- masafuerae, Charopa masafuerae N.H. Odhner, 1921 - (CHAROPIDAE)
- masakadoi, Atilia masakadoi M. Yokoyama, 1922 † - syn of: Mitrella bicincta (A.A. Gould, 1860) - (COLUMBELLIDAE) (FOSSIL)
- masakaense, Pisidium masakaense J.G.J. Kuiper, 1966 - syn of: Pisidium ovampicum C.M.F. Ancey, 1890 - (SPHAERIIDAE)
- masakii, Helicarion masakii J.T. Kuroda, 1960 - (HELICARIONIDAE)
- masamunei, Turbonilla masamunei (S. Nomura, 1936) - (PYRAMIDELLIDAE)
- masamunei, Chemnitzia masamunei S. Nomura, 1936 - syn of: Turbonilla masamunei (S. Nomura, 1936) - (PYRAMIDELLIDAE)
- masaoi, Reinia masaoi T. Habe, 1940 - (CLAUSILIIDAE)
- masaoi, Dentiovula masaoi C.N. Cate, 1973 - (OVULIDAE)
- masapensis, Corbicula masapensis J.H. Kruimel, 1913 - syn of: Corbicula loehensis J.H. Kruimel, 1913 - (CYRENIDAE)
- masapensis, Tylomelania masapensis (J.H. Kruimel, 1913) - (PACHYCHILIDAE)
- masaris, Oliva masaris P.L. Duclos, 1840 - syn of: Miniaceoliva miniacea (P.F. Röding, 1798) - (OLIVIDAE)
- masasensis, Leptoconus masasensis Marks, 1951 † - (CONIDAE) (FOSSIL)
- masatani, Mesolinga masatani Hayami 1961 † - (LUCINIDAE) (FOSSIL)
- masatanii, Ibotrigonia masatanii Kobayashi & Tamura, 1957 † - (MYOPHORELLIDAE) (FOSSIL)
- masatokandai, Megalophaedusa masatokandai H. Minato, 1978 - (CLAUSILIIDAE)
- masatokandai shiroi, Megalophaedusa masatokandai shiroi H. Minato, 1978 - (CLAUSILIIDAE)
- masayana, Turbonilla masayana L.G. Hertlein & A.M. Strong, 1951 - (PYRAMIDELLIDAE)
- masbatensis, Cyclotus masbatensis H.A. Pilsbry, 1928 - (CYCLOPHORIDAE)
- mascaensis, Adiverticula mascaensis M.R. Alonso & C.M. Ibáñez, 1988 - (HELICIDAE)
- mascaensis, Canarivitrina mascaensis (P. Morales, 1987) - (VITRINIDAE)
- mascareignar, Nerita mascareignar C.A. Récluz, 1850 - syn of: Nerita aterrima J.F. Gmelin, 1791 - (NERITIDAE)
- mascareignar, Argonerita mascareignar C.A. Récluz, 1850 - syn of: Nerita aterrima J.F. Gmelin, 1791 - (NERITIDAE)
- mascarellii, Barrancyloceras mascarellii J.J. Vermeulen, 2005 † - syn of: Leroyceras mascarellii J.J. Vermeulen, 2005 † - (CRIOCERATITIDAE) (FOSSIL)
- mascarellii, Leroyceras mascarellii J.J. Vermeulen, 2005 † - (HEMIHOPLITIDAE) (FOSSIL)
- mascarellii, Rouchadzeites mascarellii (Delanoy & Ebbo, 2000 †) - (HETEROCERATIDAE) (FOSSIL)
- mascarellii, Heteroceras mascarellii Delanoy & Ebbo, 2000 † - syn of: Rouchadzeites mascarellii (Delanoy & Ebbo, 2000 †) - (HETEROCERATIDAE) (FOSSIL)
- Mascarellina, Genus Mascarellina Vermeulen, 2009 (ANAHAMULINIDAE) (FOSSIL)
- mascarellyi, Cernuella mascarellyi E. Caziot, 1910 - syn of: Cernuella virgata (E.M. Da Costa, 1778) - (HYGROMIIDAE)
- mascarena, Oliva mascarena B. Tursch & D. Greifeneder, 1996 - syn of: Oliva pica J.B.P.A. Lamarck, 1811 - (OLIVIDAE)
- mascarenarum, Cerithium mascarenarum W. Kobelt, 1893 - syn of: Cerithideopsis pliculosa (K.T. Menke, 1829) - (CERITHIIDAE)
- mascarenasi, Xerocrassa mascarenasi P. Fagot, 1888 - syn of: Amandana ripacurcica (A. Bofill, 1886) - (HYGROMIIDAE)
- mascarenensis, Mendax mascarenensis M. Jay & J. Drivas, 2002 - (CERITHIOPSIDAE)
- mascarenensis, Dianadema mascarenensis P.G. Oliver & A.M. Holmes, 2004 - syn of: Dianadema minima (G.B. III Sowerby, 1889) - (CLAVAGELLIDAE)
- mascarenensis, Pyreneola mascarenensis J. Drivas & M. Jay, 1990 - (COLUMBELLIDAE)
- mascarensis, Sepia mascarensis Y.A. Filippova & D.N. Khromov, 1991 - (SEPIIDAE)
- Mascaria, syn of: Genus Hainesia L. Pfeiffer, 1856 (MEGALOMASTOMIDAE)
- mascei, Cochlostoma mascei J.R. Bourguignat, 1869 - syn of: Cochlostoma macei (J.R. Bourguignat, 1869) - (COCHLOSTOMATIDAE)
- masciadrii, Furloceras masciadrii (Pelosio 1968 †) - (PHYMATOCERATIDAE) (FOSSIL)
- masckei, Clinoceras masckei Dewitz, 1880 † - (CLINOCERATIDAE) (FOSSIL)
- Masckeites, Genus Masckeites Buckman, 1920 (MOLLUSCA INCERTAE SEDIS) (FOSSIL)
- masclaryana, Pupilla masclaryana O. Böttger, 1889 - syn of: Pupilla muscorum (C. Linnaeus, 1758) - (PUPILLIDAE)
- Masculuconus, Genus Masculuconus Feng & al., 2000 (CERATOCONIDAE) (FOSSIL)
- Masculus, syn of: Genus Sonorella H.A. Pilsbry, 1900 (HELMINTHOGLYPTIDAE)
- maseninovi, Paranowakia maseninovi Lyashenko, 1969 † - (PARANOWAKIIDAE) (FOSSIL)
- maseruensis, Microkerkus maseruensis (Connolly, 1929) - (UROCYCLIDAE)
- mashikensis, Acanthotrigonia mashikensis Tamura & Tashiro, 1967 † - (PTEROTRIGONIIDAE) (FOSSIL)
- mashkovae, Poleumita mashkovae Kurushin, 1986 † - (EUOMPHALIDAE) (FOSSIL)
- Masiaposites, Genus Masiaposites (AMMONOIDEA (UNASSIGNED)) (FOSSIL)
- masiasi, Tegula masiasi DeVries, 2007 † - (TEGULIDAE) (FOSSIL)
- masier, Thylacodes masier (G.P. Deshayes, 1843) - (VERMETIDAE)
- masinguiensis, Crommium masinguiensis Clark & J.W. Durham, 1946 † - (AMPULLINIDAE) (FOSSIL)
- masinguiensis, Tellina masinguiensis Clark & J.W. Durham, 1946 † - (TELLINIDAE) (FOSSIL)
- masinguiensis, Turritella masinguiensis Clark & J.W. Durham, 1946 † - (TURRITELLIDAE) (FOSSIL)
- masinoi, Conasprella masinoi (E.J. Petuch, D.P. Berschauer & Poremski, 2016) - (CONIDAE)
- masinoi, Splendrillia masinoi P.J. Fallon, 2016 - (DRILLIIDAE)
- masinoi, Crassispira masinoi P.J. Fallon, 2011 - (PSEUDOMELATOMIDAE)
- masirahensis, Hastulopsis masirahensis Terryn & Rosado, 2016 - (TEREBRIDAE)
- masirana, Persicula masirana B. Roth & R.E. Petit, 1972 - (CYSTISCIDAE)
- masirana, Demissa masirana F. Boyer, 2016 - (MARGINELLIDAE)
- masirensis, Conomurex decorus masirensis R.G. Moolenbeek & H. Dekker, 1993 - (STROMBIDAE)
- masisiensis, Paucidentina masisiensis H.A. Pilsbry, 1919 - (STREPTAXIDAE)
- masisiensis, Pseudoglessula intermedia masisiensis H.A. Pilsbry, 1919 - (SUBULINIDAE)
- maskatensis, Tucetona maskatensis J.C. Melvill, 1897 - syn of: Tucetona guesi (F.P. Jousseaume, 1895) - (GLYCYMERIDIDAE)
- maskatensis, Glycymeris maskatensis J.C. Melvill, 1897 - syn of: Tucetona guesi (F.P. Jousseaume, 1895) - (GLYCYMERIDIDAE)
- maskelynensis, Cystiscus maskelynensis A. Wakefield & T. McCleery, 2006 - (CYSTISCIDAE)
- maslennikovi, Palaeomutela maslennikovi Kanev † - (PALAEOMUTELIDAE) (FOSSIL)
- maslennikovi, Francisciconcha maslennikovi C. Little & al., 2004 † - (TROCHIDAE) (FOSSIL)
- masoala, Succinea masoala K.C. Emberton & R.J. Griffiths, 2009 - (SUCCINEIDAE)
- masoalae, Gulella masoalae K.C. Emberton, 2001 - (STREPTAXIDAE)
- masoni, Penion masoni (C.A. Fleming, 1943 †) - (BUCCINIDAE) (FOSSIL)
- masoni, Austrosipho masoni C.A. Fleming, 1943 † - syn of: Penion masoni (C.A. Fleming, 1943 †) - (BUCCINIDAE) (FOSSIL)
- masoni, Amphidromus masoni (H.H. Godwin-Austen, 1876) - (CAMAENIDAE)
- masoni, Clathurella masoni G. Nevill & H. Nevill, 1875 - (CLATHURELLIDAE)
- masoni, Indonenia masoni (W. Theobald, 1864) - (CLAUSILIIDAE)
- masoni, Conus masoni G. Nevill & H. Nevill, 1874 - syn of: Tesselliconus caracteristicus (G. Fischer von Waldheim, 1807) - (CONIDAE)
- masoni, Gadilina masoni P.A. Maxwell, 1992 † - (GADILINIDAE) (FOSSIL)
- masoni, Otapiria masoni J. Marwick, 1953 † - (MONOTIDAE) (FOSSIL)
- masoni, Bayerotrochus masoni (P.A. Maxwell, 1978 †) - (PLEUROTOMARIIDAE) (FOSSIL)
- masoni, Dombarocanites masoni W.J. Gordon, 1964 † - (PROLECANITIDAE) (FOSSIL)
- masoni, Tellina masoni R. Tate, 1887 † - (TELLINIDAE) (FOSSIL)
- masoni, Fusconaia masoni (T.A. Conrad, 1834) - (UNIONIDAE)
- Masonites, Genus Masonites Henderson, 1970 (AMMONOIDEA (UNASSIGNED)) (FOSSIL)
- Masonoceras, Genus Masonoceras Work & Manger, 2002 (KARAGANDOCERATIDAE) (FOSSIL)
- massa, Lyrodus massa (É. Lamy, 1923) - (TEREDINIDAE)
- massae, Rupestrella homala massae J. Beckmann, 2002 - (CHONDRINIDAE)
- Massaihelix, syn of: Genus Psichion G.P.L.K. Gude, 1911 (ENDODONTIDAE)
- massambabense, Caecum massambabense R.S. Absalão, 1994 - (CAECIDAE)
- massambabensis, Caecum massambabensis R.S. Absalão, 1994 - syn of: Caecum massambabense R.S. Absalão, 1994 - (CAECIDAE)
- massarita, Vitrinella massarita W.H. Dall, 1927 - (TORNIDAE)
- massauense, Ennea massauense K.H.J. Thiele, 1933 - (STREPTAXIDAE)
- massauensis, Mauritia arabica massauensis F.A. Schilder, 1922 - (CYPRAEIDAE)
- massauensis, Melampus massauensis L. Pfeiffer, 1858 - (ELLOBIIDAE)
- massauensis, Syrnola massauensis (C. Linnaeus, 1758) - (PYRAMIDELLIDAE)
- masseanum, Tropidoceras masseanum (A.V.M.D. D'Orbigny, 1844 †) - (POLYMORPHITIDAE) (FOSSIL)
- masseanum rotundum, Tropidoceras masseanum rotundum (Futterer, 1893 †) - (POLYMORPHITIDAE) (FOSSIL)
- massei, Pseudocrioceras massei Ropolo & Gonnet, 1999 † - (ANCYLOCERATIDAE) (FOSSIL)
- massei, Eosolarium massei A.L. Chavan, 1947 † - (ARCHITECTONICIDAE) (FOSSIL)
- massei, Caprina massei Alencaster & Pantoja-Alor 1995 † - (CAPRINIDAE) (FOSSIL)
- massemini, Dauciconus massemini (E. Monnier & L. Limpalaër, 2016) - (CONIDAE)
- massemini, Favartia massemini D. Merle & B. Garrigues, 2008 - (MURICIDAE)
- massena, Leptopoma massena (R.P. Lesson, 1830) - (CYCLOPHORIDAE)
- massena, Murex massena S. Delle Chiaje, 1841 - syn of: Chauvetia lineolata (N. Tiberi, 1868) - (MURICIDAE)
- massenae, Cypraecassis massenae L.C. Kiener, 1835 - syn of: Cypraecassis tenuis (Wood, 1828) - (CASSIDAE)
- masseneti, Eulima masseneti L. de Folin, 1867 - syn of: Eulima fulvocincta C.B. Adams, 1850 - (EULIMIDAE)
- massesylica, Atlasica massesylica P.M. Pallary - (HELICIDAE)
- massiei, Camaena massiei (L.J. Morlet, 1891) - (CAMAENIDAE)
- massiei, Clausilia massiei L.J. Morlet, 1892 - (CLAUSILIIDAE)
- massiei, Dreissena massiei L.J. Morlet, 1892 - syn of: Sinomytilus harmandi (A. de Rochebrune, 1881) - (DREISSENIDAE)
- massiei, Helix massiei L.J. Morlet, 1891 - syn of: Camaena massiei (L.J. Morlet, 1891) - (HELICIDAE)
- massiei, Calybium massiei L.J. Morlet, 1891 - (HELICINIDAE)
- massiei, Lacunopsis massiei A.R.J.B. Bavay, 1895 - (POMATIOPSIDAE)
- massieri, Afrozoila fultoni massieri (F.Jr. Lorenz, 1991) - (CYPRAEIDAE)
- massieri, Cosmetalepas massieri G.T. Poppe, S.P. Tagaro & J. Sarino, 2011 - (FISSURELLIDAE)
- massieri, Triviella massieri (P. Martin & G.T. Poppe, 1991) - (TRIVIIDAE)
- massieri, Gibbula massieri E. Rolán & M.L. Zettler, 2010 - (TROCHIDAE)
- massieri, Bolma massieri L. Bozzetti, 1992 - (TURBINIDAE)
- massierorum, Naviculavolva massierorum (D. Fehse, 1999) - (OVULIDAE)
- massiliae, Giovaraites massiliae Frau & al., 2016 † - (HETEROCERATIDAE) (FOSSIL)
- massiliense, Cerithium massiliense É.A.A. Locard, 1886 - syn of: Cerithium lividulum A. Risso, 1826 - (CERITHIIDAE)
- massimilianoi, Joculator massimilianoi A. Cecalupo & I. Perugia, 2012 - (CERITHIOPSIDAE)
- massini, Leptoconchus massini E. Gittenberger & A. Gittenberger, 2011 - (MURICIDAE)
- massipiana, Choffaticeras massipiana Pervinquiére, 1907 † - (PSEUDOTISSOTIIDAE) (FOSSIL)
- massoni, Bocageia massoni (J.C.H. Crosse, 1868) - (SUBULINIDAE)
- massoti, Moitessieria massoti J.R. Bourguignat, 1863 - (MOITESSIERIIDAE)
- massoti, Costatella massoti Penchinat in É.A.A. Locard, 1893 - syn of: Physella acuta (J.P.R. Draparnaud, 1805) - (PHYSIDAE)
- massoti, Punctum massoti J.R. Bourguignat, 1863 - syn of: Punctum pygmaeum (J.P.R. Draparnaud, 1801) - (PUNCTIDAE)
- Massotia, syn of: Genus Alvania A. Risso, 1826 (RISSOIDAE)
- massotiana, Chondrina massotiana J.R. Bourguignat, 1863 - syn of: Chondrina farinesii C. des Moulins, 1835 - (CHONDRINIDAE)
- massotiana sexplicata, Chondrina massotiana sexplicata A. Bofill, 1886 - syn of: Chondrina farinesii sexplicata A. Bofill, 1886 - (CHONDRINIDAE)
- Massotiella, syn of: Genus Alvania A. Risso, 1826 (RISSOIDAE)
- massui, Pyrgiscus massui (E. Saurin, 1959) - (PYRAMIDELLIDAE)
- Massya, Genus Massya A. Pruvot-Fol, 1924 (CLIONIDAE)
- massyae, Bolitaena massyae (G.C. Robson, 1924) - (BOLITAENIDAE)
- massyae, Cirroteuthis massyae G.J. Von Grimpe, 1920 - (CIRROTEUTHIDAE)
- massyae, Eledone massyae N.A. Voss, 1964 - (OCTOPODIDAE)
- massyae, Opisthoteuthis massyae (G.J. Von Grimpe, 1920) - (OPISTHOTEUTHIDAE)
- massyae, Pholidoteuthis massyae G.J. Pfeffer, 1912 - syn of: Tetronychoteuthis dussumieri (A.V.M.D. D'Orbigny, 1839) - (PHOLIDOTEUTHIDAE)
- massyae purpurea, Bolitaena massyae purpurea (C.W. Robson, 1930) - (BOLITAENIDAE)
- massyae purpurea, Eledonella massyae purpurea C.W. Robson, 1930 - syn of: Bolitaena massyae purpurea (C.W. Robson, 1930) - (BOLITAENIDAE)
- Massyla, Subgenus Cancellaria (Massyla) H. Adams & A. Adams, 1854 (CANCELLARIIDAE)
- Massylaea, Subgenus Iberus (Massylaea) O.F. von Mφllendorff, 1898 (HELICIDAE)
- massylaea, Iberus massylaea (P.M.A. Morelet, 1851) - (HELICIDAE)
- Mastakhella, Genus Mastakhella Missarzhevsky , 1989 (CARINOPELTIDAE) (FOSSIL)
- mastalleri, Acanthochitona mastalleri H.L. Strack, 1989 - (ACANTHOCHITONIDAE)
- mastersi, Tornatellinops mastersi (J.W. Brazier, 1876) - (ACHATINELLIDAE)
- mastersi, Achatinella mastersi W. Newcomb - syn of: Amastra mastersi (W. Newcomb, 1854) - (ACHATINELLIDAE)
- mastersi, Amastra mastersi (W. Newcomb, 1854) - (AMASTRIDAE)
- mastersi, Bothriembryon mastersi (J.C. Cox, 1867) - (BOTHRIEMBRYONTIDAE)
- mastersi, Bulimus mastersi J.C. Cox, 1867 - syn of: Bothriembryon mastersi (J.C. Cox, 1867) - (BULIMULIDAE)
- mastersi, Badistes mastersi J.C. Cox, 1864 - (CAMAENIDAE)
- mastersi, Mystivagor mastersi (J.W. Brazier, 1872) - (CHAROPIDAE)
- mastersi, Helicarion mastersi J.C. Cox, 1868 - (HELICARIONIDAE)
- mastersi, Partula gibba mastersi L. Pfeiffer, 1857 - (PARTULIDAE)
- mastersi, Inquisitor mastersi (J.W. Brazier, 1876) - (PSEUDOMELATOMIDAE)
- mastersi callidus, Helicarion mastersi callidus T. Iredale, 1941 - (HELICARIONIDAE)
- Mastigeulota, Subgenus Bradybaena (Mastigeulota) H.A. Pilsbry, 1895 (BRADYBAENIDAE)
- Mastigoceras, syn of: Genus Mastigohamites Breistroffer, 1947 (PTYCHOCERATIDAE) (FOSSIL)
- Mastigohamites, Genus Mastigohamites Breistroffer, 1947 (PTYCHOCERATIDAE) (FOSSIL)
- Mastigophallus, Genus Mastigophallus P. Hesse, 1918 (TRISSEXODONTIDAE)
- Mastigophora, Genus Mastigophora Owen, 1856 (MASTIGOPHORIDAE) (FOSSIL)
- mastigophora, Austrorossia mastigophora (C. Chun, 1915) - (SEPIOLIDAE)
- MASTIGOPHORIDAE Engeser & Reitner, 1985 - Family (CEPHALOPODA-COLEOIDEA [Subclass]-DECAPODIFORMES [Superorder]-LOLIGOSEPIIDA [Order]) (FOSSIL)
- Mastigospira, Genus Mastigospira La Rocque, 1949 (EUOMPHALIDAE) (FOSSIL)
- MASTIGOTEUTHIDAE Verrill, 1881 - Family (CEPHALOPODA-COLEOIDEA [Subclass]-DECAPODIFORMES [Superorder]-OEGOPSIDA [Order])
- Mastigoteuthis, Genus Mastigoteuthis A.E. Verrill, 1881 (MASTIGOTEUTHIDAE)
- Mastoceras, Genus Mastoceras Jun-Yuan & Teichert, 1983 (PROTACTINOCERATIDAE) (FOSSIL)
- mastodontofila, Triptychia mastodontofila (Sismonda, 1852) † - (FILHOLIIDAE) (FOSSIL)
- Mastogyra, syn of: Genus Amphibulima J.B.P.A. Lamarck, 1805 (AMPHIBULIMIDAE)
- Mastoides, Genus Mastoides C.A. Westerlund, 1896 (ENIDAE)
- Mastonia, Genus Mastonia R.B. Hinds, 1843 (TRIPHORIDAE)
- Mastoniaeforis, Genus Mastoniaeforis F.P. Jousseaume, 1884 (TRIPHORIDAE)
- Mastoniaeformis, syn of: Genus Mastoniaeforis F.P. Jousseaume, 1884 (TRIPHORIDAE)
- mastrichtiensis, Dosinia mastrichtiensis E.F. de Vogel, 1895 † - (VENERIDAE) (FOSSIL)
- Mastula, Subgenus Leiostyla (Mastula) R.T. Lowe, 1852 (LAURIIDAE)
- Mastus, Genus Mastus H.H. Beck, 1837 (ENIDAE)
- mastykensis, Parinyoites mastykensis A.M. Popov, 1962 † - syn of: Subvishnuites welteri Spath, 1930 † - (INYOITIDAE) (FOSSIL)
- masudae, Fulgoraria masudae I. Hayasaka † - (VOLUTIDAE) (FOSSIL)
- masuhowaruensis, Pupinella masuhowaruensis Y.T. Ueng & Chiou, 2004 - (PUPINIDAE)
- mata, Parvamussium mata P.A. Maxwell, 1992 † - (PROPEAMUSSIIDAE) (FOSSIL)
- mataderorum, Turbonilla mataderorum A. Peñas & E. Rolán, 2010 - (PYRAMIDELLIDAE)
- matadina, Gabbiella matadina G. Mandahl-Barth, 1968 - (BITHYNIIDAE)
- matadoa, Gastrana matadoa (J.F. Gmelin, 1791) - (TELLINIDAE)
- matafaoi, Diastole matafaoi unknown - (EUCONULIDAE)
- matagalpensis, Tristramia rostrata matagalpensis A.J. Wagner, 1910 - (HELICINIDAE)
- matai, Semicassis matai A.W.B. Powell, 1952 - syn of: Semicassis pyrum (J.B.P.A. Lamarck, 1822) - (CASSIDAE)
- matai, Perrierina matai C.A. Fleming, 1948 - (CYAMIIDAE)
- matai, Lironoba matai R.K. Dell, 1952 - (RISSOIDAE)
- matajiroi, Buccinum matajiroi J. Makiyama, 1959 † - (BUCCINIDAE) (FOSSIL)
- matajiroi, Crepidula matajiroi J. Makiyama, 1957 † - (CALYPTRAEIDAE) (FOSSIL)
- matajiroi, Opalia matajiroi (J.T. Kuroda, 1954) - (EPITONIIDAE)
- matakuana, Eucithara matakuana E.A. Smith, 1884 - syn of: Eucithara delacouriana matakuana (E.A. Smith, 1884) - (MANGELIIDAE)
- matakuana, Cythara matakuana E.A. Smith, 1884 - syn of: Eucithara delacouriana (J.C.H. Crosse, 1869) - (MANGELIIDAE)
- matakuana, Eucithara delacouriana matakuana (E.A. Smith, 1884) - (MANGELIIDAE)
- matakuana, Daphnella matakuana E.A. Smith, 1884 - syn of: Eucithara delacouriana (J.C.H. Crosse, 1869) - (RAPHITOMIDAE)
- matanense, Pleuronodoceras matanense J.K. Zhao & al., 1978 † - (PLEURONODOCERATIDAE) (FOSSIL)
- matanensis, Retispira matanensis Pan & Yu, 1993 † - (KNIGHTITIDAE) (FOSSIL)
- matanensis, Hyphantozyga matanensis Pan & Yu, 1993 † - (PSEUDOZYGOPLEURIDAE) (FOSSIL)
- matannensis, Corbicula matannensis P.B. Sarasin & K.F. Sarasin, 1898 - (CYRENIDAE)
- matannensis, Tylomelania matannensis T. von Rintelen, P. Bouchet & M. Glaubrecht, 2007 - (PACHYCHILIDAE)
- matanzana, Olivancillaria matanzana C. Nielsen, 2004 † - (OLIVIDAE) (FOSSIL)
- matanzana, Fagnastesia matanzana C. Nielsen & al., 2004 † - (TROCHIDAE) (FOSSIL)
- matanzensis, Chlorostoma matanzensis C. Nielsen & al., 2004 † - (TEGULIDAE) (FOSSIL)
- Matanziella, Subgenus Miltha (Matanziella) Frassinetti, 1978 (LUCINIDAE) (FOSSIL)
- matapango, Catapyrgus matapango M. Haase, 2008 - (HYDROBIIDAE)
- matapuana, Indotrigonia matapuana (Krenkel, 1911) † - (TRIGONIIDAE) (FOSSIL)
- matara, Cerithiopsis matara W.H. Dall, 1889 - (CERITHIOPSIDAE)
- matara, Dentalium matara W.H. Dall, 1889 - (DENTALIIDAE)
- matara, Seguenzia matara B.A. Marshall, 1988 - (SEGUENZIIDAE)
- matarua, Kokopapa matarua F.M. Climo & Mahlfeld, 2011 - (PUNCTIDAE)
- matarucana, Anadara veatchi matarucana F. Hodson & al., 1927 - (ARCIDAE)
- matarucana, Turritella matarucana F. Hodson, 1926 † - (TURRITELLIDAE) (FOSSIL)
- Matata, syn of: Genus Partula A.E.J. Fιrussac, 1821 (PARTULIDAE)
- matauensis, Asthenothaerus matauensis (Finlay & J. Marwick, 1937 †) - (THRACIIDAE) (FOSSIL)
- matauensis, Tropicolpus matauensis (Finlay & J. Marwick, 1937 †) - (TURRITELLIDAE) (FOSSIL)
- matavai, Trivirostra matavai D. Fehse & J. Grego, 2013 - (TRIVIIDAE)
- matavera, Minidonta matavera F.J. Brook, 2010 - (ENDODONTIDAE)
- matavymolotra, Gulella matavymolotra K.C. Emberton, 2002 - (STREPTAXIDAE)
- matawanensis, Paryphantopsis matawanensis J. Slapcinsky, 2005 - (CHAROPIDAE)
- Mataxa, Genus Mataxa B. Wade, 1917 (CANCELLARIIDAE) (FOSSIL)
- matchacheepiorum, Alycaeus matchacheepiorum P. Dumrongrojwattana & W.J.M. Maassen, 2008 - (CYCLOPHORIDAE)
- matchetti, Americoliva matchetti E.J. Petuch & R.F. Myers, 2014 - (OLIVIDAE)
- matchetti, Scaphella matchetti E.J. Petuch & D.M. Sargent, 2011 - (VOLUTIDAE)
- matchgarense, Buccinum matchgarense J. Makiyama, 1935 - (BUCCINIDAE)
- matchgarense, Ciliatocardium matchgarense (J. Makiyama, 1934 †) - (CARDIIDAE) (FOSSIL)
- matchgarensis, Modiolus matchgarensis (J. Makiyama, 1934 †) - (MYTILIDAE) (FOSSIL)
- matchgarensis, Chlamys matchgarensis J. Makiyama, 1934 † - (PECTINIDAE) (FOSSIL)
- mateana, Monilea mateana H.S. Ladd, 1934 † - (TROCHIDAE) (FOSSIL)
- matecumbensis, Liguus fasciatus matecumbensis H.A. Pilsbry, 1912 - (ORTHALICIDAE)
- matejici, Kosovia matejici (P.S. Pavlovic, 1931 †) - (VIVIPARIDAE) (FOSSIL)
- matejkoi, Phaedusa matejkoi Hunyadi & Szekeres, 2016 - (CLAUSILIIDAE)
- matejkoi, Phaedusa elisabethae matejkoi J. Grego & M. Szekeres, 2011 - (CLAUSILIIDAE)
- matensis, Trochactaeon matensis Fittipaldi, 1900 † - (ACTEONELLIDAE) (FOSSIL)
- mateoi, Helicostyla mateoi P. Bartsch, 1932 - (BRADYBAENIDAE)
- mateoi sibolonensis, Helicostyla mateoi sibolonensis P. Bartsch, 1932 - (BRADYBAENIDAE)
- mater, Stylonema mater J. Perner, 1907 † - (LOXONEMATIDAE) (FOSSIL)
- mater, Litorhadia mater (Meyer, 1885 †) - (NUCULANIDAE) (FOSSIL)
- mater, Yoldia mater Meyer, 1885 † - (YOLDIIDAE) (FOSSIL)
- matercula, Dermomurex matercula E.H. Vokes, 1975 † - (MURICIDAE) (FOSSIL)
- matercula, Neritaria matercula (F.A. von Quenstedt, 1884 †) - (NERITARIIDAE) (FOSSIL)
- matercula, Ostrea matercula de Verneuil, 1845 † - syn of: Pseudomonotis speluncaria (von Schlotheim, 1816 †) - (OSTREIDAE) (FOSSIL)
- Matercula, syn of: Genus Maminka Barrande, 1881 (STOLIDOTIDAE) (FOSSIL)
- materinsulae, Rissoina materinsulae H.A. Pilsbry, 1904 - (RISSOINIDAE)
- materinum, Tylostoma materinum White, 1887 † - (TYLOSTOMATIDAE) (FOSSIL)
- matermontana, Linisia matermontana (H.A. Pilsbry, 1896) - (POLYGYRIDAE)
- matermontana jaliscoensis, Linisia matermontana jaliscoensis (H.A. Pilsbry, 1910) - (POLYGYRIDAE)
- materna, Nisiturris materna J.C. Melvill, 1912 - (PYRAMIDELLIDAE)
- materna, Thysanophora materna W.H. Dall, 1926 - (THYSANOPHORIDAE)
- materna, Proxichione materna T. Iredale, 1929 - (VENERIDAE)
- maternae, Olivula staminea maternae (K.V.W. Palmer, 1937 †) - (ANCILLARIIDAE) (FOSSIL)
- materniacus, Unio materniacus É.A.A. Locard, 1889 - syn of: Unio arcuatus N.R. Bouchard-Chantereaux, 1838 - (UNIONIDAE)
- Maternoceras, Genus Maternoceras Clausen, 1969 (GEPHUROCERATIDAE) (FOSSIL)
- Matherella, Genus Matherella Walcott, 1912 (ONYCHOCHILIDAE) (FOSSIL)
- Matherellina, Genus Matherellina Kobayashi, 1933 (ONYCHOCHILIDAE) (FOSSIL)
- Matherena, syn of: Genus Favorinus M.E. Gray, 1850 (FACELINIDAE)
- matheri, Xenoceltites matheri (Mathews, 1929 †) - (KASHMIRITIDAE) (FOSSIL)
- matheri, Strophostylus matheri J.W. Hall, 1859 † - (PLATYCERATIDAE) (FOSSIL)
- matheri, Leptodesma matheri Elias, 1957 † - (PTERINEIDAE) (FOSSIL)
- matheri, Gordonites matheri W.J. Gordon, 1964 † - (THALASSOCERATIDAE) (FOSSIL)
- Matheria, Genus Matheria Billings, 1858 (MATHERIIDAE) (FOSSIL)
- MATHERIIDAE Scarlato & Starobogatov, 1979 - Family (BIVALVIA-PTERIOMORPHIA [Subclass]-LIMIDA [Order]-LIMOIDEA [Superfamily]) (FOSSIL)
- matheroni, Crioceras matheroni A.V.M.D. D'Orbigny † - syn of: Aegocrioceras bicarinatum (A.T. Young & Bird, 1828 †) - (AEGOCRIOCERATIDAE) (FOSSIL)
- matheroni, Babylonia matheroni Magne, 1942 † - (BABYLONIIDAE) (FOSSIL)
- matheroni, Venericardia matheroni (C. Mayer, 1871 †) - (CARDITIDAE) (FOSSIL)
- matheroni, Pseudohaploceras matheroni (A.V.M.D. D'Orbigny, 1840 †) - (DESMOCERATIDAE) (FOSSIL)
- matheroni, Harpagodes matheroni Charles, 1946 † - (HARPAGODIDAE) (FOSSIL)
- matheroni, Melanopsis matheroni C. Mayer, 1871 † - syn of: Melanopsis narzolina d'Archiac in Viquesnel, 1846 † - (MELANOPSIDAE) (FOSSIL)
- matheroni, Anisus matheroni (Fischer & J.R. Tournouër, 1873) - (PLANORBIDAE)
- matheroni, Toucasia matheroni (Coquand, 1862 †) - (REQUIENIIDAE) (FOSSIL)
- matheroni, Omalonyx matheroni (V.L.V. Potiez & A. Michaud, 1835) - (SUCCINEIDAE)
- matheroni agatensis, Melanopsis matheroni agatensis D. Pantanelli, 1886 † - syn of: Melanopsis narzolina d'Archiac in Viquesnel, 1846 † - (MELANOPSIDAE) (FOSSIL)
- matheroni doderleini, Melanopsis matheroni doderleini D. Pantanelli, 1886 † - syn of: Melanopsis narzolina d'Archiac in Viquesnel, 1846 † - (MELANOPSIDAE) (FOSSIL)
- matheroni ecarinata, Melanopsis matheroni ecarinata C.F. Fontannes, 1880 † - syn of: Melanopsis narzolina d'Archiac in Viquesnel, 1846 † - (MELANOPSIDAE) (FOSSIL)
- Matheronia, Genus Matheronia Munier-Chalmas, 1873 (REQUIENIIDAE) (FOSSIL)
- matheroniana, Exogyra matheroniana A.V.M.D. D'Orbigny, 1847 † - (GRYPHAEIDAE) (FOSSIL)
- matheroniana, Hastula matheroniana (G.P. Deshayes, 1859) - (TEREBRIDAE)
- matheroniana, Terebra matheroniana G.P. Deshayes, 1859 - syn of: Hastula matheroniana (G.P. Deshayes, 1859) - (TEREBRIDAE)
- matheronianum, Ancyloceras matheronianum A.V.M.D. D'Orbigny, 1842 † - (ANCYLOCERATIDAE) (FOSSIL)
- matheronianum derognati, Ancyloceras matheronianum derognati G.F. Roch, 1927 † - (ANCYLOCERATIDAE) (FOSSIL)
- matheronianum moreti, Ancyloceras matheronianum moreti G.F. Roch, 1927 † - (ANCYLOCERATIDAE) (FOSSIL)
- Matheronites, Genus Matheronites Renngarten , 1926 (HEMIHOPLITIDAE) (FOSSIL)
- Mathesia, Genus Mathesia Mainelli, 1995 (MONOPLEURIDAE) (FOSSIL)
- mathesonensis, Haliotis mathesonensis (Eagle, 1996 †) - (HALIOTIDAE) (FOSSIL)
- mathewsi, Penescosta mathewsi (H.B. Preston, 1913) - (CHAROPIDAE)
- mathewsi, Microcystis mathewsi H.B. Preston, 1913 - (EUCONULIDAE)
- mathewsi, Helicarion mathewsi H.B. Preston, 1913 - (HELICARIONIDAE)
- mathewsi, Lyelliceras mathewsi Knechtel, 1947 † - syn of: Prolyelliceras mathewsi (Knechtel, 1947 †) - (LYELLICERATIDAE) (FOSSIL)
- mathewsi, Prolyelliceras mathewsi (Knechtel, 1947 †) - (PROLYELLICERATIDAE) (FOSSIL)
- Mathewsoconcha, Genus Mathewsoconcha H.B. Preston, 1913 (HELICARIONIDAE)
- mathewsoni, Crenomytilus mathewsoni (W.M. Gabb, 1869 †) - (MYTILIDAE) (FOSSIL)
- mathewsoni, Haplocion mathewsoni P. Bartsch, 1942 - (UROCOPTIDAE)
- mathewsoni, Amiantis mathewsoni (W.M. Gabb, 1866 †) - (VENERIDAE) (FOSSIL)
- mathewsonii, Aturoidea mathewsonii (W.M. Gabb, 1864 †) - (HERCOGLOSSIDAE) (FOSSIL)
- mathewsonii, Petromactra mathewsonii (W.M. Gabb, 1864 †) - (MACTRIDAE) (FOSSIL)
- mathewsonii, Lupunovula mathewsonii Unknown Author † - (OVULIDAE) (FOSSIL)
- mathewsonii, Tellina mathewsonii W.M. Gabb, 1864 † - syn of: Petromactra mathewsonii (W.M. Gabb, 1864 †) - (TELLINIDAE) (FOSSIL)
- matheyi, Purpuroidea matheyi Loriol, 1889 † - (PURPUROIDEIDAE) (FOSSIL)
- mathieui, Proterocameroceras mathieui A.W. Grabau † - (PROTEROCAMEROCERATIDAE) (FOSSIL)
- Mathilda, Genus Mathilda J.O. Semper, 1865 (MATHILDIDAE)
- mathildae, Dilataria succineata mathildae (C.A. Westerlund, 1878) - (CLAUSILIIDAE)
- mathildae, Alopia plumbea mathildae M. von Kimakowicz, 1894 - (CLAUSILIIDAE)
- mathildae, Leptopoma mathildae W.L.H. Dohrn, 1862 - (CYCLOPHORIDAE)
- mathildae, Wilhelminaia mathildae H.B. Preston, 1913 - (HELICARIONIDAE)
- mathildae, Hiltrudia mathildae (C.A. Westerlund, 1881) - (HYGROMIIDAE)
- mathildae, Mutela mathildae H.B. Preston, 1913 - syn of: Aspatharia subreniformis (G.B. Sowerby, 1867) - (IRIDINIDAE)
- mathildaeformis, Cerithiopsis mathildaeformis J.C. Melvill, 1906 - (CERITHIOPSIDAE)
- mathildaeformis, Pyrgula mathildaeformis A. Fuchs, 1870 † - (HYDROBIIDAE) (FOSSIL)
- MATHILDIDAE Dall, 1889 - Family (GASTROPODA-HETEROBRANCHIA [Subclass]-MATHILDOIDEA [Superfamily])
- mathildona, Amaea mathildona (H. Masahito, J.T. Kuroda & T. Habe, 1971) - (EPITONIIDAE)
- Mathildona, syn of: Genus Mathilda J.O. Semper, 1865 (MATHILDIDAE)
- mathildopsis, Amaea mathildopsis (K.H. Barnard, 1963) - (EPITONIIDAE)
- mathildopsis, Epitonium mathildopsis K.H. Barnard, 1963 - syn of: Amaea mathildopsis (K.H. Barnard, 1963) - (EPITONIIDAE)
- mathinnae, Roblinella mathinnae (W.F. Petterd, 1879) - (CHAROPIDAE)
- matho, Mathoceras matho (Pervinquiére, 1907 †) - (DESHAYESITIDAE) (FOSSIL)
- Mathoceras, Genus Mathoceras Casey , 1963 (DESHAYESITIDAE) (FOSSIL)
- Mathoceratites, Genus Mathoceratites (AMMONOIDEA (UNASSIGNED)) (FOSSIL)
- Mathurifusus, Genus Mathurifusus Szabo, 1983 (CAENOGASTROPODA (UNASSIGNED)) (FOSSIL)
- matihetihensis, Haliotis matihetihensis (Eagle, 1999 †) - (HALIOTIDAE) (FOSSIL)
- matildae, Eatonina matildae F. Rubio & C. Rodriguez Babio, 1996 - (CINGULOPSIDAE)
- matildae, Muricopsis matildae E. Rolán & C. Fernández, 1991 - syn of: Muricopsis matildeae E. Rolán & F. Fernandes, 1991 - (MURICIDAE)
- matildeae, Muricopsis matildeae E. Rolán & F. Fernandes, 1991 - (MURICIDAE)
- matima, Carditamera matima A.A. Olsson, 1922 † - (CARDITIDAE) (FOSSIL)
- matima, Strombina matima A.A. Olsson, 1922 † - (COLUMBELLIDAE) (FOSSIL)
- matitukensis, Cardita matitukensis Slodkewitsch, 1938 - syn of: Cyclocardia crassidens (W.J. Broderip & G.B. I Sowerby, 1829) - (CARDITIDAE)
- matiyensis, Cymbiola vespertilio matiyensis H. Douté, 1985 - (VOLUTIDAE)
- matjasici, Vinodolia matjasici (J. Bole, 1961) - (HYDROBIIDAE)
- matoatoa, Kalidos matoatoa K.C. Emberton, 2007 - (ARIOPHANTIDAE)
- matoatoa, Boucardicus matoatoa K.C. Emberton, 2010 - (CYCLOPHORIDAE)
- matocotana, Teredothyra matocotana (P. Bartsch, 1927) - (TEREDINIDAE)
- matocotana, Teredo matocotana P. Bartsch, 1927 - syn of: Teredothyra matocotana (P. Bartsch, 1927) - (TEREDINIDAE)
- matoensis, Cystiscus matoensis A. Wakefield & T. McCleery, 2006 - (CYSTISCIDAE)
- matonabbei, Camptonectes matonabbei McLearn, 1933 † - (PECTINIDAE) (FOSSIL)
- matonabbei, Goniomya matonabbei McLearn, 1933 † - (PHOLADOMYIDAE) (FOSSIL)
- matoni, Azeca matoni W.E. Leach, 1831 - syn of: Azeca goodalli (A.E.J. Férussac, 1821) - (COCHLICOPIDAE)
- matoni, Auricula matoni J.E. Gray, 1825 - syn of: Chilina fluminea (W.G. Maton, 1811) - (ELLOBIIDAE)
- matoni, Neritina matoni O.A.L. Mörch, 1852 - syn of: Neritina virginea (C. Linnaeus, 1758) - (NERITIDAE)
- matoni, Ostrea matoni E. Donovan, 1824 - syn of: Mimachlamys asperrima (J.B.P.A. Lamarck, 1819) - (OSTREIDAE)
- matoni, Jujubinus matoni (B.C.M. Payraudeau, 1827) - (TROCHIDAE)
- matoni, Trochus matoni B.C.M. Payraudeau, 1826 - syn of: Jujubinus exasperatus (T. Pennant, 1777) - (TROCHIDAE)
- matoni, Jujubinus matoni B.C.M. Payraudeau, 1826 - syn of: Jujubinus exasperatus (T. Pennant, 1777) - (TROCHIDAE)
- matoni, Jujubinus exasperatus matoni (B.C.M. Payraudeau, 1826) - (TROCHIDAE)
- matoniana, Rissoa matoniana C.A. Récluz, 1844 - syn of: Rissoa parva (E.M. Da Costa, 1778) - (RISSOIDAE)
- matoniana, Unio matoniana D'Orbigny, 1835 - syn of: Rhipidodonta variabilis (W.G. Maton, 1811) - (UNIONIDAE)
- matorelli, Trichia matorelli (J.R. Bourguignat, 1878) - (HYGROMIIDAE)
- matraensis, Gyraulus matraensis Gál & al., 1999 - (PLANORBIDAE)
- matrella, Helicigona matrella (C.A. Westerlund, 1898) - (HELICIDAE)
- matris, Modiolus matris H.A. Pilsbry, 1921 - (MYTILIDAE)
- matrix, Modiolus matrix H.A. Pilsbry, 1921 - syn of: Modiolus matris H.A. Pilsbry, 1921 - (MYTILIDAE)
- matronalis, Mitra matronalis H.C.F. Schumacher, 1817 - syn of: Scabricola casta (J.F. Gmelin, 1791) - (MITRIDAE)
- matronica, Pyrostoma matronica J.R. Bourguignat, 1877 - syn of: Pareuthria plicatula K.H.J. Thiele, 1912 - (CLAUSILIIDAE)
- matronica, Trochulus matronica J.F. Mabille, 1877 - syn of: Trichia hispida (C. Linnaeus, 1758) - (HYGROMIIDAE)
- matronicus, Unio matronicus J.R. Bourguignat, 1882 - syn of: Unio arcuatus N.R. Bouchard-Chantereaux, 1838 - (UNIONIDAE)
- matruelis, Calocochlia matruelis G.B. I Sowerby, 1841 - (BRADYBAENIDAE)
- matsakisi, Vitrea matsakisi F. Riedel & M. Mylonas, 1980 - (PRISTILOMATIDAE)
- Matschachelia, Subgenus Euxinolauria (Matschachelia) A.A. Schileyko, 1976 (LAURIIDAE)
- matschiense, Keenocardium matschiense A.I. Kafanov, 1984 † - (CARDIIDAE) (FOSSIL)
- matschiense, Mizuhopecten matschiense (Lautenschläger, 1964 †) - (PECTINIDAE) (FOSSIL)
- matschiensis, Corbicula matschiensis Lautenschläger, 1968 † - (CYRENIDAE) (FOSSIL)
- matschigarica, Profulvia matschigarica Khomenko, 1938 † - (CARDIIDA (UNASSIGNED)) (FOSSIL)
- matschigarica, Papyridea matschigarica Khomenko, 1938 † - syn of: Profulvia matschigarica Khomenko, 1938 † - (CARDIIDAE) (FOSSIL)
- matschigarica, Megacardita matschigarica (Khomenko, 1938 †) - (CARDITIDAE) (FOSSIL)
- matschigarica, Sachalinella matschigarica (L. Krishtofovich, 1964 †) - (YOLDIIDAE) (FOSSIL)
- matschigarica uspenica, Papyridea matschigarica uspenica K.B. Barinov, 1987 † - syn of: Profulvia matschigarica Khomenko, 1938 † - (CARDIIDAE) (FOSSIL)
- matskasii, Elma matskasii A. Varga, 2012 - (STREPTAXIDAE)
- matsoko, Cyathopoma matsoko K.C. Emberton, 2010 - (CYCLOPHORIDAE)
- matsoni, Aclis matsoni McNeil, 1984 † - (ACLIDIDAE) (FOSSIL)
- matsoni, Potamides matsoni W.H. Dall, 1913 † - (POTAMIDIDAE) (FOSSIL)
- matsuii, Callomysia matsuii T. Habe, 1951 - (MONTACUTIDAE)
- matsukumai, Leiosyrinx matsukumai P. Bouchet & A.V. Sysoev, 2001 - (RAPHITOMIDAE)
- matsumiyai, Crenavolva matsumiyai M. Azuma, 1974 - (OVULIDAE)
- matsumoriensis, Miyagipecten matsumoriensis O. Masuda, 1952 † - (PECTINIDAE) (FOSSIL)
- Matsumotoa, Genus Matsumotoa Okada, 1958 (NOETIIDAE) (FOSSIL)
- matsumotoae, Panopea matsumotoae Tashiro, 1976 † - (HIATELLIDAE) (FOSSIL)
- matsumotoi, Mimarcaria matsumotoi T. Habe, 1958 - (ARCIDAE)
- matsumotoi, Sorobanobaca matsumotoi Nishida, 1969 † - (BELLEROPHONTIDAE) (FOSSIL)
- matsumotoi, Zuluiceras matsumotoi Klinger & J. Kennedy, 1984 † - (COLLIGNONICERATIDAE) (FOSSIL)
- matsumotoi, Eoursivivas matsumotoi (Hase 1960) † - (CORBULIDAE) (FOSSIL)
- matsumotoi, Crioceratites matsumotoi (Sarkar 1955 †) - (CRIOCERATITIDAE) (FOSSIL)
- matsumotoi, Veloritina matsumotoi Tamura, 1977 † - (CYRENIDAE) (FOSSIL)
- matsumotoi, Onitshoceras matsumotoi Reyment, 1954 † - (DESMOCERATIDAE) (FOSSIL)
- matsumotoi, Niso matsumotoi J.T. Kuroda & T. Habe, 1961 - (EULIMIDAE)
- matsumotoi, Anagaudryceras matsumotoi Morozumi, 1985 † - (GAUDRYCERATIDAE) (FOSSIL)
- matsumotoi, Longibelus matsumotoi (Y.M. Hirano, Obata & Ukishima, 1991 †) - (GROENLANDIBELIDAE) (FOSSIL)
- matsumotoi, Naefia matsumotoi Y.M. Hirano, Obata & Ukishima, 1991 † - syn of: Longibelus matsumotoi (Y.M. Hirano, Obata & Ukishima, 1991 †) - (GROENLANDIBELIDAE) (FOSSIL)
- matsumotoi, Cylichnium matsumotoi T. Habe, 1955 - syn of: Cylichnium ancillarioides (M.M. Schepman, 1913) - (HAMINOEIDAE)
- matsumotoi, Parainoceramya matsumotoi (I. Hayami, 1960 †) - (INOCERAMIDAE) (FOSSIL)
- matsumotoi, Paraborniola matsumotoi T. Habe, 1958 - (LASAEIDAE)
- matsumotoi, Mipus matsumotoi S. Kosuge, 1985 - (MURICIDAE)
- matsumotoi, Isodomella matsumotoi Ohta 1975 † - (NEOMIODONTIDAE) (FOSSIL)
- matsumotoi, Eubostrychoceras matsumotoi Cobban, 1987 † - (NOSTOCERATIDAE) (FOSSIL)
- matsumotoi, Hyposcaphites matsumotoi Tanabe, 1977 † - (SCAPHITIDAE) (FOSSIL)
- matsumotoi, Pitar matsumotoi (T. Nagao, 1928 †) - (VENERIDAE) (FOSSIL)
- matsunamiensis, Pyrgiscus matsunamiensis (Y. Otuka, 1935) - (PYRAMIDELLIDAE)
- matsushimaensis, Flexoptychites matsushimaensis Bando, 1964 † - (PTYCHITIDAE) (FOSSIL)
- matsushimensis, Turbonilla matsushimensis S. Nomura, 1936 - (PYRAMIDELLIDAE)
- matsushitai, Ancilla matsushitai T. Shuto & Y. Ueda, 1967 † - (ANCILLARIIDAE) (FOSSIL)
- matsushitai, Aturia matsushitai Kobayashi, 1956 † - (ATURIIDAE) (FOSSIL)
- matsushitai, Streblochondria matsushitai Nakazawa, 1971 † - (STREBLOCHONDRIIDAE) (FOSSIL)
- matsusimai, Clausilia matsusimai T. Habe, 1940 - (CLAUSILIIDAE)
- matsusimana, Odostomia matsusimana S. Nomura, 1936 - (PYRAMIDELLIDAE)
- matsusimana, Decorifer matsusimana S. Nomura, 1940 - syn of: Decorifer matusimanus (S. Nomura, 1940) - (RETUSIDAE)
- matsusimensis, Margarites matsusimensis S. Nomura, 1940 - (MARGARITIDAE)
- mattarica, Melanopsis letourneuxi mattarica P.M. Pallary, 1911 - (MELANOPSIDAE)
- mattea, Figuladra mattea (T. Iredale, 1933) - (CAMAENIDAE)
- mattei, Chebbites mattei (Feist, 1970 †) - (MIMOSPHINCTIDAE) (FOSSIL)
- Matteiceras, Subgenus Protogrammoceras (Matteiceras) Dommergues & al., 1985 (HILDOCERATIDAE) (FOSSIL)
- matteoi, Menesthella matteoi E. Robba, 2013 † - (PYRAMIDELLIDAE) (FOSSIL)
- matteus, Marmarofusus matteus Snyder & W.G. Lyons, 2014 - (FASCIOLARIIDAE)
- mattewsi, Morum mattewsi W.K. Emerson, 1967 - syn of: Morum matthewsi W.K. Emerson, 1967 - (HARPIDAE)
- mattheeorum, Marginella mattheeorum S.G. Veldsman, S.G. Veldsman & A. Aiken, 2012 - (MARGINELLIDAE)
- Matthevia, Genus Matthevia Walcott , 1885 (MATTHEVIIDAE) (FOSSIL)
- MATTHEVIIDAE Walcott, 1886 - Family (POLYPLACOPHORA-PALEOLORICATA [Subclass]) (FOSSIL)
- matthewi, Aviculomonotis matthewi (A.W. Grabau, 1931 †) - (PSEUDOMONOTIDAE) (FOSSIL)
- matthewsae, Epitonium matthewsae W.J. Clench & H. Turner, 1952 - (EPITONIIDAE)
- matthewsensis, Pterynotus matthewsensis T.H. Aldrich, 1886 † - (MURICIDAE) (FOSSIL)
- matthewsi, Bassethullia matthewsi (W.T. Bednall & H.A. Pilsbry in H.A. Pilsbry, 1894) - (ACANTHOCHITONIDAE)
- matthewsi, Ancilla matthewsi J.Q. Burch & R.L. Burch, 1967 - (ANCILLARIIDAE)
- matthewsi, Siphonalia matthewsi H.F.A. von Ihering, 1914 † - syn of: Sassia armata (L.H. Hupé, 1854 †) - (BUCCINIDAE) (FOSSIL)
- matthewsi, Serpho matthewsi (H.H. Suter, 1909) - (CHAROPIDAE)
- matthewsi, Therasia matthewsi H.H. Suter, 1909 - syn of: Serpho matthewsi (H.H. Suter, 1909) - (CHAROPIDAE)
- matthewsi, Morum matthewsi W.K. Emerson, 1967 - (HARPIDAE)
- matthewsi, Nannomactra matthewsi (R. Tate, 1888) - (MACTRIDAE)
- matthewsi, Bullata matthewsi (J.J. Van Mol & B. Tursch, 1967) - (MARGINELLIDAE)
- matthewsi, Fremblya matthewsi T. Iredale, 1910 - (MOPALIIDAE)
- matthewsi, Tomigerus matthewsi A. Salgado & J.L.M. Leme, 1991 - (ODONTOSTOMIDAE)
- matthewsi tasmanica, Fremblya matthewsi tasmanica (E.A. Ashby, 1920) - (MOPALIIDAE)
- matthewsianus, Leptochiton matthewsianus (W.T. Bednall in W.T. Bednall & E.H. Matthews, 1906) - (LEPTOCHITONIDAE)
- matthewsii, Chiton matthewsii T. Iredale & A.F.B. Hull, 1926 - syn of: Chiton hululensis (E.A. Smith, 1903) - (CHITONIDAE)
- mattheyi, Diarthema mattheyi (De Loriol, 1889 †) - (APORRHAIDAE) (FOSSIL)
- matthiasi, Clavatula matthiasi F. Nolf, 2008 - (CLAVATULIDAE)
- matthieui, Pseudolibera matthieui A.F. Sartori, O. Gargominy & Fontaine, 2014 - (ENDODONTIDAE)
- matthioli, Protorcula matthioli (Stoppani, 1858 †) - (PROTORCULIDAE) (FOSSIL)
- mattiacus, Agalactochilus mattiacus (Steininger, 1835) † - (HELICIDAE) (FOSSIL)
- mattiformis, Lucina mattiformis L.W. Stephenson, 1941 † - (LUCINIDAE) (FOSSIL)
- mattii, Dyris mattii Wesselingh, 2006 † - (COCHLIOPIDAE) (FOSSIL)
- mattirolii, Diplodon mattirolii C.M. Tapparone-Canefri, 1883 - syn of: Virgus beccarianus (C.M. Tapparone-Canefri, 1883) - (HYRIIDAE)
- mattogrossensis, Fossula fossiculifera mattogrossensis (H.F.A. von Ihering, 1919) - (MYCETOPODIDAE)
- mattoonense, Domatoceras mattoonense Tucker, 1976 † - (GRYPOCERATIDAE) (FOSSIL)
- matudai, Clausilia matudai Y. Hirase, 1957 - (CLAUSILIIDAE)
- matudai, Tortaxis matudai Y. Hirase, 1941 - (SUBULINIDAE)
- matukense, Cerithium matukense (R.B. Watson, 1880) - (CERITHIIDAE)
- matukense, Cerithidea matukense R.B. Watson, 1880 - syn of: Cerithium matukense (R.B. Watson, 1880) - (POTAMIDIDAE)
- matukense moellendorffi, Cerithium matukense moellendorffi (W. Kobelt, 1886) - (CERITHIIDAE)
- matukense moellendorffi, Cerithidea matukense moellendorffi W. Kobelt, 1886 - syn of: Cerithium matukense moellendorffi (W. Kobelt, 1886) - (POTAMIDIDAE)
- matulici, Medora dalmatina matulici (R. Sturany, 1901) - (CLAUSILIIDAE)
- matumoriensis, Mizuhopecten matumoriensis (A. Nakamura, 1940 †) - (PECTINIDAE) (FOSSIL)
- matunamiensis, Turbonilla matunamiensis Y. Otuka, 1935 - (PYRAMIDELLIDAE)
- matura, Tornatellaea matura (F. Schröder, 1995 †) - (ACTEONIDAE) (FOSSIL)
- matura, Praeconia matura Hautmann 2001 † - (ASTARTIDAE) (FOSSIL)
- matura, Ringicula matura F. Schröder, 1995 † - syn of: Tornatellaea matura (F. Schröder, 1995 †) - (RINGICULIDAE) (FOSSIL)
- maturata, Erosaria maturata T. Kira, 1959 - syn of: Erosaria cernica (G.B. III Sowerby, 1870) - (CYPRAEIDAE)
- maturensis, Parviturbo maturensis P.O. Jung, 1969 † - (SKENEIDAE) (FOSSIL)
- MATURIFUSIDAE - syn of Family: PSEUDOTRITONIIDAE (FOSSIL)
- Maturifusus, Genus Maturifusus Szabo , 1983 (PSEUDOTRITONIIDAE) (FOSSIL)
- maturoglabra, Diplozone maturoglabra Horný 1994 † - (MURCHISONIIDAE) (FOSSIL)
- matusima, Barbitonia arthritica matusima (S. Nomura & K.M. Hatai, 1937) - (BUCCINIDAE)
- matusimai, Mundiphaedusa kuninoae matusimai (T. Habe, 1940) - (CLAUSILIIDAE)
- matusimana, Acteocina matusimana (S. Nomura, 1939) - (ACTEOCINIDAE)
- matusimana, Odostomia matusimana S. Nomura, 1936 - (PYRAMIDELLIDAE)
- matusimana, Cingula matusimana S. Nomura, 1940 - (RISSOIDAE)
- matusimanus, Decorifer matusimanus (S. Nomura, 1940) - (RETUSIDAE)
- matusimensis, Turbonilla matusimensis S. Nomura, 1936 - (PYRAMIDELLIDAE)
- matusitai, Corbicula matusitai M. Suzuki, 1941 - (CYRENIDAE)
- matuta, Sinuitina matuta Öpik, 1953 † - (TROPIDODISCIDAE) (FOSSIL)
- matutina, Pleuropoma laciniosa matutina M.C. Neal, 1934 - (HELICINIDAE)
- matutina, Maclurites matutina J.W. Hall, 1847 † - (MACLURITIDAE) (FOSSIL)
- matutinum, Eoprotrachyceras matutinum Tozer, 1980 † - (TRACHYCERATIDAE) (FOSSIL)
- maua, Catriona maua Er. Marcus & Ev. Marcus, 1960 - (TRINCHESIIDAE)
- maubertense, Trochotoma maubertense Terquem & L.É.S. Piette, 1865 † - (TROCHOTOMIDAE) (FOSSIL)
- maubeugei, Paroecotraustes maubeugei Stephanov, 1966 † - (OPPELIIDAE) (FOSSIL)
- maudense, Charlotticeras maudense Smith & Tipper, 1996 † - (EODEROCERATIDAE) (FOSSIL)
- maudensis, Venericardia maudensis G.B. Pritchard, 1895 † - (CARDITIDAE) (FOSSIL)
- maudensis, Eucrassatella maudensis (G.B. Pritchard, 1903 †) - (CRASSATELLIDAE) (FOSSIL)
- maudensis, Tucetilla maudensis (A.C. Chapman & F.A. Singleton, 1925) - (GLYCYMERIDIDAE)
- Maudrillia, syn of: Genus Mauidrillia A. Powell, 1942 (HORAICLAVIDAE)
- mauduyti, Potomida mauduyti J. Germain, 1897 - syn of: Potomida littoralis (G.L.C.F.D. Cuvier, 1798) - (UNIONIDAE)
- maugeana, Dendrodoris maugeana R.F. Burn, 1962 - (DENDRODORIDIDAE)
- maugeana, Hemicycla maugeana (R.J. Shuttleworth, 1852) - (HELICIDAE)
- maugeana, Dentimargo maugeana C. Hedley, 1915 - syn of: Dentimargo kemblensis (C. Hedley, 1903) - (MARGINELLIDAE)
- maugeana, Marginella maugeana C. Hedley, 1915 - syn of: Dentimargo kemblensis (C. Hedley, 1903) - (MARGINELLIDAE)
- maugeana, Melibe maugeana R.F. Burn, 1960 - (TETHYDIDAE)
- maugeansis, Haminoea maugeansis R.F. Burn, 1966 - (HAMINOEIDAE)
- maugeansis, Onchidoris maugeansis (R.F. Burn, 1958) - (ONCHIDORIDIDAE)
- maugei, Testacella maugei A.E.J. Férussac, 1819 - (TESTACELLIDAE)
- maugenesti, Acanthopleuroceras maugenesti (A.V.M.D. D'Orbigny, 1844 †) - (POLYMORPHITIDAE) (FOSSIL)
- maugerae, Gonaxis maugerae (J.E. Gray, 1837) - (STREPTAXIDAE)
- Maugerella, syn of: Subgenus Stenoplax (Stenoradsia) P.P. Carpenter in W.H. Dall, 1879 (ISCHNOCHITONIDAE)
- maugeri, Bulimus maugeri W. Wood, 1828 - syn of: Anoma nigrescens (C.B. Adams, 1851) - (BULIMULIDAE)
- maugeri, Clanculus maugeri Wood, 1828 - (TROCHIDAE)
- maugeri albida, Cylindrella maugeri albida C.B. Adams, 1851 - syn of: Anoma splendens (K.T. Menke, 1841) - (UROCOPTIDAE)
- maugeri bicincta, Cylindrella maugeri bicincta C.B. Adams, 1851 - syn of: Anoma levis C.B. Adams, 1851 - (UROCOPTIDAE)
- maugeri bicolor, Cylindrella maugeri bicolor E. Chitty, 1853 - syn of: Anoma alboanfractus (E. Chitty) - (UROCOPTIDAE)
- maugeri cinerea, Cylindrella maugeri cinerea C.B. Adams, 1851 - syn of: Anoma tesselata (C.B. Adams, 1851) - (UROCOPTIDAE)
- maugeri citrina, Cylindrella maugeri citrina C.B. Adams, 1851 - syn of: Anoma splendens (K.T. Menke, 1841) - (UROCOPTIDAE)
- maugeri concinna, Cylindrella maugeri concinna C.B. Adams, 1851 - syn of: Anoma levis C.B. Adams, 1851 - (UROCOPTIDAE)
- maugeri conica, Cylindrella maugeri conica C.B. Adams, 1851 - syn of: Anoma solida (C.B. Adams, 1851) - (UROCOPTIDAE)
- maugeri corpulenta, Cylindrella maugeri corpulenta C.B. Adams, 1851 - syn of: Anoma striata (C.B. Adams, 1851) - (UROCOPTIDAE)
- maugeri crassa, Cylindrella maugeri crassa C.B. Adams, 1851 - syn of: Anoma nigrescens (C.B. Adams, 1851) - (UROCOPTIDAE)
- maugeri fusca, Cylindrella maugeri fusca C.B. Adams, 1851 - syn of: Anoma striata (C.B. Adams, 1851) - (UROCOPTIDAE)
- maugeri quadricolor, Cylindrella maugeri quadricolor E. Chitty, 1853 - syn of: Anoma nigrescens (C.B. Adams, 1851) - (UROCOPTIDAE)
- maugeri raphinina, Cylindrella maugeri raphinina E. Chitty, 1853 - syn of: Anoma tricolor L. Pfeiffer, 1852 - (UROCOPTIDAE)
- maugeri rosealabris, Cylindrella maugeri rosealabris E. Chitty, 1853 - syn of: Anoma splendens (K.T. Menke, 1841) - (UROCOPTIDAE)
- maugeri rufilabris, Cylindrella maugeri rufilabris C.B. Adams, 1851 - syn of: Anoma nigrescens (C.B. Adams, 1851) - (UROCOPTIDAE)
- maugeri striatula, Cylindrella maugeri striatula C.B. Adams, 1851 - syn of: Anoma solida (C.B. Adams, 1851) - (UROCOPTIDAE)
- maugeri tricolor, Cylindrella maugeri tricolor C.B. Adams, 1851 - syn of: Anoma splendens (K.T. Menke, 1841) - (UROCOPTIDAE)
- maugeri unicincta, Cylindrella maugeri unicincta C.B. Adams, 1851 - syn of: Anoma levis C.B. Adams, 1851 - (UROCOPTIDAE)
- maugeri unicolor, Cylindrella maugeri unicolor C.B. Adams, 1851 - syn of: Anoma solida (C.B. Adams, 1851) - (UROCOPTIDAE)
- maugeri valida, Cylindrella maugeri valida C.B. Adams, 1851 - syn of: Anoma solida (C.B. Adams, 1851) - (UROCOPTIDAE)
- Maugeria, syn of: Genus Acanthopleura L. Guilding, 1829 (CHITONIDAE)
- maugeriae, Cypraea maugeriae G.B. II Sowerby, 1832 - syn of: Niveria maugeriae (G.B. II Sowerby, 1832) - (CYPRAEIDAE)
- maugeriae, Orobophana maugeriae (J.E. Gray, 1824) - (HELICINIDAE)
- maugeriae, Stenophysa maugeriae (J.E. Gray, 1837) - (PHYSIDAE)
- maugeriae, Niveria maugeriae (G.B. II Sowerby, 1832) - (TRIVIIDAE)
- maugeriae, Hespererato maugeriae (J.E. Gray, 1832) - (TRIVIIDAE)
- maugeriae domingensis, Hespererato maugeriae domingensis (C.J. Maury, 1917) - (TRIVIIDAE)
- maugeriae martinicensis, Hespererato maugeriae martinicensis F.A. Schilder, 1933 - syn of: Hespererato martinicensis F.A. Schilder, 1933 - (TRIVIIDAE)
- maugieri, Lauria maugieri E. Caziot - syn of: Lauria cylindracea (E.M. Da Costa, 1778) - (LAURIIDAE)
- maui, Calliostoma maui (B.A. Marshall, 1995) - (CALLIOSTOMATIDAE)
- maui, Maurea maui B.A. Marshall, 1995 - syn of: Calliostoma maui (B.A. Marshall, 1995) - (CALLIOSTOMATIDAE)
- maui, Melanella maui (R.K. Dell, 1952) - (EULIMIDAE)
- maui, Cytora maui B.A. Marshall & G.M. Barker, 2007 - (LIAREIDAE)
- maui, Acesta maui Marshall, 2001 - (LIMIDAE)
- maui, Ziba maui (E.A. Kay, 1979) - (MITRIDAE)
- mauia, Navicula mauia W.H. Dall, P. Bartsch & H.A. Rehder, 1938 - syn of: Arca kauaia (W.H. Dall, P. Bartsch & H.A. Rehder, 1938) - (ARCIDAE)
- mauia, Arca mauia W.H. Dall, P. Bartsch & H.A. Rehder, 1938 - syn of: Arca kauaia (W.H. Dall, P. Bartsch & H.A. Rehder, 1938) - (ARCIDAE)
- mauia, Tucetona mauia W.H. Dall, P. Bartsch & H.A. Rehder, 1938 - syn of: Tucetona arcodentiens (W.H. Dall, 1895) - (GLYCYMERIDIDAE)
- mauia, Glycymeris mauia W.H. Dall, P. Bartsch & H.A. Rehder, 1938 - syn of: Tucetona arcodentiens (W.H. Dall, 1895) - (GLYCYMERIDIDAE)
- mauia, Cadella mauia W.H. Dall, P. Bartsch & H.A. Rehder, 1938 - (TELLINIDAE)
- mauia takii, Arca mauia takii K.M. Hatai, H. Niino & T. Kotaka, 1952 - syn of: Arca ventricosa J.B.P.A. Lamarck, 1819 - (ARCIDAE)
- Mauidrillia, Genus Mauidrillia A. Powell, 1942 (HORAICLAVIDAE)
- mauiensis, Perdicella mauiensis L. Pfeiffer - (ACHATINELLIDAE)
- mauiensis, Achatina mauiensis L. Pfeiffer, 1855 - syn of: Leptachatina mauiensis (L. Pfeiffer, 1855) - (ACHATINIDAE)
- mauiensis, Leptachatina mauiensis (L. Pfeiffer, 1855) - (AMASTRIDAE)
- mauiensis, Pustularia mauiensis (C.M. Burgess, 1967) - (CYPRAEIDAE)
- mauiensis, Fusinus mauiensis P. Callomon & M.A. Snyder, 2006 - syn of: Fusinus michaelrogersi D.R. Goodwin, 2001 - (FASCIOLARIIDAE)
- mauiensis, Pleuropoma rotelloidea mauiensis M.C. Neal, 1934 - (HELICINIDAE)
- mauiensis, Succinea mauiensis C.M.F. Ancey, 1889 - (SUCCINEIDAE)
- mauiensis, Melania mauiensis I. Lea, 1856 - (THIARIDAE)
- mauiensis, Tarebia granifera mauiensis A. Brot, 1877 - (THIARIDAE)
- mauiensis wattsi, Pustularia mauiensis wattsi (F.Jr. Lorenz, 2000) - (CYPRAEIDAE)
- Mauira, Genus Mauira Marwick, 1943 (VOLUTIDAE) (FOSSIL)
- Mauithoe, Genus Mauithoe Finlay, 1930 (VOLUTIDAE) (FOSSIL)
- Mauka, Subgenus Philonesia (Mauka) F.C. Baker, 1949 (EUCONULIDAE)
- mauli, Leiostyla vincta mauli H.W. Waldén, 1983 - (LAURIIDAE)
- mauliaensis, Metaconulus mauliaensis Belliard & Gain, 2015 † - (CALLIOSTOMATIDAE) (FOSSIL)
- maullina, Lucapina maullina J. Ramírez-Böhme, 1974 - (FISSURELLIDAE)
- maunahoomae, Hiona perkinsi maunahoomae H.B. Baker, 1940 - (EUCONULIDAE)
- maunalei, Philonesia maunalei H.B. Baker, 1940 - (EUCONULIDAE)
- maunaloae, Lyropupa micra maunaloae H.A. Pilsbry & C.M. Cooke, 1920 - (VERTIGINIDAE)
- maunganuica, Diaphana maunganuica A.W.B. Powell, 1952 - syn of: Diaphana brazieri G.F. Angas, 1877 - (DIAPHANIDAE)
- maungmagana, Meggittia maungmagana H.C. Ray, 1977 - (PSEUDOMELATOMIDAE)
- maunguensis, Duplicaria maunguensis E.W. Vredenburg, 1921 † - (TEREBRIDAE) (FOSSIL)
- maupiensis, Mautodontha maupiensis (A. Garrett, 1872) - (ENDODONTIDAE)
- maura, Engina maura (G.B. I Sowerby, 1832) - (BUCCINIDAE)
- maura, Doris maura E. Forbes, 1840 - syn of: Aegires punctilucens (A.V.M.D. D'Orbigny, 1837) - (DORIDIDAE)
- maura, Otala maura A. Guirao, 1854 - syn of: Otala lactea (O.F. Müller, 1774) - (HELICIDAE)
- maura, Scacchia maura J. van der Linden, 1996 - (LASAEIDAE)
- maura, Strigatella maura W.J. Broderip, 1836 - syn of: Mitra orientalis E. Griffith & E. Pidgeon, 1834 - (MITRIDAE)
- maura, Mammilla maura (J.B.P.A. Lamarck, 1816) - (NATICIDAE)
- maura, Nerita maura C.A. Récluz, 1842 - (NERITIDAE)
- maura, Oliva maura J.B.P.A. Lamarck, 1811 - syn of: Oliva vidua (P.F. Röding, 1798) - (OLIVIDAE)
- maura, Pirena maura L.A. Reeve, 1859 - syn of: Madagasikara spinosa (J.B.P.A. Lamarck, 1819) - (PACHYCHILIDAE)
- maura, Atrina maura (Sowerby, 1833) - (PINNIDAE)
- maura, Pinna maura G.B. I Sowerby, 1835 - syn of: Atrina maura (Sowerby, 1833) - (PINNIDAE)
- maura, Crassispira maura (G.B. I Sowerby, 1834) - (PSEUDOMELATOMIDAE)
- maura, Pilsbryspira maura L.C. Kiener, 1840 - syn of: Pilsbryspira aterrima (G.B. I Sowerby, 1834) - (PSEUDOMELATOMIDAE)
- maura, Pteria maura (L.A. Reeve, 1857) - (PTERIIDAE)
- maura, Siphonaria maura G.B. I Sowerby, 1835 - (SIPHONARIIDAE)
- maura, Rumina maura (J.C.H. Crosse, 1873) - (SUBULINIDAE)
- maura costata, Siphonaria maura costata G.B. I Sowerby, 1835 - (SIPHONARIIDAE)
- maura palmata, Siphonaria maura palmata P.P. Carpenter, 1857 - syn of: Siphonaria palmata P.P. Carpenter, 1857 - (SIPHONARIIDAE)
- maura panamensis, Engina maura panamensis P. Bartsch, 1931 - (BUCCINIDAE)
- maura pica, Siphonaria maura pica G.B. I Sowerby, 1835 - (SIPHONARIIDAE)
- maurae, Calliostoma maurae G.S. Coen, 1937 - syn of: Calliostoma virescens G.S. Coen, 1933 - (CALLIOSTOMATIDAE)
- Maurea, Genus Maurea W.R.B. Oliver, 1926 (CALLIOSTOMATIDAE)
- maureenae, Conus maureenae E.J. Petuch, 1994 † - (CONIDAE) (FOSSIL)
- maureenae, Scaphella maureenae E.J. Petuch, 1994 † - (VOLUTIDAE) (FOSSIL)
- maurei, Cecilioides maurei E. Caziot, 1910 - syn of: Cecilioides acicula (O.F. Müller, 1774) - (FERUSSACIIDAE)
- maureli, Acrioceras ramkrishnai maureli Thomel, 1965 † - (ANCYLOCERATIDAE) (FOSSIL)
- Maurelidiscus, Genus Maurelidiscus Vermeulen, 2007 (HOLCODISCIDAE) (FOSSIL)
- maurellei, Oenopota maurellei W.H. Dall & P. Bartsch, 1910 - (MANGELIIDAE)
- maurelli, Lioceratoides maurelli McLearn, 1930 † - (HILDOCERATIDAE) (FOSSIL)
- Maurennea, syn of: Genus Gulella L. Pfeiffer, 1856 (STREPTAXIDAE)
- maureri, Perotrochus maureri M.G. Harasewych & T.M. Askew, 1993 - (PLEUROTOMARIIDAE)
- maureri, Hyalinia maureri O.W. Von Rosen, 1901 - syn of: Macrochlamys kasnakowi (C.A. Westerlund, 1898) - (ZONITIDAE)
- Maurerina, Genus Maurerina Alberti, 1980 (TENTACULITA (UNASSIGNED)) (FOSSIL)
- Mauretaniaceras, Genus Mauretaniaceras Meister & al., 2011 (HILDOCERATIDAE) (FOSSIL)
- mauretanica, Xerosecta mauretanica (J.R. Bourguignat, 1880) - (HYGROMIIDAE)
- mauretanica, Granulina mauretanica S. Gofas, 1992 - (MARGINELLIDAE)
- mauretanica, Marginella mauretanica F. Boyer & J. Neefs, 1999 - (MARGINELLIDAE)
- mauretanica, Tudorella mauretanica (P.M. Pallary, 1899) - (POMATIIDAE)
- mauretanica, Tudorella sulcata mauretanica (J.B.P.A. Lamarck, 1811) - (POMATIIDAE)
- mauretanicus, Unio mauretanicus D. Van Damme, 1984 - syn of: Potomida littoralis (G.L.C.F.D. Cuvier, 1798) - (UNIONIDAE)
- mauretaniensis, Diaphana mauretaniensis T. Schiøtte, 1998 - (DIAPHANIDAE)
- Mauria, syn of: Genus Mauira Marwick, 1943 (VOLUTIDAE) (FOSSIL)
- mauriana, Cecilioides mauriana J.R. Bourguignat, 1869 - syn of: Cecilioides acicula (O.F. Müller, 1774) - (FERUSSACIIDAE)
- mauriana, Candidula mauriana J.R. Bourguignat in É.A.A. Locard, 1882 - syn of: Candidula gigaxii (L. Pfeiffer, 1850) - (HYGROMIIDAE)
- mauricejayi, Parachiton hylkiae mauricejayi E. Schwabe, 2002 - (LEPTOCHITONIDAE)
- mauricensis, Nucula mauricensis G.F. Harris, 1919 † - (NUCULIDAE) (FOSSIL)
- mauricensis, Ostrea mauricensis W.M. Gabb, 1860 † - (OSTREIDAE) (FOSSIL)
- mauricetteae, Volvarina mauricetteae J. Espinosa & J.A. Ortea, 2012 - (MARGINELLIDAE)
- mauricetteae, Gregoia mauricetteae D. Fehse, 2015 - (TRIVIIDAE)
- Mauricia, Genus Mauricia Harris, 1919 (MYTILIDAE) (FOSSIL)
- mauriciae, Neritina mauriciae R.P. Lesson, 1831 - (NERITIDAE)
- mauricioi, Conus mauricioi J. Coltro, 2004 - syn of: Poremskiconus ziczac archetypus (J.C.H. Crosse, 1865) - (CONIDAE)
- mauricius, Megalobulimus mauricius A. Falconieri, 1996 - (MEGALOBULIMIDAE)
- Mauriella, syn of: Genus Maurea W.R.B. Oliver, 1926 (CALLIOSTOMATIDAE)
- Maurina, syn of: Genus Mauritia F.H. Troschel, 1863 (CYPRAEIDAE)
- mauritanica, Bythinella mauritanica A. Letourneux & J.R. Bourguignat, 1887 - (BYTHINELLIDAE)
- Mauritanica, Subgenus Siciliaria (Mauritanica) O. Bφttger, 1879 (CLAUSILIIDAE)
- mauritanica, Opalia mauritanica F.F. Talavera, 1975 - (EPITONIIDAE)
- mauritanica, Cernuella mauritanica G. Servain, 1880 - syn of: Cernuella virgata (E.M. Da Costa, 1778) - (HYGROMIIDAE)
- mauritanica, Melanopsis mauritanica J.R. Bourguignat, 1884 - (MELANOPSIDAE)
- mauritanica, Parthenina mauritanica (A. Peñas & E. Rolán, 1998) - (PYRAMIDELLIDAE)
- mauritanica, Callogonia mauritanica R. von Cosel & C. Salas, 2001 - (VESICOMYIDAE)
- mauritanicus, Homo erectus mauritanicus (Arambourg, 1954 †) - (Hominidae) (FOSSIL)
- mauritanicus, Bathymodiolus mauritanicus R. von Cosel, 2002 - (MYTILIDAE)
- mauritanicus, Unio mauritanicus J.R. Bourguignat, 1868 - syn of: Potomida littoralis (G.L.C.F.D. Cuvier, 1798) - (UNIONIDAE)
- Mauritia, Genus Mauritia F.H. Troschel, 1863 (CYPRAEIDAE)
- mauritiae, Argonerita mauritiae C.A. Récluz, 1841 - syn of: Nerita aterrima J.F. Gmelin, 1791 - (NERITIDAE)
- mauritiae, Vanikoro mauritiae C.A. Récluz, 1845 - syn of: Vanikoro mauritii (C.A. Récluz, 1845) - (VANIKORIDAE)
- mauritiana, Anolacia mauritiana (G.B. I Sowerby, 1830) - (ANCILLARIIDAE)
- mauritiana, Ancilla mauritiana G.B. I Sowerby, 1830 - syn of: Anolacia mauritiana (G.B. I Sowerby, 1830) - (ANCILLARIIDAE)
- mauritiana, Arca mauritiana K.H.J. Thiele & S.G.A. Jaeckel, 1931 - syn of: Vitracar sulcata (J.B.P.A. Lamarck, 1819) - (ARCIDAE)
- mauritiana, Barbatia mauritiana K.H.J. Thiele & S.G.A. Jaeckel, 1931 - syn of: Vitracar sulcata (J.B.P.A. Lamarck, 1819) - (ARCIDAE)
- mauritiana, Acrosterigma mauritiana (G.P. Deshayes, 1855) - (CARDIIDAE)
- mauritiana, Defrancia mauritiana G.B. III Sowerby, 1893 - syn of: Kermia tessellata (R.B. Hinds, 1843) - (CLATHURELLIDAE)
- mauritiana, Mauritia mauritiana (C. Linnaeus, 1758) - (CYPRAEIDAE)
- mauritiana, Gibberula mauritiana T. Cossignani, 2011 - (CYSTISCIDAE)
- mauritiana, Peltodoris mauritiana L.S.R. Bergh, 1889 - syn of: Peltodoris murrea (F.D. Abraham, 1877) - (DISCODORIDIDAE)
- mauritiana, Paradoris mauritiana L.S.R. Bergh, 1889 - syn of: Peltodoris murrea (F.D. Abraham, 1877) - (DISCODORIDIDAE)
- mauritiana, Asteronotus mauritiana J.R.C. Quoy & J.P. Gaimard, 1832 - syn of: Asteronotus cespitosus (J.C. van Hasselt, 1824) - (DISCODORIDIDAE)
- mauritiana, Eoacmaea mauritiana (H.A. Pilsbry, 1892) - (EOACMAEIDAE)
- mauritiana, Galeomma mauritiana G.B. I Sowerby, 1832 - (GALEOMMATIDAE)
- mauritiana, Gastrochaena mauritiana D'Orbigny in R. de la Sagra, 1853 - syn of: Gastrochaena cuneiformis L. Spengler, 1783 - (GASTROCHAENIDAE)
- mauritiana, Peasiella mauritiana (J.M.R.M. Viader, 1951) - (LITTORINIDAE)
- mauritiana, Littoraria mauritiana (J.B.P.A. Lamarck, 1822) - (LITTORINIDAE)
- mauritiana, Sepioteuthis mauritiana J.R.C. Quoy & J.P. Gaimard, 1832 - syn of: Sepioteuthis lessoniana R.P. Lesson, 1830 - (LOLIGINIDAE)
- mauritiana, Patelloida profunda mauritiana (H.A. Pilsbry, 1891) - (LOTTIIDAE)
- mauritiana, Pillucina mauritiana E.A. Glover & D.W. Taylor, 2001 - (LUCINIDAE)
- mauritiana, Scabricola mauritiana G.B. Sowerby, 1874 - syn of: Mitra lacunosa L.A. Reeve, 1844 - (MITRIDAE)
- mauritiana, Aspella mauritiana G.E. Radwin & D'Attilio, 1976 - (MURICIDAE)
- mauritiana, Bullia mauritiana J.E. Gray, 1839 - (NASSARIIDAE)
- mauritiana, Nuculana mauritiana (G.B. I Sowerby, 1833) - (NUCULANIDAE)
- mauritiana, Nucula mauritiana G.B. I Sowerby, 1833 - syn of: Nuculana mauritiana (G.B. I Sowerby, 1833) - (NUCULIDAE)
- mauritiana, Oliva mauritiana F.P. Marrat, 1871 - syn of: Oliva vidua (P.F. Röding, 1798) - (OLIVIDAE)
- mauritiana, Peronia mauritiana H.M.D. de Blainville, 1824 - syn of: Peronia peronii (G.L.C.F.D. Cuvier, 1804) - (ONCHIDIIDAE)
- mauritiana, Aequipecten opercularis mauritiana (C. Linnaeus, 1758) - (PECTINIDAE)
- mauritiana, Odostomia mauritiana W.H. Dall & P. Bartsch, 1906 - (PYRAMIDELLIDAE)
- mauritiana, Kermia mauritiana G.B. Sowerby, 1893 - syn of: Kermia producta (W.H. Pease, 1860) - (RAPHITOMIDAE)
- mauritiana, Simulamerelina mauritiana (E.C. Von Martens, 1880) - (RISSOIDAE)
- mauritiana, Lamellaria mauritiana L.S.R. Bergh, 1853 - syn of: Coriocella nigra (H.M.D. de Blainville, 1824) - (VELUTINIDAE)
- mauritiana albiflora, Mauritia mauritiana albiflora J. Petrbok, 1932 - (CYPRAEIDAE)
- mauritiana calxequina, Mauritia mauritiana calxequina (J.C. Melvill & R. Standen, 1899) - (CYPRAEIDAE)
- mauritiana crassior, Austrolittorina mauritiana crassior R.A. Philippi, 1847 - syn of: Austrolittorina unifasciata (J.E. Gray, 1826) - (LITTORINIDAE)
- mauritiana crassior, Littorina mauritiana crassior R.A. Philippi, 1847 - syn of: Austrolittorina unifasciata (J.E. Gray, 1826) - (LITTORINIDAE)
- mauritiana gracilior, Echinolittorina mauritiana gracilior R.A. Philippi, 1847 - syn of: Echinolittorina ziczac (J.F. Gmelin, 1791) - (LITTORINIDAE)
- mauritianella, Pachystyla inversicolor mauritianella (P.M.A. Morelet) - (HELICARIONIDAE)
- mauritianum, Tritonium mauritianum C.M. Tapparone-Canefri, 1876 - syn of: Monoplex mundus Gould, 1849 - (BUCCINIDAE)
- mauritianum, Caecum mauritianum L. de Folin, 1867 - (CAECIDAE)
- mauritianum, Triton mauritianum C.M. Tapparone-Canefri, 1876 - syn of: Monoplex mundus Gould, 1849 - (RANELLIDAE)
- mauritianum, Allopeas mauritianum (L. Pfeiffer, 1852) - (SUBULINIDAE)
- mauritianum obesispira, Allopeas mauritianum obesispira (H.A. Pilsbry & Y. Hirase, 1904) - (SUBULINIDAE)
- mauritianum prestoni, Allopeas mauritianum prestoni (E.R. Sykes, 1898) - (SUBULINIDAE)
- mauritianus, Bulimus mauritianus L. Pfeiffer - syn of: Allopeas mauritianum (L. Pfeiffer, 1852) - (BULIMULIDAE)
- mauritianus, Chiton mauritianus (J.R.C. Quoy & J.P. Gaimard, 1835) - (CHITONIDAE)
- mauritianus, Rhyssoplax mauritianus J.R.C. Quoy & J.P. Gaimard, 1835 - syn of: Chiton mauritianus (J.R.C. Quoy & J.P. Gaimard, 1835) - (CHITONIDAE)
- mauritianus, Conus mauritianus C.H. Hwass in J.G. Bruguière, 1792 - syn of: Conasprella puncticulata (C.H. Hwass in J.G. Bruguière, 1792) - (CONIDAE)
- mauritianus, Hexabranchus mauritianus F.D. Abraham, 1877 - syn of: Hexabranchus sanguineus (W.P.E.S. Rüppell & F.S. Leuckart, 1830) - (HEXABRANCHIDAE)
- mauritianus, Gyraulus mauritianus P.M.A. Morelet, 1876 - (PLANORBIDAE)
- mauritianus, Strombus mauritianus J.B.P.A. Lamarck, 1822 - syn of: Conomurex decorus (P.F. Röding, 1798) - (STROMBIDAE)
- mauritianus, Conomurex mauritianus J.B.P.A. Lamarck, 1822 - syn of: Conomurex decorus (P.F. Röding, 1798) - (STROMBIDAE)
- mauritianus, Lamellaxis mauritianus L. Pfeiffer, 1852 - syn of: Allopeas mauritianum (L. Pfeiffer, 1852) - (SUBULINIDAE)
- mauritianus, Hyalimax mauritianus (P.C.A.S.L. Rang, 1827) - (SUCCINEIDAE)
- mauritianus, Tectus mauritianus (J.F. Gmelin, 1791) - (TEGULIDAE)
- mauritianus, Afsharius mauritianus (J.M.R.M. Viader, 1951) - (TELLINIDAE)
- mauritianus, Trimusculus mauritianus (E.C. Von Martens, 1880) - (TRIMUSCULIDAE)
- mauritianus, Clanculus mauritianus J.C. Melvill, 1909 - (TROCHIDAE)
- mauritianus, Trochus mauritianus J.F. Gmelin, 1791 - syn of: Tectus mauritianus (J.F. Gmelin, 1791) - (TROCHIDAE)
- mauritiensis, Hexabranchus mauritiensis F.D. Abraham, 1877 - syn of: Hexabranchus sanguineus (W.P.E.S. Rüppell & F.S. Leuckart, 1830) - (HEXABRANCHIDAE)
- mauritii, Valvatorbis mauritii J.C. Bequaert & W.J. Clench, 1936 † - (ASSIMINEIDAE) (FOSSIL)
- mauritii, Alopia nefasta mauritii R. Kimakowicz, 1928 - (CLAUSILIIDAE)
- mauritii, Alopia canescens mauritii R. von Kimakowicz, 1928 - (CLAUSILIIDAE)
- mauritii, Turricula mauritii M.E.A. de Boury, 1899 † - (CLAVATULIDAE) (FOSSIL)
- mauritii, Margaritifera mauritii H.L. Jameson, 1901 - syn of: Pinctada maculata (A.A. Gould, 1850) - (MARGARITIFERIDAE)
- mauritii, Clypeolum mauritii (R.P. Lesson, 1831) - (NERITIDAE)
- mauritii, Pinctada mauritii H.L. Jameson, 1901 - syn of: Pinctada maculata (A.A. Gould, 1850) - (PTERIIDAE)
- mauritii, Vanikoro mauritii (C.A. Récluz, 1845) - (VANIKORIDAE)
- mauritii, Paraegopis mauritii (C.A. Westerlund, 1886) - (ZONITIDAE)
- mauritii montenegrinus, Paraegopis mauritii montenegrinus (O. Böttger, 1909) - (ZONITIDAE)
- mauritsi, Telescopium mauritsi L.J.M. Butot, 1954 - syn of: Telescopium telescopium (C. Linnaeus, 1758) - (POTAMIDIDAE)
- Maurohelix, Genus Maurohelix P. Hesse, 1917 (HELICIDAE)
- Mauronapaeus, Subgenus Omphaloconus (Mauronapaeus) W. Kobelt, 1899 (ENIDAE)
- Mauroteuthopsis, syn of: Genus Onykia C.A. Lesueur, 1821 (ONYCHOTEUTHIDAE)
- maurula, Otala maurula W. Kobelt, 1903 - syn of: Otala punctata (O.F. Müller, 1774) - (HELICIDAE)
- maurus, Polydontes natensoni maurus C. de la Torre, 1938 - (CAMAENIDAE)
- maurus, Chicoreus maurus (W.J. Broderip, 1833) - (MURICIDAE)
- maurus, Murex maurus W.J. Broderip, 1833 - syn of: Chicoreus maurus (W.J. Broderip, 1833) - (MURICIDAE)
- maurus, Polinices maurus J.B.P.A. Lamarck, 1816 - syn of: Mammilla maura (J.B.P.A. Lamarck, 1816) - (NATICIDAE)
- maurus sauliae, Chicoreus maurus sauliae G.B. Sowerby, 1841 - syn of: Chicoreus palmarosae (J.B.P.A. Lamarck, 1822) - (MURICIDAE)
- maurus steeriae, Chicoreus maurus steeriae (L.A. Reeve, 1845) - (MURICIDAE)
- mauryae, Barbatia mauryae A.A. Olsson, 1922 † - (ARCIDAE) (FOSSIL)
- mauryae, Cancellaria mauryae A.A. Olsson, 1922 † - (CANCELLARIIDAE) (FOSSIL)
- mauryae, Pegophysema mauryae (H.A. Pilsbry & Johnson, 1917 †) - (LUCINIDAE) (FOSSIL)
- mauryae, Serrata mauryae W.P. Woodring, 1928 † - (MARGINELLIDAE) (FOSSIL)
- mauryae, Subcancilla mauryae (Anderson, 1929 †) - (MITRIDAE) (FOSSIL)
- mauryae, Panamurex mauryae E.H. Vokes, 1970 † - (MURICIDAE) (FOSSIL)
- mauryae, Oreoterebra mauryae A.A. Olsson, 1967 † - syn of: Oreoterebra haitensis (W.H. Dall, 1895 †) - (TEREBRIDAE) (FOSSIL)
- mauryae, Dosina mauryae E.H. Vokes, 1938 † - (VENERIDAE) (FOSSIL)
- mauryana, Turritella mauryana R.B. Newton, 1922 † - (TURRITELLIDAE) (FOSSIL)
- mauryense, Prunum mauryense Nehm, 2001 † - (MARGINELLIDAE) (FOSSIL)
- mauryi, Epitonium mauryi B. Tursch & J. Pierret, 1964 - syn of: Epitonium fractum W.H. Dall, 1927 - (EPITONIIDAE)
- Mauryna, Genus Mauryna de Gregorio, 1880 (SERAPHSIDAE) (FOSSIL)
- mausieri, Cassis mausieri (A.E.M. Cossmann, 1923 †) - (CASSIDAE) (FOSSIL)
- mausonensis, Microcystina mausonensis O.F. von Möllendorff, 1901 - syn of: Microcystina mansonensis O.F. von Möllendorff, 1901 - (ARIOPHANTIDAE)
- mausseneti, Melanopsis mausseneti A.E.M. Cossmann, 1888 † - (MELANOPSIDAE) (FOSSIL)
- mausseneti, Pisidium mausseneti Laubriere, 1886 † - (SPHAERIIDAE) (FOSSIL)
- Maussenetia, Genus Maussenetia A.E.M. Cossmann, 1904 (APORRHAIDAE) (FOSSIL)
- maussieri, Conus maussieri A.E.M. Cossmann, 1923 † - (CONIDAE) (FOSSIL)
- Mautodontha, Genus Mautodontha G.A. Solem, 1976 (ENDODONTIDAE)
- mauvei, Cypraeovula mauvei Aiken, 2016 † - (CYPRAEIDAE) (FOSSIL)
- Mauxenia, syn of: Genus Mauritia F.H. Troschel, 1863 (CYPRAEIDAE)
aaa
abx
ack
acy
adn
aer
afs
ajd
alc
alj
alu
amc
ams
and
anh
anp
anu
apl
arb
ard
arh
ars
asr
atl
atu
aus
aut
bab
baj
bao
bas
baw
bem
bes
bid
bim
bit
bli
bom
bos
bov
bre
bri
bry
bum
bys
caa
cak
cam
cao
cas
cau
cem
ces
che
chk
chy
cio
cle
cob
coh
com
con
coo
cos
cot
cre
cri
cru
cud
cuo
cuy
cym
daa
dam
dav
ded
dem
deo
det
dib
dih
dir
dit
dom
dos
duc
duq
eag
ecr
egg
elf
elp
enh
eov
erf
erz
eud
eus
exb
exl
exy
faa
fan
fat
fes
fim
fle
flu
fos
fre
fuf
fur
fut
gaa
gam
gav
geo
gie
gis
gle
glu
goo
gre
gru
gug
guz
haa
ham
has
heb
hem
hes
hif
his
hom
hou
hun
hye
iac
ilm
imt
ind
inf
ing
int
inu
irm
isp
jaa
jao
jaw
joi
juk
kaa
kao
kaz
kes
kio
koc
kot
kuk
laa
lad
laf
lan
las
lau
lec
leo
leq
lew
lim
lio
liu
loo
lub
lun
luv
maa
mad
mah
mam
mao
mas
mav
mee
mem
mes
mey
mid
min
mio
mit
moe
moo
mos
mum
mut
nab
nao
nav
nel
neq
nex
nih
niu
noe
nou
nue
oaf
obn
obu
oci
oke
olk
oos
orc
oro
osu
ove
paa
paf
pam
paq
pas
pau
pay
pem
pes
pfi
phl
pid
pio
ple
plo
pom
pos
pre
pro
pru
psi
pul
pum
pup
put
pys
qag
qub
rab
rah
ras
red
reh
reu
rhu
rin
roc
rot
rox
rue
ruh
ryd
saa
sai
san
sao
sav
sce
sci
scy
sem
sen
ses
shl
sih
sin
sio
smo
som
soy
sph
spj
sra
stg
sts
suc
sum
suv
szo
tab
tal
taq
tay
ten
teo
tes
tha
thl
tif
toc
tos
tre
trl
try
tuc
tus
uac
ume
uni
urd
vaa
vap
vas
vep
ves
vid
vip
vis
vob
vup
waa
wam
weg
who
wom
xac
yaa
yot
zaa
zem
zoo
|