.B.P.A. Lamarck, 1801 - syn of: Hippopus hippopus (C. Linnaeus, 1758) - (TRIDACNIDAE)
- maculatus, Triphora maculatus W.H. Pease, 1871 - syn of: Litharium maculatum (W.H. Pease, 1871) - (TRIPHORIDAE)
- maculatus, Trochus maculatus C. Linnaeus, 1758 - (TROCHIDAE)
- maculatus, Trochus maculatus A. Risso, 1826 - syn of: Calliostoma laugieri (B.C.M. Payraudeau, 1826) - (TROCHIDAE)
- maculatus, Microceramus maculatus (J. Gundlach in L. Pfeiffer, 1865) - (UROCOPTIDAE)
- maculatus bungiensis, Amphidromus maculatus bungiensis H.A. Pilsbry, 1900 - (CAMAENIDAE)
- maculatus concinna, Latirus maculatus concinna C.M. Tapparone-Canefri, 1880 - (FASCIOLARIIDAE)
- maculatus verrucosus, Trochus maculatus verrucosus J.F. Gmelin, 1791 - (TROCHIDAE)
- maculicincta, Ilanga maculicincta D.G. Herbert, 1987 - (SOLARIELLIDAE)
- maculifer, Thordisa maculifer J.J. Risbec, 1956 - syn of: Thordisa villosa (J. Alder & A. Hancock, 1864) - (DISCODORIDIDAE)
- maculifer, Mesafricarion maculifer H.A. Pilsbry, 1919 - (UROCYCLIDAE)
- maculifera, Hemitrochus maculifera (Gutiérrez in F. Poey, 1858) - (CEPOLIDAE)
- maculifera, Mauritia maculifera F.A. Schilder, 1932 - (CYPRAEIDAE)
- maculifera, Mauritia maculifera Erdmann & Lorenz, 2017 - (CYPRAEIDAE)
- maculifera hawaiiensis, Mauritia maculifera hawaiiensis E.L. Heiman, 2005 - (CYPRAEIDAE)
- maculifera martybealsi, Mauritia maculifera martybealsi F.Jr. Lorenz, 2002 - (CYPRAEIDAE)
- maculifera scindata, Mauritia maculifera scindata F.Jr. Lorenz, 2002 - (CYPRAEIDAE)
- maculiferus, Amphidromus maculiferus (G.B. Sowerby, 1838) - (CAMAENIDAE)
- maculiferus, Conus maculiferus G.B. I Sowerby, 1833 - syn of: Purpuriconus magellanicus (C.H. Hwass in J.G. Bruguière, 1792) - (CONIDAE)
- maculiferus, Fusinus maculiferus C.M. Tapparone-Canefri, 1875 - syn of: Fusinus tuberculatus (J.B.P.A. Lamarck, 1822) - (FASCIOLARIIDAE)
- maculiferus, Orthalicus maculiferus (H. Strebel, 1909) - (ORTHALICIDAE)
- maculiferus buluanensis, Amphidromus maculiferus buluanensis P. Bartsch, 1917 - (CAMAENIDAE)
- maculiferus cotabatoensis, Amphidromus maculiferus cotabatoensis P. Bartsch, 1917 - (CAMAENIDAE)
- maculiferus multicolor, Amphidromus maculiferus multicolor O.F. von Möllendorff, 1894 - (CAMAENIDAE)
- maculigera, Dendrodoris maculigera L.S.R. Bergh, 1876 - (DENDRODORIDIDAE)
- maculigera, Thordisa maculigera L.S.R. Bergh, 1877 - (DISCODORIDIDAE)
- maculomarginata, Drillia maculomarginata R.N. Kilburn & P. Stahlschmidt, 2012 - (DRILLIIDAE)
- Maculopeplum, syn of: Genus Scaphella Swainson, 1832 † (VOLUTIDAE) (FOSSIL)
- maculosa, Tornatella maculosa J.P.S. Grateloup, 1828 † - syn of: Acteon punctulatus (A.E.J. Férussac, 1822 †) - (ACTEONIDAE) (FOSSIL)
- maculosa, Iselica maculosa (P.P. Carpenter, 1857) - (AMATHINIDAE)
- maculosa, Arca maculosa L.A. Reeve, 1844 - syn of: Anadara oceanica (R.P. Lesson, 1831) - (ARCIDAE)
- maculosa, Anadara maculosa L.A. Reeve, 1844 - syn of: Anadara oceanica (R.P. Lesson, 1831) - (ARCIDAE)
- maculosa, Babylonia maculosa P.F. Röding, 1798 - syn of: Babylonia areolata (J.H.F. Link, 1807) - (BABYLONIIDAE)
- maculosa, Cominella maculosa (T. Martyn, 1784) - (BUCCINIDAE)
- maculosa, Pisania maculosa J.B.P.A. Lamarck, 1822 - syn of: Pisania striata (J.F. Gmelin, 1791) - (BUCCINIDAE)
- maculosa, Crepidula maculosa T.A. Conrad, 1846 - (CALYPTRAEIDAE)
- maculosa, Cassis maculosa J.F. Gmelin, 1791 - syn of: Cassis tessellata (J.F. Gmelin, 1791) - (CASSIDAE)
- maculosa, Seila maculosa C.F. Laseron, 1951 - (CERITHIOPSIDAE)
- maculosa, Hypselodoris maculosa (W.H. Pease, 1871) - (CHROMODORIDIDAE)
- maculosa, Eatonina maculosa W.F. Ponder, 1965 - (CINGULOPSIDAE)
- maculosa, Pleurotomoides maculosa (W.H. Pease, 1863) - (CLATHURELLIDAE)
- maculosa, Clathurella maculosa W.H. Pease, 1863 - syn of: Pleurotomoides maculosa (W.H. Pease, 1863) - (CLATHURELLIDAE)
- maculosa, Albinaria maculosa (G.P. Deshayes, 1835) - (CLAUSILIIDAE)
- maculosa, Homalopoma maculosa (W.H. Pease, 1868) - (COLLONIIDAE)
- maculosa, Colubraria maculosa J.F. Gmelin, 1791 - syn of: Colubraria muricata (J. Lightfoot, 1786) - (COLUBRARIIDAE)
- maculosa, Strombina maculosa (G.B. I Sowerby, 1832) - (COLUMBELLIDAE)
- maculosa, Spiralta maculosa (I, 1832 †) - (COLUMBELLIDAE) (FOSSIL)
- maculosa, Columbella maculosa W.H. Pease, 1871 - syn of: Pseudamycla dermestoidea (J.B.P.A. Lamarck, 1822) - (COLUMBELLIDAE)
- maculosa, Austromitra maculosa H. Turner & L.R.L. Simone, 1998 - (COSTELLARIIDAE)
- maculosa, Persicula maculosa (L.C. Kiener, 1834) - (CYSTISCIDAE)
- maculosa, Discodoris maculosa L.S.R. Bergh, 1884 - syn of: Tayuva lilacina (A.A. Gould, 1852) - (DISCODORIDIDAE)
- maculosa, Kentrodoris maculosa C.N.E. Eliot, 1906 - syn of: Jorunna funebris (E.F. Kelaart, 1859) - (DISCODORIDIDAE)
- maculosa, Doris maculosa G.L.C.F.D. Cuvier, 1804 - (DORIDIDAE)
- maculosa, Eatoniella maculosa W.F. Ponder, 1965 - syn of: Eatoniella notata W.F. Ponder & E.K. Yoo, 1977 - (EATONIELLIDAE)
- maculosa, Hyaloscala maculosa M. Yokoyama, 1922 - syn of: Epitonium stigmaticum (H.A. Pilsbry, 1911) - (EPITONIIDAE)
- maculosa, Epitonium maculosa M. Yokoyama, 1922 - syn of: Epitonium stigmaticum (H.A. Pilsbry, 1911) - (EPITONIIDAE)
- maculosa, Helicarion maculosa Hyman, Lamborena & Köhler, 2017 - (HELICARIONIDAE)
- maculosa, Aplysiopsis maculosa S. Trinchese, 1874 - syn of: Aplysiopsis elegans (G.P. Deshayes, 1853) - (HERMAEIDAE)
- maculosa, Mactra achatina maculosa J.B.P.A. Lamarck, 1818 - (MACTRIDAE)
- maculosa, Marginella maculosa L.C. Kiener, 1834 - syn of: Persicula maculosa (L.C. Kiener, 1834) - (MARGINELLIDAE)
- maculosa, Mathilda maculosa R. Bieler, 1995 - (MATHILDIDAE)
- maculosa, Neocancilla maculosa (J.F. Gmelin, 1791) - (MITRIDAE)
- maculosa, Strigatella maculosa L.A. Reeve, 1844 - syn of: Mitra litterata J.B.P.A. Lamarck, 1811 - (MITRIDAE)
- maculosa, Favartia maculosa J.C. Melvill & R. Standen, 1899 - syn of: Favartia maculata (L.A. Reeve, 1845) - (MURICIDAE)
- maculosa, Natica maculosa Klipstein, 1843 † - syn of: Fedaiella neritacea (Münster, 1841 †) - (NATICIDAE) (FOSSIL)
- maculosa, Tectonatica maculosa J.B.P.A. Lamarck, 1822 - syn of: Notocochlis tigrina (P.F. Röding, 1798) - (NATICIDAE)
- maculosa, Hapalochlaena maculosa (W.E. Hoyle, 1883) - (OCTOPODIDAE)
- maculosa, Spixia maculosa (A. Doering, 1875) - (ODONTOSTOMIDAE)
- maculosa, Ostrea maculosa Forskål, 1775 - (OSTREIDAE)
- maculosa, Ostrea maculosa P. Forsskål, 1775 - syn of: Gloripallium maculosum (P. Forsskål in C. Niebuhr, 1775) - (OSTREIDAE)
- maculosa, Gari maculosa J.B.P.A. Lamarck, 1818 - (PSAMMOBIIDAE)
- maculosa, Hormospira maculosa (G.B. I Sowerby, 1834) - (PSEUDOMELATOMIDAE)
- maculosa, Pyramidella maculosa J.B.P.A. Lamarck, 1822 - (PYRAMIDELLIDAE)
- maculosa, Raphitoma maculosa T. Høisæter, 2016 - (RAPHITOMIDAE)
- maculosa, Daphnella maculosa W.H. Pease, 1860 - syn of: Daphnella ornata R.B. Hinds, 1844 - (RAPHITOMIDAE)
- maculosa, Raphitoma nivea maculosa F. Nordsieck, 1968 - (RAPHITOMIDAE)
- maculosa, Ervilia maculosa W.H. Dall, 1896 - syn of: Ervilia nitens (G. Montagu, 1808) - (SEMELIDAE)
- maculosa, Inioteuthis maculosa C. Goodrich, 1896 - (SEPIOLIDAE)
- maculosa, Terebra maculosa L. Pfeiffer, 1840 - syn of: Oxymeris maculata (C. Linnaeus, 1758) - (TEREBRIDAE)
- maculosa, Tonna maculosa L.W. Dillwyn, 1817 - syn of: Tonna pennata maculosa L.W. Dillwyn, 1817 - (TONNIDAE)
- maculosa, Tonna maculosa J. Lightfoot, 1786 † - syn of: Malea springi E.J. Petuch, 1989 † - (TONNIDAE) (FOSSIL)
- maculosa, Tonna pennata maculosa L.W. Dillwyn, 1817 - (TONNIDAE)
- maculosa, Aclophoropsis maculosa (C. Hedley, 1903) - (TRIPHORIDAE)
- maculosa, Notosinister maculosa C. Hedley, 1903 - syn of: Aclophoropsis maculosa (C. Hedley, 1903) - (TRIPHORIDAE)
- maculosa, Triphora maculosa C. Hedley, 1903 - syn of: Aclophoropsis maculosa (C. Hedley, 1903) - (TRIPHORIDAE)
- maculosa, Pleurotoma maculosa G.B. I Sowerby, 1834 - syn of: Hormospira maculosa (G.B. I Sowerby, 1834) - (TURRIDAE)
- maculosa, Torrecoptis occulta maculosa C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- maculosa, Lamellaria maculosa L.S.R. Bergh, 1898 - syn of: Lamellaria perspicua (C. Linnaeus, 1758) - (VELUTINIDAE)
- maculosa catiana, Tonna maculosa catiana N.E. Weisbord, 1962 - syn of: Tonna pennata (O.A.L. Mörch, 1853) - (TONNIDAE)
- maculosa elongata, Pisania maculosa elongata P.M. Pallary, 1900 - syn of: Pisania striata (J.F. Gmelin, 1791) - (BUCCINIDAE)
- maculosa fasciata, Pisania maculosa fasciata P.M. Pallary, 1900 - syn of: Pisania striata (J.F. Gmelin, 1791) - (BUCCINIDAE)
- maculosa obesa, Pisania maculosa obesa P.M. Pallary, 1900 - syn of: Pisania striata (J.F. Gmelin, 1791) - (BUCCINIDAE)
- maculosa sulcata, Pyramidella maculosa sulcata A. Adams in G.B. Sowerby, 1854 - (PYRAMIDELLIDAE)
- maculosa tessellata, Pyramidella maculosa tessellata (A. Adams in G.B. Sowerby, 1854) - (PYRAMIDELLIDAE)
- maculospira, Conus maculospira H.A. Pilsbry, 1922 - syn of: Graphiconus inscriptus (L.A. Reeve, 1843) - (CONIDAE)
- maculospira bangladeshianus, Conus maculospira bangladeshianus A.J. Da Motta, 1985 - syn of: Graphiconus inscriptus (L.A. Reeve, 1843) - (CONIDAE)
- maculostriata, Tegula maculostriata (C.B. Adams, 1845) - (TEGULIDAE)
- maculosum, Buccinum maculosum J. Lightfoot, 1786 - (BUCCINIDAE)
- maculosum, Buccinum maculosum L.W. Dillwyn, 1817 - syn of: Tonna pennata maculosa L.W. Dillwyn, 1817 - (BUCCINIDAE)
- maculosum, Buccinum maculosum P.F. Röding, 1798 - syn of: Babylonia areolata (J.H.F. Link, 1807) - (BUCCINIDAE)
- maculosum, Buccinum maculosum J.B.P.A. Lamarck, 1822 - syn of: Pisania striata (J.F. Gmelin, 1791) - (BUCCINIDAE)
- maculosum, Acrosterigma maculosum (W. Wood, 1815) - (CARDIIDAE)
- maculosum, Acrosterigma maculosum G.B. I Sowerby, 1833 - syn of: Acrosterigma pristipleura (W.H. Dall, 1901) - (CARDIIDAE)
- maculosum, Cerithium maculosum L.C. Kiener, 1841 - (CERITHIIDAE)
- maculosum, Cerithium maculosum J.W. Mighels, 1845 - syn of: Cerithium atromarginatum P. Dautzenberg & J.L. Bouge, 1933 - (CERITHIIDAE)
- maculosum, Epitonium maculosum A. Adams & L.A. Reeve, 1850 - syn of: Epitonium glabratum (R.B. Hinds, 1843) - (EPITONIIDAE)
- maculosum, Epitonium maculosum M. Yokoyama, 1922 - syn of: Epitonium stigmaticum (H.A. Pilsbry, 1911) - (EPITONIIDAE)
- maculosum, Gloripallium maculosum (P. Forsskål in C. Niebuhr, 1775) - (PECTINIDAE)
- maculosum howense, Acrosterigma maculosum howense E. Vidal, 1999 - (CARDIIDAE)
- maculosus, Geomalacus maculosus G.J. Allman, 1843 - (ARIONIDAE)
- maculosus, Athoracophorus maculosus D.W. Burton, 1963 - (ATHORACOPHORIDAE)
- maculosus, Drymaeus josephus maculosus E.C. Von Martens, 1893 - (BULIMULIDAE)
- maculosus, Conus maculosus J.P.S. Grateloup, 1835 † - (CONIDAE) (FOSSIL)
- maculosus, Conus maculosus G.B. I Sowerby, 1833 - syn of: Floraconus anemone (J.B.P.A. Lamarck, 1810) - (CONIDAE)
- maculosus, Conus maculosus P.F. Röding, 1798 - syn of: Pionoconus monachus (C. Linnaeus, 1758) - (CONIDAE)
- maculosus, Malleus maculosus L.A. Reeve, 1858 - syn of: Malleus regula (P. Forsskål in C. Niebuhr, 1775) - (MALLEIDAE)
- maculosus, Theodoxus maculosus Gozhik in Gozhik & Datsenko, 2007 † - (NERITIDAE) (FOSSIL)
- maculosus, Cautor maculosus (R.B. Hinds, 1843) - (TRIPHORIDAE)
- maculosus, Verrucarion maculosus G.A. de Mol, 1970 - (UROCYCLIDAE)
- maculosus mcmichaeli, Cautor maculosus mcmichaeli S. Kosuge, 1962 - syn of: Aclophoropsis mcmichaeli (S. Kosuge, 1962) - (TRIPHORIDAE)
- maculosus notabilis, Conus maculosus notabilis M.A. Peyrot, 1930 † - (CONIDAE) (FOSSIL)
- maculosus pallescens, Conus maculosus pallescens G.B. I Sowerby, 1833 - syn of: Floraconus anemone (J.B.P.A. Lamarck, 1810) - (CONIDAE)
- Maculotriton, Genus Maculotriton W.H. Dall, 1904 (MURICIDAE)
- macumba, Cyphoma macumba E.J. Petuch, 1979 - (OVULIDAE)
- macutanicus, Latiaxis macutanicus S. Kosuge, 1979 - syn of: Babelomurex diadema (A. Adams, 1854) - (MURICIDAE)
- macutensis, Praelapeirousia macutensis Sliskovic 1984 † - (RADIOLITIDAE) (FOSSIL)
- Macynoplax, syn of: Genus Notoplax H. Adams, 1861 (ACANTHOCHITONIDAE)
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