- membielinus, Drymaeus membielinus J.C.H. Crosse, 1867 - (BULIMULIDAE)
- membranacea, Heteranomia membranacea J.B.P.A. Lamarck, 1819 - syn of: Heteranomia squamula (C. Linnaeus, 1758) - (ANOMIIDAE)
- membranacea, Satiella membranacea (W.H. Benson, 1853) - (ARIOPHANTIDAE)
- membranacea, Laeviemarginula membranacea T. Habe, 1953 - syn of: Laeviemarginula kimberi (B.C. Cotton, 1930) - (FISSURELLIDAE)
- membranacea, Leptaxis membranacea R.T. Lowe, 1852 - (HYGROMIIDAE)
- membranacea, Zenobiella membranacea T. Brown, 1827 - syn of: Zenobiella subrufescens (J.S. Miller, 1822) - (HYGROMIIDAE)
- membranacea, Laona membranacea T.A. de M. Monterosato, 1880 - syn of: Laona pruinosa (W. Clark, 1827) - (LAONIDAE)
- membranacea, Radix membranacea C. Porro, 1838 - syn of: Radix labiata (E.A. Rossmässler, 1835) - (LYMNAEIDAE)
- membranacea, Mya membranacea W.G. Maton, 1811 - syn of: Rhipidodonta variabilis (W.G. Maton, 1811) - (MYIDAE)
- membranacea, Philine membranacea T.A. de M. Monterosato, 1880 - syn of: Laona pruinosa (W. Clark, 1827) - (PHILINIDAE)
- membranacea, Posidonia membranacea (F. McCoy, 1844 †) - (POSIDONIIDAE) (FOSSIL)
- membranacea, Xanthodaphne membranacea (R.B. Watson, 1886) - (RAPHITOMIDAE)
- membranacea, Rissoa membranacea (J. Adams, 1800) - (RISSOIDAE)
- membranacea, Fluxinella membranacea B.A. Marshall, 1991 - (SEGUENZIIDAE)
- membranacea, Simpulopsis membranacea A. Villa, 1841 - (SIMPULOPSIDAE)
- membranacea, Unio membranacea S.C.T. Hanley, 1843 - syn of: Rhipidodonta variabilis (W.G. Maton, 1811) - (UNIONIDAE)
- membranacea, Anodonta membranacea D'Orbigny, 1847 - syn of: Anodontites patagonica J.B.P.A. Lamarck, 1819 - (UNIONIDAE)
- membranacea, Lamellaria membranacea G. Montagu, 1815 - syn of: Pleurobranchus membranaceus (G. Montagu, 1815) - (VELUTINIDAE)
- membranacea cornea, Rissoa membranacea cornea S.L. Lovén, 1846 - syn of: Rissoa membranacea (J. Adams, 1800) - (RISSOIDAE)
- membranacea elata, Rissoa membranacea elata R.A. Philippi, 1844 - (RISSOIDAE)
- membranacea elatopsis, Rissoa membranacea elatopsis P. Mars, 1956 - (RISSOIDAE)
- membranacea gracilis, Rissoa membranacea gracilis E. Forbes & S.C.T. Hanley, 1850 - syn of: Rissoa membranacea (J. Adams, 1800) - (RISSOIDAE)
- membranacea grossa, Rissoa membranacea grossa A. Michaud, 1832 - (RISSOIDAE)
- membranacea hyalina, Rissoa membranacea hyalina Fréminville, 1814 - (RISSOIDAE)
- membranacea labiosa, Rissoa membranacea labiosa (G. Montagu, 1803) - (RISSOIDAE)
- membranacea minor, Rissoa membranacea minor J.G. Jeffreys, 1867 - syn of: Rissoa membranacea (J. Adams, 1800) - (RISSOIDAE)
- membranacea oblonga, Rissoa membranacea oblonga (A.G. Desmarest, 1814) - (RISSOIDAE)
- membranacea octona, Rissoa membranacea octona Auct. non C. Linnaeus, 1767 - syn of: Rissoa membranacea (J. Adams, 1800) - (RISSOIDAE)
- membranaceum, Doridium membranaceum J.F. Meckel, 1809 - syn of: Aglaja tricolorata S.A. Renier, 1807 - (AGLAJIDAE)
- membranaceum, Entolium membranaceum (S. Nilsson, 1827 †) - (ENTOLIIDAE) (FOSSIL)
- membranaceus, Drymaeus membranaceus (L.A. Reeve, 1849) - (BULIMULIDAE)
- membranaceus, Enteroctopus membranaceus A. de Rochebrune & J.F. Mabille, 1889 - (ENTEROCTOPODIDAE)
- membranaceus, Glycymeris membranaceus E.M. Da Costa, 1778 - syn of: Venus casina C. Linnaeus, 1758 - (GLYCYMERIDIDAE)
- membranaceus, Amphioctopus membranaceus (J.R.C. Quoy & J.P. Gaimard, 1832) - (OCTOPODIDAE)
- membranaceus, Pleurobranchus membranaceus (G. Montagu, 1815) - (PLEUROBRANCHIDAE)
- membranaceus, Turbo membranaceus J. Adams, 1800 - syn of: Rissoa membranacea (J. Adams, 1800) - (TURBINIDAE)
- membranula, Anomalocardia membranula A. Römer, 1861 - syn of: Anomalocardia puella (Pfeiffer in R.A. Philippi, 1846) - (VENERIDAE)
- membranula, Murcia membranula A. Römer, 1861 - syn of: Anomalocardia puella (Pfeiffer in R.A. Philippi, 1846) - (VENERIDAE)
- memiae, Conasprella memiae T. Habe & S. Kosuge, 1970 - (CONIDAE)
- memiae, Yeddoconus memiae (T. Habe & S. Kosuge, 1970) - syn of: Conasprella memiae T. Habe & S. Kosuge, 1970 - (CONIDAE)
- memimarumai, Babelomurex memimarumai S. Kosuge, 1985 - (MURICIDAE)
- memmi, Lussivolutopsius memmi Y.I. Kantor, 1990 - (BUCCINIDAE)
- memmiae, Hypselentoma memmiae Termier & Termier, 1977 † - (GOSSELETINIDAE) (FOSSIL)
- memmingeri, Pholas memmingeri M. Tuomey & Holmes, 1858 † - (PHOLADIDAE) (FOSSIL)
- memnonia, Oliva memnonia P.L. Duclos, 1844 - syn of: Americoliva reticularis (J.B.P.A. Lamarck, 1811) - (OLIVIDAE)
- memnonis, Trichia memnonis R. Sturany, 1904 - (HYGROMIIDAE)
- Memorabiliglobus, Genus Memorabiliglobus C. Nielsen, 2003 † (MURICIDAE) (FOSSIL)
- memorabilis, Prolixodens memorabilis A. Cecalupo & I. Perugia, 2012 - (CERITHIOPSIDAE)
- memorabilis, Synthopsis memorabilis A. Cecalupo & I. Perugia, 2012 - (CERITHIOPSIDAE)
- memorabilis, Latouchella memorabilis Rozanov & al., 1969 † - (COREOSPIRIDAE) (FOSSIL)
- memorandum, Gzheloceras memorandum Shimanskiy, 1967 † - (GZHELOCERATIDAE) (FOSSIL)
- memorata, Mendicula memorata T. Iredale, 1924 - (THYASIRIDAE)
- memorata, Ellatrivia merces memorata (H.J. Finlay, 1927) - (TRIVIIDAE)
- memoriaschloenbachi, Placenticeras memoriaschloenbachi Laube & Bruder, 1887 † - (PLACENTICERATIDAE) (FOSSIL)
- mempeli, Maxigoniatites mempeli (A. Schmidt, 1941 †) - (MAXIGONIATITIDAE) (FOSSIL)
- menabensis, Menabites menabensis M. Collignon, 1948 † - (COLLIGNONICERATIDAE) (FOSSIL)
- Menabites, Genus Menabites Collignon , 1948 † (COLLIGNONICERATIDAE) (FOSSIL)
- Menabonites, Genus Menabonites Housa, 1967 † (PACHYDISCIDAE) (FOSSIL)
- menadensis, Longchaeus menadensis (M.M. Schepman, 1907 †) - (PYRAMIDELLIDAE) (FOSSIL)
- menagei, Helicostyla cincinniformis menagei (P. Bartsch, 1941) - (BRADYBAENIDAE)
- menaletta, Columbella menaletta P.L. Duclos, 1846 - (COLUMBELLIDAE)
- menani, Kalidos menani E. Fischer-Piette, Ch.P. Blanc, F. Blanc & F. Salvat, 1993 - (ARIOPHANTIDAE)
- menapiae, Colus menapiae F.W. Harmer, 1914 † - (BUCCINIDAE) (FOSSIL)
- menapiensis, Ctenodonta menapiensis Hicks, 1873 † - syn of: Praenucula menapiensis (Hicks, 1873 †) - (CTENODONTIDAE) (FOSSIL)
- menapiensis, Praenucula menapiensis (Hicks, 1873 †) - (PRAENUCULIDAE) (FOSSIL)
- menardensis, Waagenella menardensis Thein & Nitecki, 1974 † - (BELLEROPHONTIDAE) (FOSSIL)
- menardi, Euchondria menardi A.H. Worthen, 1884 † - (EUCHONDRIIDAE) (FOSSIL)
- menardi, Panopea menardi G.P. Deshayes, 1829 - (HIATELLIDAE)
- menardi, Phacoides menardi (G.P. Deshayes, 1825 †) - (LUCINIDAE) (FOSSIL)
- menardi, Unio menardi J.R. Bourguignat, 1886 - syn of: Coelatura horei menardi J.R. Bourguignat, 1886 - (UNIONIDAE)
- menardi, Coelatura horei menardi J.R. Bourguignat, 1886 - (UNIONIDAE)
- Menathais, Genus Menathais T. Iredale, 1937 (MURICIDAE)
- mencheri, Anticorbula mencheri K.V.W. Palmer, 1945 † - (CORBULIDAE) (FOSSIL)
- menchuescribanae, Dorymenia menchuescribanae Ó. García-Álvarez, V. Urgorri & L. Salvini-Plawén, 2000 - (PRONEOMENIIDAE)
- menciae, Brachypodella menciae C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- menda, Syrnola menda H.J. Finlay, 1926 - (PYRAMIDELLIDAE)
- mendacis, Gibberula mendacis S. Gofas, 1989 - (CYSTISCIDAE)
- mendana, Papuina mendana G.F. Angas, 1867 - (CAMAENIDAE)
- Mendana, Genus Mendana F.C. Baker, 1938 (EUCONULIDAE)
- mendana, Turbonilla mendana A. Peñas & E. Rolán, 2010 - (PYRAMIDELLIDAE)
- mendanaense, Vasticardium mendanaense (G.B. III Sowerby, 1897) - (CARDIIDAE)
- mendanaense, Cardium mendanaense G.B. III Sowerby, 1897 - syn of: Vasticardium mendanaense (G.B. III Sowerby, 1897) - (CARDIIDAE)
- Mendax, Genus Mendax H.J. Finlay, 1927 (CERITHIOPSIDAE)
- mendax, Ashmunella mendax H.A. Pilsbry & J.H. Ferriss, 1917 - (POLYGYRIDAE)
- mendax, Hendersonina mendax (C. de la Torre & P. Bartsch, 1938) - (POMATIIDAE)
- mendax, Protocycloceras mendax (Salter & Murchison, 1859 †) - (PROTOCYCLOCERATIDAE) (FOSSIL)
- mendax, Goniapex mendax F.G. Thompson & E.L. Mihalcik, 2011 - (UROCOPTIDAE)
- Mendelia, Genus Mendelia Frýda , 1998 † (MURCHISONIIDAE) (FOSSIL)
- mendella, Tegula mendella J.H. McLean, 1964 - syn of: Tegula eiseni H.K. Jordan, 1936 - (TEGULIDAE)
- mendenhalli, Sphaerocladiscites mendenhalli (Smith, 1927 †) - (CLADISCITIDAE) (FOSSIL)
- mendenhalli, Anatomites mendenhalli Smith, 1927 † - (HALORITIDAE) (FOSSIL)
- mendenhalli, Argopecten mendenhalli R. Arnold, 1906 † - (PECTINIDAE) (FOSSIL)
- mendenhalli, Pinna mendenhalli G.D. Hanna, 1926 † - (PINNIDAE) (FOSSIL)
- mendesi, Guiratingia mendesi Petri & Fulfaro, 1966 † - (MEGADESMIDAE) (FOSSIL)
- mendezi, Tetrentodon mendezi C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- mendica, Cuna mendica R.K. Dell, 1952 - (CONDYLOCARDIIDAE)
- mendica, Cernuella mendica C. Pollonera, 1892 - syn of: Cernuella neglecta (J.P.R. Draparnaud, 1805) - (HYGROMIIDAE)
- mendica, Rangia mendica (A.A. Gould, 1851) - (MACTRIDAE)
- mendica, Mactra mendica A.A. Gould, 1851 - syn of: Rangia mendica (A.A. Gould, 1851) - (MACTRIDAE)
- mendica, Nassa mendica A.A. Gould, 1850 - syn of: Nassarius mendicus (A.A. Gould, 1850) - (NASSARIIDAE)
- mendica, Hyalinia mendica Slavík, 1869 † - syn of: Oxychilus mendicus (Slavík, 1869 †) - (ZONITIDAE) (FOSSIL)
- mendicaria, Engina mendicaria (C. Linnaeus, 1758) - (BUCCINIDAE)
- mendicaria, Columbella mendicaria C. Linnaeus, 1758 - syn of: Engina mendicaria (C. Linnaeus, 1758) - (COLUMBELLIDAE)
- mendicaria, Hanleya mendicaria J.W. Mighels & C.B. Adams, 1842 - syn of: Hanleya hanleyi (W.I. Bean, 1844) - (HANLEYIDAE)
- mendicaria, Voluta mendicaria C. Linnaeus, 1758 - syn of: Engina mendicaria (C. Linnaeus, 1758) - (VOLUTIDAE)
- mendicaria unilineata, Engina mendicaria unilineata P. Dautzenberg, 1929 - (BUCCINIDAE)
- Mendicula, Genus Mendicula T. Iredale, 1924 (THYASIRIDAE)
- mendicum, Pelagoceras mendicum P.A. Zhuravleva, 1972 † - syn of: Chrysoceras tumidum (P.A. Zhuravleva, 1972 †) - (DISCOSORIDA (unassigned)) (FOSSIL)
- mendicus, Nassarius mendicus (A.A. Gould, 1850) - (NASSARIIDAE)
- mendicus, Oxychilus mendicus (Slavík, 1869 †) - (OXYCHILIDAE) (FOSSIL)
- mendicus, Tropidorbis mendicus T. Iredale, 1936 - syn of: Naricava kimberi (J.C. Verco, 1907) - (TORNIDAE)
- mendicus indisputabilis, Nassarius mendicus indisputabilis I.M. Oldroyd, 1927 - syn of: Nassarius mendicus (A.A. Gould, 1850) - (NASSARIIDAE)
- mendipensis, Actinodonta mendipensis Reed, 1924 † - (ACTINODONTIDAE) (FOSSIL)
- mendipensis, Planorbis mendipensis Moore † - (PLANORBIDAE) (FOSSIL)
- mendipensis, Pleurotomaria mendipensis Moore † - (PLEUROTOMARIIDAE) (FOSSIL)
- mendoncae, Volvarina mendoncae J.A. Ortea, 2014 - (MARGINELLIDAE)
- mendozae, Cernuella mendozae G. Servain in É.A.A. Locard, 1892 - syn of: Cernuella virgata (E.M. Da Costa, 1778) - (HYGROMIIDAE)
- mendozae, Ividella mendozae (F.C. Baker, G.D. Hanna & A.M. Strong, 1928) - (PYRAMIDELLIDAE)
- mendozana, Solenosteira mendozana (S.S. Berry, 1959) - (BUCCINIDAE)
- mendozana, Chilina mendozana P. von Ströbel, 1874 - (CHILINIDAE)
- mendozana, Cotonopsis mendozana D.R. Shasky, 1970 - (COLUMBELLIDAE)
- mendozana, Gerthiceras mendozana Westermann & Riccardi, 1982 † - (HAMMATOCERATIDAE) (FOSSIL)
- mendozana, Eutrochatella mendozana H.A. Pilsbry, 1928 - (HELICINIDAE)
- mendozana, Eunerinea mendozana Cataldo, 2013 † - (NERINELLIDAE) (FOSSIL)
- mendozana, Miraclathurella mendozana D.R. Shasky, 1971 - (PSEUDOMELATOMIDAE)
- mendozana, Badiofaux mendozana (H.A. Pilsbry, 1928) - (UROCOPTIDAE)
- mendozana, Sagracoptis distincta mendozana C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- mendozanus, Bulimulus mendozanus P. von Ströbel, 1874 - (BULIMULIDAE)
- mendozanus bonairensis, Bulimulus mendozanus bonairensis E.L. Holmberg, 1909 - (BULIMULIDAE)
- mendozense, Chondropometes sagebieni mendozense C. de la Torre & P. Bartsch, 1938 - (POMATIIDAE)
- mendranoi, Cernuella mendranoi G. Servain, 1880 - syn of: Cernuella virgata (E.M. Da Costa, 1778) - (HYGROMIIDAE)
- mendranopsis, Cernuella mendranopsis É.A.A. Locard, 1894 - syn of: Cernuella virgata (E.M. Da Costa, 1778) - (HYGROMIIDAE)
- mendryki, Nostoceras mendryki Cobban, 1974 † - (NOSTOCERATIDAE) (FOSSIL)
- menecharmes, Tritonoturris menecharmes (J.C. Melvill, 1923) - (RAPHITOMIDAE)
- menecharmes albescens, Tritonoturris menecharmes albescens (J.C. Melvill, 1923) - (RAPHITOMIDAE)
- meneghiniana, Tauschia meneghiniana (Canavari, 1879 †) - (FISSURELLIDAE) (FOSSIL)
- meneghiniana, Prososthenia meneghiniana (C. De Stefani, 1874 †) - (HYDROBIIDAE) (FOSSIL)
- meneghiniana, Turricaspia meneghiniana (A. Issel, 1865) - (HYDROBIIDAE)
- meneghiniana ukrainica, Turricaspia meneghiniana ukrainica T.L. Alexenko & Y.I. Starobogatov, 1987 - syn of: Euxinipyrgula ukrainica (T.L. Alexenko & Y.I. Starobogatov, 1987) - (HYDROBIIDAE)
- meneghinianus, Bulinus meneghinianus M. Paulucci, 1882 - syn of: Bulinus truncatus (J.V. Audouin, 1827) - (PLANORBIDAE)
- Meneghiniceras, Subgenus Juraphyllites (Meneghiniceras) Gemmellaro, 1884 † (JURAPHYLLITIDAE) (FOSSIL)
- meneghinii, Mojsisovicsteuthis meneghinii (Jeletzky, 1965 †) - (AULACOCERIDA (UNASSIGNED)) (FOSSIL)
- meneghinii, Asthenotoma meneghinii (C. Mayer, 1868 †) - (BORSONIIDAE) (FOSSIL)
- meneghinii, Cerithium meneghinii O.G. Michelotti, 1861 † - (CERITHIIDAE) (FOSSIL)
- meneghinii, Chiton meneghinii G. Capellini, 1859 - syn of: Ischnochiton rissoi Angelo & C. Smriglio, 1999 - (CHITONIDAE)
- meneghinii, Goniatites meneghinii C. Gemmellaro, 1887 † - syn of: Epiglyphioceras meneghinii (C. Gemmellaro, 1887 †) - (GONIATITIDAE) (FOSSIL)
- meneghinii, Crestaites meneghinii (Bonarelli, 1899 †) - (HAMMATOCERATIDAE) (FOSSIL)
- meneghinii, Dumortieria meneghinii (C.A. von Zittel, 1887 †) - (HILDOCERATIDAE) (FOSSIL)
- meneghinii, Histioteuthis meneghinii G.J. Pfeffer, 1912 - syn of: Histioteuthis reversa (A.E. Verrill, 1880) - (HISTIOTEUTHIDAE)
- meneghinii, Ischnochiton meneghinii G. Capellini, 1859 - syn of: Ischnochiton rissoi Angelo & C. Smriglio, 1999 - (ISCHNOCHITONIDAE)
- meneghinii, Gonimyrtea meneghinii (C. De Stefani & D. Pantanelli, 1880 †) - (LUCINIDAE) (FOSSIL)
- meneghinii, Epiglyphioceras meneghinii (C. Gemmellaro, 1887 †) - (METALEGOCERATIDAE) (FOSSIL)
- meneghinii, Metarmenoceras meneghinii Serpagli & Gnoli, , 1977 † - (ORMOCERATIDAE) (FOSSIL)
- meneghinii, Phylloceras meneghinii C. Gemmellaro, 1874 † - (PHYLLOCERATIDAE) (FOSSIL)
- meneghinii, Physa meneghinii F. Sacco, 1886 † - (PHYSIDAE) (FOSSIL)
- meneghinii, Pleurotoma meneghinii C. Mayer, 1868 - syn of: Asthenotoma meneghinii (C. Mayer, 1868 †) - (TURRIDAE)
- meneguzzoi, Cerithium meneguzzoi A. Fuchs, 1870 † - (CERITHIIDAE) (FOSSIL)
- menehune, Vexillum menehune R. Salisbury, 2011 - (COSTELLARIIDAE)
- menelaus, Albinaria menelaus (E.C. Von Martens, 1873) - (CLAUSILIIDAE)
- menelaus semicostulata, Albinaria menelaus semicostulata (O. Böttger, 1878) - (CLAUSILIIDAE)
- meneliki, Physopsis meneliki J.R. Bourguignat, 1885 - (PLANORBIDAE)
- meneliki, Unio meneliki Soleillet, 1885 - syn of: Unio mancus J.B.P.A. Lamarck, 1819 - (UNIONIDAE)
- menengtengana, Arca menengtengana K. Martin, 1910 † - (ARCIDAE) (FOSSIL)
- menengtengana, Ficus menengtengana Martin, 1899 † - (FICIDAE) (FOSSIL)
- menengtenganus, Conus menengtenganus Martin, 1895 † - (CONIDAE) (FOSSIL)
- menense, Nordophiceras menense A.M. Popov, 1962 † - (MEEKOCERATIDAE) (FOSSIL)
- Menesthella, Genus Menesthella Nomura, 1939 (PYRAMIDELLIDAE)
- Menestho, Genus Menestho H.P.C. Mřller, 1842 (PYRAMIDELLIDAE)
- menesthoides, Couthouyella menesthoides (P.P. Carpenter, 1864) - (EPITONIIDAE)
- menesthoides, Acirsa menesthoides P.P. Carpenter, 1864 - syn of: Couthouyella menesthoides (P.P. Carpenter, 1864) - (EPITONIIDAE)
- Menetus, Genus Menetus H. Adams & A. Adams, 1855 (PLANORBIDAE)
- mengaburensis, Plectostoma mengaburensis T.S. Liew, J.J. Vermeulen & alias, 2014 - (DIPLOMMATINIDAE)
- mengeana, Solenosteira mengeana W.H. Dall, 1890 - (BUCCINIDAE)
- mengeana, Urosalpinx mengeana W.H. Dall, 1890 † - (MURICIDAE) (FOSSIL)
- menglaensis, Cipangopaludina menglaensis Zhang, H.X. Liu & Wang, 1981 - (VIVIPARIDAE)
- menglunanensis, Phaedusa bocki menglunanensis (C. Chen & S.Q. Zhang, 1999) - (CLAUSILIIDAE)
- menglunensis, Cryptozona menglunensis C. Chen, S.P. Zhang & X.T. Ma, 1995 - (ARIOPHANTIDAE)
- menglunensis, Camaena menglunensis C. Chen, 1999 - (CAMAENIDAE)
- menglunensis, Sinoennea menglunensis Wang, C. Chen, W.C. Zhou & Hwang, 2015 - (DIAPHERIDAE)
- Mengoana, Genus Mengoana A. Ortiz De Zárate, 1951 (HYGROMIIDAE)
- mengoiana, Anodonta mengoiana J. Da Silva e Castro, 1883 - syn of: Anodonta cygnea (C. Linnaeus, 1758) - (UNIONIDAE)
- mengrelica, Crassunio mengrelica H. Drouët, 1881 - syn of: Unio crassus L. Philipsson in A. Retzius, 1788 - (UNIONIDAE)
- mengyinense, Bithynia mengyinense A.W. Grabau, 1923 † - (BITHYNIIDAE) (FOSSIL)
- menindie, Phyllidia menindie D.J. Brunckhorst, 1993 - syn of: Phyllidia picta (A. Pruvot-Fol, 1957) - (PHYLLIDIIDAE)
- meningeus, Conus meningeus P.F. Röding, 1798 - syn of: Puncticulis zeylanicus (J.F. Gmelin, 1791) - (CONIDAE)
- meninxica, Cernuella meninxica A. Letourneux & J.R. Bourguignat, 1887 - syn of: Cernuella virgata (E.M. Da Costa, 1778) - (HYGROMIIDAE)
- Menippe, syn of: Genus Aclis S.L. Lovén, 1846 (ACLIDIDAE)
- Meniscoceras, Genus Meniscoceras Flower, 1941 † (PROTEROCAMEROCERATIDAE) (FOSSIL)
- meniscoides, Hippeutis meniscoides R. Tate, 1882 - (PLANORBIDAE)
- meniscus, Striatura meniscus C.M.F. Ancey, 1904 - (GASTRODONTIDAE)
- menisi, Micromelania menisi Š. Brusina, 1902 † - (HYDROBIIDAE) (FOSSIL)
- Menjaites, Genus Menjaites Sazonova , 1971 † (POLYPTYCHITIDAE) (FOSSIL)
- menkarai, Africarca menkarai (Strougo 1979) † - (GLYCYMERIDIDAE) (FOSSIL)
- menkeana, Pupa menkeana L. Pfeiffer, 1853 - syn of: Gulella menkeana (L. Pfeiffer, 1853) - (ACTEONIDAE)
- menkeana, Engina menkeana (R.W. Dunker, 1860) - (BUCCINIDAE)
- menkeana, Trachycystis menkeana (L. Pfeiffer, 1857) - (CHAROPIDAE)
- menkeana, Azeca menkeana (C. Pfeiffer, 1821) - (COCHLICOPIDAE)
- menkeana, Mitrella menkeana (L.A. Reeve, 1858) - (COLUMBELLIDAE)
- menkeana, Columbella menkeana L.A. Reeve, 1858 - syn of: Mitrella menkeana (L.A. Reeve, 1858) - (COLUMBELLIDAE)
- menkeana, Cypraea menkeana G.P. Deshayes, 1863 - syn of: Bistolida owenii (J.E. Gray in G.B. II Sowerby, 1832) - (CYPRAEIDAE)
- menkeana, Diodora menkeana (R.W. Dunker, 1846) - (FISSURELLIDAE)
- menkeana, Theba menkeana A. Moquin-Tandon - syn of: Theba pisana (O.F. Müller, 1774) - (HELICIDAE)
- menkeana, Helicina menkeana R.A. Philippi, 1847 - (HELICINIDAE)
- menkeana, Natica menkeana R.A. Philippi, 1851 - (NATICIDAE)
- menkeana, Nerita menkeana C.A. Récluz, 1842 - (NERITIDAE)
- menkeana, Plicatula menkeana H.J. Finlay, 1927 - syn of: Plicatula plicata (C. Linnaeus, 1767) - (PLICATULIDAE)
- menkeana, Gari menkeana G.P. Deshayes, 1855 - syn of: Gari modesta (G.P. Deshayes, 1855) - (PSAMMOBIIDAE)
- menkeana, Psammobia menkeana G.P. Deshayes, 1855 - syn of: Gari modesta (G.P. Deshayes, 1855) - (PSAMMOBIIDAE)
- menkeana, Gulella menkeana (L. Pfeiffer, 1853) - (STREPTAXIDAE)
- menkeana, Succinea menkeana L. Pfeiffer, 1850 - (SUCCINEIDAE)
- menkeana, Melania menkeana H.C. Lea, 1842 - syn of: Brotia costula (C.S. Rafinesque, 1833) - (THIARIDAE)
- menkeana, Borysthenia menkeana (K.R. Jelski, 1863) - (VALVATIDAE)
- menkeana purpureocincta, Mitrella menkeana purpureocincta J.C. Verco, 1910 - syn of: Zemitrella purpureocincta (J.C. Verco, 1910) - (COLUMBELLIDAE)
- menkeana submenkeana, Engina menkeana submenkeana H.A. Pilsbry, 1901 - (BUCCINIDAE)
- menkeanum, Azeca menkeanum C. Pfeiffer, 1821 - syn of: Azeca goodalli (A.E.J. Férussac, 1821) - (COCHLICOPIDAE)
- menkeanum, Sinum menkeanum R.W. Dunker, 1855 - syn of: Sinum bifasciatum (C.A. Récluz, 1851) - (NATICIDAE)
- menkeanus, Cyclophorus menkeanus (R.A. Philippi, 1848) - (CYCLOPHORIDAE)
- menkeanus, Mytilus menkeanus R.A. Philippi, 1847 - syn of: Brachidontes erosus (J.B.P.A. Lamarck, 1819) - (MYTILIDAE)
- menkeanus, Brachidontes menkeanus R.A. Philippi, 1847 - syn of: Brachidontes erosus (J.B.P.A. Lamarck, 1819) - (MYTILIDAE)
- menkeanus, Planaxis menkeanus R.W. Dunker, 1861 - (PLANAXIDAE)
- menkei, Drymaeus menkei Ermst C.L. Gruner, 1841 - syn of: Mesembrinus multilineatus menkei (Ermst C.L. Gruner, 1841) - (BULIMULIDAE)
- menkei, Mesembrinus multilineatus menkei (Ermst C.L. Gruner, 1841) - (BULIMULIDAE)
- menkei, Cerithium menkei P.P. Carpenter, 1857 - (CERITHIIDAE)
- menkei, Cerithium menkei G.P. Deshayes, 1863 - syn of: Cerithium columna G.B. I Sowerby, 1834 - (CERITHIIDAE)
- menkei, Azeca menkei C. Pfeiffer, 1821 - syn of: Azeca goodalli (A.E.J. Férussac, 1821) - (COCHLICOPIDAE)
- menkei, Eomiodon menkei (R.W. Dunker, 1846 †) - (NEOMIODONTIDAE) (FOSSIL)
- menkei, Pinna menkei L.A. Reeve, 1858 - syn of: Pinna bicolor J.F. Gmelin, 1791 - (PINNIDAE)
- menkei, Marmarostoma menkei K.H.J. Thiele, 1930 - syn of: Carswellena haynesi (H.B. Preston, 1914) - (TURBINIDAE)
- menkei, Unio menkei F.C.L. Koch & R.W. Dunker, 1847 † - (UNIONIDAE) (FOSSIL)
- menkei, Gafrarium menkei (I.H. Jonas, 1846) - (VENERIDAE)
- menkhorsti, Elia menkhorsti E. Neubert, 1995 - (CLAUSILIIDAE)
- menkhorsti, Albinaria papillifera menkhorsti H. Nordsieck, 1993 - (CLAUSILIIDAE)
- menkhorsti, Ena menkhorsti B. Hausdorf & R.A. Bank, 2001 - (ENIDAE)
- menkhorsti, Caucasocressa menkhorsti B. Hausdorf, 2003 - (HYGROMIIDAE)
- menkhorsti, Monacha menkhorsti B. Hausdorf, 2000 - (HYGROMIIDAE)
- menkhorsti, Bela menkhorsti J.J. Van Aartsen, 1988 - (MANGELIIDAE)
- menkhorsti, Orculella menkhorsti B. Hausdorf, 1996 - (ORCULIDAE)
- menkhorsti, Oxychilus menkhorsti F. Riedel, 1995 - (OXYCHILIDAE)
- menkhorsti, Chrysallida menkhorsti J.J. Van Aartsen, E. Gittenberger & J. Goud, 2000 - (PYRAMIDELLIDAE)
- menkhorsti, Graphis menkhorsti D. De Jong & H.E. Coomans, 1988 - (TOFANELLIDAE)
- Menkia, Genus Menkia H.D. Boeters, E. Gittenberger & P. Subai, 1985 (ACICULIDAE)
- menkiana, Melania menkiana H.C. Lea, 1842 - syn of: Brotia costula (C.S. Rafinesque, 1833) - (THIARIDAE)
- menkrawitensis, Conus menkrawitensis Beets, 1941 † - (CONIDAE) (FOSSIL)
- menkrawitensis, Cryptoplax menkrawitensis C. Beets, 1941 † - (CRYPTOPLACIDAE) (FOSSIL)
- menkrawitensis, Cancilla menkrawitensis C. Beets, 1941 † - (MITRIDAE) (FOSSIL)
- menkrawitensis, Chlamys menkrawitensis C. Beets, 1941 † - (PECTINIDAE) (FOSSIL)
- menkveldae, Pacaudina menkveldae J.J. Vermeulen & al., 2010 † - (ANAHAMULINIDAE) (FOSSIL)
- menneri, Keenocardium menneri A.I. Kafanov, 1984 † - (CARDIIDAE) (FOSSIL)
- menneri, Pavlovia menneri (Michailov, 1957 †) - (DORSOPLANITIDAE) (FOSSIL)
- menneri, Carinoceras menneri Ljaschenko, 1957 † - (GEPHUROCERATIDAE) (FOSSIL)
- menneri, Makarenkoplax menneri (Makarenko, 1969 †) - (MAKARENKOPLACIDAE) (FOSSIL)
- menneri, Menneroceras menneri Andrianov, 1985 † - (METALEGOCERATIDAE) (FOSSIL)
- menneri, Retroceramus menneri Koschelkina, 1960 † - (RETROCERAMIDAE) (FOSSIL)
- Mennerilites, Genus Mennerilites Lyashenko, 1969 † (TENTACULITA (UNASSIGNED)) (FOSSIL)
- Menneroceras, Genus Menneroceras Andrianov , 1985 † (METALEGOCERATIDAE) (FOSSIL)
- Menneroctenia, Genus Menneroctenia Kalishevich, 1973 † (NUCULIDA (UNASSIGNED)) (FOSSIL)
- mennessieri, Pseudomesalia mennessieri Pereira, Cassab & Barreto, 2016 † - (TURRITELLIDAE) (FOSSIL)
- Mennessieria, Genus Mennessieria Calzada, 1987 † (CASSIOPIDAE) (FOSSIL)
- mennoi, Napaeopsis mennoi E. Gittenberger, 2008 - (ENIDAE)
- mennoi, Crassispira mennoi D. De Jong & H.E. Coomans, 1988 - (PSEUDOMELATOMIDAE)
- mennonitarum, Conus mennonitarum L.W. Dillwyn, 1817 - syn of: Fraterconus distans (C.H. Hwass in J.G. Bruguière, 1792) - (CONIDAE)
- menoi, Boucardicus menoi K.C. Emberton, 2010 - (CYCLOPHORIDAE)
- Menomphis, syn of: Genus Triodopsis C.S. Rafinesque, 1819 (POLYGYRIDAE)
- Menon, Genus Menon C. Hedley, 1900 (EULIMIDAE)
- menoui, Favartia menoui (R. Houart, 1990) - (MURICIDAE)
- menoui, Pygmaepterys menoui (R. Houart, 1990) - syn of: Favartia menoui (R. Houart, 1990) - (MURICIDAE)
- menoui, Specula menoui Cecalupo & Perugia, 2017 - (NEWTONIELLIDAE)
- menoui, Turbonilla menoui A. Peñas & E. Rolán, 2010 - (PYRAMIDELLIDAE)
- mensinki, Polonoceras mensinki Becker, 1993 † - (TORNOCERATIDAE) (FOSSIL)
- menstrualis, Sunetta menstrualis (K.T. Menke, 1843) - (VENERIDAE)
- menstrualis, Meroe menstrualis L.A. Reeve, 1864 - syn of: Sunetta sunettina (F.P. Jousseaume, 1891) - (VENERIDAE)
- menstrualis, Sunetta menstrualis L.A. Reeve, 1864 - syn of: Sunetta sunettina (F.P. Jousseaume, 1891) - (VENERIDAE)
- mentaweiensis, Oospira brevior mentaweiensis (P. Ehrmann, 1928) - (CLAUSILIIDAE)
- menteathi, Suessionia menteathi A.E.M. Cossmann, 1923 † - (BUCCINIDAE) (FOSSIL)
- menteathi, Turricula menteathi (A.E.M. Cossmann, 1923 †) - (CLAVATULIDAE) (FOSSIL)
- Menthafonia, Genus Menthafonia MacNeil & Dockery, 1984 † (CAENOGASTROPODA (UNASSIGNED)) (FOSSIL)
- menthafons, Acteon menthafons McNeil, 1984 † - (ACTEONIDAE) (FOSSIL)
- menthafontis, Goniocheila menthafontis (F.S. MacNeil, 1984 †) - (APORRHAIDAE) (FOSSIL)
- menthafontis, Solariella menthafontis McNeil, 1984 † - (SOLARIELLIDAE) (FOSSIL)
- menthifonta, Fustiaria menthifonta D.T. Dockery, 1984 † - (FUSTIARIIDAE) (FOSSIL)
- menthifontis, Astarte menthifontis D.T. Dockery, 1982 † - (ASTARTIDAE) (FOSSIL)
- menthifontis, Trinacria menthifontis D.T. Dockery, 1982 † - (NOETIIDAE) (FOSSIL)
- menthifontis, Lyropecten menthifontis Glawe, 1970 † - (PECTINIDAE) (FOSSIL)
- mentiens, Fulgoraria mentiens (H.C. Fulton, 1940) - (VOLUTIDAE)
- mentiens, Psephaea mentiens (H.C. Fulton, 1940) - syn of: Fulgoraria mentiens (H.C. Fulton, 1940) - (VOLUTIDAE)
- Mentissa, Genus Mentissa H. Adams & A. Adams, 1855 (CLAUSILIIDAE)
- Mentissella, Genus Mentissella H. Nordsieck, 1973 (CLAUSILIIDAE)
- Mentissoidea, Genus Mentissoidea O. Böttger, 1877 (CLAUSILIIDAE)
- mentonicus, Deroceras mentonicus G. Nevill, 1880 - syn of: Deroceras laeve (O.F. Müller, 1774) - (AGRIOLIMACIDAE)
- menu, Ammonites menu E. Forbes, 1846 † - syn of: Menuites menu (E. Forbes, 1846 †) - (AMMONITIDA (unassigned)) (FOSSIL)
- menu, Menuites menu (E. Forbes, 1846 †) - (PACHYDISCIDAE) (FOSSIL)
- menuda, Nuculavus menuda B.S. Kues, 1991 † - (NUCULIDAE) (FOSSIL)
- Menuites, Genus Menuites Spath , 1922 † (PACHYDISCIDAE) (FOSSIL)
- Menuthiocrioceras, Genus Menuthiocrioceras Collignon , 1949 † (CRIOCERATITIDAE) (FOSSIL)
- Menuthionautilus, Genus Menuthionautilus Collignon , 1933 † (GRYPOCERATIDAE) (FOSSIL)
- Menuthionautlis, Genus Menuthionautlis Collignon, 1933 † (NAUTILIDA (UNASSIGNED)) (FOSSIL)
- menzeliana, Xerosecta euphorcella menzeliana (P.M. Pallary, 1920) - (HYGROMIIDAE)
- menzieni, Unio menzieni I. Lea, 1870 - syn of: Echyridella menziesii (J.E. Gray in J.K.E. Dieffenbach, 1843) - (UNIONIDAE)
- menziesi, Neilonella menziesi A.H. Clarke, 1959 - (NEILONELLIDAE)
- menziesi lucasi, Hyridella menziesi lucasi H.H. Suter, 1905 - syn of: Echyridella lucasi (H.H. Suter, 1905) - (HYRIIDAE)
- menziesianus, Unio menziesianus L.A. Reeve, 1865 - syn of: Echyridella menziesii (J.E. Gray in J.K.E. Dieffenbach, 1843) - (UNIONIDAE)
- menziesii, Echyridella menziesii (J.E. Gray in J.K.E. Dieffenbach, 1843) - (HYRIIDAE)
- menziesii, Unio menziesii J.K.E. Dieffenbach, 1843 - syn of: Echyridella menziesii (J.E. Gray in J.K.E. Dieffenbach, 1843) - (UNIONIDAE)
- menziesii acuta, Echyridella menziesii acuta (H.H. Suter, 1907) - (HYRIIDAE)
- menziesii depauperata, Echyridella menziesii depauperata (F.W. Hutton, 1882) - (HYRIIDAE)
- menziesii hochstetteri, Echyridella menziesii hochstetteri (R.W. Dunker, 1862) - (HYRIIDAE)
- menziezi, Hyridella menziezi C.T. Simpson, 1900 - syn of: Echyridella menziesii (J.E. Gray in J.K.E. Dieffenbach, 1843) - (HYRIIDAE)
- menziezianus, Unio menziezianus C.T. Simpson, 1900 - syn of: Echyridella menziesii (J.E. Gray in J.K.E. Dieffenbach, 1843) - (UNIONIDAE)
- meobambensis, Isomeria meobambensis (L. Pfeiffer, 1857) - (CAMAENIDAE)
- meobambensis, Sultana meobambensis (L. Pfeiffer, 1855) - (ORTHALICIDAE)
- meobambensis carnea, Sultana meobambensis carnea H. Strebel, 1909 - syn of: Sultana meobambensis (L. Pfeiffer, 1855) - (ORTHALICIDAE)
- Meotolima, syn of: Genus Lima J.G. Bruguičre, 1789 (LIMIDAE)
- Meotolima, syn of: Genus Lima J.G. Bruguičre, 1789 (LIMIDAE)
- mephitica, Atagema mephitica L.S.R. Bergh, 1878 - syn of: Atagema spongiosa (E.F. Kelaart, 1858) - (DISCODORIDIDAE)
- mephitifontis, Glabrocingulum mephitifontis W.J. Gordon & E.L. Yochelson, 1987 † - (GOSSELETINIDAE) (FOSSIL)
- mera, Platydoris mera J. Alder & A. Hancock, 1854 - syn of: Platydoris argo (C. Linnaeus, 1767) - (DISCODORIDIDAE)
- mera, Doris mera J. Alder & A. Hancock, 1844 - syn of: Doris pseudoargus J.L. Rapp, 1827 - (DORIDIDAE)
- mera, Mactra mera L.A. Reeve, 1854 - (MACTRIDAE)
- mera, Mactra grandis mera G.P. Deshayes, 1854 - (MACTRIDAE)
- mera, Philine mera Er. Marcus & Ev. Marcus, 1969 - (PHILINIDAE)
- mera, Odostomia mera C.F. Laseron, 1959 - (PYRAMIDELLIDAE)
- mera, Tellina mera T. Say, 1834 - (TELLINIDAE)
- mera, Hastula mera R.B. Hinds, 1844 - syn of: Hastula albula (K.T. Menke, 1843) - (TEREBRIDAE)
- meraca, Chloritis meraca (T. Iredale, 1941) - (CAMAENIDAE)
- meraca, Pillomena meraca (J.C. Cox & F.L.S. Hedley, 1912) - (CHAROPIDAE)
- meraca, Palaeomutela meraca Betekhtina † - (PALAEOMUTELIDAE) (FOSSIL)
- Meracomelon, Genus Meracomelon T. Iredale, 1933 (CAMAENIDAE)
- Meracomelon, syn of: Genus Cupedora T. Iredale, 1933 (CAMAENIDAE)
- meracula, Goniodoris meracula R.F. Burn, 1958 - (GONIODORIDIDAE)
- meracus, Sirius meracus T. Iredale, 1936 - syn of: Sirius badius (J.E. Tenison-Woods, 1878) - (CAPULIDAE)
- meracus chrestus, Sirius meracus chrestus T. Iredale, 1936 - syn of: Sirius badius (J.E. Tenison-Woods, 1878) - (CAPULIDAE)
- meracus desponsus, Sirius meracus desponsus T. Iredale, 1936 - syn of: Sirius badius (J.E. Tenison-Woods, 1878) - (CAPULIDAE)
- Meragoniatites, Genus Meragoniatites Korn , 2001 † (ATLANTOCERATIDAE) (FOSSIL)
- meralae, Pseudamnicola meralae P. Glöer, M.E. Gürlek & C. Kara, 2014 - (HYDROBIIDAE)
- merali, Pseudamnicola merali P. Glöer, M.E. Gürlek & C. Kara, 2014 - (HYDROBIIDAE)
- meramecensis, Titanoplina meramecensis Stinchcomb & Angeli, 2002 † - (PROPLINIDAE) (FOSSIL)
- meramecensis, Proplina meramecensis Stinchcomb, 1986 † - (TRYBLIDIIDAE) (FOSSIL)
- meramecensis, Ozarkplina meramecensis Stinchcomb, 1986 † - (TRYBLIDIIDAE) (FOSSIL)
- meramecensis, Vertigo meramecensis J.C. van Hasselt, 1835 - (VERTIGINIDAE)
- merangiana, Miltha merangiana Martin, 1922 † - (LUCINIDAE) (FOSSIL)
- merangiana, Tateiwaia merangiana (K. Martin, 1922 †) - (POTAMIDIDAE) (FOSSIL)
- merangiana, Tellina merangiana Martin, 1922 † - (TELLINIDAE) (FOSSIL)
- meranginana, Proclava meranginana (Martin, 1922 †) - (CERITHIIDAE) (FOSSIL)
- merarcha, Neocepolis merarcha (J.F. Mabille, 1888) - (CAMAENIDAE)
- meratensis, Bythiospeum meratensis E. Pezzoli, 2004 - (HYDROBIIDAE)
- meratusensis, Diplommatina meratusensis J.J. Vermeulen, 1993 - (DIPLOMMATINIDAE)
- mercadali, Ortizius mercadali L. Gasull, 1970 - (OXYCHILIDAE)
- mercadoi, Scalptia mercadoi W.E. Old, 1968 - (CANCELLARIIDAE)
- mercaensis, Ocenebra mercaensis G.S. Coen, 1947 - syn of: Ocenebra erinaceus (C. Linnaeus, 1758) - (MURICIDAE)
- mercati, Conus mercati G.B. Brocchi, 1814 † - (CONIDAE) (FOSSIL)
- mercati, Mercaticeras mercati (J. Von Hauer, 1856 †) - (HILDOCERATIDAE) (FOSSIL)
- mercati, Strombus mercati G.P. Deshayes, 1835 † - syn of: Persististrombus coronatus (J.L.M. Defrance, 1827 †) - (STROMBIDAE) (FOSSIL)
- mercati austriacus, Conus mercati austriacus R. Hoernes & M. Auinger, 1882 † - (CONIDAE) (FOSSIL)
- Mercaticeras, Genus Mercaticeras Meneghini, 1883 † (HILDOCERATIDAE) (FOSSIL)
- mercator, Lautoconus mercator (C. Linnaeus, 1758) - (CONIDAE)
- mercator cacao, Lautoconus mercator cacao (M. Ferrario, 1983) - (CONIDAE)
- mercator dealbatus, Conus mercator dealbatus A. Adams, 1855 - syn of: Lautoconus dealbatus (A. Adams, 1855) - (CONIDAE)
- Mercatora, syn of: Genus Plaxiphora J.E. Gray, 1847 (MOPALIIDAE)
- mercatoria, Columbella mercatoria (C. Linnaeus, 1758) - (COLUMBELLIDAE)
- Mercatoria, syn of: Genus Monetaria F.H. Troschel, 1863 (CYPRAEIDAE)
- mercatoria, Oliva mercatoria F.P. Marrat, 1871 - syn of: Oliva tisiphona mercatoria F.P. Marrat, 1871 - (OLIVIDAE)
- mercatoria, Oliva tisiphona mercatoria F.P. Marrat, 1871 - (OLIVIDAE)
- mercatoria, Voluta mercatoria C. Linnaeus, 1758 - syn of: Pisania striata (J.F. Gmelin, 1791) - (VOLUTIDAE)
- mercatoria elongata, Columbella mercatoria elongata G.W. Nowell-Usticke, 1959 - (COLUMBELLIDAE)
- mercatoria scalaris, Columbella mercatoria scalaris W. Kobelt, 1897 - syn of: Columbella mercatoria (C. Linnaeus, 1758) - (COLUMBELLIDAE)
- mercatorina, Helix mercatorina J.F. Mabille, 1887 - syn of: Neocepolis morleti (P. Dautzenberg & d'Hamonville, 1887) - (HELICIDAE)
- mercatoris, Afrololigo mercatoris (W. Adam, 1941) - (LOLIGINIDAE)
- mercatoris, Plaxiphora mercatoris (E.H.J. Leloup, 1936) - (MOPALIIDAE)
- mercatoris, Mercatora mercatoris E.H.J. Leloup, 1936 - syn of: Plaxiphora mercatoris (E.H.J. Leloup, 1936) - (MOPALIIDAE)
- mercatoris, Octopus mercatoris W. Adam, 1937 - (OCTOPODIDAE)
- mercatoris, Megalomphalus mercatoris W. Adam & J. Knudsen, 1969 - syn of: Megalomphalus disciformis (J. Granata Grillo, 1877) - (VANIKORIDAE)
- mercatorium, Cerastoderma mercatorium G.S. Coen, 1915 - syn of: Cerastoderma edule (C. Linnaeus, 1758) - (CARDIIDAE)
- mercatorium, Monetaria mercatorium A. de Rochebrune, 1884 - syn of: Monetaria moneta (C. Linnaeus, 1758) - (CYPRAEIDAE)
- mercatorius, Coniglobus mercatorius (L. Pfeiffer, 1845) - (CAMAENIDAE)
- mercatorius, Pericyclus mercatorius W. Korn & al., 2003 † - (PERICYCLIDAE) (FOSSIL)
- mercatorius ammiralis, Coniglobus mercatorius ammiralis (L. Pfeiffer, 1857) - (CAMAENIDAE)
- mercatorius atratus, Coniglobus mercatorius atratus (H.A. Pilsbry & J.T. Gulick, 1900) - (CAMAENIDAE)
- mercatorius daemonorus, Coniglobus mercatorius daemonorus T. Habe & M. Chinen, 1985 - (CAMAENIDAE)
- mercatorius euterpe, Coniglobus mercatorius euterpe (H.A. Pilsbry & Y. Hirase, 1903) - (CAMAENIDAE)
- mercatorius iejimanus, Coniglobus mercatorius iejimanus (H.A. Pilsbry & Y. Hirase, 1905) - (CAMAENIDAE)
- mercatorius katsurenensis, Coniglobus mercatorius katsurenensis T. Habe & M. Chinen, 1985 - (CAMAENIDAE)
- mercatorius miyakoensis, Coniglobus mercatorius miyakoensis M. Azuma, 1987 - (CAMAENIDAE)
- mercatorius okinoerabuensis, Coniglobus mercatorius okinoerabuensis T. Habe & M. Chinen, 1985 - (CAMAENIDAE)
- mercedensis, Mactromeris mercedensis A. Packard, 1916 † - (MACTRIDAE) (FOSSIL)
- mercedesae, Turbonilla mercedesae A. Peñas & E. Rolán, 2010 - (PYRAMIDELLIDAE)
- mercedesensis, Torrecoptis mercedesensis (H.A. Pilsbry, 1930) - (UROCOPTIDAE)
- mercedesi, Candidula mercedesi G. Servain, 1880 - syn of: Candidula arganica (G. Servain, 1880) - (HYGROMIIDAE)
- mercedordae, Sayella mercedordae A. Peñas & E. Rolán, 1997 - (PYRAMIDELLIDAE)
- Mercenaria, Genus Mercenaria H.C.F. Schumacher, 1817 (VENERIDAE)
- mercenaria, Mercenaria mercenaria (C. Linnaeus, 1758) - (VENERIDAE)
- mercenaria alba, Venus mercenaria alba W.H. Dall, 1902 - syn of: Mercenaria mercenaria (C. Linnaeus, 1758) - (VENERIDAE)
- mercenaria antiqua, Venus mercenaria antiqua A.E. Verrill, 1875 - syn of: Mercenaria mercenaria (C. Linnaeus, 1758) - (VENERIDAE)
- mercenaria notata, Mercenaria mercenaria notata T. Say, 1822 - (VENERIDAE)
- mercenaria radiata, Venus mercenaria radiata W.H. Dall, 1902 - syn of: Mercenaria mercenaria (C. Linnaeus, 1758) - (VENERIDAE)
- mercenaria subradiata, Venus mercenaria subradiata K.V.W. Palmer, 1927 - syn of: Mercenaria mercenaria (C. Linnaeus, 1758) - (VENERIDAE)
- mercenaroides, Mercimonia mercenaroides † - (VENERIDAE) (FOSSIL)
- mercerati, Modiomytilus mercerati Griffin 1990 † - (MYTILIDA (UNASSIGNED)) (FOSSIL)
- mercerensis, Nucula mercerensis McChesney, 1868 † - syn of: Cardiomorpha missouriensis Shumard & Swallow, 1858 † - (NUCULIDAE) (FOSSIL)
- mercerii, Unio mercerii I. Lea, 1862 - syn of: Elliptio pullata (I. Lea, 1856) - (UNIONIDAE)
- merces, Ellatrivia merces (T. Iredale, 1924) - (TRIVIIDAE)
- merces, Triviella merces T. Iredale, 1924 - syn of: Ellatrivia merces (T. Iredale, 1924) - (TRIVIIDAE)
- merces, Trivia merces T. Iredale, 1924 - syn of: Ellatrivia merces (T. Iredale, 1924) - (TRIVIIDAE)
- merces addenda, Ellatrivia merces addenda T. Iredale, 1931 - syn of: Ellatrivia merces (T. Iredale, 1924) - (TRIVIIDAE)
- merces memorata, Ellatrivia merces memorata (H.J. Finlay, 1927) - (TRIVIIDAE)
- merceyi, Margostrea merceyi (Coquand 1869) † - (OSTREIDAE) (FOSSIL)
- mercieri, Elysia mercieri (A. Pruvot-Fol, 1930) - (PLAKOBRANCHIDAE)
- Mercimonia, Genus Mercimonia Dall , 1902 † (VENERIDAE) (FOSSIL)
- merciniensis, Amaurellina merciniensis G.P. Deshayes, 1864 † - (AMPULLINIDAE) (FOSSIL)
- merciniensis, Natica merciniensis G.P. Deshayes, 1864 † - syn of: Ampullina lignitarum G.P. Deshayes, 1864 † - (NATICIDAE) (FOSSIL)
- Mercuria, Genus Mercuria H.D. Boeters, 1971 (HYDROBIIDAE)
- mercuria, Chlamys mercuria J. Marwick, 1928 † - (PECTINIDAE) (FOSSIL)
- mercurialis, Goniodoris mercurialis W. Macnae, 1958 - (GONIODORIDIDAE)
- mercurialis, Rissoa mercurialis R.B. Watson, 1886 - syn of: Iravadia delicata (R.A. Philippi, 1849) - (RISSOIDAE)
- Mercuriinae, Genus Mercuriinae Boeters & Falkner, 2017 (HYDROBIIDAE)
- mercurius, Streptotrochus mercurius J. Perner, 1907 † - (ELASMONEMATIDAE) (FOSSIL)
- Merdigera, Genus Merdigera F. Held, 1837 (ENIDAE)
- merdigera, Gemma merdigera (L. Pfeiffer, 1855) - (HELICINIDAE)
- Merdigerus, syn of: Genus Merdigera F. Held, 1837 (ENIDAE)
- merditana, Agathylla neutra merditana (A.J. Wagner, 1914) - (CLAUSILIIDAE)
- merditana scraparana, Agathylla merditana scraparana H. Nordsieck, 1996 - syn of: Agathylla neutra merditana (A.J. Wagner, 1914) - (CLAUSILIIDAE)
- merditanus, Napaeopsis merditanus (R. Sturany, 1907) - (ENIDAE)
- merditanus latifianus, Napaeopsis merditanus latifianus (R. Sturany, 1907) - (ENIDAE)
- merditanus winneguthi, Napaeopsis merditanus winneguthi (R. Sturany, 1907) - (ENIDAE)
- merditanus zebianus, Napaeopsis merditanus zebianus (R. Sturany, 1907) - (ENIDAE)
- merdueniana, Peristoma merdueniana I. Krynicki, 1833 - (ENIDAE)
- meredithae, Fusinus meredithae Tenison Woods, 1875 † - (FASCIOLARIIDAE) (FOSSIL)
- meredithi, Pleurobema meredithi I. Lea, 1858 - syn of: Fusconaia barnesiana (I. Lea, 1829) - (UNIONIDAE)
- meredithiae, Guraleus pictus meredithiae (J.E. Tenison-Woods, 1876) - (MANGELIIDAE)
- meredithii, Unio meredithii I. Lea, 1858 - syn of: Fusconaia barnesiana (I. Lea, 1829) - (UNIONIDAE)
- Merelina, Genus Merelina T. Iredale, 1915 (RISSOIDAE)
- merelina, Attenuata merelina (R.K. Dell, 1956) - (RISSOIDAE)
- Mereliniopsis, syn of: Genus Merelina T. Iredale, 1915 (RISSOIDAE)
- merelinoides, Onoba merelinoides H.W. Worsfold, G.J. Avern & W.F. Ponder, 1993 - (RISSOIDAE)
- merenda, Nassarius merenda A.A. Olsson, 1922 † - (NASSARIIDAE) (FOSSIL)
- merenskyi, Placenticeras merenskyi S.H. Haughton, 1930 † - syn of: Proplacenticeras stantoni A. Hyatt, 1903 † - (PLACENTICERATIDAE) (FOSSIL)
- merenskyi, Turritella merenskyi Bohm, 1926 † - (TURRITELLIDAE) (FOSSIL)
- meretriciformis, Mactra meretriciformis G.P. Deshayes, 1854 - syn of: Mactra abbreviata obesa L.A. Reeve, 1854 - (MACTRIDAE)
- meretriciformis, Mactra meretriciformis L.A. Reeve, 1854 - syn of: Mactra abbreviata J.B.P.A. Lamarck, 1818 - (MACTRIDAE)
- meretricula, Thais meretricula P.F. Röding, 1798 - syn of: Thais nodosa meretricula P.F. Röding, 1798 - (MURICIDAE)
- meretricula, Thais nodosa meretricula P.F. Röding, 1798 - (MURICIDAE)
- Meretrissa, Genus Meretrissa Jukes-Browne, 1908 † (CARDIIDA (UNASSIGNED)) (FOSSIL)
- Meretrix, Genus Meretrix J.B.P.A. Lamarck, 1799 (VENERIDAE)
- meretrix, Meretrix meretrix (C. Linnaeus, 1758) - (VENERIDAE)
- meretrix aurora, Meretrix meretrix aurora J. Hornell, 1917 - syn of: Meretrix aurora J. Hornell, 1917 - (VENERIDAE)
- meretrix bourdasi, Meretrix meretrix bourdasi E. Fischer-Piette & H. Fischer, 1941 - syn of: Meretrix attenuata R.W. Dunker, 1863 - (VENERIDAE)
- meretrix reevei, Meretrix meretrix reevei E. Fischer-Piette & H. Fischer, 1941 - syn of: Meretrix lamarckii G.P. Deshayes, 1853 - (VENERIDAE)
- merewetheri, Euomphaloceras merewetheri Cobban, Hook & J. Kennedy, 1989 † - (ACANTHOCERATIDAE) (FOSSIL)
- mergella, Valvata mergella C.A. Westerlund, 1883 - (VALVATIDAE)
- mergli, Peelerophon mergli Frýda, 1988 † - (TROPIDODISCIDAE) (FOSSIL)
- mergregia, Nassaria mergregia (L.A. Reeve, 1844) - (NASSARIIDAE)
- merguiensis, Cryptospira merguiensis L. Bozzetti, 2015 - (MARGINELLIDAE)
- merguina, Mauritia arabica merguina F.Jr. Lorenz & A. Hubert, 1993 - (CYPRAEIDAE)
- mergus, Tylonautilus mergus Shimanskiy, 1967 † - (GZHELOCERATIDAE) (FOSSIL)
- mergus, Chicoreus mergus E.H. Vokes, 1974 - (MURICIDAE)
- meriacum, Pleurotomella meriacum É.A.A. Locard, 1896 - (RAPHITOMIDAE)
- meriakrii, Paraoncidium meriakrii Stantschinsky, 1907 - syn of: Paraoncidium chameleon (J.W. Brazier, 1886) - (ONCHIDIIDAE)
- meriakrii, Oncidium meriakrii Stantschinsky, 1907 - syn of: Paraoncidium chameleon (J.W. Brazier, 1886) - (ONCHIDIIDAE)
- meriani, Acrioceras meriani (Ooster, 1860 †) - (ANCYLOCERATIDAE) (FOSSIL)
- meriani, Arcestes meriani Mojsisovics, 1875 † - syn of: Sphingites meriani (Mojsisovics, 1875 †) - (ARCESTIDAE) (FOSSIL)
- meriani, Paraspidoceras meriani (Oppel, 1863 †) - (ASPIDOCERATIDAE) (FOSSIL)
- meriani, Bakevelloides meriani (Stoppani, 1857 †) - (BAKEVELLIIDAE) (FOSSIL)
- meriani, Ceratites meriani (Klipstein, 1843 †) - (CERATITIDAE) (FOSSIL)
- meriani, Fedaiella meriani (R. Hoernes, 1856 †) - (FEDAIELLIDAE) (FOSSIL)
- meriani, Pinna meriani H. Winkler, 1859 † - (PINNIDAE) (FOSSIL)
- meriani, Sphingites meriani (Mojsisovics, 1875 †) - (SPHINGITIDAE) (FOSSIL)
- meriani dilatatum, Acrioceras meriani dilatatum Sarkar, 1955 † - (ANCYLOCERATIDAE) (FOSSIL)
- meriani musculosa, Bakevelloides meriani musculosa (Stoppani, 1893 †) - (BAKEVELLIIDAE) (FOSSIL)
- meriani tabarelliforme, Acrioceras meriani tabarelliforme Sarkar, 1955 † - (ANCYLOCERATIDAE) (FOSSIL)
- Merica, Genus Merica H. Adams & A. Adams, 1854 (CANCELLARIIDAE)
- Mericella, Genus Mericella K.H.J. Thiele, 1929 (CANCELLARIIDAE)
- mericiacum, Pleurotoma mericiacum É.A.A. Locard, 1897 - syn of: Benthomangelia antonia (W.H. Dall, 1881) - (TURRIDAE)
- Mericoceras, Genus Mericoceras Zhuravleva, 1978 † (MICHELINOCERATIDAE) (FOSSIL)
- merida, Cerithiopsis merida W.H. Dall, 1927 - (CERITHIOPSIDAE)
- meridaensis, Limnopomus meridaensis T. Pain, 1950 - syn of: Pomacea camena T. Pain, 1949 - (AMPULLARIIDAE)
- meridana, Streptostyla meridana (P.M.A. Morelet, 1849) - (SPIRAXIDAE)
- meridana cobanensis, Streptostyla meridana cobanensis (H.B. Tristram, 1861) - (SPIRAXIDAE)
- meridanus, Mesembrinus meridanus (L. Pfeiffer, 1846) - (BULIMULIDAE)
- meridensis, Lymnaea meridensis M.D. Bargues, P. Artigas & Mas-Coma, 2011 - (LYMNAEIDAE)
- meridiana, Strumosa strumosa meridiana H. Schütt, 2001 - (CLAUSILIIDAE)
- meridiana, Drillia meridiana I. Perugia & G. Prelle, 2012 - (DRILLIIDAE)
- meridiana, Meropesta meridiana T. Iredale, 1929 - syn of: Meropesta nicobarica (J.F. Gmelin, 1791) - (MACTRIDAE)
- meridiana, Eastonia meridiana T. Iredale, 1929 - syn of: Meropesta nicobarica (J.F. Gmelin, 1791) - (MACTRIDAE)
- meridiana, Archiminolia meridiana (R.K. Dell, 1953) - (SOLARIELLIDAE)
- meridiana, Eselaevitrigonia meridiana (Woods, 1917) † - (TRIGONIIDAE) (FOSSIL)
- meridianum, Neophylloceras meridianum Spath, 1953 † - (NEOPHYLLOCERATIDAE) (FOSSIL)
- meridianus, Malleus meridianus B.C. Cotton, 1930 - (MALLEIDAE)
- meridianus, Choanomphalus bathybius meridianus J. Beckmann & Y.I. Starobogatov, 1975 - (PLANORBIDAE)
- meridioamericana, Alvania meridioamericana N.E. Weisbord, 1962 - (RISSOIDAE)
- meridionale, Cunningtoniceras cunningtoni meridionale (F. Stoliczka, 1864 †) - (ACANTHOCERATIDAE) (FOSSIL)
- meridionale, Aricoceras meridionale (Teichert & E.M. Fletcher, 1943 †) - (ADRIANITIDAE) (FOSSIL)
- meridionale, Parancyloceras meridionale Avram & Melinte, 1998 † - (AEGOCRIOCERATIDAE) (FOSSIL)
- meridionale, Deroceras meridionale D. Reygrobellet, 1963 - syn of: Deroceras panormitanum M. Lessona & C. Pollonera, 1882 - (AGRIOLIMACIDAE)
- meridionale, Arctoceras meridionale Guex, 1978 † - (ARCTOCERATIDAE) (FOSSIL)
- meridionale, Buccinum meridionale T.A. Verkrüzen, 1884 - syn of: Buccinum undatum C. Linnaeus, 1758 - (BUCCINIDAE)
- meridionale, Fissidentalium meridionale H.A. Pilsbry & B. Sharp, 1897 - syn of: Fissidentalium candidum (J.G. Jeffreys, 1877) - (DENTALIIDAE)
- meridionale, Cyclostrema meridionale J.C. Melvill & R. Standen, 1912 - syn of: Munditia meridionalis (J.C. Melvill & R. Standen, 1912) - (LIOTIIDAE)
- meridionale, Paracenoceras meridionale Tinant, 1987 † - (PARACENOCERATIDAE) (FOSSIL)
- meridionale, Popanoceras meridionale Leonova 1989 † - (PARAPOPANOCERATIDAE) (FOSSIL)
- meridionale, Amussium meridionale E.A. Smith, 1885 - syn of: Propeamussium meridionale Smith, 1885 - (PECTINIDAE)
- meridionale, Ancylus meridionale J.R. Bourguignat, 1852 - syn of: Ancylus fluviatilis O.F. Müller, 1774 - (PLANORBIDAE)
- meridionale, Propeamussium meridionale Smith, 1885 - (PROPEAMUSSIIDAE)
- meridionale, Brookula meridionale (J.C. Melvill & R. Standen, 1912) - (SEGUENZIOIDEA (UNASSIGNED))
- meridionale, Maeneceras meridionale Frech, 1897 † - (SPORADOCERATIDAE) (FOSSIL)
- meridionale, Darkaoceras meridionale (Petter, 1959 †) - (TAOUZITIDAE) (FOSSIL)
- meridionale, Campeloma meridionale H.A. Pilsbry, 1916 - (VIVIPARIDAE)
- meridionale jamaicense, Fissidentalium meridionale jamaicense J. Henderson, 1920 - syn of: Fissidentalium candidum (J.G. Jeffreys, 1877) - (DENTALIIDAE)
- meridionale verrilli, Fissidentalium meridionale verrilli J. Henderson, 1920 - syn of: Fissidentalium candidum verrilli J. Henderson, 1920 - (DENTALIIDAE)
- meridionalis, Agoniatites meridionalis Bensaid, 1974 † - syn of: Meragoniatites meridionalis (Bensaid, 1974 †) - (AGONIATITIDAE) (FOSSIL)
- meridionalis, Aporrhais meridionalis B. de Basterot, 1825 † - (APORRHAIDAE) (FOSSIL)
- meridionalis, Yunnania meridionalis Mansuy, 1914 † - (ARAEONEMATIDAE) (FOSSIL)
- meridionalis, Pseudomalaxis zanclaeus meridionalis (C. Hedley, 1903) - (ARCHITECTONICIDAE)
- meridionalis, Arietites meridionalis (Reynes †) - (ARIETITIDAE) (FOSSIL)
- meridionalis, Astartella meridionalis A. Thomas, 1928 † - (ASTARTIDAE) (FOSSIL)
- meridionalis, Meragoniatites meridionalis (Bensaid, 1974 †) - (ATLANTOCERATIDAE) (FOSSIL)
- meridionalis, Barleeia meridionalis W.F. Ponder & H.W. Worsfold, 1994 - (BARLEEIIDAE)
- meridionalis, Bithynia meridionalis G.R. von Frauenfeld - syn of: Bithynia tentaculata (C. Linnaeus, 1758) - (BITHYNIIDAE)
- meridionalis, Glypteuthria meridionalis (E.A. Smith, 1881) - (BUCCINIDAE)
- meridionalis, Savatieria meridionalis (E.A. Smith, 1881) - (BUCCINIDAE)
- meridionalis, Neptunea meridionalis A.G. Smith, 1971 - (BUCCINIDAE)
- meridionalis, Buccinulum meridionalis E.A. Smith, 1881 - syn of: Glypteuthria meridionalis (E.A. Smith, 1881) - (BUCCINIDAE)
- meridionalis, Euthria meridionalis E.A. Smith, 1881 - syn of: Glypteuthria meridionalis (E.A. Smith, 1881) - (BUCCINIDAE)
- meridionalis, Lachesis meridionalis E.A. Smith, 1881 - syn of: Savatieria meridionalis (E.A. Smith, 1881) - (BUCCINIDAE)
- meridionalis, Bulimus meridionalis L.A. Reeve, 1848 - syn of: Peronaeus voithianus (L. Pfeiffer, 1847) - (BULIMULIDAE)
- meridionalis, Callistochiton meridionalis E.A. Ashby, 1919 - (CALLISTOPLACIDAE)
- meridionalis, Satsuma meridionalis (O.F. von Möllendorff, 1884) - (CAMAENIDAE)
- meridionalis, Cupedora meridionalis (G.P.L.K. Gude, 1903) - (CAMAENIDAE)
- meridionalis, Lippistes meridionalis J.C. Verco, 1906 - syn of: Separatista helicoides (J.F. Gmelin, 1791) - (CAPULIDAE)
- meridionalis, Miodontiscus meridionalis W.H. Dall, 1916 - syn of: Miodontiscus prolongatus (Carpenter, 1864) - (CARDITIDAE)
- meridionalis, Edouardia meridionalis M. Connolly, 1939 - (CERASTUIDAE)
- meridionalis, Edouardia meridionalis L. Pfeiffer, 1848 - syn of: Edouardia meridionalis M. Connolly, 1939 - (CERASTUIDAE)
- meridionalis, Granopupa meridionalis G.B. Adami, 1886 - syn of: Granopupa granum (J.P.R. Draparnaud, 1801) - (CHONDRINIDAE)
- meridionalis, Abida secale meridionalis A. Martínez-Ortí, B. Gómez & G. Faci, 2004 - (CHONDRINIDAE)
- meridionalis, Nannodiella meridionalis H.A. Pilsbry & A.A. Olsson, 1941 † - (CLATHURELLIDAE) (FOSSIL)
- meridionalis, Clathromangelia quadrillum meridionalis M.A. Peyrot, 1932 † - (CLATHURELLIDAE) (FOSSIL)
- meridionalis, Parabalea parcecostata meridionalis H. Nordsieck, 2010 - (CLAUSILIIDAE)
- meridionalis, Clione limacina meridionalis A. Pruvot-Fol, 1926 - (CLIONIDAE)
- meridionalis, Cocculina meridionalis C. Hedley, 1903 - syn of: Propilidium tasmanicum (H.A. Pilsbry, 1895) - (COCCULINIDAE)
- meridionalis, Cochlicella meridionalis A. Risso, 1826 - syn of: Cochlicella acuta (O.F. Müller, 1774) - (COCHLICELLIDAE)
- meridionalis, Cochlostoma auritum meridionalis (O. Böttger, 1886) - (COCHLOSTOMATIDAE)
- meridionalis, Amphissa meridionalis H.A. Pilsbry & A.A. Olsson, 1941 - (COLUMBELLIDAE)
- meridionalis, Crassatella meridionalis W.C. Mansfield, 1929 † - (CRASSATELLIDAE) (FOSSIL)
- meridionalis, Cuspidaria meridionalis (E.A. Smith, 1885) - (CUSPIDARIIDAE)
- meridionalis, Cylichnella meridionalis E.A. Smith, 1902 - (CYLICHNIDAE)
- meridionalis, Erosaria helvola meridionalis F.A. Schilder & M. Schilder, 1938 - (CYPRAEIDAE)
- meridionalis, Polymesoda meridionalis (T. Prime, 1865) - (CYRENIDAE)
- meridionalis, Corbicula meridionalis S. Clessin, 1879 - syn of: Corbicula fluminalis (O.F. Müller, 1774) - (CYRENIDAE)
- meridionalis, Naticopsis meridionalis B. Phillips, 1841 † - syn of: Macrochilina meridionalis (B. Phillips, 1841 †) - (DELPHINULOPSIDAE) (FOSSIL)
- meridionalis, Paracanthohoplites meridionalis Stoyanow, 1949 † - (DESHAYESITIDAE) (FOSSIL)
- meridionalis, Marinula meridionalis J.W. Brazier, 1872 - (ELLOBIIDAE)
- meridionalis, Ovatella meridionalis J.W. Brazier, 1877 - syn of: Myosotella myosotis (J.P.R. Draparnaud, 1801) - (ELLOBIIDAE)
- meridionalis, Heteroschismoides meridionalis V. Scarabino & C.H. Caetano, 2008 - (ENTALINIDAE)
- meridionalis, Sabinella meridionalis P. Bartsch, 1917 - (EULIMIDAE)
- meridionalis, Hesperaptyxis meridionalis Callomon & Snyder, 2017 † - (FASCIOLARIIDAE) (FOSSIL)
- meridionalis, Striatura meridionalis H.A. Pilsbry & J.H. Ferriss, 1906 - (GASTRODONTIDAE)
- meridionalis, Theba subdentata meridionalis C.F. Sacchi, 1955 - (HELICIDAE)
- meridionalis, Hiatella meridionalis (A.V.M.D. D'Orbigny, 1846) - (HIATELLIDAE)
- meridionalis, Mercuria meridionalis (A. Risso, 1826) - (HYDROBIIDAE)
- meridionalis, Cernuella meridionalis E.A. Rossmässler, 1837 - syn of: Cernuella virgata (E.M. Da Costa, 1778) - (HYGROMIIDAE)
- meridionalis, Ceratia meridionalis P. Lozouet, 2015 - (IRAVADIIDAE)
- meridionalis, Timanites meridionalis Petter, 1959 † - (KOENENITIDAE) (FOSSIL)
- meridionalis, Lima meridionalis J. Stuardo, 1968 - (LIMIDAE)
- meridionalis, Munditia meridionalis (J.C. Melvill & R. Standen, 1912) - (LIOTIIDAE)
- meridionalis, Radix meridionalis É.A.A. Locard, 1893 - syn of: Radix balthica (C. Linnaeus, 1758) - (LYMNAEIDAE)
- meridionalis, Raeta meridionalis R. Tate, 1889 - (MACTRIDAE)
- meridionalis, Demissa meridionalis F. Boyer, 2016 - (MARGINELLIDAE)
- meridionalis, Synartinskia meridionalis Leonova, 1985 † - (MEDLICOTTIIDAE) (FOSSIL)
- meridionalis, Montacuta meridionalis R. Tate, 1887 - (MONTACUTIDAE)
- meridionalis, Pterynopsis meridionalis P. Lozouet, 1999 † - (MURICIDAE) (FOSSIL)
- meridionalis, Choromytilus meridionalis (C.F.F. von Krauss, 1848) - (MYTILIDAE)
- meridionalis, Nacella meridionalis A. de Rochebrune & J.F. Mabille, 1885 - syn of: Nacella magellanica (J.F. Gmelin, 1791) - (NACELLIDAE)
- meridionalis, Natica meridionalis B. Phillips, 1841 † - syn of: Macrochilina meridionalis (B. Phillips, 1841 †) - (NATICIDAE) (FOSSIL)
- meridionalis, Natica varians meridionalis A.E.M. Cossmann & M.A. Peyrot, 1921 † - (NATICIDAE) (FOSSIL)
- meridionalis, Holcoptychites meridionalis Gerth, 1921 † - syn of: Holcoptychites magdalenae J.H.F. Douvillé, 1910 † - (NEOCOMITIDAE) (FOSSIL)
- meridionalis, Theodoxus meridionalis R.A. Philippi, 1836 - (NERITIDAE)
- meridionalis, Ommastrephes meridionalis A. Risso, 1854 - syn of: Ommastrephes bartramii (C.A. Lesueur, 1821) - (OMMASTREPHIDAE)
- meridionalis, Oreohelix strigosa meridionalis H.A. Pilsbry & J.H. Ferriss, 1919 - (OREOHELICIDAE)
- meridionalis, Oxychilus meridionalis M. Paulucci, 1881 - (OXYCHILIDAE)
- meridionalis, Patella meridionalis A. de Rochebrune & J.F. Mabille, 1885 - syn of: Nacella magellanica (J.F. Gmelin, 1791) - (PATELLIDAE)
- meridionalis, Pecten meridionalis R. Tate, 1887 - syn of: Pecten fumatus L.A. Reeve, 1852 - (PECTINIDAE)
- meridionalis, Philobrya meridionalis (E.A. Smith, 1885) - (PHILOBRYIDAE)
- meridionalis, Gyraulus meridionalis J.W. Brazier, 1875 - (PLANORBIDAE)
- meridionalis, Pleuromya meridionalis Dumortier, 1869 † - syn of: Pleuromya unioides (F.A. Roemer, 1835 †) - (PLEUROMYIDAE) (FOSSIL)
- meridionalis, Plicatula meridionalis R. Tate, 1887 - syn of: Pecten fumatus L.A. Reeve, 1852 - (PLICATULIDAE)
- meridionalis, Ashmunella meridionalis H.A. Pilsbry, 1948 - (POLYGYRIDAE)
- meridionalis, Notocrater meridionalis (C. Hedley, 1903) - (PSEUDOCOCCULINIDAE)
- meridionalis, Pupina meridionalis L. Pfeiffer, 1864 - (PUPINIDAE)
- meridionalis, Ringicula meridionalis C. Hedley, 1911 - (RINGICULIDAE)
- meridionalis, Macrochilina meridionalis (B. Phillips, 1841 †) - (SOLENISCIDAE) (FOSSIL)
- meridionalis, Eupera meridionalis (T. Prime, 1861) - (SPHAERIIDAE)
- meridionalis, Succinea meridionalis D'Orbigny, 1837 - (SUCCINEIDAE)
- meridionalis, Thracia meridionalis E.A. Smith, 1885 - (THRACIIDAE)
- meridionalis, Dolichupis meridionalis (C.N. Cate, 1979) - (TRIVIIDAE)
- meridionalis, Niveria meridionalis C.N. Cate, 1979 - syn of: Dolichupis meridionalis (C.N. Cate, 1979) - (TRIVIIDAE)
- meridionalis, Omalaxis meridionalis C. Hedley, 1903 - syn of: Pseudomalaxis zanclaeus meridionalis (C. Hedley, 1903) - (TURRITELLIDAE)
- meridionalis, Atoxonoides meridionalis (L. Forcart, 1967) - (UROCYCLIDAE)
- meridionalis, Chione meridionalis I.M. Oldroyd, 1921 - syn of: Chione compta (W.J. Broderip, 1835) - (VENERIDAE)
- meridionalis, Allaegopis meridionalis F. Riedel, 1986 - (ZONITIDAE)
- meridionalis pseudotransiens, Allaegopis meridionalis pseudotransiens F. Riedel, 1993 - (ZONITIDAE)
- meridionalis taurinensis, Aporrhais meridionalis taurinensis F. Sacco, 1893 † - (APORRHAIDAE) (FOSSIL)
- meridiopacifica, Onychoteuthis meridiopacifica P. Rancurel & T.A. Okutani, 1990 - (ONYCHOTEUTHIDAE)
- Meridiopyrgus, Genus Meridiopyrgus M. Haase, 2008 (TATEIDAE)
- Meridistes, Genus Meridistes Stanisic, 2010 (CAMAENIDAE)
- meridjensis, Maghrebiola meridjensis Kadolsky & Hammouda, 2017 † - (STROPHOCHEILIDAE) (FOSSIL)
- Meridolum, syn of: Genus Badistes A. Gould, 1862 (CAMAENIDAE)
- meridonalis, Leukoma meridonalis (Sowerby, 1846 †) - (VENERIDAE) (FOSSIL)
- meridonalis, Dosinia meridonalis H.F.A. von Ihering, 1897 † - (VENERIDAE) (FOSSIL)
- Meridosinia, syn of: Genus Dosinia J.A. Scopoli, 1777 (VENERIDAE)
- merignacense, Epitonium merignacense (M.E.A. de Boury, 1912 †) - (EPITONIIDAE) (FOSSIL)
- merignacensis, Pollia merignacensis M.A. Peyrot, 1924 † - (BUCCINIDAE) (FOSSIL)
- merignacensis, Capulus merignacensis A.E.M. Cossmann & M.A. Peyrot, 1921 † - (CAPULIDAE) (FOSSIL)
- merignacensis, Cerithiopsis merignacensis A.E.M. Cossmann & M.A. Peyrot, 1922 † - syn of: Metaxia merignacensis (A.E.M. Cossmann & M.A. Peyrot, 1922 †) - (CERITHIOPSIDAE) (FOSSIL)
- merignacensis, Actaeopyramis merignacensis A.E.M. Cossmann & M.A. Peyrot, 1917 † - syn of: Monotygma merignacensis (A.E.M. Cossmann & M.A. Peyrot, 1917 †) - (CIMIDAE) (FOSSIL)
- merignacensis, Blauneria merignacensis M.A. Peyrot, 1932 † - (ELLOBIIDAE) (FOSSIL)
- merignacensis, Ocinebrina excoelata merignacensis A.E.M. Cossmann & M.A. Peyrot, 1923 † - (MURICIDAE) (FOSSIL)
- merignacensis, Smaragdia merignacensis (A.E.M. Cossmann & M.A. Peyrot, 1917 †) - (NERITIDAE) (FOSSIL)
- merignacensis, Monotygma merignacensis (A.E.M. Cossmann & M.A. Peyrot, 1917 †) - (PYRAMIDELLIDAE) (FOSSIL)
- merignacensis, Williamia merignacensis (A.E.M. Cossmann & M.A. Peyrot, 1919 †) - (SIPHONARIIDAE) (FOSSIL)
- merignacensis, Metaxia merignacensis (A.E.M. Cossmann & M.A. Peyrot, 1922 †) - (TRIPHORIDAE) (FOSSIL)
- merignacensis, Chione dertoparva merignacensis A.E.M. Cossmann & M.A. Peyrot, 1909 † - (VENERIDAE) (FOSSIL)
- merignacensis crassicostulifera de, Spiniscala merignacensis crassicostulifera de M.E.A. de Boury, 1912 † - syn of: Epitonium merignacense (M.E.A. de Boury, 1912 †) - (EPITONIIDAE) (FOSSIL)
- merignacensis polycolpata, Spiniscala merignacensis polycolpata A.E.M. Cossmann, 1922 † - syn of: Epitonium merignacense (M.E.A. de Boury, 1912 †) - (EPITONIIDAE) (FOSSIL)
- Merignacia, Genus Merignacia Cossmann, 1915 † (MONTACUTIDAE) (FOSSIL)
- merijni, Abida secale merijni B. Kokshoorn & E. Gittenberger, 2010 - (CHONDRINIDAE)
- merijni, Clio merijni Janssen, 2012 † - (CLIIDAE) (FOSSIL)
- merilla, Acar merilla A. De Gregorio, 1884 - syn of: Acar clathrata (J.L.M. Defrance, 1816) - (ARCIDAE)
- merimeana, Cecilioides merimeana J.R. Bourguignat, 1869 - syn of: Cecilioides acicula (O.F. Müller, 1774) - (FERUSSACIIDAE)
- merimei, Cecilioides merimei E. Caziot, 1910 - syn of: Cecilioides acicula (O.F. Müller, 1774) - (FERUSSACIIDAE)
- merino, Latouchella merino Runnegar & Jell, 1976 † - syn of: Dorispira merino (Runnegar & Jell, 1976 †) - (COREOSPIRIDAE) (FOSSIL)
- merino, Dorispira merino (Runnegar & Jell, 1976 †) - (RUGAECONIDAE) (FOSSIL)
- merino, Trenella merino Runnegar & Jell, 1976 † - syn of: Dorispira merino (Runnegar & Jell, 1976 †) - (TRENELLIDAE) (FOSSIL)
- Merisca, Subgenus Arcopagia (Merisca) W.H. Dall, 1900 (TELLINIDAE)
- Merismoconcha, Genus Merismoconcha Yü, 1979 † (MOLLUSCA INCERTAE SEDIS) (FOSSIL)
- Merismopteria, Genus Merismopteria Etheridge, 1892 † (PTERIIDA (UNASSIGNED)) (FOSSIL)
- merista, Calliobasis merista B.A. Marshall, 1991 - (SEGUENZIIDAE)
- meristotrochus, Geotrochus meristotrochus J.J. Vermeulen, M. Schilthuizen & T.S. Liew MS - (HELICARIONIDAE)
- merita, Cymbularia merita Reed, 1921 † - (BELLEROPHONTIDAE) (FOSSIL)
- merita, Mitrella merita (J.W. Brazier, 1877) - (COLUMBELLIDAE)
- merita, Hemicycla merita (A. Mousson, 1872) - (HELICIDAE)
- merita, Tenaturris merita (R.B. Hinds, 1843) - (MANGELIIDAE)
- meritriciformis, Mactra abbreviata meritriciformis L.A. Reeve, 1854 - (MACTRIDAE)
- merkana, Petaloconchus merkana H.S. Ladd, 1972 - (VERMETIDAE)
- merklini, Swiftopecten merklini V.N. Sinelnikova, 1975 † - (PECTINIDAE) (FOSSIL)
- merklini, Gari merklini V.N. Sinelnikova, 1990 † - (PSAMMOBIIDAE) (FOSSIL)
- Merklinia, Genus Merklinia Sobetzky, 1960 † (PECTINIDAE) (FOSSIL)
- Merklinicardium, Genus Merklinicardium Popov in Popov & Titova, 1982 † (CARDIIDA (UNASSIGNED)) (FOSSIL)
- merlai, Furloceras merlai (Pelosio, 1968 †) - (PHYMATOCERATIDAE) (FOSSIL)
- Merlaites, syn of: Genus Brodieia Buckman, 1899 † (PHYMATOCERATIDAE) (FOSSIL)
- merlei, Colubratriton merlei J.M. Pacaud, Ledon & Loubry, 2015 † - (CANCELLARIIDAE) (FOSSIL)
- merlei, Luponovula merlei L. Dolin & Ledon, 2002 † - (EOCYPRAEIDAE) (FOSSIL)
- merlei, Heliconoides merlei Cahuzac & Janssen, 2010 † - (LIMACINIDAE) (FOSSIL)
- merlei, Murexsul merlei R. Houart & V. Héros, 2008 - (MURICIDAE)
- merlei, Nassarius merlei F. Van Dingenen, L. Ceulemans & al., 2015 † - (NASSARIIDAE) (FOSSIL)
- merlei, Terebellopsis merlei J.M. Pacaud & Leroy, 2006 † - (ROSTELLARIIDAE) (FOSSIL)
- merleti, Conus merleti S. Mayissian, 1974 - syn of: Fulgiconus moluccensis (H.C. Küster, 1838) - (CONIDAE)
- merlini, Agathotoma merlini (P. Dautzenberg, 1910) - (MANGELIIDAE)
- merlini, Mangelia merlini P. Dautzenberg, 1910 - syn of: Agathotoma merlini (P. Dautzenberg, 1910) - (MANGELIIDAE)
- merlini, Trivia merlini D. Fehse & Van de Haar, 2015 - (TRIVIIDAE)
- merlini concolor, Agathotoma merlini concolor P. Dautzenberg, 1910 - (MANGELIIDAE)
- mermeroglaphyra, Turbonilla mermeroglaphyra R.S. Absalão, F.N. Dos Santos & D. de Oliveira Tenório, 2003 - (PYRAMIDELLIDAE)
- mermeti, Angulithes mermeti (P.D. Montfort, 1802 †) - (HERCOGLOSSIDAE) (FOSSIL)
- mermeti, Lissoniceras mermeti P.D. Montfort, 1802 † - syn of: Angulithes mermeti (P.D. Montfort, 1802 †) - (HERCOGLOSSIDAE) (FOSSIL)
- mermosi, Cyclotopsis mermosi (E. Fischer-Piette, Ch.P. Blanc, F. Blanc & F. Salvat, 1993) - (POMATIIDAE)
- mermuysi, Heliconoides mermuysi Cahuzac & Janssen, 2010 † - (LIMACINIDAE) (FOSSIL)
- mernoo, Condylocuna mernoo (R.K. Dell, 1952) - (CONDYLOCARDIIDAE)
- mernoo, Octopus mernoo B.J. O'Shea, 1999 - (OCTOPODIDAE)
- mero, Opisthoteuthis mero B.J. O'Shea, 1999 - (OPISTHOTEUTHIDAE)
- meroaeformis, Tapes meroaeformis G.B. II Sowerby, 1853 - syn of: Paphia crassisulca (J.B.P.A. Lamarck, 1818) - (VENERIDAE)
- Merocanites, Genus Merocanites Schindewolf , 1922 † (PROLECANITIDAE) (FOSSIL)
- meroclista, Cupolaconcha meroclista (J.A. Hadfield & E.A. Kay, 1972) - (VERMETIDAE)
- Merocycloceras, Genus Merocycloceras Ristedt , 1968 † (ORTHOCERATIDAE) (FOSSIL)
- merodabensis, Unio merodabensis H.C. Küster, 1861 - syn of: Parreysia corrugata (O.F. Müller, 1774) - (UNIONIDAE)
- meroe, Sunetta meroe (C. Linnaeus, 1758) - (VENERIDAE)
- meroe, Venus meroe C. Linnaeus, 1758 - syn of: Sunetta meroe (C. Linnaeus, 1758) - (VENERIDAE)
- Meroe, syn of: Genus Sunetta J.H.F. Link, 1807 (VENERIDAE)
- Meroena, Genus Meroena Jukes-Browne, 1908 † (VENERIDAE) (FOSSIL)
- meroensis, Scapharca meroensis A.A. Olsson, 1931 † - (ARCIDAE) (FOSSIL)
- meroensis, Chorus meroensis A.A. Olsson, 1931 † - (MURICIDAE) (FOSSIL)
- meroensis, Macoma meroensis A.A. Olsson, 1931 † - (TELLINIDAE) (FOSSIL)
- meroensis, Turritella meroensis A.A. Olsson, 1931 † - (TURRITELLIDAE) (FOSSIL)
- meroeum, Lepton meroeum P.P. Carpenter, 1864 - syn of: Kellia suborbicularis (G. Montagu, 1803) - (LASAEIDAE)
- meroglypta, Cataegis meroglypta J.H. McLean & J.F. Quinn, 1987 - (CATAEGIDAE)
- Meromenia, Genus Meromenia E.H.J. Leloup, 1949 (AMPHIMENIIDAE)
- meroniana, Telophaedusa meroniana (P.M. Heude, 1888) - (CLAUSILIIDAE)
- Merope, syn of: Genus Papuina E.C. Von Martens, 1860 (CAMAENIDAE)
- Merope, syn of: Genus Meropesta T. Iredale, 1929 (MACTRIDAE)
- merope, Fulgurofusus merope (F.M. Bayer, 1971) - (TURBINELLIDAE)
- merope, Peristarium merope F.M. Bayer, 1971 - syn of: Fulgurofusus merope (F.M. Bayer, 1971) - (TURBINELLIDAE)
- Meropella, Genus Meropella Meropella † (MELAGATHICERATIDAE) (FOSSIL)
- Meropesta, Genus Meropesta T. Iredale, 1929 (MACTRIDAE)
- Meropharciceras, Genus Meropharciceras Becker & House, 1993 † (PHARCICERATIDAE) (FOSSIL)
- meropsis, Tellina meropsis (W.H. Dall, 1900) - (TELLINIDAE)
- meropsis, Moerella meropsis W.H. Dall, 1900 - syn of: Tellina meropsis (W.H. Dall, 1900) - (TELLINIDAE)
- Merovia, syn of: Genus Granulina F.P. Jousseaume, 1888 (MARGINELLIDAE)
- merramecensis, Titanoplina merramecensis Stinchcomb & Angeli, 2002 † - (PROPLINIDAE) (FOSSIL)
- merria, Discodoris merria R.F. Burn, 1973 - syn of: Aporodoris merria (R.F. Burn, 1973) - (DISCODORIDIDAE)
- merria, Aporodoris merria (R.F. Burn, 1973) - (DORIDIDAE)
- Merria, syn of: Genus Vanikoro J.R.C. Quoy & J.P. Gaimard, 1832 (VANIKORIDAE)
- Merriamella, Genus Merriamella Blodgett & Johnson, 1992 † (PTEROTHECIDAE) (FOSSIL)
- merriami, Thairoplax merriami Hoare, 2000 † - (ALASTEGIIDAE) (FOSSIL)
- merriami, Angulararca merriami (Van Winkjel 1918) † - (ARCIDAE) (FOSSIL)
- merriami, Borsonella merriami (R. Arnold, 1903) - (BORSONIIDAE)
- merriami, Nevadites merriami Smith, 1914 † - syn of: Nevadites hyatti (Smith, 1904 †) - (CERATITIDAE) (FOSSIL)
- merriami, Californites merriami A. Hyatt & Smith, 1905 † - (CLIONITITIDAE) (FOSSIL)
- merriami, Crassatella merriami C.S. Weaver, 1916 † - (CRASSATELLIDAE) (FOSSIL)
- merriami, Cravenoceras merriami Youngquist, 1949 † - syn of: Stenoglaphyrites merriami (Youngquist, 1949 †) - (CRAVENOCERATIDAE) (FOSSIL)
- merriami, Siphocypraea merriami W.M. Ingram, 1939 † - (CYPRAEIDAE) (FOSSIL)
- merriami, Drillia merriami R. Arnold, 1903 † - syn of: Borsonella merriami (R. Arnold, 1903) - (DRILLIIDAE) (FOSSIL)
- merriami, Hercoglossa merriami R.E. Dickerson, 1914 † - (HERCOGLOSSIDAE) (FOSSIL)
- merriami, Pyrgulopsis merriami H.A. Pilsbry & C.E. Beecher, 1892 - (HYDROBIIDAE)
- merriami, Fluminicola merriami (H.A. Pilsbry & C.E. Beecher, 1892) - (LITHOGLYPHIDAE)
- merriami, Groenlandites merriami Bucher, 1989 † - (LONGOBARDITIDAE) (FOSSIL)
- merriami, Mactromeris merriami A. Packard, 1916 † - (MACTRIDAE) (FOSSIL)
- merriami, Somoholites merriami Miller & Furnish, 1940 † - (SOMOHOLITIDAE) (FOSSIL)
- merriami, Stenoglaphyrites merriami (Youngquist, 1949 †) - (STENOGLAPHYRITIDAE) (FOSSIL)
- merriami longifrons, Mactromeris merriami longifrons H. Turner, 1938 † - (MACTRIDAE) (FOSSIL)
- Merriamites, Genus Merriamites Blodgett & Johnson, 1995 † (PTEROTHECIDAE) (FOSSIL)
- merrilli, Thala merrilli G. Rosenberg & R. Salisbury, 2014 - (COSTELLARIIDAE)
- merrilli, Herpeteros merrilli (P. Bartsch, 1904) - (HELMINTHOGLYPTIDAE)
- merrilli, Neocyclotus merrilli (P. Bartsch & J.P.E. Morrison, 1942) - (NEOCYCLOTIDAE)
- merrilli, Anawasatchites merrilli McLearn, 1945 † - (PRIONITIDAE) (FOSSIL)
- Merrilliana, Subgenus Geomelania (Merrilliana) W.J. Clench & H. Turner, 1948 (TRUNCATELLIDAE)
- mersa, Dirutrachia mersa T. Iredale, 1937 - (CAMAENIDAE)
- mersa, Eulimella mersa A. Peñas & E. Rolán, 2016 - (PYRAMIDELLIDAE)
- mersai, Loxonema mersai E.A.L. Kittl, 1894 † - (LOXONEMATIDAE) (FOSSIL)
- merschardti, Kalidos merschardti E. Fischer-Piette, F. Blanc & F. Salvat, 1975 - (ARIOPHANTIDAE)
- mersinae, Helix mersinae W. Kobelt, 1896 - (HELICIDAE)
- merssinae, Monacha merssinae A. Mousson, 1874 - (HYGROMIIDAE)
- mersus, Austropyrgus mersus A. Clark, W.B. Miller & W.F. Ponder, 2003 - (HYDROBIIDAE)
- merteni, Eutrephoceras merteni Wiedmann, 1960 † - (NAUTILIDAE) (FOSSIL)
- mertensii, Lepidozona mertensii (A.T. von Middendorff, 1847) - (ISCHNOCHITONIDAE)
- mertoni, Tucetona mertoni C.R. Böttger, 1918 - syn of: Glycymeris tenuicostata (L.A. Reeve, 1843) - (GLYCYMERIDIDAE)
- mertoni, Glycymeris mertoni C.R. Böttger, 1918 - syn of: Glycymeris tenuicostata (L.A. Reeve, 1843) - (GLYCYMERIDIDAE)
- mertoni, Juvavites mertoni McLearn, 1937 † - syn of: Malayites bococki McLearn, 1937 † - (JUVAVITIDAE) (FOSSIL)
- mertoni, Onchidium mertoni H.R. Simroth, 1918 - (ONCHIDIIDAE)
- mertonyarwoodi, Lilloettia mertonyarwoodi Crickmay, 1930 † - (SPHAEROCERATIDAE) (FOSSIL)
- meruensis, Halolimnohelix meruensis (A. d'Ailly, 1911) - (HALOLIMNOHELICIDAE)
- meruensis, Chlamydarion meruensis A. d'Ailly, 1911 - syn of: Halolimnohelix meruensis (A. d'Ailly, 1911) - (UROCYCLIDAE)
- meruensis, Bloyetia simulans meruensis K.L. Pfeiffer, 1952 - (UROCYCLIDAE)
- merula, Pusia merula G.B. III Sowerby, 1889 - syn of: Vexillum patulum merula G.B. III Sowerby, 1889 - (COSTELLARIIDAE)
- merula, Vexillum patulum merula G.B. III Sowerby, 1889 - (COSTELLARIIDAE)
- merula, Oxystele merula (L.W. Dillwyn, 1817) - (TROCHIDAE)
- merultum, Adelacerithium merultum N.H. Ludbrook, 1941 - (NEWTONIELLIDAE)
- merus, Angulus merus T. Say, 1834 - (TELLINIDAE)
- merus, Unio merus I. Lea, 1852 - syn of: Fusconaia masoni (T.A. Conrad, 1834) - (UNIONIDAE)
- mervcooperi, Livonia mervcooperi P. Bail & A. Limpus, 2010 - (VOLUTIDAE)
- merveae, Stenosemus merveae B.I. Sirenko, 2016 - (ISCHNOCHITONIDAE)
- Mervia, syn of: Genus Granulina F.P. Jousseaume, 1888 (MARGINELLIDAE)
- merwinii, Littorina merwinii R.A. Philippi, 1846 - syn of: Littorina compressa J.G. Jeffreys, 1865 - (LITTORINIDAE)
- meryenorfi, Hormotoma meryenorfi E.F.R.K. Koken, 1897 † - (MURCHISONIIDAE) (FOSSIL)
- Meryticola, Subgenus Celticola (Meryticola) C.M. Cooke & Y. Kondo, 1960 (ACHATINELLIDAE)
- merzbacheri, Buliminus merzbacheri E. Weber, 1913 - syn of: Pseudonapaeus leucoptychus (C.M.F. Ancey, 1886) - (ENIDAE)
- merziana, Trochomorpha merziana L. Pfeiffer, 1852 - (TROCHOMORPHIDAE)
- merzianoides, Trochomorpha merzianoides A. Garrett - (TROCHOMORPHIDAE)
- Merzougites, Genus Merzougites Klug, 2002 † (BELOCERATIDAE) (FOSSIL)
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