- mavis, Geitodoris mavis (Er. Marcus & Ev. Marcus, 1967) - (DISCODORIDIDAE)
- mavo, Sitala mavo K.C. Emberton, 2010 - (ARIOPHANTIDAE)
- mavromoustakisi, Albinaria mavromoustakisi R.A.M. Brandt, 1961 - (CLAUSILIIDAE)
- mavromoustakisi, Xeropicta ledereri mavromoustakisi (F. Haas, 1933) - (HYGROMIIDAE)
- mavromoustakisi, Oxychilus mavromoustakisi (F. Haas, 1934) - (OXYCHILIDAE)
- mavrovoensis, Montenegrina perstriata mavrovoensis H. Nordsieck, 2009 - (CLAUSILIIDAE)
- mawae, Ficus mawae J.E. Gray in E. Griffith & E. Pidgeon, 1834 - syn of: Latiaxis mawae (J.E. Gray in E. Griffith & E. Pidgeon, 1834) - (FICIDAE)
- mawae, Latiaxis mawae (J.E. Gray in E. Griffith & E. Pidgeon, 1834) - (MURICIDAE)
- mawae kylix, Latiaxis mawae kylix K.H. Barnard, 1959 - (MURICIDAE)
- mawheraensis, Austrotindaria mawheraensis P.A. Maxwell, 1988 † - (NEILONELLIDAE) (FOSSIL)
- Mawhero, syn of: Genus Cantharidus P.D. Montfort, 1810 (TROCHIDAE)
- mawlei, Callistochiton mawlei T. Iredale & W.L. May, 1916 - (CALLISTOPLACIDAE)
- mawlei, Ischnochiton mawlei T. Iredale & W.L. May, 1916 - (ISCHNOCHITONIDAE)
- mawsoni, Cooperconcha mawsoni (T. Iredale, 1937) - (CAMAENIDAE)
- mawsoni, Semicassis mawsoni B.C. Cotton, 1945 - syn of: Semicassis pyrum (J.B.P.A. Lamarck, 1822) - (CASSIDAE)
- mawsoni, Cirroctopus mawsoni (S.S. Berry, 1917) - (CIRROCTOPODIDAE)
- mawsoni, Carditella mawsoni R.K. Dell, 1972 - (CONDYLOCARDIIDAE)
- mawsoni, Fissidentalium mawsoni N.H. Ludbrook, 1956 † - (DENTALIIDAE) (FOSSIL)
- mawsoni, Parmaphorella mawsoni A.W.B. Powell, 1958 - (FISSURELLIDAE)
- mawsoni, Ischnochiton mawsoni B.C. Cotton, 1937 - syn of: Ischnochiton luteoroseus H.H. Suter, 1907 - (ISCHNOCHITONIDAE)
- mawsoni, Trophon mawsoni A.W.B. Powell, 1957 - (MURICIDAE)
- mawsoni, Leoclunipecten mawsoni (E.M. Fletcher, 1938 †) - (PECTINIDAE) (FOSSIL)
- mawsoni, Pholadomya mawsoni C. Hedley, 1916 - syn of: Lyonsia arcaeformis E.C. Von Martens, 1885 - (PHOLADOMYIDAE)
- mawsoni, Leucosyrinx mawsoni A.W.B. Powell, 1958 - (PSEUDOMELATOMIDAE)
- mawsoni, Tawera mawsoni (C. Hedley, 1916) - (VENERIDAE)
- Maxacteon, Genus Maxacteon W.B. Rudman, 1971 (ACTEONIDAE)
- maxema, Dentisphaera maxema Páll-Gergely & Jochum, 2017 - (GASTROCOPTIDAE)
- maxi, Tubercliopsis maxi A. Cecalupo & I. Perugia, 2012 - (CERITHIOPSIDAE)
- maxicostatum, Cardium maxicostatum J.J. Ter Poorten, 2007 - (CARDIIDAE)
- Maxigoniatites, Genus Maxigoniatites Korn & al., 1999 (MAXIGONIATITIDAE) (FOSSIL)
- MAXIGONIATITIDAE Korn & al., 1999 - Family (CEPHALOPODA-AMMONOIDEA [Subclass]-GONIATITIDA [Order]-PERICYCLOIDEA [Superfamily]) (FOSSIL)
- Maxilites, Genus Maxilites Marek , 1972 (HYOLITHIDA (UNASSIGNED)) (FOSSIL)
- maxilla, Mesoginella maxilla C.F. Laseron, 1957 - syn of: Mesoginella brachia (R.B. Watson, 1886) - (MARGINELLIDAE)
- maxillaris, Latitriphora maxillaris (R.B. Hinds, 1843) - (TRIPHORIDAE)
- maxillaris, Triphora maxillaris R.B. Hinds, 1843 - syn of: Latitriphora maxillaris (R.B. Hinds, 1843) - (TRIPHORIDAE)
- maxillata, Melina maxillata J.B.P.A. Lamarck, 1819 - syn of: Isognomon alatus J.F. Gmelin, 1791 - (MALLEIDAE)
- maxillata, Perna maxillata J.B.P.A. Lamarck, 1819 † - syn of: Isognomon maxillata (J.B.P.A. Lamarck, 1819 †) - (MYTILIDAE) (FOSSIL)
- maxillata, Isognomon maxillata (J.B.P.A. Lamarck, 1819 †) - (PTERIIDAE) (FOSSIL)
- maxillatum, Stenotrema maxillatum A.A. Gould, 1848 - (POLYGYRIDAE)
- maxillatus, Clanculus maxillatus K.T. Menke, 1843 - (TROCHIDAE)
- Maxillifer, syn of: Genus Stenotrema C.S. Rafinesque, 1819 (POLYGYRIDAE)
- maxima, Achatinella mustelina maxima D.A. Welch, 1938 - (ACHATINELLIDAE)
- maxima, Pupa maxima A.V.M.D. D'Orbigny, 1852 † - syn of: Triptychia maxima (J.P.S. Grateloup, 1828 †) - (ACTEONIDAE) (FOSSIL)
- maxima, Anatoma maxima (M.M. Schepman, 1908) - (ANATOMIDAE)
- maxima, Anatoma maxima M.M. Schepman, 1908 - syn of: Anatoma maxima (M.M. Schepman, 1908) - (ANATOMIDAE)
- maxima, Omphalosagda maxima W.A. Wenz, 1919 † - syn of: Archaeoplecta lapidaria (Thomä, 1845 †) - (ARCHAEOZONITIDAE) (FOSSIL)
- maxima, Architectonica maxima R.A. Philippi, 1849 - (ARCHITECTONICIDAE)
- maxima, Seila maxima A. Cecalupo & I. Perugia, 2014 - (CERITHIOPSIDAE)
- maxima, Ryssota maxima L. Pfeiffer, 1853 - (CHRONIDAE)
- maxima, Turcutheca maxima C. Chen & al., 1981 † - (CIRCOTHECIDAE) (FOSSIL)
- maxima, Clausilia maxima A.V.M.D. D'Orbigny, 1852 † - syn of: Triptychia maxima (J.P.S. Grateloup, 1828 †) - (CLAUSILIIDAE) (FOSSIL)
- maxima, Cocculina maxima P. Dautzenberg, 1925 - syn of: Pectinodonta maxima (P. Dautzenberg, 1925) - (COCCULINIDAE)
- maxima, Nihonia maxima A.V. Sysoev, 1997 - (COCHLESPIRIDAE)
- maxima, Colombellina maxima de Loriol, 1861 † - (COLOMBELLINIDAE) (FOSSIL)
- maxima, Megalocranchia maxima G.J. Pfeffer, 1884 - (CRANCHIIDAE)
- maxima, Cuspidaria maxima P. Dautzenberg & H. Fischer, 1897 - (CUSPIDARIIDAE)
- maxima, Prozonaria maxima (J.P.S. Grateloup, 1847 †) - (CYPRAEIDAE) (FOSSIL)
- maxima, Corbicula maxima T. Prime, 1860 - syn of: Cyrenobatissa subsulcata (S. Clessin, 1878) - (CYRENIDAE)
- maxima, Allorisma maxima (Portlock †) - (EDMONDIIDAE) (FOSSIL)
- maxima, Fusinus maxima P.F. Röding, 1798 - syn of: Fusinus longissimus (J.F. Gmelin, 1791) - (FASCIOLARIIDAE)
- maxima, Triptychia maxima (J.P.S. Grateloup, 1828 †) - (FILHOLIIDAE) (FOSSIL)
- maxima, Fissurella maxima Sowerby, 1835 - (FISSURELLIDAE)
- maxima, Theba maxima A.A. Schileyko, 1968 - syn of: Monacha talischana (E.C. Von Martens, 1880) - (HELICIDAE)
- maxima, Cornu aspersum maxima (O.F. Müller, 1774) - (HELICIDAE)
- maxima, Pseudotachea coquandi maxima (P.M.A. Morelet, 1880) - (HELICIDAE)
- maxima, Alcadia maxima (G.B. Sowerby, 1842) - (HELICINIDAE)
- maxima, Sabia maxima H.C.F. Schumacher, 1817 - syn of: Capulus ungaricus (C. Linnaeus, 1758) - (HIPPONICIDAE)
- maxima, Cernuella maxima C. Pollonera, 1892 - syn of: Cernuella virgata (E.M. Da Costa, 1778) - (HYGROMIIDAE)
- maxima, Discula calcigena maxima G. Mandahl-Barth, 1950 - (HYGROMIIDAE)
- maxima, Lima maxima Archiac, 1847 † - (LIMIDAE) (FOSSIL)
- maxima, Benedictia maxima (W. Dybowski, 1875) - (LITHOGLYPHIDAE)
- maxima, Anodontia maxima Martin, 1883 † - (LUCINIDAE) (FOSSIL)
- maxima, Lutraria maxima I.H. Jonas, 1844 - (MACTRIDAE)
- maxima, Raeta maxima Li, 1930 - syn of: Harvella elegans (Sowerby, 1825) - (MACTRIDAE)
- maxima, Raeta maxima C.C. Li, 1930 - syn of: Harvella elegans (Sowerby, 1825) - (MACTRIDAE)
- maxima, Lutraria maxima A.T. von Middendorff, 1849 - syn of: Tresus capax (A.A. Gould, 1850) - (MACTRIDAE)
- maxima, Apispiralia maxima C.F. Laseron, 1954 - (MANGELIIDAE)
- maxima, Propebela turricula maxima (O.A.L. Mörch, 1868) - (MANGELIIDAE)
- maxima, Margaritifera maxima H.L. Jameson, 1901 - syn of: Pinctada maxima (H.L. Jameson, 1901) - (MARGARITIFERIDAE)
- maxima, Melanopsis saulcyi maxima P. Dautzenberg, 1894 - (MELANOPSIDAE)
- maxima, Mytilus maxima J.S. Schröter, 1779 - syn of: Anodonta cygnea (C. Linnaeus, 1758) - (MYTILIDAE)
- maxima, Natica maxima A. Risso, 1826 - syn of: Naticarius hebraeus (T. Martyn, 1786) - (NATICIDAE)
- maxima, Nerita maxima J.F. Gmelin, 1791 - (NERITIDAE)
- maxima, Pisulina maxima Y. Kano & T. Kase, 2000 - (NERITILIIDAE)
- maxima, Nucinella maxima (K.H.J. Thiele & S.G.A. Jaeckel, 1931) - (NUCINELLIDAE)
- maxima, Oreohelix subrudis maxima H.A. Pilsbry, 1916 - (OREOHELICIDAE)
- maxima, Ostrea maxima L.H. Hupé, 1854 † - syn of: Crassostrea transitoria (L.H. Hupé, 1854 †) - (OSTREIDAE) (FOSSIL)
- maxima, Patella maxima D'Orbigny, 1841 - syn of: Scutellastra mexicana (W.J. Broderip & G.B. I Sowerby, 1829) - (PATELLIDAE)
- maxima, Pecten maxima (C. Linnaeus, 1758) - (PECTINIDAE)
- maxima, Pecten maxima C. Linnaeus, 1758 - syn of: Pecten maxima (C. Linnaeus, 1758) - (PECTINIDAE)
- maxima, Pectinodonta maxima (P. Dautzenberg, 1925) - (PECTINODONTIDAE)
- maxima, Reynellona maxima T. Kase, 1998 - (PICKWORTHIIDAE)
- maxima, Pleurodonte sinuata maxima (O.F. Müller, 1774) - (PLEURODONTIDAE)
- maxima, Gari maxima (G.P. Deshayes, 1855) - (PSAMMOBIIDAE)
- maxima, Gobraeus maxima (G.P. Deshayes, 1855) - syn of: Gari maxima (G.P. Deshayes, 1855) - (PSAMMOBIIDAE)
- maxima, Pinctada maxima (H.L. Jameson, 1901) - (PTERIIDAE)
- maxima, Pterotheca maxima Teichert, 1928 † - (PTEROTHECIDAE) (FOSSIL)
- maxima, Strangesta maxima (L. Pfeiffer, 1849) - (RHYTIDIDAE)
- maxima, Rostellaria maxima J. Price, 1873 † - (ROSTELLARIIDAE) (FOSSIL)
- maxima, Sagda maxima H.B. Baker, 1935 - (SAGDIDAE)
- maxima, Abra maxima G.B. III Sowerby, 1894 - syn of: Abra philippinensis (E.A. Smith, 1885) - (SEMELIDAE)
- maxima, Sphenoclymenia maxima (Münster, †) - (SPHENOCLYMENIIDAE) (FOSSIL)
- maxima, Albea maxima L. Pfeiffer, 1848 - syn of: Sphincterochila candidissima (J.P.R. Draparnaud, 1801) - (SPHINCTEROCHILIDAE)
- maxima, Transitrigonia maxima (Camacho & Olivero, 1985) † - (STEINMANELLIDAE) (FOSSIL)
- maxima, Rumina decollata maxima (O. Böttger, 1878) - (SUBULINIDAE)
- maxima, Succinea maxima H.W. Henshaw, 1904 - (SUCCINEIDAE)
- maxima, Megangulus maxima (T. Nagao, 1928 †) - (TELLINIDAE) (FOSSIL)
- maxima, Tridacna maxima (P.F. Röding, 1798) - (TRIDACNIDAE)
- maxima, Tridacna maxima (Roding, 1798 †) - (TRIDACNIDAE) (FOSSIL)
- maxima, Tridacna maxima P.F. Röding, 1798 - syn of: Tridacna maxima (P.F. Röding, 1798) - (TRIDACNIDAE)
- maxima, Anodonta maxima H. Drouët, 1889 - syn of: Anodonta cygnea (C. Linnaeus, 1758) - (UNIONIDAE)
- maxima, Unio maxima O.J.N. Moerch, 1864 - syn of: Unio tumidus A. Retzius, 1788 - (UNIONIDAE)
- maxima, Venus maxima H.E. Anton in R.A. Philippi, 1846 - syn of: Saxidomus gigantea (G.P. Deshayes, 1839) - (VENERIDAE)
- maxima, Serpula maxima G.B. I Sowerby, 1825 - syn of: Ceraesignum maximum (G.B. I Sowerby, 1825) - (VERMETIDAE)
- maxima, Zebina maxima L. Bozzetti, 2007 - (ZEBINIDAE)
- maxima citrina, Helicina maxima citrina C.B. Adams, 1851 - syn of: Alcadia maxima (G.B. Sowerby, 1842) - (HELICINIDAE)
- maxima elongata, Tridacna maxima elongata J.B.P.A. Lamarck, 1810 - (TRIDACNIDAE)
- maxima fossor, Tridacna maxima fossor C. Hedley, 1921 - syn of: Tridacna maxima (P.F. Röding, 1798) - (TRIDACNIDAE)
- maxima jacobensis, Sagda maxima jacobensis H.B. Baker, 1935 - (SAGDIDAE)
- maxima marisminus, Benedictia maxima marisminus T.Y. Sitnikova, 1987 - (LITHOGLYPHIDAE)
- maxima mearnsi, Ryssota maxima mearnsi P. Bartsch, 1938 - (CHRONIDAE)
- maxima noae, Tridacna maxima noae P.F. Röding, 1798 - syn of: Tridacna noae P.F. Röding, 1798 - (TRIDACNIDAE)
- Maxima-group, syn of: Genus Architectonica P.F. Rφding, 1798 (ARCHITECTONICIDAE)
- maximalis, Melanopsis praemorsa maximalis H. Schütt, 1974 - (MELANOPSIDAE)
- maximei, Taramelliceras maximei Quéreilhac, 2009 † - (OPPELIIDAE) (FOSSIL)
- maximiliana, Auris maximiliana S. Moricand, 1836 - (BULIMULIDAE)
- maximiliani, Ammonites maximiliani Klipstein, 1843 † - syn of: Proarcestes bicarinatus (Münster, 1841 †) - (AMMONITIDA (unassigned)) (FOSSIL)
- maximiliani, Halobia maximiliani E.A.L. Kittl, 1912 † - (HALOBIIDAE) (FOSSIL)
- maximiliani, Myoconcha maximiliani Klipstein, 1843 † - (KALENTERIDAE) (FOSSIL)
- maximiliani, Trochus maximiliani Klipstein, 1843 † - (TROCHIDAE) (FOSSIL)
- maximilianleuchtenberensis, Pseudomyoconcha maximilianleuchtenberensis † - (KALENTERIDAE) (FOSSIL)
- maximilicutiani, Alvania maximilicutiani D. Scuderi, 2014 - (RISSOIDAE)
- Maximites, Genus Maximites Miller & Furnish, 1957 (MAXIMITIDAE) (FOSSIL)
- MAXIMITIDAE Ruzhencev, 1960 - Family (CEPHALOPODA-AMMONOIDEA [Subclass]-GONIATITIDA [Order]-PSEUDOHALORITOIDEA [Superfamily]) (FOSSIL)
- maximovae, Juresanites maximovae Andrianov, 1985 † - (METALEGOCERATIDAE) (FOSSIL)
- maximum, Australiceras ramososeptatoides maximum (Rouchadze, 1938 †) - (ANCYLOCERATIDAE) (FOSSIL)
- maximum, Architectonica maximum R.A. Philippi, 1849 - syn of: Architectonica maxima R.A. Philippi, 1849 - (ARCHITECTONICIDAE)
- maximum, Diplomoceras maximum Olivero & Zinsmeister, 1989 † - syn of: Diplomoceras cylindraceum (J.L.M. Defrance, 1816 †) - (DIPLOMOCERATIDAE) (FOSSIL)
- maximum, Macroschisma maximum A. Adams, 1851 - (FISSURELLIDAE)
- maximum, Haustrum maximum (Powell & J.A. Bartrum, 1929 †) - (MURICIDAE) (FOSSIL)
- maximum, Buergliceras maximum (Burgle, 1956 †) - (PULCHELLIIDAE) (FOSSIL)
- maximum, Ceraesignum maximum (G.B. I Sowerby, 1825) - (VERMETIDAE)
- maximus, Bellerophon maximus Weir, 1931 † - (BELLEROPHONTIDAE) (FOSSIL)
- maximus, Penion maximus (G.W. Tryon, 1881) - (BUCCINIDAE)
- maximus, Clavilithes maximus (G.P. Deshayes, 1835 †) - (FASCIOLARIIDAE) (FOSSIL)
- maximus, Latirus maximus G.B. III Sowerby, 1893 - (FASCIOLARIIDAE)
- maximus, Goniatites maximus Bisat, 1934 † - syn of: Maxigoniatites globostriatus (A. Schmidt, 1925 †) - (GONIATITIDAE) (FOSSIL)
- maximus, Hamites maximus (Sowerby, 1814 †) - (HAMITIDAE) (FOSSIL)
- maximus, Knightites maximus E.L. Yochelson, 1960 † - (KNIGHTITIDAE) (FOSSIL)
- maximus, Limax maximus C. Linnaeus, 1758 - (LIMACIDAE)
- maximus, Megalobulimus maximus (G.B. I Sowerby, 1825) - (MEGALOBULIMIDAE)
- maximus, Thaumastus salteri maximus W.K. Weyrauch, 1967 - (MEGASPIRIDAE)
- maximus, Trophon maximus T.A. Verkrüzen, 1881 - syn of: Boreotrophon clathratus (C. Linnaeus, 1767) - (MURICIDAE)
- maximus, Sigaretus maximus R.A. Philippi, 1844 - syn of: Sinum cymba K.T. Menke, 1828 - (NATICIDAE)
- maximus, Nautilus maximus J.W. Hall † - syn of: Nephriticeras maximus (T.A. Conrad, 1838 †) - (NAUTILIDAE) (FOSSIL)
- maximus, Nephriticeras maximus (T.A. Conrad, 1838 †) - (NEPHRITICERATIDAE) (FOSSIL)
- maximus, Cyrtoceras maximus T.A. Conrad, 1838 † - syn of: Nephriticeras maximus (T.A. Conrad, 1838 †) - (ONCOCERIDA (unassigned)) (FOSSIL)
- maximus, Cultellus maximus (J.F. Gmelin, 1791) - (PHARIDAE)
- maximus, Atopos maximus W.E. Collinge, 1903 - (RATHOUISIIDAE)
- maximus, Amplogladius maximus (M. Rouault, 1849 †) - (ROSTELLARIIDAE) (FOSSIL)
- maximus, Tricornis maximus (K. Martin, 1883 †) - (STROMBIDAE) (FOSSIL)
- maximus, Obeliscus maximus H.A. Pilsbry, 1906 - (SUBULINIDAE)
- maximus, Tectus maximus F.C.L. Koch, 1844 - (TEGULIDAE)
- maximus, Alaskadiscus maximus Ebbestad & E.L. Yochelson, 2000 † - (TROPIDODISCIDAE) (FOSSIL)
- maximus huascari, Megalobulimus maximus huascari (J.J. von Tschudi, 1852) - (MEGALOBULIMIDAE)
- maximus jacobeus, Pecten maximus jacobeus C. Linnaeus, 1758 - syn of: Pecten jacobaea (C. Linnaeus, 1758) - (PECTINIDAE)
- maximus princeps, Obeliscus maximus princeps H.A. Pilsbry, 1906 - (SUBULINIDAE)
- maximus sulcicostatus, Pecten maximus sulcicostatus G.B. II Sowerby, 1842 - syn of: Pecten sulcicostatus G.B. II Sowerby, 1842 - (PECTINIDAE)
- maximus vestitus, Megalobulimus maximus vestitus (H.A. Pilsbry, 1926) - (MEGALOBULIMIDAE)
- maxinae, Otohoplites maxinae Casey † - (HOPLITIDAE) (FOSSIL)
- maxmarrowi, Thaluta maxmarrowi (W.O. Cernohorsky, 1980) - (COSTELLARIIDAE)
- maxmarrowi, Pusia maxmarrowi W.O. Cernohorsky, 1980 - syn of: Thaluta maxmarrowi (W.O. Cernohorsky, 1980) - (COSTELLARIIDAE)
- maxvillensis, Wilkingia maxvillensis (R.P. Whitfield, 1882 †) - (SANGUINOLITIDAE) (FOSSIL)
- Maxwellella, syn of: Genus Scissurella D'Orbigny, 1824 (SCISSURELLIDAE)
- Maxwellella, syn of: Genus Scissurella D'Orbigny, 1824 (SCISSURELLIDAE)
- maxwelli, Globularia maxwelli A.G. Beu & B.A. Marshall, 2011 † - (AMPULLINIDAE) (FOSSIL)
- maxwelli, Pododesmus maxwelli A.G. Beu, 1967 † - (ANOMIIDAE) (FOSSIL)
- maxwelli, Borsonella maxwelli C. Nielsen, 2003 † - (BORSONIIDAE) (FOSSIL)
- maxwelli, Bothriembryon maxwelli W. Kobelt, 1901 - (BOTHRIEMBRYONTIDAE)
- maxwelli, Pollia maxwelli (A.A. Olsson & A. Harbison, 1953 †) - (BUCCINIDAE) (FOSSIL)
- maxwelli, Gamopleura maxwelli A. Grebneff, A.W. Janssen & Lee, 2011 † - (CAVOLINIIDAE) (FOSSIL)
- maxwelli, Clavagella maxwelli B. Morton & A. Grebneff, 2011 † - (CLAVAGELLIDAE) (FOSSIL)
- maxwelli, Spissatella maxwelli K.S. Collins, D.M. Crampton & G. Hannah, 2014 † - (CRASSATELLIDAE) (FOSSIL)
- maxwelli, Funiscala maxwelli H.J. Finlay, 1930 - (EPITONIIDAE)
- maxwelli, Latirus maxwelli (H.A. Pilsbry, 1939) - (FASCIOLARIIDAE)
- maxwelli, Haloceras maxwelli A.G. Beu & B.A. Marshall, 2011 † - (HALOCERATIDAE) (FOSSIL)
- maxwelli, Limatula maxwelli C.A. Fleming, 1978 † - (LIMIDAE) (FOSSIL)
- maxwelli, Neilo maxwelli J.D. Stilwell & Zinsmeister, 1992 † - (MALLETIIDAE) (FOSSIL)
- maxwelli, Enixotrophon maxwelli (B.A. Marshall & R. Houart, 2011) - (MURICIDAE)
- maxwelli, Strombinophos maxwelli A.A. Olsson & A. Harbison, 1953 † - syn of: Pollia maxwelli (A.A. Olsson & A. Harbison, 1953 †) - (NASSARIIDAE) (FOSSIL)
- maxwelli, Saccella maxwelli A.G. Beu, 2006 - (NUCULANIDAE)
- maxwelli, Pellasimnia maxwelli A.G. Beu & B.A. Marshall, 2011 † - (OVULIDAE) (FOSSIL)
- maxwelli, Notocrater maxwelli B.A. Marshall, 1986 † - (PSEUDOCOCCULINIDAE) (FOSSIL)
- maxwelli, Microcheilus maxwelli K. Bandel, 2010 † - (SABRINELLIDAE) (FOSSIL)
- maxwelli, Fluxinella maxwelli B.A. Marshall, 1983 † - (SEGUENZIIDAE) (FOSSIL)
- maxwelli, Williamia maxwelli B.A. Marshall, 1981 † - (SIPHONARIIDAE) (FOSSIL)
- maxwelli, Asthenothaerus maxwelli B.A. Marshall, 2002 - (THRACIIDAE)
- maxwelli, Acremodontina maxwelli B.A. Marshall, 1995 † - (TROCHACLIDIDAE) (FOSSIL)
- maxwelli, Fulgurofusus maxwelli M.G. Harasewych, 2011 - (TURBINELLIDAE)
- maxwelli, Holospira maxwelli H.A. Pilsbry, 1953 - (UROCOPTIDAE)
- maxwelli, Mitreola maxwelli Renard, 1994 † - (VOLUTOMITRIDAE) (FOSSIL)
- Maxwellia, Genus Maxwellia J.L.Jr. Baily, 1950 (MURICIDAE)
- Maxwellinatica, Genus Maxwellinatica Beu & Marshall, 2011 (NATICIDAE) (FOSSIL)
- maxwellorum, Neritina maxwellorum A.G. Beu & B.A. Marshall, 2011 † - (NERITIDAE) (FOSSIL)
- maxwellsmithi, Dolichostyla virgata maxwellsmithi J.T.L. McGinty, 1932 - (BRADYBAENIDAE)
- maxwellsmithi, Leptarionta maxwellsmithi H.A. Pilsbry, 1930 - (XANTHONYCHIDAE)
- maya, Dauciconus maya (E.J. Petuch & D.M. Sargent, 2011) - (CONIDAE)
- maya, Volvarina maya J. Espinosa & J.A. Ortea, 1998 - (MARGINELLIDAE)
- maya, Condylonucula maya R.C. Moore, 1977 - (NUCULIDAE)
- maya, Octopus maya N.A. Voss & Solís Ramírez, 1966 - (OCTOPODIDAE)
- maya, Oliva maya E.J. Petuch & D.M. Sargent, 1986 - (OLIVIDAE)
- maya, Planorbis maya P.M.A. Morelet, 1849 - syn of: Biomphalaria havanensis (L. Pfeiffer, 1839) - (PLANORBIDAE)
- maya, Rissoa maya (M. Yokoyama, 1926) - (RISSOIDAE)
- maya, Miradiscops maya (H.A. Pilsbry, 1920) - (SCOLODONTIDAE)
- maya, Volutaxis maya (J.C. Bequaert & W.J. Clench, 1931) - (SPIRAXIDAE)
- mayabe, Olivella mayabe J. Espinosa & J.A. Ortea, 1998 - (OLIVELLIDAE)
- mayabequensis, Dentimargo mayabequensis J. Espinosa & J.A. Ortea, 2015 - (MARGINELLIDAE)
- Mayabina, Genus Mayabina J.D. Taylor, 2003 (PHYSIDAE)
- mayacensis, Lobatus mayacensis H.I. Tucker & D. Wilson, 1933 † - (STROMBIDAE) (FOSSIL)
- mayacensis holeylandicus, Lobatus mayacensis holeylandicus E.J. Petuch, 1994 † - (STROMBIDAE) (FOSSIL)
- mayae, Kasperia mayae (H.H. Godwin-Austen, 1914) - (LIMACIDAE)
- mayaguanaensis, Crassispira mayaguanaensis P.J. Fallon, 2011 - (PSEUDOMELATOMIDAE)
- mayaguensis, Conus mayaguensis G.W. Nowell-Usticke, 1968 - syn of: Purpuriconus cardinalis (C.H. Hwass in J.G. Bruguière, 1792) - (CONIDAE)
- mayaguezensis, Pecten mayaguezensis W.H. Dall & C.T. Simpson, 1901 - syn of: Aequipecten lineolaris (J.B.P.A. Lamarck, 1819) - (PECTINIDAE)
- Mayaites, Genus Mayaites Spath, 1924 (MAYAITIDAE) (FOSSIL)
- MAYAITIDAE Spath, 1928 - Family (CEPHALOPODA-AMMONOIDEA [Subclass]-AMMONITIDA [Order]-STEPHANOCERATOIDEA [Superfamily]) (FOSSIL)
- mayajiguense, Farcimen camagueyanum mayajiguense C. de la Torre & P. Bartsch, 1942 - (MEGALOMASTOMIDAE)
- mayajiguensis, Centralia mayajiguensis (C. de la Torre, 1911) - (UROCOPTIDAE)
- mayana, Noctepuna mayana (C. Hedley, 1899) - (CAMAENIDAE)
- mayana, Munditia mayana (R. Tate, 1899) - (LIOTIIDAE)
- mayana, Turbonilla mayana F.C. Baker, G.D. Hanna & A.M. Strong, 1928 - (PYRAMIDELLIDAE)
- mayana, Paramontana mayana (C. Hedley, 1922) - (RAPHITOMIDAE)
- mayana, Pseudodaphnella mayana C. Hedley, 1922 - syn of: Paramontana mayana (C. Hedley, 1922) - (RAPHITOMIDAE)
- mayaorum, Mesembrinus mayaorum H.A. Rehder, 1966 - (BULIMULIDAE)
- mayariense, Farcimen ungula mayariense C. de la Torre & P. Bartsch, 1942 - (MEGALOMASTOMIDAE)
- mayariense, Chondropoma virgineum mayariense C.G. Aguayo, 1953 - (POMATIIDAE)
- mayariensis, Annularisca mayariensis C. de la Torre & P. Bartsch, 1941 - (POMATIIDAE)
- mayariensis, Ramsdenia nobilitata mayariensis (C. de la Torre & P. Bartsch, 1941) - (POMATIIDAE)
- mayariensis, Chondropoma chordatum mayariensis (C. de la Torre & P. Bartsch, 1941) - (POMATIIDAE)
- mayariensis canapuensis, Annularisca mayariensis canapuensis C. de la Torre & P. Bartsch, 1941 - (POMATIIDAE)
- mayariensis welchi, Annularisca mayariensis welchi C. de la Torre & P. Bartsch, 1941 - (POMATIIDAE)
- mayarina, Emoda mayarina (F. Poey, 1854) - (HELICINIDAE)
- mayarina, Hojeda mayarina C.G. Aguayo, 1953 - (SAGDIDAE)
- mayarina gutierrezi, Emoda mayarina gutierrezi (C.G. Aguayo & M.L. Jaume, 1954) - (HELICINIDAE)
- mayarina mirandensis, Emoda mayarina mirandensis (C.G. Aguayo & M.L. Jaume, 1954) - (HELICINIDAE)
- mayasana, Aegista mayasana M. Azuma, 1969 - (BRADYBAENIDAE)
- Mayaxis, Genus Mayaxis F.G. Thompson, 1995 (SPIRAXIDAE)
- Mayena, syn of: Genus Ranella J.B.P.A. Lamarck, 1816 (RANELLIDAE)
- mayense, Farcimen ungula mayense C. de la Torre & P. Bartsch, 1942 - (MEGALOMASTOMIDAE)
- mayense, Chondropoma auberianum mayense C. de la Torre & P. Bartsch, 1938 - (POMATIIDAE)
- mayensis, Noetia mayensis C.J. Maury, 1925 † - (NOETIIDAE) (FOSSIL)
- mayensis, Annularisca mayensis C. de la Torre & P. Bartsch, 1941 - (POMATIIDAE)
- mayensis, Gongylostomella mayensis (C. de la Torre & H.F. Ramsden, 1915) - (UROCOPTIDAE)
- mayeri, Astarte mayeri A.E.M. Cossmann & M.A. Peyrot † - (ASTARTIDAE) (FOSSIL)
- mayeri, Cerithium obliquistoma mayeri P. Doderlein, 1862 - (CERITHIIDAE)
- mayeri, Triptychia mayeri H. Nordsieck, 1998 † - (FILHOLIIDAE) (FOSSIL)
- mayeri, Parhydrobia mayeri (Morgan, 1920 †) - (HYDROBIIDAE) (FOSSIL)
- mayeri, Candidula mayeri (G.P.L.K. Gude, 1914) - (HYGROMIIDAE)
- mayeri, Nassarius mayeri (L.M.D. Bellardi, 1882 †) - (NASSARIIDAE) (FOSSIL)
- mayeri, Theodoxus mayeri (C.G. Semper, 1867 †) - (NERITIDAE) (FOSSIL)
- mayeri, Nucula mayeri M. Hörnes, 1865 † - (NUCULIDAE) (FOSSIL)
- mayeri, Seraphs mayeri P.O. Jung, 1974 † - (SERAPHSIDAE) (FOSSIL)
- Mayeria, syn of: Genus Fusinus C.S. Rafinesque, 1815 (FASCIOLARIIDAE)
- Mayeria, Subgenus Pugilina (Mayeria) Bellardi, 1872 (MELONGENIDAE) (FOSSIL)
- Mayesella, Genus Mayesella M.R. Cooper, 2015 (IOTRIGONIIDAE) (FOSSIL)
- mayesense, Orthonychia mayesense Snider, 1915 † - (ORTHONYCHIIDAE) (FOSSIL)
- mayesensis, Aviculopecten mayesensis Snider, 1915 † - (AVICULOPECTINIDAE) (FOSSIL)
- mayfieldensis, Neodeshayesites mayfieldensis (Youn, 1974 †) - (DESHAYESITIDAE) (FOSSIL)
- mayfieldensis, Hypacanthoplites mayfieldensis Youn, 1974 † - syn of: Neodeshayesites mayfieldensis (Youn, 1974 †) - (PARAHOPLITIDAE) (FOSSIL)
- mayhillae, Granallodiscus mayhillae B.A. Marshall & G.M. Barker, 2008 - (CHAROPIDAE)
- mayhillae, Climocella mayhillae J.F. Goulstone, 1997 - (CHAROPIDAE)
- mayhillae, Cytora mayhillae B.A. Marshall & G.M. Barker, 2007 - (LIAREIDAE)
- mayi, Notoplax mayi (E.A. Ashby, 1922) - (ACANTHOCHITONIDAE)
- mayi, Callochiton mayi W.G. Torr, 1912 - (CALLOCHITONIDAE)
- mayi, Surcula mayi G.D. Hanna & Israelsky, 1925 † - (CLAVATULIDAE) (FOSSIL)
- mayi, Cocculinella mayi H.J. Finlay, 1926 - syn of: Tectisumen mayi (H.J. Finlay, 1926) - (COCCULINELLIDAE)
- mayi, Cuna mayi A.W.B. Powell, 1930 - (CONDYLOCARDIIDAE)
- mayi, Notocypraea comptonii mayi (R.H. Beddome, 1898) - (CYPRAEIDAE)
- mayi, Habroconus mayi (F.C. Baker, 1914) - (EUCONULIDAE)
- mayi, Eulima mayi R. Tate, 1900 - syn of: Melanella augur (G.F. Angas, 1865) - (EULIMIDAE)
- mayi, Melanella mayi R. Tate, 1900 - syn of: Melanella augur (G.F. Angas, 1865) - (EULIMIDAE)
- mayi, Glycymeris mayi B.C. Cotton, 1947 - (GLYCYMERIDIDAE)
- mayi, Ischnochiton mayi H.A. Pilsbry, 1895 - (ISCHNOCHITONIDAE)
- mayi, Tectisumen mayi (H.J. Finlay, 1926) - (LEPETELLIDAE)
- mayi, Notoacmea mayi (W.L. May, 1923) - (LOTTIIDAE)
- mayi, Myrtea mayi J.H. Gatliff & C.J. Gabriel, 1911 - (LUCINIDAE)
- mayi, Nucula mayi (T. Iredale, 1930) - (NUCULIDAE)
- mayi, Pronucula mayi T. Iredale, 1930 - syn of: Nucula mayi (T. Iredale, 1930) - (NUCULIDAE)
- mayi, Taranis mayi (J.C. Verco, 1909) - (RAPHITOMIDAE)
- mayi, Ethminolia mayi J.A. Kershaw, 1955 - syn of: Ethminolia probabilis T. Iredale, 1924 - (TROCHIDAE)
- mayii, Dentimargo mayii (R. Tate, 1900) - (MARGINELLIDAE)
- mayii, Orbitestella mayii R. Tate, 1899 - syn of: Microcarina mayii (R. Tate, 1899) - (ORBITESTELLIDAE)
- mayii, Chrysallida mayii (R. Tate, 1898) - (PYRAMIDELLIDAE)
- mayii, Microcarina mayii (R. Tate, 1899) - (SEGUENZIOIDEA (UNASSIGNED))
- maylandensis, Crenella maylandensis H.D. Russell & Landes, 1937 † - (MYTILIDAE) (FOSSIL)
- maylandensis, Tellina maylandensis H.D. Russell & Landes, 1937 † - (TELLINIDAE) (FOSSIL)
- maynardi, Cerion maynardi H.A. Pilsbry & E.G. Vanatta, 1895 - (CERIONIDAE)
- maynardi, Cerion maynardi W.H. Dall, 1905 - syn of: Strophiops lentiginosa (C.J. Maynard, 1889) - (CERIONIDAE)
- maynardi, Urticicola mounierensis maynardi (E. Caziot, 1909) - (HYGROMIIDAE)
- maynardi, Opisthosiphon maynardi E.G. Vanatta, 1920 - (POMATIIDAE)
- Maynardia, syn of: Subgenus Cerion (Strophiops) W.H. Dall, 1894 (CERIONIDAE)
- maynci, Guizhoupecten maynci (Newell, 1955 †) - (STREBLOCHONDRIIDAE) (FOSSIL)
- Mayneoceras, Genus Mayneoceras Selwood, 1960 (PRIONOCERATIDAE) (FOSSIL)
- maynot, syn of: Genus Molopophorus W.M. Gabb, 1869 (BUCCINIDAE) (FOSSIL)
- maynotensis, Zonarina maynotensis L. Dolin & P. Lozouet, 2004 † - (CYPRAEIDAE) (FOSSIL)
- mayoi, Strophiops mayoi C.J. Maynard & W.F. Clapp, 1921 - (CERIONIDAE)
- mayoi, Retusa mayoi (W.H. Dall, 1889) - (RETUSIDAE)
- mayoi, Hastula mayoi E.W. Vredenburg, 1921 † - (TEREBRIDAE) (FOSSIL)
- mayori, Gadila mayori (J. Henderson, 1920) - (GADILIDAE)
- mayori, Opisthosiphon mayori P. Bartsch, 1946 - (POMATIIDAE)
- mayori, Rissoina mayori W.H. Dall, 1927 - (RISSOINIDAE)
- mayoriana, Puzosia mayoriana (A.V.M.D. D'Orbigny, 1841 †) - (DESMOCERATIDAE) (FOSSIL)
- Mayorithyas, syn of: Genus Maorithyas C.A. Fleming, 1950 (THYASIRIDAE)
- mayottensis, Gulella mayottensis (M. Connolly, 1885) - (STREPTAXIDAE)
- mayrani, Sphincterochila mayrani T. Kira, 1955 - (SPHINCTEROCHILIDAE)
- mayrani turrita, Sphincterochila mayrani turrita (J. Gassies, 1856) - (SPHINCTEROCHILIDAE)
- mayri, Aspastus miltocheilus mayri W.J. Clench, 1941 - (BOTHRIEMBRYONTIDAE)
- mayri, Papuina mayri B. Rensch, 1934 - (CAMAENIDAE)
- mayumbensis, Achatina bandeirana mayumbensis T.E. Crowley & T. Pain - (ACHATINIDAE)
- mayumbensis, Zonitarion mayumbensis G.A. de Mol, 1970 - (UROCYCLIDAE)
- maywebbae, Elliptio maywebbae B.H. Wright, 1934 - syn of: Elliptio jayensis I. Lea, 1838 - (UNIONIDAE)
- mazaevi, Vebericochlis mazaevi A. Nützel & Nakazawa, 2012 † - (MURCHISONIIDAE) (FOSSIL)
- mazagonica, Gibberula mazagonica (J.C. Melvill, 1893) - (CYSTISCIDAE)
- mazagonica, Marginella mazagonica J.C. Melvill, 1893 - syn of: Gibberula mazagonica (J.C. Melvill, 1893) - (MARGINELLIDAE)
- mazandaranensis, Bithynia mazandaranensis P. Glöer & V.M. Pešic, 2012 - (BITHYNIIDAE)
- mazandaranica, Euxina mazandaranica H. Nordsieck, 1994 - (CLAUSILIIDAE)
- mazanderanica, Euxina mazanderanica H. Nordsieck, 1994 - syn of: Euxina mazandaranica H. Nordsieck, 1994 - (CLAUSILIIDAE)
- mazapilense, Diptychoceras mazapilense Bose, 1923 † - (PTYCHOCERATIDAE) (FOSSIL)
- Mazapilites, Genus Mazapilites Burckhardt, 1906 (OPPELIIDAE) (FOSSIL)
- mazaravallensis, Cerithium vulgatum mazaravallensis A. Cecalupo, 2003 - (CERITHIIDAE)
- mazardrikense, Cenoceras mazardrikense Sarker, 1964 † - (CENOCERATIDAE) (FOSSIL)
- mazarensis, Pleurotomaria mazarensis C. Gemmellaro, 1889 † - (PLEUROTOMARIIDAE) (FOSSIL)
- mazartageensis, Aviculovulsa mazartageensis Lan & Wei 1995 † - (MALLEIDAE) (FOSSIL)
- mazartakensis, Palaeomutela mazartakensis P. Wei † - (PALAEOMUTELIDAE) (FOSSIL)
- Mazastele, syn of: Genus Calliotropis G. Seguenza, 1903 (CALLIOTROPIDAE)
- mazatlandica, Cellana mazatlandica (G.B. II Sowerby, 1839) - (NACELLIDAE)
- mazatlandica, Patella mazatlandica G.B. II Sowerby, 1839 - syn of: Cellana mazatlandica (G.B. II Sowerby, 1839) - (PATELLIDAE)
- Mazatlania, Genus Mazatlania W.H. Dall, 1913 (COLUMBELLIDAE)
- mazatlanica, Anadara mazatlanica (L.G. Hertlein & A.M. Strong, 1943) - (ARCIDAE)
- mazatlanica, Cerithium mazatlanica P.P. Carpenter, 1867 - syn of: Cerithium eburneum J.G. Bruguière, 1792 - (CERITHIIDAE)
- mazatlanica, Ruthia mazatlanica D.R. Shasky, 1970 - (COLUMBELLIDAE)
- mazatlanica, Opalia mazatlanica W.H. Dall, 1908 - syn of: Opalia infrequens (C.B. Adams, 1852) - (EPITONIIDAE)
- mazatlanica, Diodora mazatlanica P.P. Carpenter, 1857 - syn of: Diodora inaequalis Sowerby, 1835 - (FISSURELLIDAE)
- mazatlanica, Parvilucina mazatlanica (Carpenter, 1857) - (LUCINIDAE)
- mazatlanica, Tricolia mazatlanica A.M. Strong, 1928 - (PHASIANELLIDAE)
- mazatlanica, Cerithidea mazatlanica H.F. Carpenter, 1857 - (POTAMIDIDAE)
- mazatlanica, Pinctada mazatlanica S.C.T. Hanley, 1855 - (PTERIIDAE)
- mazatlanica, Toltecia mazatlanica (L. Pfeiffer, 1856) - (PUNCTIDAE)
- mazatlanica, Pyramidella mazatlanica W.H. Dall & P. Bartsch, 1909 - (PYRAMIDELLIDAE)
- mazatlanica, Daphnella mazatlanica H.A. Pilsbry & H.N. Lowe, 1932 - (RAPHITOMIDAE)
- mazatlanica, Microglyphis mazatlanica (W.H. Dall, 1908) - (RINGICULIDAE)
- mazatlanica, Rissoina mazatlanica P. Bartsch, 1915 - (RISSOINIDAE)
- mazatlanica, Singleya mazatlanica (E.C. Von Martens, 1891) - (SPIRAXIDAE)
- mazatlanica, Leptopeas micra mazatlanica H.A. Pilsbry, 1931 - (SUBULINIDAE)
- mazatlanica, Tellina mazatlanica G.P. Deshayes, 1855 - syn of: Psammotreta pura (A.A. Gould, 1853) - (TELLINIDAE)
- mazatlanica, Sonoraloa mazatlanica (P. Bartsch, 1943) - (UROCOPTIDAE)
- mazatlanica abbreviata, Singleya mazatlanica abbreviata (E.C. Von Martens, 1891) - (SPIRAXIDAE)
- mazatlanica albonodosa, Cerithidea mazatlanica albonodosa A.A. Gould & P.P. Carpenter, 1857 - syn of: Cerithidea albonodosa A.A. Gould & P.P. Carpenter, 1857 - (POTAMIDIDAE)
- mazatlanica hegewischii, Cerithidea mazatlanica hegewischii (R.A. Philippi, 1848) - (POTAMIDIDAE)
- mazatlanica hegewischii californica, Cerithidea mazatlanica hegewischii californica (S.S. Haldeman, 1840) - (POTAMIDIDAE)
- mazatlanica sacrata, Cerithidea mazatlanica sacrata A.A. Gould, 1849 - (POTAMIDIDAE)
- mazatlanicus, Heliacus mazatlanicus H.A. Pilsbry & H.N. Lowe, 1932 - (ARCHITECTONICIDAE)
- mazatlanicus, Boreotrophon mazatlanicus W.H. Dall, 1902 - (MURICIDAE)
- mazatlanicus, Turbo mazatlanicus H.A. Pilsbry & H.N. Lowe, 1932 - (TURBINIDAE)
- mazatlantica, Tricolia mazatlantica A.M. Strong, 1928 - syn of: Tricolia mazatlanica A.M. Strong, 1928 - (PHASIANELLIDAE)
- mazda, Thuridilla mazda J.A. Ortea & J. Espinosa, 2000 - (PLAKOBRANCHIDAE)
- mazee, Thersites mazee J.W. Brazier, 1878 - (CAMAENIDAE)
- mazei, Bulimulus mazei J.C.H. Crosse, 1874 - syn of: Protoglyptus mazei (J.C.H. Crosse, 1874) - (BULIMULIDAE)
- mazei, Conasprella mazei (G.P. Deshayes, 1874) - (CONIDAE)
- mazei, Dalliconus mazei (G.P. Deshayes, 1874) - syn of: Conasprella mazei (G.P. Deshayes, 1874) - (CONIDAE)
- mazei, Geostilbia mazei J.C.H. Crosse, 1883 - (FERUSSACIIDAE)
- mazei, Protoglyptus mazei (J.C.H. Crosse, 1874) - (ORTHALICIDAE)
- Mazenoticeras, Genus Mazenoticeras Frau & al., 2016 (HIMALAYITIDAE) (FOSSIL)
- Mazescala, syn of: Genus Epitonium P.F. Rφding, 1798 (EPITONIIDAE)
- Mazescala, syn of: Genus Epitonium P.F. Rφding, 1798 (EPITONIIDAE)
- mazetieri, Tauromeniceras mazetieri (Dubar, 1927 †) - (HILDOCERATIDAE) (FOSSIL)
- mazlea, Glossus mazlea L.C. Glenn, 1904 † - (GLOSSIDAE) (FOSSIL)
- mazonensis, Aviculopecten mazonensis A.H. Worthen, 1890 † - (AVICULOPECTINIDAE) (FOSSIL)
- mazoviensis, Mathilda mazoviensis A. Kaim, 2004 † - (MATHILDIDAE) (FOSSIL)
- mazumbaiense, Parennea mazumbaiense P. Tattersfield, 1998 - (STREPTAXIDAE)
- mazumbaiensis, Sitala mazumbaiensis B. Verdcourt - (ARIOPHANTIDAE)
- mazumbiensis, Ptychotrema mazumbiensis P. Tattersfield, 1999 - (STREPTAXIDAE)
- mazuranici, Viviparus mazuranici Š. Brusina, 1902 † - (VIVIPARIDAE) (FOSSIL)
- mazuricus, Perisphinctes mazuricus Bukowski 1887 † - (PERISPHINCTIDAE) (FOSSIL)
- mazyckii, Chione mazyckii W.H. Dall, 1902 - (VENERIDAE)
- Mazza, syn of: Genus Turbinella J.B.P.A. Lamarck, 1799 (TURBINELLIDAE)
- Mazzalina, Genus Mazzalina Conrad, 1960 (FASCIOLARIIDAE) (FOSSIL)
- mazzarensis, Cenoceras mazzarensis (Tagliarini, 1901 †) - (CENOCERATIDAE) (FOSSIL)
- mazzarensis, Nautilus mazzarensis Tagliarini, 1901 † - syn of: Cenoceras mazzarensis (Tagliarini, 1901 †) - (NAUTILIDAE) (FOSSIL)
- mazzepae, Monetaria mazzepae F.P. Jousseaume 1884 † - (CYPRAEIDAE) (FOSSIL)
- mazzepae, Cypropterina mazzepae A. De Gregorio, 1880 † - (EOCYPRAEIDAE) (FOSSIL)
- mazzettii, Gemmellaroceras mazzettii (C. Gemmellaro, 1884 †) - (POLYMORPHITIDAE) (FOSSIL)
- mazzolenii, Promytilus mazzolenii Larghi, 2005 † - (MYTILIDAE) (FOSSIL)
- mazzolii, Gradiconus mazzolii E.J. Petuch & D.M. Sargent, 2011 - syn of: Gradiconus burryae (W.J. Clench, 1942) - (CONIDAE)
- mazzullii, Erctella mazzullii (G.J. De Cristofori & G. Jan, 1832) - (HELICIDAE)
- mbalavensis, Erosaria mbalavensis H.S. Ladd, 1945 - syn of: Erosaria poraria (C. Linnaeus, 1758) - (CYPRAEIDAE)
- mbalavuana, Lauopa mbalavuana G.A. Solem, 1983 - (CHAROPIDAE)
- mbalavuana, Tridacna mbalavuana H.S. Ladd, 1934 - (TRIDACNIDAE)
- mbalavuensis, Erosaria mbalavuensis H.S. Ladd, 1945 - syn of: Erosaria poraria (C. Linnaeus, 1758) - (CYPRAEIDAE)
- mbengensis, Placostylus mbengensis C.M. Cooke, 1942 - (BOTHRIEMBRYONTIDAE)
- mbereensis, Joculator mbereensis Cecalupo & Perugia, 2017 - (CERITHIOPSIDAE)
- mbotyiensis, Marginella mbotyiensis A. Aiken, 2014 - (MARGINELLIDAE)
- mbotyiensis, Murexsul mbotyiensis (R. Houart, 1991) - (MURICIDAE)
- mcalesteri, Silicula mcalesteri J.A. Allen & A. Sanders, 1973 - (SILICULIDAE)
- mcbeanianus, Fauxulus mcbeanianus J.C. Melvill & J.H. Ponsonby, 1901 - (FAUXULIDAE)
- mcbridei, Harmoniconus mcbridei (F.Jr. Lorenz, 2005) - (CONIDAE)
- mccarthyi, Rinetrigonia mccarthyi (Cooper, 1989 †) - (PTEROTRIGONIIDAE) (FOSSIL)
- mccauslandi, Vexillum mccauslandi R. Salisbury & J. Wolff, 2005 - (COSTELLARIIDAE)
- mccharlesi, Wilsonoceras mccharlesi (J.J.F. Whiteaves †) - (APSIDOCERATIDAE) (FOSSIL)
- mcchesneyana, Palaeoneilo mcchesneyana (Girty, 1910 †) - (MALLETIIDAE) (FOSSIL)
- mcchesneyana, Yoldia mcchesneyana Girty, 1910 † - syn of: Palaeoneilo mcchesneyana (Girty, 1910 †) - (YOLDIIDAE) (FOSSIL)
- mccleeryi, Cryptospira mccleeryi A. Wakefield, 2010 - (MARGINELLIDAE)
- mcclellandi, Clementia mcclellandi J.R. le B. Tomlin, 1921 - syn of: Clementia papyracea (J.F. Gmelin, 1791) - (VENERIDAE)
- Mccluskiceras, Genus Mccluskiceras Krφger & Landing, 2008 (PROTEROCAMEROCERATIDAE) (FOSSIL)
- mccoiana, Micrarionta mccoiana G. Willett, 1935 - (HELMINTHOGLYPTIDAE)
- mcconnelli, Hollandites mcconnelli McLearn, 1946 † - syn of: Holcoptychites recopei J.H.F. Douvillé, 1910 † - (BEYRICHITIDAE) (FOSSIL)
- mcconnelli, Subarcthoplites mcconnelli (J.J.F. Whiteaves, 1893 †) - (HOPLITIDAE) (FOSSIL)
- mcconnelli, Nathorstites mcconnelli J.J.F. Whiteaves, 1889 † - syn of: Nathorstites macconnelli (J.J.F. Whiteaves, 1889 †) - (NATHORSTITIDAE) (FOSSIL)
- mcconnelli, Popanoceras mcconnelli J.J.F. Whiteaves, 1889 † - syn of: Nathorstites macconnelli (J.J.F. Whiteaves, 1889 †) - (PARAPOPANOCERATIDAE) (FOSSIL)
- mcconnelli, Yoldia mcconnelli H.D. Russell & Landes, 1937 † - (YOLDIIDAE) (FOSSIL)
- mccordi, Alasmidens mccordi (E.W. Athearn, 1964) - (UNIONIDAE)
- mccorryi, Kimboraga mccorryi G.A. Solem, 1985 - (CAMAENIDAE)
- mccoyi, Aviculopecten mccoyi F.B. Meek & Hayden, 1864 † - (AVICULOPECTINIDAE) (FOSSIL)
- mccoyi, Orecopia mccoyi (Walcott, 1884 †) - (OMPHALOTROCHIDAE) (FOSSIL)
- mccoyi, Pholadella mccoyi (Reed, 1917 †) - (PACHYDOMIDAE) (FOSSIL)
- mccoyi, Notopeplum mccoyi (J.E. Tenison-Woods, 1877 †) - (VOLUTIDAE) (FOSSIL)
- mccoyi translucidum, Notopeplum mccoyi translucidum J.C. Verco, 1896 - syn of: Notopeplum translucidum (J.C. Verco, 1896) - (VOLUTIDAE)
- mccullochi, Gryphaea mccullochi Sowerby, 1826 † - (GRYPHAEIDAE) (FOSSIL)
- mcdonaldi, Eungarion mcdonaldi J. Stanisic, 1993 - (HELICARIONIDAE)
- mcdonaldi, Limacia mcdonaldi Uribe, Sepúlveda, Goddard & Valdés, 2017 - (POLYCERIDAE)
- mcdougalli, Ephippodonta mcdougalli R. Tate, 1889 - (GALEOMMATIDAE)
- mcevoyi, Seymourites mcevoyi McLearn, 1928 † - (KOSMOCERATIDAE) (FOSSIL)
- mcevoyi, Martesia mcevoyi McLearn, 1929 † - (PHOLADIDAE) (FOSSIL)
- mcfarlandi, Chromodoris mcfarlandi T.D.A. Cockerell, 1902 - syn of: Felimida macfarlandi (T.D.A. Cockerell, 1901) - (CHROMODORIDIDAE)
- mcfarlanei, Glaucus mcfarlanei Churchill, Valdés & D. Ó Foighil, 2014 - (GLAUCIDAE)
- mcfarlani, Reedsoceras mcfarlani Flower, 1946 † - (WESTONOCERATIDAE) (FOSSIL)
- mcgeei, Anomia mcgeei Clark, 1895 † - syn of: Anomia ruffini T.A. Conrad, 1843 † - (ANOMIIDAE) (FOSSIL)
- mcgerriglei, Campbelloceras mcgerriglei Ulrich & al., 1942 † - (TARPHYCERATIDAE) (FOSSIL)
- mcgilpi, Costatophora mcgilpi (B.C. Cotton, 1952) - (TRIPHORIDAE)
- mcgilpi, Teretriphora mcgilpi B.C. Cotton, 1952 - syn of: Costatophora mcgilpi (B.C. Cotton, 1952) - (TRIPHORIDAE)
- mcginty, Liguus fasciatus mcginty W.J. Clench, 1934 - (ORTHALICIDAE)
- mcginty, Distorsio mcginty W.K. Emerson & E.L. Puffer, 1954 - syn of: Distorsio constricta mcgintyi W.K. Emerson & E.L. Puffer, 1953 - (PERSONIDAE)
- mcgintyi, Plekocheilus mcgintyi H.B. Baker, 1963 - (AMPHIBULIMIDAE)
- mcgintyi, Helicostyla mcgintyi M. Smith, 1932 - (BRADYBAENIDAE)
- mcgintyi, Anachis mcgintyi G.W. Nowell-Usticke, 1959 - syn of: Costoanachis hotessieriana (A.V.M.D. D'Orbigny, 1842) - (COLUMBELLIDAE)
- mcgintyi, Costoanachis mcgintyi G.W. Nowell-Usticke, 1959 - syn of: Costoanachis hotessieriana (A.V.M.D. D'Orbigny, 1842) - (COLUMBELLIDAE)
- mcgintyi, Conasprella mcgintyi (H.A. Pilsbry, 1955) - (CONIDAE)
- mcgintyi, Hemipolygona mcgintyi H.A. Pilsbry, 1939 - (FASCIOLARIIDAE)
- mcgintyi, Hyotissa mcgintyi (H.W. Harry, 1985) - (GRYPHAEIDAE)
- mcgintyi, Cyphoma mcgintyi H.A. Pilsbry, 1939 - (OVULIDAE)
- mcgintyi, Distorsio constricta mcgintyi W.K. Emerson & E.L. Puffer, 1953 - (PERSONIDAE)
- mcgintyi, Eubela mcgintyi J.S. Schwengel, 1943 - (RAPHITOMIDAE)
- mcgintyi, Leukoma metodon mcgintyi (A.A. Olsson, 1961) - (VENERIDAE)
- mcgintyi, Petaloconchus mcgintyi (A.A. Olsson & A. Harbison, 1953) - (VERMETIDAE)
- mcglameriae, Medionidus mcglameriae H. Van Der Schalie, 1939 - syn of: Leptodea fragilis C.S. Rafinesque, 1820 - (UNIONIDAE)
- mcglameryae, Hercoglossa mcglameryae Miller & Thompson, 1933 † - (HERCOGLOSSIDAE) (FOSSIL)
- mcgoniglensis, Anomia mcgoniglensis G.D. Hanna, 1927 † - (ANOMIIDAE) (FOSSIL)
- mcgowani, Diacavolinia mcgowani S. Van Der Spoel, P. Bleeker & H. Kobayasi, 1993 - (CAVOLINIIDAE)
- mcgrathi, Sauvagesia mcgrathi Chubb, 1956 † - syn of: Radiolites macroplicatus R.P. Whitfield, 1987 † - (RADIOLITIDAE) (FOSSIL)
- mcgrathiana, Callista mcgrathiana Rathburn, 1875 † - (VENERIDAE) (FOSSIL)
- mcgregori, Tornatellinops mcgregori (H.A. Pilsbry & C.M. Cooke, 1915) - (ACHATINELLIDAE)
- mcgregori, Leptachatina mcgregori H.A. Pilsbry & C.M. Cooke, 1914 - (AMASTRIDAE)
- mcgregori, Succinea mcgregori H.A. Pilsbry, 1898 - (SUCCINEIDAE)
- mcguirei, Turbonilla mcguirei A.M. Strong & L.G. Hertlein, 1939 - (PYRAMIDELLIDAE)
- mcilwraith, Umbilidelos mcilwraith J. Stanisic, 2010 - (RHYTIDIDAE)
- mckayi, Kalentera mckayi J. Marwick, 1953 † - (KALENTERIDAE) (FOSSIL)
- mckeei, Altudoceras mckeei J.P. Miller & Furnish, 1958 † - (PARAGASTRIOCERATIDAE) (FOSSIL)
- mckeei, Aulametacoceras mckeei Miller & Unklesbay, 1942 † - (TAINOCERATIDAE) (FOSSIL)
- mckelvei, Prohungarites mckelvei Kummel, 1969 † - (SIBIRITIDAE) (FOSSIL)
- mckenzicum, Onoceras mckenzicum Prouty, 1923 † - (ONCOCERATIDAE) (FOSSIL)
- mckenziei, Amplirhagada mckenziei F. Köhler, 2010 - (CAMAENIDAE)
- mckeowni, Velesunio mckeowni T. Iredale, 1943 - syn of: Velesunio ambiguus (R.A. Philippi, 1847) - (HYRIIDAE)
- mcleani, Retimohnia mcleani A. Kosyan & Y.I. Kantor, 2016 - (BUCCINIDAE)
- mcleani, Plicifusus mcleani B.I. Sirenko, 2009 - (BUCCINIDAE)
- mcleani, Calliostoma mcleani D.R. Shasky & G.B. Campbell, 1964 - (CALLIOSTOMATIDAE)
- mcleani, Bathybembix mcleani C. Nielsen & al., 2004 † - (CALLIOTROPIDAE) (FOSSIL)
- mcleani, Nemocataegis mcleani Hickman, 2017 - (CATAEGIDAE)
- mcleani, Strophiops mcleani W.J. Clench, 1952 - (CERIONIDAE)
- mcleani, Eatoniella mcleani (W.F. Ponder & H.W. Worsfold, 1994) - (EATONIELLIDAE)
- mcleani, Albosabula mcleani W.F. Ponder & H.W. Worsfold, 1994 - syn of: Eatoniella mcleani (W.F. Ponder & H.W. Worsfold, 1994) - (EATONIELLIDAE)
- mcleani, Acirsa mcleani B.I. Sirenko, 2009 - (EPITONIIDAE)
- mcleani, Fusinus mcleani Callomon & Snyder, 2017 - (FASCIOLARIIDAE)
- mcleani, Fissurella mcleani DeVries, 2008 † - (FISSURELLIDAE) (FOSSIL)
- mcleani, Muricopsis mcleani S.G. Wiedrick, 2009 - (MURICIDAE)
- mcleani, Americoliva mcleani E.J. Petuch & B.W. Myers, 2014 - (OLIVIDAE)
- mcleani, Ammonicera mcleani A.F. Sartori & R. Bieler, 2014 - (OMALOGYRIDAE)
- mcleani, Philine mcleani Valdés, Cadien & Gosliner, 2016 - (PHILINIDAE)
- mcleani, Macron mcleani G.J. Vermeij, 1998 - (PSEUDOLIVIDAE)
- mcleani, Trochomorpha mcleani W.J. Clench - (TROCHOMORPHIDAE)
- mcleani, Prisogaster mcleani DeVries, 2006 † - (TURBINIDAE) (FOSSIL)
- Mcleania, Genus Mcleania J.C. Bequaert & W.J. Clench, 1939 (THYSANOPHORIDAE)
- mclearni, Paracrochordiceras mclearni Bucher, 1989 † - (ACROCHORDICERATIDAE) (FOSSIL)
- mclearni, Ambonychiopsis mclearni Northrop, 1939 † - (AMBONYCHIIDAE) (FOSSIL)
- mclearni, Baculites mclearni H.D. Russell & Landes, 1937 † - (BACULITIDAE) (FOSSIL)
- mclearni, Grammysioidea mclearni Reed, 1927 † - (GRAMMYSIIDAE) (FOSSIL)
- mclearni, Panopea mclearni Warren, 1934 † - (HIATELLIDAE) (FOSSIL)
- mclearni, Meleagrinella mclearni McRoberts, 2011 † - (OXYTOMIDAE) (FOSSIL)
- mclearni, Pholadomya mclearni H.D. Russell & Landes, 1937 † - (PHOLADOMYIDAE) (FOSSIL)
- mclearni, Pterinea mclearni Northrop, 1939 † - (PTERINEIDAE) (FOSSIL)
- Mclearnia, Genus Mclearnia Crickmay, 1930 (PTERIIDA (UNASSIGNED)) (FOSSIL)
- mclellani, Pecten mclellani G.G. Gibson, 1987 † - (PECTINIDAE) (FOSSIL)
- mcleodensis, Grangerella mcleodensis H.D. Russell, 1931 † - (GRANGERELLIDAE) (FOSSIL)
- mcmichaeli, Meliobra mcmichaeli W.J. Clench & H. Turner, 1962 - (CAMAENIDAE)
- mcmichaeli, Aclophoropsis mcmichaeli (S. Kosuge, 1962) - (TRIPHORIDAE)
- mcmichaeli, Elliptio mcmichaeli W.J. Clench & H. Turner, 1956 - syn of: Elliptio macmichaeli W.J. Clench & H. Turner, 1956 - (UNIONIDAE)
- mcmichaeli, Volutoconus mcmichaeli T. Habe & S. Kosuge, 1966 - (VOLUTIDAE)
- mcmillanae, Chrysallida mcmillanae J.J. Van Aartsen, E. Gittenberger & J. Goud, 2000 - (PYRAMIDELLIDAE)
- mcmulleni, Stenothyra mcmulleni R.A.M. Brandt, 1970 - (STENOTHYRIDAE)
- mcmurdoensis, Struthiolarella mcmurdoensis J.D. Stilwell, 2000 † - (STRUTHIOLARIIDAE) (FOSSIL)
- mcmurrayi, Bullockus mcmurrayi (W.J. Clench & C.G. Aguayo, 1941) - (FASCIOLARIIDAE)
- mcmurrayi, Latirus mcmurrayi W.J. Clench & C.G. Aguayo, 1941 - syn of: Bullockus mcmurrayi (W.J. Clench & C.G. Aguayo, 1941) - (FASCIOLARIIDAE)
- mcnabianus, Aerotrochus mcnabianus (E. Chitty, 1853) - (SAGDIDAE)
- mcnairyensis, Arca mcnairyensis B. Wade, 1926 † - (ARCIDAE) (FOSSIL)
- mcnairyensis, Ostrea mcnairyensis B. Wade, 1926 † - (OSTREIDAE) (FOSSIL)
- mcneili, Ferrissia mcneili B. Walker, 1925 - (PLANORBIDAE)
- mcnielii, Anodon mcnielii J.G. Anthony, 1866 - syn of: Anodonta grandis T. Say, 1829 - (UNIONIDAE)
- mcoyi, Hypergonia mcoyi J. Donald, 1895 † - (ORTHONEMIDAE) (FOSSIL)
- mcoyi, Phanerotrema mcoyi Longst, 1924 † - syn of: Phanerotrema jugosum (Huxley & Etheridge, 1865 †) - (PHANEROTREMATIDAE) (FOSSIL)
- Mcqueenoceras, Genus Mcqueenoceras Ulrich & Foerste, 1936 (PROTEROCAMEROCERATIDAE) (FOSSIL)
- mctaggarti, Intornites mctaggarti (McLearn, 1946 †) - (LONGOBARDITIDAE) (FOSSIL)
- mea, Granaria mea É.A.A. Locard, 1894 - syn of: Granaria variabilis (J.P.R. Draparnaud, 1801) - (CHONDRINIDAE)
- mea, Zebrina mea L. Forcart, 1940 - syn of: Zebrina detrita (O.F. Müller, 1774) - (ENIDAE)
- Meadarion, Subgenus Ariolimax (Meadarion) H.A. Pilsbry, 1948 (ARIOLIMACIDAE)
- meadei, Helix meadei J.W. Brazier, 1871 - syn of: Xanthomelon spheroidea (E.J. Le Guillou, 1845) - (HELICIDAE)
- meadi, Bruggenina meadi (J.C. Bequaert, 1950) - (ACHATINIDAE)
- meadi, Sonorella meadi W.B. Miller, 1966 - (HELMINTHOGLYPTIDAE)
- meadowsi, Achatinella apexfulva meadowsi D.A. Welch, 1942 - (ACHATINELLIDAE)
- meafordensis, Modiolopsis meafordensis Foerste, 1924 † - (MODIOMORPHIDAE) (FOSSIL)
- meander, Chloritis meander (H.H. Godwin-Austen, 1891) - (CAMAENIDAE)
- Meandrella, Genus Meandrella Perner, 1903 (TUBINIDAE) (FOSSIL)
- meandrina, Phyllidiella meandrina (A. Pruvot-Fol, 1957) - (PHYLLIDIIDAE)
- meandrina, Phyllidia meandrina A. Pruvot-Fol, 1957 - syn of: Phyllidiella meandrina (A. Pruvot-Fol, 1957) - (PHYLLIDIIDAE)
- meandrina, Xenophora meandrina G. Fischer von Waldheim, 1807 - syn of: Xenophora conchyliophora (I. von Born, 1780) - (XENOPHORIDAE)
- meangensis, Grimpoteuthis meangensis (W.E. Hoyle, 1885) - (OPISTHOTEUTHIDAE)
- meanguerensis, Turbonilla meanguerensis L.G. Hertlein & A.M. Strong, 1951 - (PYRAMIDELLIDAE)
- meanii, Joculator meanii A. Cecalupo & I. Perugia, 2014 - (CERITHIOPSIDAE)
- mearni, Helicostyla mearni P. Bartsch, 1905 - syn of: Helicostyla mearnsi P. Bartsch, 1905 - (BRADYBAENIDAE)
- mearnsi, Helicostyla mearnsi P. Bartsch, 1905 - (BRADYBAENIDAE)
- mearnsi, Ryssota maxima mearnsi P. Bartsch, 1938 - (CHRONIDAE)
- mearnsi, Trigonia mearnsi Stoyanow, 1949 † - (TRIGONIIDAE) (FOSSIL)
- mearnsi, Toxolasma mearnsi C.T. Simpson, 1900 - (UNIONIDAE)
- mearnsi, Viviparus mearnsi (P. Bartsch, 1907) - (VIVIPARIDAE)
- mearnsii, Ashmunella mearnsii (W.H. Dall, 1895) - (POLYGYRIDAE)
- measuresae, Asgardaspira measuresae (Rohr, 1994 †) - (OPHILETIDAE) (FOSSIL)
- mechanica, Sinezona mechanica D.L. Geiger & B.A. Marshall, 2012 - (SCISSURELLIDAE)
- meckeli, Gastropteron meckeli Kosse, 1813 - syn of: Gastropteron rubrum (C.S. Rafinesque, 1814) - (GASTROPTERIDAE)
- meckeli, Pleurobranchaea meckeli (H.M.D. de Blainville, 1825) - (PLEUROBRANCHAEIDAE)
- meckeli, Pleurobranchaea meckeli H.M.D. de Blainville, 1825 - syn of: Pleurobranchaea meckeli (H.M.D. de Blainville, 1825) - (PLEUROBRANCHAEIDAE)
- meckelii, Doridium meckelii S. Delle Chiaje, 1824 - syn of: Aglaja tricolorata S.A. Renier, 1807 - (AGLAJIDAE)
- mecklenbergensis, Unio mecklenbergensis I. Lea, 1863 - syn of: Unio abbevillensis I. Lea, 1857 - (UNIONIDAE)
- Meckospira, syn of: Genus Meekospira Ulrich & Scofield, 1897 (MEEKOSPIRIDAE) (FOSSIL)
- Mecoliotia, syn of: Genus Sansonia F.P. Jousseaume, 1892 (PICKWORTHIIDAE)
- mecyna, Pseudanodonta mecyna J.R. Bourguignat, 1880 - syn of: Pseudanodonta middendorffi (Siemaschko, 1848) - (UNIONIDAE)
- Mecynoceras, Genus Mecynoceras Foerste, 1926 (POTERIOCERATIDAE) (FOSSIL)
- Mecynodon, Genus Mecynodon Keferstein, 1857 (MECYNODONTIDAE) (FOSSIL)
- MECYNODONTIDAE Haffer, 1959 - Family (BIVALVIA-HETERODONTA [Subclass]-EUHETERODONTA [Infraclass]-IMPARIDENTIA [Superorder]-MEGALODONTIDA [Order]-MECYNODONTOIDEA [Super) (FOSSIL)
- Mecyntera, Genus Mecyntera T. Iredale, 1941 (CAMAENIDAE)
- meda, Trochoidea meda (C. Porro, 1840) - (HYGROMIIDAE)
- medanensis, Runcina medanensis J.A. Ortea & L. Moro, 1999 - (RUNCINIDAE)
- medea, Coelostylina medea E.A.L. Kittl, 1894 † - (COELOSTYLINIDAE) (FOSSIL)
- Medea, syn of: Subgenus Ena (Caucasicola) P. Hesse, 1917 (ENIDAE)
- Medeela, Genus Medeela Milovanovic, 1956 (RADIOLITIDAE) (FOSSIL)
- Medeella, Genus Medeella Parona, 1924 (RADIOLITIDAE) (FOSSIL)
- medellina, Actinonaias medellina (I. Lea, 1838) - (UNIONIDAE)
- medeninensis, Neolobites medeninensis Basse, 1954 † - syn of: Neolobites fourteaui Pervinquière, 1907 † - (ENGONOCERATIDAE) (FOSSIL)
- Medfracaulus, Genus Medfracaulus Rohr & al. 2003 (PTYCHOCAULIDAE) (FOSSIL)
- medfraensis, Eleutherospira medfraensis Blodgett & Johnson, 1992 † - (EUOMPHALIDAE) (FOSSIL)
- medfraensis, Helicotoma medfraensis Rohr & Blodgett, 1988 † - syn of: Ceratopea medfraensis (Rohr & Blodgett, 1988 †) - (HELICOTOMIDAE) (FOSSIL)
- medfraensis, Alaskiella medfraensis Frýda & Blodgett, 1998 † - (PORCELLIIDAE) (FOSSIL)
- medfraensis, Ceratopea medfraensis (Rohr & Blodgett, 1988 †) - (RAPHISTOMATIDAE) (FOSSIL)
- Medfrazyga, Genus Medfrazyga Frύda & Blodgett, 2004 (PALAEOZYGOPLEURIDAE) (FOSSIL)
- media, Amastra textilis media A. Hyatt & H.A. Pilsbry, 1911 - (AMASTRIDAE)
- media, Aviculopecten media C.F. Laseron, 1910 † - (AVICULOPECTINIDAE) (FOSSIL)
- media, Bogoslovskya media P.A. Zhuravleva, 1978 † - (BOGOSLOVSKYIDAE) (FOSSIL)
- media, Bathytoma media (J. Marwick, 1931 †) - (BORSONIIDAE) (FOSSIL)
- media, Neptunea media P. Dautzenberg & H. Fischer, 1912 - syn of: Neptunea antiqua (C. Linnaeus, 1758) - (BUCCINIDAE)
- media, Bulla media L.S.R. Bergh in C.G. Semper, 1900 - syn of: Bulla striata J.G. Bruguière, 1792 - (BULLIDAE)
- media, Americardia media (C. Linnaeus, 1758) - (CARDIIDAE)
- media, Trigoniocardia media C. Linnaeus, 1758 - syn of: Americardia media (C. Linnaeus, 1758) - (CARDIIDAE)
- media, Strophiops media C.J. Maynard, 1896 - (CERIONIDAE)
- media, Hemiphaedusa media H. Nordsieck, 2005 - (CLAUSILIIDAE)
- media, Spissatella media J. Marwick, 1926 † - (CRASSATELLIDAE) (FOSSIL)
- media, Cuspidaria media A.E. Verrill & K.J. Bush, 1898 - (CUSPIDARIIDAE)
- media, Bernaya media (G.P. Deshayes, 1835 †) - (CYPRAEIDAE) (FOSSIL)
- media, Vanuxemia media Ulrich, 1894 † - (CYRTODONTIDAE) (FOSSIL)
- media, Puzosia media Seitz, 1931 † - (DESMOCERATIDAE) (FOSSIL)
- media, Toledonia media K.H.J. Thiele, 1912 - (DIAPHANIDAE)
- media, Donaldina media K. Bandel, 2002 † - (DONALDINIDAE) (FOSSIL)
- media, Pelseneeria media F. Koehler & C. Vaney, 1908 - (EULIMIDAE)
- media, Bathycrinicola media P. Bouchet & A. Warén, 1986 - (EULIMIDAE)
- media, Helix media C.B. Adams, 1851 - syn of: Pleurodonte catadupae H.B. Baker, 1935 - (HELICIDAE)
- media, Hemidonax media (C. Linnaeus, 1758) - (HEMIDONACIDAE)
- media, Holopea media Wilson, 1951 † - (HOLOPEIDAE) (FOSSIL)
- media, Hauffenia media J. Bole, 1961 - (HYDROBIIDAE)
- media, Alloteuthis media (C. Linnaeus, 1758) - (LOLIGINIDAE)
- media, Medlicottia media Ruzhentsev, 1949 † - (MEDLICOTTIIDAE) (FOSSIL)
- media, Melanopsis maroccana media P.M. Pallary, 1920 - (MELANOPSIDAE)
- media, Melanopsis maroccana media Blanckenhorn, 1897 - (MELANOPSIDAE)
- media, Mitra media A. Risso, 1826 - syn of: Mitra cornicula (C. Linnaeus, 1758) - (MITRIDAE)
- media, Aspella media R. Houart, 1987 - (MURICIDAE)
- media, Litschkovitrigonia media Saveliev, 1958 † - (MYOPHORELLIDAE) (FOSSIL)
- media, Clithon squarrosum media E.C. Von Martens, 1878 - (NERITIDAE)
- media, Trinacria media (G.P. Deshayes, 1858 †) - (NOETIIDAE) (FOSSIL)
- media, Leda media Lea, 1833 † - syn of: Calorhadia aequalis (T.A. Conrad, 1833 †) - (NUCULANIDAE) (FOSSIL)
- media, Nuculana media Lea, 1833 † - syn of: Calorhadia aequalis (T.A. Conrad, 1833 †) - (NUCULANIDAE) (FOSSIL)
- media, Agaronia media Meyer, 1885 † - (OLIVIDAE) (FOSSIL)
- media, Siliqua media Crosnier, 1987 - (PHARIDAE)
- media, Lissarca media K.H.J. Thiele, 1912 - (PHILOBRYIDAE)
- media, Eulimella media (F.W. Hutton, 1885 †) - (PYRAMIDELLIDAE) (FOSSIL)
- media, Phosinella media (G. Schwartz, 1860) - (RISSOINIDAE)
- media, Syndosmya media (G.P. Deshayes, 1857 †) - (SEMELIDAE) (FOSSIL)
- media, Sepia media C. Linnaeus, 1758 - syn of: Alloteuthis media (C. Linnaeus, 1758) - (SEPIIDAE)
- media, Struthiolaria media J. Marwick, 1924 - syn of: Pelicaria vermis (T. Martyn, 1784) - (STRUTHIOLARIIDAE)
- media, Pelicaria media J. Marwick, 1924 - syn of: Pelicaria vermis (T. Martyn, 1784) - (STRUTHIOLARIIDAE)
- media, Geomelania media C.B. Adams, 1850 - syn of: Geomelania gracilis C.B. Adams, 1850 - (TRUNCATELLIDAE)
- media, Anodonta media J.R. Bourguignat, 1885 - syn of: Anodonta cygnea (C. Linnaeus, 1758) - (UNIONIDAE)
- media, Policordia media T.A. Okutani, 1962 - syn of: Policordia pilula (J.P.L. Pelseneer, 1911) - (VERTICORDIIDAE)
- media, Madeirovitrina media (R.T. Lowe, 1854) - (VITRINIDAE)
- media awana, Phosinella media awana (M. Yokoyama, 1924 †) - (RISSOINIDAE) (FOSSIL)
- media meunieri, Bernaya media meunieri A.E.M. Cossmann, 1923 † - syn of: Lyncina amygdalina (G.P. Deshayes, 1835 †) - (CYPRAEIDAE) (FOSSIL)
- mediacostatus, Chlamys mediacostatus G.D. Hanna, 1926 † - (PECTINIDAE) (FOSSIL)
- mediafricana, Eupera mediafricana H.A. Pilsbry & J.C. Bequaert, 1927 - syn of: Eupera ferruginea (C.F.F. von Krauss, 1848) - (SPHAERIIDAE)
- mediafricana, Plicigulella vicina mediafricana H.A. Pilsbry, 1919 - (STREPTAXIDAE)
- mediafricana etheriarum, Eupera mediafricana etheriarum H.A. Pilsbry & J.C. Bequaert, 1927 - syn of: Eupera sturanyi (L. Waagen, 1905) - (SPHAERIIDAE)
- mediagibber, Dolichupis mediagibber D. Fehse & J. Grego, 2010 - (TRIVIIDAE)
- mediale, Cyclonema mediale Ulrich & Scofield, 1897 † - (PLATYCERATIDAE) (FOSSIL)
- medialira, Leptoconus medialira E.H. Vokes, 1938 † - (CONIDAE) (FOSSIL)
- medialis, Ctenodonta medialis Ulrich, 1894 † - (CTENODONTIDAE) (FOSSIL)
- medialis, Priscofusus medialis (T.A. Conrad, 1849 †) - (FASCIOLARIIDAE) (FOSSIL)
- medialis, Lophospira medialis Ulrich & Scofield, 1897 † - syn of: Lophospira milleri (Miller, 1877 †) - (LOPHOSPIRIDAE) (FOSSIL)
- medialis, Cumingia medialis T.A. Conrad, 1866 † - (SEMELIDAE) (FOSSIL)
- medialis, Ianthinopsis medialis (F.B. Meek & A.H. Worthen, 1860 †) - (SOLENISCIDAE) (FOSSIL)
- medialis, Fusispira nobilis medialis Wilson, 1951 † - (SUBULITIDAE) (FOSSIL)
- medialis, Arcopagia medialis T.A. Conrad, 1857 - syn of: Psammotreta obesa (G.P. Deshayes, 1855) - (TELLINIDAE)
- medialis, Episcynia medialis A.M. Keen, 1971 - (TORNIDAE)
- medialuna, Chrysallida medialuna M.J. Faber, 2008 - (PYRAMIDELLIDAE)
- mediamaricanus, Hybolophus mediamaricanus (J. Brown & H.A. Pilsbry, 1913 †) - (CRASSATELLIDAE) (FOSSIL)
- mediamericana, Cancellaria mediamericana E.J. Petuch, 1998 - (CANCELLARIIDAE)
- mediamericana, Eucrassatella mediamericana (J. Brown & H.A. Pilsbry, 1913 †) - (CRASSATELLIDAE) (FOSSIL)
- mediamericana, Semele mediamericana H.A. Pilsbry & H.N. Lowe, 1932 - syn of: Semele proficua (R. Pulteney, 1799) - (SEMELIDAE)
- mediamericana, Diplodonta mediamericana J. Brown & H.A. Pilsbry, 1913 † - (UNGULINIDAE) (FOSSIL)
- mediamericanum, Ptychopatula mediamericanum H.A. Pilsbry, 1920 - (VERTIGINIDAE)
- mediamericanus, Pustulatirus mediamericanus (L.G. Hertlein & A.M. Strong, 1951) - (FASCIOLARIIDAE)
- mediana, Bithynia mediana G.P. Deshayes, 1862 † - syn of: Stenothyra globulus mediana (G.P. Deshayes, 1862 †) - (BITHYNIIDAE) (FOSSIL)
- mediana, Sturanya mediana (Gassies, 1870) - (HELICINIDAE)
- mediana, Parayoldiella mediana (Z.A. Filatova & A.A. Schileyko, 1984) - (NUCULANIDAE)
- mediana, Stenothyra globulus mediana (G.P. Deshayes, 1862 †) - (STENOTHYRIDAE) (FOSSIL)
- mediana, Cochlodinella mediana (H.A. Pilsbry, 1913) - (UROCOPTIDAE)
- mediana, Portlandia mediana Z.A. Filatova & A.A. Schileyko, 1984 - syn of: Parayoldiella mediana (Z.A. Filatova & A.A. Schileyko, 1984) - (YOLDIIDAE)
- mediana, Yoldia mediana Gladikova, 1984 † - syn of: Yoldia praeposneri L. Krishtofovich, 1984 † - (YOLDIIDAE) (FOSSIL)
- medianum, Tomostoma medianum A.E.M. Cossmann & G. Pissarro, 1902 † - (NERITIDAE) (FOSSIL)
- mediapacifica, Hastula mediapacifica H.A. Pilsbry, 1921 - syn of: Hastula albula (K.T. Menke, 1843) - (TEREBRIDAE)
- mediapacifica melior, Hastula mediapacifica melior H.A. Pilsbry, 1921 - syn of: Hastula albula (K.T. Menke, 1843) - (TEREBRIDAE)
- mediaplata, Venericor mediaplata (Gardner & E. Bowles, 1939 †) - (CARDITIDAE) (FOSSIL)
- Mediappendix, syn of: Genus Catinella W.H. Pease, 1870 (SUCCINEIDAE)
- Mediargo, syn of: Genus Argobuccinum Herrmannsen, 1846 (RANELLIDAE)
- mediasiaticum, Placenticeras mediasiaticum Luppov, 1963 † - (PLACENTICERATIDAE) (FOSSIL)
- mediastinus, Unio mediastinus P.M. Heude, 1883 - syn of: Ptychorhynchus pfisteri (P.M. Heude, 1874) - (UNIONIDAE)
- Mediata, syn of: Genus Canopoconus Jiang, 1982 (MAIKHANELLIDAE) (FOSSIL)
- mediata, Berthellina mediata R.F. Burn, 1962 - syn of: Berthella medietas R.F. Burn, 1962 - (PLEUROBRANCHIDAE)
- mediator, Lyrogoniatites mediator Ruzhentsev & Bogoslovskaya, 1971 † - (NEOGLYPHIOCERATIDAE) (FOSSIL)
- mediavia, Eoancilla mediavia (G.F. Harris, 1896 †) - (ANCILLARIIDAE) (FOSSIL)
- mediavia, Ancilla mediavia G.F. Harris, 1896 † - syn of: Eoancilla mediavia (G.F. Harris, 1896 †) - (ANCILLARIIDAE) (FOSSIL)
- mediavia, Nucula mediavia G.F. Harris, 1896 † - (NUCULIDAE) (FOSSIL)
- mediavia, Olivella mediavia G.F. Harris, 1896 † - syn of: Eoancilla mediavia (G.F. Harris, 1896 †) - (OLIVELLIDAE) (FOSSIL)
- mediavia, Coronia mediavia (G.F. Harris, 1896 †) - (TURRIDAE) (FOSSIL)
- mediavia, Palmerella mortoni mediavia (E. Bowles, 1939 †) - (TURRITELLIDAE) (FOSSIL)
- mediaviense, Dentalium mediaviense G.F. Harris, 1896 † - (DENTALIIDAE) (FOSSIL)
- medicago, Murex medicago R.B. Watson, 1897 - syn of: Murexsul aradasii (T.A. de M. Monterosato in N.J. Poirier, 1883) - (MURICIDAE)
- medicata, Notovoluta verconis medicata T.A. Darragh, 1988 † - (VOLUTIDAE) (FOSSIL)
- medicinensis, Cancellaria medicinensis (Cragin, 1894 †) - (CANCELLARIIDAE) (FOSSIL)
- medicinensis, Petersia medicinensis Cragin, 1894 † - syn of: Cancellaria medicinensis (Cragin, 1894 †) - (EULIMIDAE) (FOSSIL)
- medidilatatus, Promathildia medidilatatus A.V. Guzhov, 2007 † - (GORDENELLIDAE) (FOSSIL)
- medietas, Berthella medietas R.F. Burn, 1962 - (PLEUROBRANCHIDAE)
- medilobatus, Lyrodus medilobatus (C.H. Edmondson, 1942) - (TEREDINIDAE)
- medinae, Cancellaria medinae R.A. Philippi, 1887 † - (CANCELLARIIDAE) (FOSSIL)
- medinae, Conus medinae R.A. Philippi, 1887 † - syn of: Austrombus medinae (R.A. Philippi, 1887 † †) - (CONIDAE) (FOSSIL)
- medinae, Leptochiton medinae (H.P. Plate, 1899) - (LEPTOCHITONIDAE)
- medinae, Melanopsis medinae T.A. Neubauer, O. Mandic, M. Harzhauser & Hrvatovic, 2013 † - syn of: Melanopsis carusi (Š. Brusina, 1902 †) - (MELANOPSIDAE) (FOSSIL)
- medinae, Nucella medinae (R.A. Philippi, 1887 †) - (MURICIDAE) (FOSSIL)
- medinae, Polinices medinae (R.A. Philippi, 1887 †) - (NATICIDAE) (FOSSIL)
- medinae, Propeleda medinae (R.A. Philippi, 1887 †) - (NUCULANIDAE) (FOSSIL)
- medinae, Austrombus medinae (R.A. Philippi, 1887 † †) - (STROMBIDAE) (FOSSIL)
- medinae, Triphora medinae J.J. Parodíz, 1955 - (TRIPHORIDAE)
- medinai, Adfacelina medinai S.V. Millen & A. Hermosillo, 2012 - (FACELINIDAE)
- medinanus, Drymaeus cantatus medinanus H.A. Pilsbry, 1935 - (BULIMULIDAE)
- medinensis, Megalacron phaeostoma medinensis B. Rensch, 1934 - (CAMAENIDAE)
- medioamericana, Anadara medioamericana A.A. Olsson, 1922 † - (ARCIDAE) (FOSSIL)
- medioamericana, Solenosteira vaughani medioamericana A.A. Olsson, 1922 - (BUCCINIDAE)
- medioamericana, Macoma medioamericana A.A. Olsson, 1942 - (TELLINIDAE)
- mediocardinalis, Cycloconcha mediocardinalis Miller, 1874 † - (CYCLOCONCHIDAE) (FOSSIL)
- mediocarinata, Bathytoma mediocarinata M. Yokoyama, 1920 - (BORSONIIDAE)
- mediocarinata, Megaentalina mediocarinata (M. Boissevain, 1906) - (ENTALINIDAE)
- mediocarinatum, Bothropoma mediocarinatum S. Reich & Wesselingh, 2014 † - (COLLONIIDAE) (FOSSIL)
- mediocincta, Volvarina mediocincta (E.A. Smith, 1875) - (MARGINELLIDAE)
- Medioclymenia, Genus Medioclymenia Korn 2002 (SPHENOCLYMENIIDAE) (FOSSIL)
- mediocostata, Haloceras mediocostata (P. Dautzenberg & H. Fischer, 1896) - (HALOCERATIDAE)
- mediocris, Bithynia mediocris Ludwig, 1865 † - (BITHYNIIDAE) (FOSSIL)
- mediocris, Chamalycaeus tokunoshimanus mediocris H.A. Pilsbry & Y. Hirase, 1904 - (CYCLOPHORIDAE)
- mediocris, Pustularia bistrinotata mediocris F.A. Schilder & M. Schilder, 1937 - (CYPRAEIDAE)
- mediocris, Corbicula mediocris T. Prime, 1862 - syn of: Corbicula striatella G.P. Deshayes, 1854 - (CYRENIDAE)
- mediocris, Tylotiella mediocris (G.P. Deshayes, 1863) - (DRILLIIDAE)
- mediocris, Hibernicoceras mediocris Moore & F. Hodson 1958 † - (GONIATITIDAE) (FOSSIL)
- mediocris, Holopea mediocris Billings, 1866 † - (HOLOPEIDAE) (FOSSIL)
- mediocris, Protetragonites mediocris Druschtschitz, 1956 † - syn of: Protetragonites crebrisulcatus (Uhlig, 1883 †) - (LYTOCERATIDAE) (FOSSIL)
- mediocris, Heterocithara mediocris N.H. Odhner, 1924 - (MANGELIIDAE)
- mediocris, Girtyspira mediocris (Delpey, 1942 †) - (MEEKOSPIRIDAE) (FOSSIL)
- mediocris, Septifer mediocris Devjatilova, 1981 † - (MYTILIDAE) (FOSSIL)
- mediocris, Phyllidia mediocris N. Yonow & B.W. Hayward, 1991 - syn of: Phyllidiella striata (L.S.R. Bergh, 1889) - (PHYLLIDIIDAE)
- mediocris, Fossarus mediocris L. de Folin, 1867 - (PLANAXIDAE)
- mediocris, Oonia mediocris Delpey, 1942 † - syn of: Girtyspira mediocris (Delpey, 1942 †) - (PSEUDOMELANIIDAE) (FOSSIL)
- mediocris, Turbonilla mediocris A. Peñas & E. Rolán, 1999 - (PYRAMIDELLIDAE)
- mediocris, Globozyga mediocris Jeffery & al., 1994 † - (STROBEIDAE) (FOSSIL)
- mediocris, Unio mediocris I. Lea, 1863 - syn of: Unio abbevillensis I. Lea, 1857 - (UNIONIDAE)
- mediofascata, Bela nebula mediofascata H. von Maltzan, 1883 - (MANGELIIDAE)
- medioflagellata, Lehmannia medioflagellata D. Lupu, 1968 - (LIMACIDAE)
- medioglabra, Euphaedusa cylindrella medioglabra (P.B. Schmacker & O. Böttger, 1894) - (CLAUSILIIDAE)
- mediolaeve, Cerithium mediolaeve H.F. Carpenter, 1857 - (CERITHIIDAE)
- mediolaevis, Bullia mediolaevis E.C. Von Martens, 1874 - syn of: Bullia diluta (C.F.F. von Krauss, 1848) - (NASSARIIDAE)
- mediolaevis, Haurakia mediolaevis B.C. Cotton, 1944 - (RISSOIDAE)
- mediolanensis, Oxyloma mediolanensis L. Pfeiffer, 1853 - syn of: Oxyloma elegans (A. Risso, 1826) - (SUCCINEIDAE)
- mediolevis, Colpospira mediolevis (J.C. Verco, 1910) - (TURRITELLIDAE)
- mediolevis, Turritella mediolevis J.C. Verco, 1910 - syn of: Colpospira mediolevis (J.C. Verco, 1910) - (TURRITELLIDAE)
- mediolittoralis, Alvania mediolittoralis S. Gofas, 1989 - (RISSOIDAE)
- mediolobatus, Lyrodus mediolobatus C.H. Edmondson, 1942 - syn of: Lyrodus medilobatus (C.H. Edmondson, 1942) - (TEREDINIDAE)
- mediolobum, Sulcogirtyoceras mediolobum Kullmann, 1962 † - (GIRTYOCERATIDAE) (FOSSIL)
- mediomaculata, Mitra mediomaculata G.B. III Sowerby, 1870 - syn of: Pusia mediomaculatum (G.B. III Sowerby, 1870) - (MITRIDAE)
- mediomaculatum, Pusia mediomaculatum (G.B. III Sowerby, 1870) - (COSTELLARIIDAE)
- Medionapus, Genus Medionapus Stephenson, 1941 (NEOGASTROPODA (UNASSIGNED)) (FOSSIL)
- Medionidus, Genus Medionidus C.T. Simpson, 1900 (UNIONIDAE)
- medionodosa, Eucycloscala medionodosa Batten, 1985 † - (EUCYCLOSCALIDAE) (FOSSIL)
- mediopacifica, Euciroa mediopacifica S. Kosuge, 1979 - syn of: Haliris mediopacifica (S. Kosuge, 1979) - (EUCIROIDAE)
- mediopacifica, Haliris mediopacifica (S. Kosuge, 1979) - (VERTICORDIIDAE)
- mediopacificensis, Dentalium mediopacificensis H.A. Rehder & H.S. Ladd, 1973 - (DENTALIIDAE)
- mediopacificus, Babelomurex mediopacificus (S. Kosuge, 1979) - (MURICIDAE)
- mediopacificus, Latiaxis mediopacificus S. Kosuge, 1979 - syn of: Babelomurex mediopacificus (S. Kosuge, 1979) - (MURICIDAE)
- mediopacificus, Polinices mediopacificus S. Kosuge, 1979 - (NATICIDAE)
- medioplicata, Scissurella medioplicata K.H.J. Thiele, 1925 - syn of: Scissurella petermannensis É. Lamy, 1910 - (SCISSURELLIDAE)
- Medioriopsis, Genus Medioriopsis A.E.M. Cossmann, 1888 (PLANAXIDAE) (FOSSIL)
- mediosulcata, Macluritella mediosulcata (Kobayashi, 1955 †) - (MACLURITIDAE) (FOSSIL)
- mediosulcata, Lytospira mediosulcata Kobayashi, 1955 † - syn of: Macluritella mediosulcata (Kobayashi, 1955 †) - (OPHILETIDAE) (FOSSIL)
- mediotincta, Mastonia mediotincta (R.P.J. Hervier, 1898) - (TRIPHORIDAE)
- mediotincta, Triphora mediotincta R.P.J. Hervier, 1898 - syn of: Mastonia mediotincta (R.P.J. Hervier, 1898) - (TRIPHORIDAE)
- mediotuberculatum, Prionocycloceras mediotuberculatum (U. Gerhardt, 1897 †) - (COLLIGNONICERATIDAE) (FOSSIL)
- medioximum, Trizonoceras medioximum Ruzhentsev & Bogoslovskaya, 1971 † - (DIMORPHOCERATIDAE) (FOSSIL)
- medioximus, Nitor medioximus T. Iredale, 1941 - (HELICARIONIDAE)
- medipacifica, Melanella medipacifica (H.A. Pilsbry, 1917) - (EULIMIDAE)
- medipacifica, Hastula medipacifica H.A. Pilsbry, 1921 - syn of: Hastula albula (K.T. Menke, 1843) - (TEREBRIDAE)
- medipictus, Pitar medipictus K.L. Lamprell & R.N. Kilburn, 1999 - (VENERIDAE)
- medipontea, Neotrigonia medipontea T.A. Darragh, 1986 † - (TRIGONIIDAE) (FOSSIL)
- Mediraon, Genus Mediraon Vokes, 1946 (CRASSATELLIDAE) (FOSSIL)
- Medistoma, syn of: Genus Canefriula T. Iredale, 1941 (CAMAENIDAE)
- mediterranea, Chelidonura mediterranea C.K. Swennen, 1961 - syn of: Chelidonura fulvipunctata K. Baba, 1938 - (AGLAJIDAE)
- mediterranea, Protatlanta mediterranea A. Issel, 1915 - (ATLANTIDAE)
- mediterranea, Parastrophia mediterranea (O.G. Costa, 1861) - (CAECIDAE)
- mediterranea, Caliphylla mediterranea (A. da Costa, 1867) - (CALIPHYLLIDAE)
- mediterranea, Carinaria mediterranea H.M.D. de Blainville, 1825 - syn of: Carinaria lamarcki F. Péron & C.A. Lesueur, 1810 - (CARINARIIDAE)
- mediterranea, Cerithium lividulum mediterranea G.P. Deshayes, 1843 - (CERITHIIDAE)
- mediterranea, Papillifera mediterranea W. Wood, 1828 - syn of: Papillifera bidens (C. Linnaeus, 1758) - (CLAUSILIIDAE)
- mediterranea, Clio mediterranea C. Gegenbaur, 1855 - syn of: Cliopsis krohnii F.H. Troschel, 1854 - (CLIIDAE)
- mediterranea, Dieneroceras mediterranea (Arthaber, 1908 †) - (COLUMBITIDAE) (FOSSIL)
- mediterranea, Naticopsis mediterranea C. Gemmellaro, 1889 † - (DELPHINULOPSIDAE) (FOSSIL)
- mediterranea, Allorisma mediterranea C. Gemmellaro, 1896 † - syn of: Wilkingia mediterranea (C. Gemmellaro, 1896 †) - (EDMONDIIDAE) (FOSSIL)
- mediterranea, Abralia mediterranea G.J. Pfeffer, 1912 - syn of: Abraliopsis morisii (J.B. Vérany, 1839) - (ENOPLOTEUTHIDAE)
- mediterranea, Epitonium mediterranea É.A.A. Locard & E. Caziot, 1901 - syn of: Epitonium clathrus (C. Linnaeus, 1758) - (EPITONIIDAE)
- mediterranea, Ersilia mediterranea (T.A. de M. Monterosato, 1869) - (EULIMIDAE)
- mediterranea, Triptychia mediterranea Käufel, 1928 † - (FILHOLIIDAE) (FOSSIL)
- mediterranea, Okenia mediterranea (H.F.A. von Ihering, 1886) - (GONIODORIDIDAE)
- mediterranea, Hanleya mediterranea B.I. Sirenko, 2014 - (HANLEYIDAE)
- mediterranea, Hero mediterranea (A. da Costa, 1866) - (HEROIDAE)
- mediterranea, Hyala mediterranea F. Nordsieck, 1972 - syn of: Hyala vitrea (G. Montagu, 1803) - (IRAVADIIDAE)
- mediterranea, Loligo mediterranea G. Targioni-Tozzetti, 1869 - syn of: Loligo vulgaris J.B.P.A. Lamarck, 1798 - (LOLIGINIDAE)
- mediterranea, Granulina mediterranea B.M. Landau, R. La Perna & R. Marquet, 2006 - (MARGINELLIDAE)
- mediterranea, Xenodiscus mediterranea Arthaber, 1908 † - syn of: Dieneroceras mediterranea (Arthaber, 1908 †) - (MEEKOCERATIDAE) (FOSSIL)
- mediterranea, Mitromorpha mediterranea C. Mifsud, 2001 - (MITROMORPHIDAE)
- mediterranea, Murchisonella mediterranea A. Peñas & E. Rolán, 2013 - (MURCHISONELLIDAE)
- mediterranea, Coralliophila mediterranea P. Parenzan, 1970 - syn of: Coralliophila monodonta (H.M.D. de Blainville, 1832) - (MURICIDAE)
- mediterranea, Liebea mediterranea C. Gemmellaro, 1896 † - (MYALINIDAE) (FOSSIL)
- mediterranea, Nassa mediterranea A. Risso, 1826 † - syn of: Tritia mutabilis (C. Linnaeus, 1758 †) - (NASSARIIDAE) (FOSSIL)
- mediterranea, Septaria mediterranea A. Risso, 1826 - syn of: Nototeredo norvagica (L. Spengler, 1792) - (NERITIDAE)
- Mediterranea, Subgenus Oxychilus (Mediterranea) S. Clessin, 1880 (OXYCHILIDAE)
- mediterranea, Boopsis mediterranea U. Pierantoni, 1923 - syn of: Cephalopyge trematoides (C. Chun, 1889) - (PHYLLIROIDAE)
- mediterranea, Tambja mediterranea M. Domínguez, M. Pola & M. Ramón, 2015 - (POLYCERIDAE)
- mediterranea, Polycera mediterranea L.S.R. Bergh, 1880 - syn of: Polycera quadrilineata (O.F. Müller, 1776) - (POLYCERIDAE)
- mediterranea, Pronorites mediterranea Renz & Renz, 1948 † - (PRONORITIDAE) (FOSSIL)
- mediterranea, Pyroteuthis mediterranea G.J. Pfeffer, 1912 - syn of: Pyroteuthis margaritifera (W.P.E.S. Rüppell, 1844) - (PYROTEUTHIDAE)
- mediterranea, Alvania mediterranea A. Risso, 1826 - syn of: Alvania discors (T. Allan, 1818) - (RISSOIDAE)
- mediterranea, Manzonia crassa mediterranea F. Nordsieck, 1972 - (RISSOIDAE)
- mediterranea, Wilkingia mediterranea (C. Gemmellaro, 1896 †) - (SANGUINOLITIDAE) (FOSSIL)
- mediterranea, Sepia mediterranea A.P. Ninni, 1885 - syn of: Sepia officinalis C. Linnaeus, 1758 - (SEPIIDAE)
- mediterranea, Solenomya mediterranea J.B.P.A. Lamarck, 1818 - syn of: Solemya togata (G.S. Poli, 1791) - (SOLEMYIDAE)
- mediterranea, Tellina mediterranea A. da Costa, 1830 - syn of: Lentidium mediterraneum (A. da Costa, 1830) - (TELLINIDAE)
- mediterranea, Nototeredo mediterranea A. Risso, 1826 - syn of: Nototeredo norvagica (L. Spengler, 1792) - (TEREDINIDAE)
- mediterranea, Tenellia mediterranea A. da Costa, 1866, 1863 - syn of: Tenellia adspersa (A. Nordmann, 1845) - (TRINCHESIIDAE)
- mediterranea, Trivia mediterranea (A. Risso, 1826) - (TRIVIIDAE)
- mediterranea, Gibbula mediterranea A. Risso, 1826 - syn of: Gibbula umbilicaris (C. Linnaeus, 1758) - (TROCHIDAE)
- mediterranea, Turritella mediterranea T.A. de M. Monterosato, 1890 - syn of: Turritella turbona T.A. de M. Monterosato, 1877 - (TURRITELLIDAE)
- mediterranea, Venus mediterranea N. Tiberi, 1855 - syn of: Pitar mediterraneus (A. Aradas & L. Benoit, 1872) - (VENERIDAE)
- mediterranea, Meretrix mediterranea P. Dautzenberg, 1891 - syn of: Pitar mediterraneus (A. Aradas & L. Benoit, 1872) - (VENERIDAE)
- mediterranea, Xenophora mediterranea N. Tiberi, 1863 - syn of: Xenophora crispa C.D.E. König, 1825 - (XENOPHORIDAE)
- mediterranea adriatica, Trivia mediterranea adriatica G.S. Coen, 1937 - syn of: Trivia multilirata (G.B. II Sowerby, 1870) - (TRIVIIDAE)
- mediterranea elongata, Epitonium mediterranea elongata É.A.A. Locard & E. Caziot, 1901 - syn of: Epitonium clathrus (C. Linnaeus, 1758) - (EPITONIIDAE)
- mediterranea major, Epitonium mediterranea major É.A.A. Locard & E. Caziot, 1901 - syn of: Epitonium clathrus (C. Linnaeus, 1758) - (EPITONIIDAE)
- mediterranea minor, Epitonium mediterranea minor É.A.A. Locard & E. Caziot, 1901 - syn of: Epitonium clathrus (C. Linnaeus, 1758) - (EPITONIIDAE)
- mediterranea oceanica, Carinaria mediterranea oceanica A.J.B.M. Vayssière, 1904 - syn of: Carinaria lamarcki F. Péron & C.A. Lesueur, 1810 - (CARINARIIDAE)
- mediterranea pellucens, Trivia mediterranea pellucens G.S. Coen & A. Vatova, 1933 - syn of: Trivia multilirata (G.B. II Sowerby, 1870) - (TRIVIIDAE)
- Mediterraneotrigonia, Genus Mediterraneotrigonia Nakano, 1974 (TRIGONIIDA (UNASSIGNED)) (FOSSIL)
- mediterraneum, Agathiceras mediterraneum Toumanskaya, 1949 † - (AGATHICERATIDAE) (FOSSIL)
- mediterraneum, Basisulcata mediterraneum T.A. de M. Monterosato, 1872 - syn of: Basisulcata lepida (F.M. Bayer, 1942) - (ARCHITECTONICIDAE)
- mediterraneum, Buccinum mediterraneum A. Risso, 1826 - syn of: Charonia lampas (C. Linnaeus, 1758) - (BUCCINIDAE)
- mediterraneum, Cerithium mediterraneum G.P. Deshayes, 1843 - syn of: Cerithium lividulum A. Risso, 1826 - (CERITHIIDAE)
- mediterraneum, Lentidium mediterraneum (A. da Costa, 1830) - (CORBULIDAE)
- mediterraneum, Harpoceras mediterraneum Pinna, 1968 † - (HILDOCERATIDAE) (FOSSIL)
- mediterraneum, Stacheoceras mediterraneum C. Gemmellaro, 1887 † - (NEOSTACHEOCERATIDAE) (FOSSIL)
- mediterraneum, Holcophylloceras mediterraneum (M. von Neumayr, 1871 †) - (PHYLLOCERATIDAE) (FOSSIL)
- mediterraneum, Pneumoderma mediterraneum P.J. Van Beneden, 1838 - (PNEUMODERMATIDAE)
- mediterraneum, Tropidoceras mediterraneum C. Gemmellaro, 1884 † - (POLYMORPHITIDAE) (FOSSIL)
- mediterraneum, Charonia mediterraneum A. Risso, 1826 - syn of: Charonia lampas (C. Linnaeus, 1758) - (RANELLIDAE)
- mediterraneum, Charonia mediterraneum G.B. II Sowerby, 1833 - syn of: Cumia reticulata (H.M.D. de Blainville, 1829) - (RANELLIDAE)
- mediterraneum, Triton mediterraneum G.B. II Sowerby, 1833 - syn of: Cumia reticulata (H.M.D. de Blainville, 1829) - (RANELLIDAE)
- mediterraneum, Thalassoceras mediterraneum Toumanskaya, 1949 † - (THALASSOCERATIDAE) (FOSSIL)
- mediterraneum, Umbraculum mediterraneum J.B.P.A. Lamarck, 1819 - syn of: Umbraculum umbraculum (J. Lightfoot, 1786) - (UMBRACULIDAE)
- mediterraneum, Umbraculum mediterraneum P.F. Röding, 1798 - syn of: Umbraculum umbraculum (J. Lightfoot, 1786) - (UMBRACULIDAE)
- mediterraneum, Pitar rudis mediterraneum N. Tiberi, 1885 - (VENERIDAE)
- mediterraneum archipelagica, Cerithium mediterraneum archipelagica P.M. Pallary, 1912 - syn of: Cerithium lividulum A. Risso, 1826 - (CERITHIIDAE)
- mediterraneum syriaca, Cerithium mediterraneum syriaca P.M. Pallary, 1919 - syn of: Cerithium lividulum A. Risso, 1826 - (CERITHIIDAE)
- mediterraneum trigonulum, Lentidium mediterraneum trigonulum T.A. de M. Monterosato, 1884 - (CORBULIDAE)
- mediterraneus, Chiton mediterraneus L.A. Reeve, 1847 - syn of: Ischnochiton rissoi Angelo & C. Smriglio, 1999 - (CHITONIDAE)
- mediterraneus, Conus mediterraneus M.E.J. Bucquoy, P. Dautzenberg & G.F. Dollfus - syn of: Lautoconus ventricosus (J.F. Gmelin, 1791) - (CONIDAE)
- mediterraneus, Conus mediterraneus E. Réquien, 1848 - syn of: Lautoconus ventricosus (J.F. Gmelin, 1791) - (CONIDAE)
- mediterraneus, Conus mediterraneus W. Kobelt, 1906 - syn of: Lautoconus ventricosus (J.F. Gmelin, 1791) - (CONIDAE)
- mediterraneus, Conus mediterraneus P.M. Pallary, 1912 - syn of: Lautoconus ventricosus (J.F. Gmelin, 1791) - (CONIDAE)
- mediterraneus, Conus mediterraneus C.H. Hwass in J.G. Bruguière, 1792 - syn of: Lautoconus ventricosus (J.F. Gmelin, 1791) - (CONIDAE)
- mediterraneus, Conus mediterraneus R.A. Philippi, 1836 - syn of: Lautoconus ventricosus (J.F. Gmelin, 1791) - (CONIDAE)
- mediterraneus, Conus mediterraneus G.S. Coen, 1933 - syn of: Lautoconus ventricosus (J.F. Gmelin, 1791) - (CONIDAE)
- mediterraneus, Conus mediterraneus A. De Gregorio, 1885 - syn of: Lautoconus ventricosus (J.F. Gmelin, 1791) - (CONIDAE)
- mediterraneus, Lautoconus mediterraneus C.H. Hwass in J.G. Bruguière, 1792 - syn of: Lautoconus ventricosus (J.F. Gmelin, 1791) - (CONIDAE)
- mediterraneus, Conus mediterraneus K. Nicolay, 1978 - syn of: Lautoconus ventricosus (J.F. Gmelin, 1791) - (CONIDAE)
- mediterraneus, Conus mediterraneus T.A. de M. Monterosato, 1917 - syn of: Lautoconus ventricosus (J.F. Gmelin, 1791) - (CONIDAE)
- mediterraneus, Nodicoeloceras mediterraneus (Renz 1912 †) - (DACTYLIOCERATIDAE) (FOSSIL)
- mediterraneus, Goniatites mediterraneus Kullmann, 1961 † - (GONIATITIDAE) (FOSSIL)
- mediterraneus, Ischnochiton mediterraneus L.A. Reeve, 1847 - syn of: Ischnochiton rissoi Angelo & C. Smriglio, 1999 - (ISCHNOCHITONIDAE)
- mediterraneus, Arnautoceltites mediterraneus (Arthaber, 1911 †) - (MELAGATHICERATIDAE) (FOSSIL)
- mediterraneus, Nassarius mediterraneus K.O. Milaschewitsch, 1909 - syn of: Tritia reticulata (C. Linnaeus, 1758) - (NASSARIIDAE)
- mediterraneus, Spondylus mediterraneus J. Hermann, 1781 - syn of: Spondylus gaederopus C. Linnaeus, 1758 - (SPONDYLIDAE)
- mediterraneus, Strombus mediterraneus P.L. Duclos, 1844 - syn of: Persististrombus latus (J.F. Gmelin, 1791) - (STROMBIDAE)
- mediterraneus, Clanculopsis mediterraneus W. Wood - syn of: Clanculus cruciatus (C. Linnaeus, 1758) - (TROCHIDAE)
- mediterraneus, Pitar mediterraneus (A. Aradas & L. Benoit, 1872) - (VENERIDAE)
- mediterraneus acuta, Conus mediterraneus acuta E. Réquien, 1848 - syn of: Lautoconus ventricosus (J.F. Gmelin, 1791) - (CONIDAE)
- mediterraneus alalmus, Conus mediterraneus alalmus A. De Gregorio, 1885 - syn of: Lautoconus ventricosus (J.F. Gmelin, 1791) - (CONIDAE)
- mediterraneus alba, Conus mediterraneus alba G.S. Coen, 1933 - syn of: Lautoconus ventricosus (J.F. Gmelin, 1791) - (CONIDAE)
- mediterraneus albina, Conus mediterraneus albina M.E.J. Bucquoy, P. Dautzenberg & G.F. Dollfus, 1882 - syn of: Lautoconus ventricosus (J.F. Gmelin, 1791) - (CONIDAE)
- mediterraneus alticonica, Conus mediterraneus alticonica P.M. Pallary, 1904 - syn of: Lautoconus ventricosus (J.F. Gmelin, 1791) - (CONIDAE)
- mediterraneus amigus, Conus mediterraneus amigus A. De Gregorio, 1885 - syn of: Lautoconus ventricosus (J.F. Gmelin, 1791) - (CONIDAE)
- mediterraneus arenaria, Conus mediterraneus arenaria T.A. de M. Monterosato, 1917 - syn of: Lautoconus ventricosus (J.F. Gmelin, 1791) - (CONIDAE)
- mediterraneus ater, Conus mediterraneus ater R.A. Philippi, 1836 - syn of: Lautoconus ventricosus (J.F. Gmelin, 1791) - (CONIDAE)
- mediterraneus atra, Conus mediterraneus atra R.A. Philippi, 1844 - syn of: Lautoconus ventricosus (J.F. Gmelin, 1791) - (CONIDAE)
- mediterraneus caerulescens, Conus mediterraneus caerulescens M.E.J. Bucquoy, P. Dautzenberg & G.F. Dollfus, 1883 - syn of: Lautoconus ventricosus (J.F. Gmelin, 1791) - (CONIDAE)
- mediterraneus carinata, Conus mediterraneus carinata M.E.J. Bucquoy, P. Dautzenberg & G.F. Dollfus, 1884 - syn of: Lautoconus ventricosus (J.F. Gmelin, 1791) - (CONIDAE)
- mediterraneus castanea, Conus mediterraneus castanea G.S. Coen, 1933 - syn of: Lautoconus ventricosus (J.F. Gmelin, 1791) - (CONIDAE)
- mediterraneus debilis, Conus mediterraneus debilis T.A. de M. Monterosato, 1917 - syn of: Lautoconus ventricosus (J.F. Gmelin, 1791) - (CONIDAE)
- mediterraneus desidiosus, Leptoconus mediterraneus desidiosus A. Adams, 1853 - syn of: Lautoconus desidiosus (A. Adams, 1853) - (CONIDAE)
- mediterraneus elongata, Conus mediterraneus elongata M.E.J. Bucquoy, P. Dautzenberg & G.F. Dollfus, 1885 - syn of: Lautoconus ventricosus (J.F. Gmelin, 1791) - (CONIDAE)
- mediterraneus emisus, Conus mediterraneus emisus A. De Gregorio, 1885 - syn of: Lautoconus ventricosus (J.F. Gmelin, 1791) - (CONIDAE)
- mediterraneus fasciata, Conus mediterraneus fasciata E. Réquien, 1848 - syn of: Lautoconus ventricosus (J.F. Gmelin, 1791) - (CONIDAE)
- mediterraneus flammulata, Conus mediterraneus flammulata M.E.J. Bucquoy, P. Dautzenberg & G.F. Dollfus, 1882 - syn of: Lautoconus ventricosus (J.F. Gmelin, 1791) - (CONIDAE)
- mediterraneus flavescens, Conus mediterraneus flavescens G.S. Coen, 1933 - syn of: Lautoconus ventricosus (J.F. Gmelin, 1791) - (CONIDAE)
- mediterraneus fusca, Conus mediterraneus fusca M.E.J. Bucquoy, P. Dautzenberg & G.F. Dollfus, 1882 - syn of: Lautoconus ventricosus (J.F. Gmelin, 1791) - (CONIDAE)
- mediterraneus gaudiosus, Conus mediterraneus gaudiosus K. Nicolay, 1978 - syn of: Lautoconus ventricosus (J.F. Gmelin, 1791) - (CONIDAE)
- mediterraneus interrupta, Conus mediterraneus interrupta G.S. Coen, 1933 - syn of: Lautoconus ventricosus (J.F. Gmelin, 1791) - (CONIDAE)
- mediterraneus lutea, Conus mediterraneus lutea M.E.J. Bucquoy, P. Dautzenberg & G.F. Dollfus, 1882 - syn of: Lautoconus ventricosus (J.F. Gmelin, 1791) - (CONIDAE)
- mediterraneus major, Conus mediterraneus major M.E.J. Bucquoy, P. Dautzenberg & G.F. Dollfus, 1882 - syn of: Lautoconus ventricosus (J.F. Gmelin, 1791) - (CONIDAE)
- mediterraneus marmoratus, Conus mediterraneus marmoratus R.A. Philippi, 1836 - syn of: Lautoconus ventricosus (J.F. Gmelin, 1791) - (CONIDAE)
- mediterraneus minor, Conus mediterraneus minor T.A. de M. Monterosato, 1878 - syn of: Lautoconus ventricosus (J.F. Gmelin, 1791) - (CONIDAE)
- mediterraneus noeformis, Lautoconus mediterraneus noeformis T.A. de M. Monterosato, 1923 - syn of: Lautoconus ventricosus (J.F. Gmelin, 1791) - (CONIDAE)
- mediterraneus oblonga, Conus mediterraneus oblonga M.E.J. Bucquoy, P. Dautzenberg & G.F. Dollfus, 1882 - syn of: Lautoconus ventricosus (J.F. Gmelin, 1791) - (CONIDAE)
- mediterraneus obtusa, Conus mediterraneus obtusa E. Réquien, 1848 - syn of: Lautoconus ventricosus (J.F. Gmelin, 1791) - (CONIDAE)
- mediterraneus pallida, Conus mediterraneus pallida M.E.J. Bucquoy, P. Dautzenberg & G.F. Dollfus, 1882 - syn of: Lautoconus ventricosus (J.F. Gmelin, 1791) - (CONIDAE)
- mediterraneus persistens, Conus mediterraneus persistens W. Kobelt, 1906 - syn of: Lautoconus ventricosus (J.F. Gmelin, 1791) - (CONIDAE)
- mediterraneus pretunculus, Conus mediterraneus pretunculus T.A. de M. Monterosato, 1917 - syn of: Lautoconus ventricosus (J.F. Gmelin, 1791) - (CONIDAE)
- mediterraneus rubens, Conus mediterraneus rubens M.E.J. Bucquoy, P. Dautzenberg & G.F. Dollfus, 1882 - syn of: Lautoconus ventricosus (J.F. Gmelin, 1791) - (CONIDAE)
- mediterraneus rufatra, Conus mediterraneus rufatra A. De Gregorio, 1885 - syn of: Lautoconus ventricosus (J.F. Gmelin, 1791) - (CONIDAE)
- mediterraneus scalare, Conus mediterraneus scalare P. Dautzenberg, 1911 - syn of: Lautoconus ventricosus (J.F. Gmelin, 1791) - (CONIDAE)
- mediterraneus scalaris, Conus mediterraneus scalaris P.M. Pallary, 1912 - syn of: Lautoconus ventricosus (J.F. Gmelin, 1791) - (CONIDAE)
- mediterraneus subconcolor, Conus mediterraneus subconcolor E. Réquien, 1848 - syn of: Lautoconus ventricosus (J.F. Gmelin, 1791) - (CONIDAE)
- mediterraneus subviridis, Conus mediterraneus subviridis A. De Gregorio, 1885 - syn of: Lautoconus ventricosus (J.F. Gmelin, 1791) - (CONIDAE)
- mediterraneus vayssierei, Conus mediterraneus vayssierei P.M. Pallary, 1906 - syn of: Lautoconus vayssierei (P.M. Pallary, 1906) - (CONIDAE)
- mediterranica, Rimella mediterranica Abbass, 1967 † - (RIMELLIDAE) (FOSSIL)
- meditjensis, Planorbarius meditjensis E. Forbes, 1839 - syn of: Planorbarius dufourii (M.de la Paz Graells, 1846) - (PLANORBIDAE)
- medium, Buccinulum medium F.W. Hutton, 1885 † - (BUCCINIDAE) (FOSSIL)
- medium, Ophiceras medium (Griesbach, 1880 †) - (DIENEROCERATIDAE) (FOSSIL)
- medium, Epitonium medium P.F. Röding, 1798 - syn of: Epitonium scalare (C. Linnaeus, 1758) - (EPITONIIDAE)
- medium, Radix medium S.E. Studer in W. Coxe, 1789 - syn of: Radix balthica (C. Linnaeus, 1758) - (LYMNAEIDAE)
- medium, Neumatoceras medium Flower, 1952 † - (ONCOCERATIDAE) (FOSSIL)
- medium, Lytophiceras medium Spath 1930 † - (OPHICERATIDAE) (FOSSIL)
- medium, Amphipopanoceras medium McLearn, 1948 † - (PARAPOPANOCERATIDAE) (FOSSIL)
- medius, Stenothecoides medius Koneva, 1979 † - (CAMBRIDIIDAE) (FOSSIL)
- medius, Knightites medius E.L. Yochelson, 1960 † - (KNIGHTITIDAE) (FOSSIL)
- medius, Nannites medius Krafft & Diener, 1909 † - (NANNITIDAE) (FOSSIL)
- medius, Pecten medius J.B.P.A. Lamarck, 1819 - syn of: Pecten maxima (C. Linnaeus, 1758) - (PECTINIDAE)
- medius, Metaperrinites medius Leonova 1983 † - (PERRINITIDAE) (FOSSIL)
- medius, Plicatula medius J.B.P.A. Lamarck, 1819 - syn of: Pecten fumatus L.A. Reeve, 1852 - (PLICATULIDAE)
- medius, Postprolobites medius Wedekind, 1913 † - syn of: Prionoceras divisum (G.G. Münster, 1832 †) - (PRIONOCERATIDAE) (FOSSIL)
- medius, Pyrunculus medius (W.H. Dall, 1927) - (RETUSIDAE)
- medius, Solen medius G.B. I Sowerby, 1839 - syn of: Siliqua alta (W.J. Broderip & G.B. I Sowerby, 1829) - (SOLENIDAE)
- medius, Circuitus medius Rubio & Rolán, 2017 - (TORNIDAE)
- medius, Unio medius I. Lea, 1861 - syn of: Pleurobema georgianum I. Lea, 1841 - (UNIONIDAE)
- medjensis, Zonitotrochus medjensis H.A. Pilsbry, 1919 - (UROCYCLIDAE)
- medjeorum, Potadoma medjeorum H.A. Pilsbry & J.C. Bequaert, 1927 - (PACHYCHILIDAE)
- Medlicottia, Genus Medlicottia Waagen , 1880 (MEDLICOTTIIDAE) (FOSSIL)
- medlicottianum, Gyroceras medlicottianum L. Waagen, 1879 † - syn of: Metacoceras medlicottianum (L. Waagen, 1879 †) - (ONCOCERIDA (unassigned)) (FOSSIL)
- medlicottianum, Pisidium medlicottianum Hislop, 1859 † - (SPHAERIIDAE) (FOSSIL)
- medlicottianum, Metacoceras medlicottianum (L. Waagen, 1879 †) - (TAINOCERATIDAE) (FOSSIL)
- MEDLICOTTIIDAE Karpinsky, 1889 - Family (CEPHALOPODA-AMMONOIDEA [Subclass]-PROLECANITIDA [Order]-MEDLICOTTIOIDEA [Superfamily]) (FOSSIL)
- medlycotti, Cristataria strangulata medlycotti (H.B. Tristram, 1865) - (CLAUSILIIDAE)
- medoacense, Cingulifera cingulatum medoacense (G.B. Adami, 1886) - (HELICIDAE)
- medoci, Dendroconus medoci F.Jr. Lorenz, 2004 - (CONIDAE)
- medoci armeniaca, Dendroconus medoci armeniaca (L. Bozzetti, 2009) - (CONIDAE)
- medoevi, Kazakhoclymenia medoevi Bogoslovsky, 1979 † - (CLYMENIIDA (UNASSIGNED)) (FOSSIL)
- medolense, Reynesoceras medolense (J. Von Hauer 1861 †) - (DACTYLIOCERATIDAE) (FOSSIL)
- Medora, Genus Medora H. Adams & A. Adams, 1855 (CLAUSILIIDAE)
- Medorella, syn of: Genus Medora H. Adams & A. Adams, 1855 (CLAUSILIIDAE)
- medorella, Herilla illyrica medorella H. Nordsieck, 1971 - (CLAUSILIIDAE)
- Medoria, syn of: Genus Lacuna W.H. Turton, 1827 (LITTORINIDAE)
- medoria, Octopus medoria J.E. Gray, 1849 - (OCTOPODIDAE)
- Medoriopsis, Genus Medoriopsis Cossmann, 1888 (PLANAXIDAE) (FOSSIL)
- medoroides, Herilla illyrica medoroides (A.J. Wagner, 1915) - (CLAUSILIIDAE)
- medoroides, Sprattia beycola medoroides H. Nordsieck, 2004 - (CLAUSILIIDAE)
- medrickyi, Cerithium lividulum medrickyi F. Nordsieck, 1975 - (CERITHIIDAE)
- medusa, Eumorphoceras medusa L.G. Yates, 1961 † - (GIRTYOCERATIDAE) (FOSSIL)
- medusa, Patella medusa P.F. Röding, 1798 - syn of: Patella ferruginea J.F. Gmelin, 1791 - (PATELLIDAE)
- medusae, Cucullus medusae P.F. Röding, 1798 - syn of: Dendroconus betulinus (C. Linnaeus, 1758) - (CONIDAE)
- medusae, Thylacodes medusae H.A. Pilsbry, 1891 - (VERMETIDAE)
- Medusafissurella, Genus Medusafissurella J.H. McLean & R.N. Kilburn, 1986 (FISSURELLIDAE)
- medusoides, Opisthoteuthis medusoides K.H.J. Thiele, 1915 - (OPISTHOTEUTHIDAE)
- medvedevi, Varioconus medvedevi A. Monteiro, C.M.L. Afonso & al., 2014 - (CONIDAE)
- medvezhense, Teneroceras medvezhense Yatskov, 1990 † - (MIMOSPHINCTIDAE) (FOSSIL)
- Medyla, syn of: Genus Vitrinula J.E. Gray in P.P. Carpenter, 1856 (ARIOPHANTIDAE)
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