- moodiense, Teinostoma moodiense † - (TORNIDAE) (FOSSIL)
- moohuensis, Tornatellinops moohuensis (H.B. Preston, 1913) - (ACHATINELLIDAE)
- mooiensis, Ancylastrum mooiensis B. Walker, 1912 - (PLANORBIDAE)
- moolae, Fluviopupa moolae S. Zielske & M. Haase, 2014 - (HYDROBIIDAE)
- moolenbeeki, Mazatlania moolenbeeki U. Aubry, 1995 - syn of: Mazatlania fulgurata (R.A. Philippi, 1846) - (COLUMBELLIDAE)
- moolenbeeki, Graphiconus moolenbeeki R.M. Filmer, 2011 - (CONIDAE)
- moolenbeeki, Epitonium moolenbeeki J.J. Van Aartsen, 1996 - (EPITONIIDAE)
- moolenbeeki, Rahula moolenbeeki W.J.M. Maassen, 2000 - (HELICARIONIDAE)
- moolenbeeki, Hyalina moolenbeeki J. Espinosa & J.A. Ortea, 2012 - (MARGINELLIDAE)
- moolenbeeki, Nassarius moolenbeeki H.H. Kool, 1995 - (NASSARIIDAE)
- moolenbeeki, Neolepton moolenbeeki J. van der Linden, 2003 - (NEOLEPTONIDAE)
- moolenbeeki, Chrysallida moolenbeeki B. Amati, 1987 - (PYRAMIDELLIDAE)
- moolenbeeki, Folinella moolenbeeki J.J. Van Aartsen, E. Gittenberger & J. Goud, 1998 - (PYRAMIDELLIDAE)
- moolenbeeki, Alvania moolenbeeki D. De Jong & H.E. Coomans, 1988 - (RISSOIDAE)
- moolenbeeki, Lopheliella moolenbeeki L. Hoffman, B. van Heugten & M.S.S. Lavaleye, 2008 - (SKENEIDAE)
- moolenbeeki, Haplocochlias moolenbeeki D. De Jong & H.E. Coomans, 1988 - (SKENEIDAE)
- moolenbeeki, Solen moolenbeeki N.N. Thach, 2014 - (SOLENIDAE)
- moolenbeeki, Discartemon moolenbeeki Maasen, 2016 - (STREPTAXIDAE)
- moolenbeeki, Terebra moolenbeeki U. Aubry, 1995 - syn of: Mazatlania fulgurata (R.A. Philippi, 1846) - (TEREBRIDAE)
- moolenbeeki, Turbo moolenbeeki Dekkers & Dekker, 2016 - (TURBINIDAE)
- moolenbeeki, Diplodonta moolenbeeki J.J. Van Aartsen & J. Goud, 2006 - syn of: Transkeia satparaensis (H.B. Preston, 1915) - (UNGULINIDAE)
- moolenbeeki, Zebina moolenbeeki Faber & Gori, 2016 - (ZEBINIDAE)
- moomiensis, Amastra humilis moomiensis H.A. Pilsbry & C.M. Cooke, 1914 - (AMASTRIDAE)
- Moominia, Genus Moominia J. Gerlach, 2003 (HYDROBIIDAE)
- moomomiensis, Tornatellides moomomiensis H.A. Pilsbry & C.M. Cooke, 1915 - (ACHATINELLIDAE)
- moomomiensis, Pleuropoma laciniosa moomomiensis M.C. Neal, 1934 - (HELICINIDAE)
- moomomiensis, Lyropupa ovatula moomomiensis H.A. Pilsbry & C.M. Cooke, 1926 - (VERTIGINIDAE)
- mooraboolensis, Mytilus mooraboolensis G.B. Pritchard, 1903 † - (MYTILIDAE) (FOSSIL)
- moorae, Ciliatocardium moorae A.I. Kafanov, 2002 † - (CARDIIDAE) (FOSSIL)
- mooreae, Anthracoceras mooreae D.R. Currie, 1954 † - (ANTHRACOCERATIDAE) (FOSSIL)
- mooreae, Properrinites mooreae Miller & Furnish, 1940 † - (PERRINITIDAE) (FOSSIL)
- mooreana, Venericardia mooreana T.A. Conrad, 1867 † - syn of: Venericor densata pendletonensis (Gardner & E. Bowles, 1939 †) - (CARDITIDAE) (FOSSIL)
- mooreana, Weedingia mooreana P. Kaas, 1988 - (HEMIARTHRIDAE)
- mooreana, Americoliva mooreana (E.J. Petuch, 2013) - (OLIVIDAE)
- mooreana, Partula mooreana W.D. Hartman, 1880 - (PARTULIDAE)
- mooreana, Millerelix mooreana (W.G. Binney, 1858) - (POLYGYRIDAE)
- mooreana, Eurytellina mooreana (W.M. Gabb, 1860 †) - (TELLINIDAE) (FOSSIL)
- mooreana, Nesopupa mooreana (E.A. Smith, 1894) - (VERTIGINIDAE)
- mooreanus, Rabdotus dealbatus mooreanus (L. Pfeiffer, 1868) - (BULIMULIDAE)
- mooreanus, Solariorbis mooreanus E.G. Vanatta, 1904 - (TORNIDAE)
- Moorefieldoceras, Genus Moorefieldoceras Niko & Mapes, 2015 † (PSEUDORTHOCERATIDAE) (FOSSIL)
- moorei, Acteonina moorei A. Nützel & Kiessling, 1997 † - (ACTEONINIDAE) (FOSSIL)
- moorei, Aviculopecten moorei Newell, 1938 † - (AVICULOPECTINIDAE) (FOSSIL)
- moorei, Caecum moorei L.N. Marincovich, 1973 - (CAECIDAE)
- moorei, Bivetopsia moorei (R.J.L. Guppy, 1866 †) - (CANCELLARIIDAE) (FOSSIL)
- moorei, Paradimorphoceras moorei F. Hodson, 1954 † - (DIMORPHOCERATIDAE) (FOSSIL)
- moorei, Stenodomatoceras moorei (A.K. Miller, J.H. Lane & A.G. Unklesbay, 1932 †) - (DOMATOCERATIDAE) (FOSSIL)
- moorei, Leptadrillia moorei P.J. Fallon, 2016 - (DRILLIIDAE)
- moorei, Latirus moorei W.M. Gabb, 1860 † - (FASCIOLARIIDAE) (FOSSIL)
- moorei, Glaphyrites moorei Miller & Owen, 1939 † - (GLAPHYRITIDAE) (FOSSIL)
- moorei, Schizolopha moorei Ulrich & Scofield, 1897 † - syn of: Paupospira moorei (Ulrich & Scofield, 1897 †) - (GOSSELETINIDAE) (FOSSIL)
- moorei, Domatoceras moorei A.K. Miller, J.H. Lane & A.G. Unklesbay, 1932 † - syn of: Stenodomatoceras moorei (A.K. Miller, J.H. Lane & A.G. Unklesbay, 1932 †) - (GRYPOCERATIDAE) (FOSSIL)
- moorei, Dumortieria moorei (J. Lycett, 1857 †) - (HILDOCERATIDAE) (FOSSIL)
- moorei, Glottoceras moorei Knechtel, 1947 † - (KNEMICERATIDAE) (FOSSIL)
- moorei, Kuskokwimia moorei Frýda & Blodgett, 2001 † - (KUSKOKWIMIIDAE) (FOSSIL)
- moorei, Paupospira moorei (Ulrich & Scofield, 1897 †) - (LOPHOSPIRIDAE) (FOSSIL)
- moorei, Antillophos moorei (R.J.L. Guppy, 1866 †) - (NASSARIIDAE) (FOSSIL)
- moorei, Nucula moorei R. Winckworth, 1931 - syn of: Nucula nitidosa R. Winckworth, 1930 - (NUCULIDAE)
- moorei, Olivella moorei R.T. Abbott, 1951 - (OLIVELLIDAE)
- moorei, Pseudozygopleura moorei Knight, 1930 † - (PSEUDOZYGOPLEURIDAE) (FOSSIL)
- moorei, Scabrotrigonia eufaulensis moorei (L.W. Stephenson, 1941 †) - (PTEROTRIGONIIDAE) (FOSSIL)
- moorei, Turbonilla moorei C.R. Laws, 1937 - (PYRAMIDELLIDAE)
- moorei, Bendoceras moorei Plummer & P.H. Scott, 1937 † - syn of: Eowellerites moorei (Plummer & P.H. Scott, 1937 †) - (SCHISTOCERATIDAE) (FOSSIL)
- moorei, Coxitrigonia moorei (Lycett, 1870) † - (TRIGONIIDAE) (FOSSIL)
- moorei, Trochus moorei McCoy † - (TROCHIDAE) (FOSSIL)
- moorei, Turbo moorei B.W. Hayward, 1981 † - (TURBINIDAE) (FOSSIL)
- moorei, Eosurcula moorei (W.M. Gabb, 1860 †) - (TURRIDAE) (FOSSIL)
- moorei, Vidrioceras moorei Plummer & P.H. Scott, 1937 † - (VIDRIOCERATIDAE) (FOSSIL)
- moorei, Eowellerites moorei (Plummer & P.H. Scott, 1937 †) - (WELLERITIDAE) (FOSSIL)
- moorei costaricensis, Antillophos moorei costaricensis (A.A. Olsson, 1922 †) - (NASSARIIDAE) (FOSSIL)
- moorei pachia, Bivetopsia moorei pachia M. Smith, 1940 - (CANCELLARIIDAE)
- Mooreoceras, Genus Mooreoceras Miller & al., 1933 † (PSEUDORTHOCERATIDAE) (FOSSIL)
- mooreorum, Carinapex mooreorum S.G. Wiedrick, 2015 - (HORAICLAVIDAE)
- mooresi, Schizodus mooresi Miller, 1889 † - syn of: Schizodus amplus F.B. Meek & A.H. Worthen, 1870 † - (SCHIZODIDAE) (FOSSIL)
- mooretownensis, Alencasterites mooretownensis (C.T. Trechmann, 1924 †) - (RADIOLITIDAE) (FOSSIL)
- moorundianum, Meracomelon moorundianum T. Iredale, 1937 - syn of: Cupedora cassandra (L. Pfeiffer, 1864) - (CAMAENIDAE)
- moosai, Gemmuloborsonia moosai A.V. Sysoev & P. Bouchet, 1996 - (CLAVATULIDAE)
- moosai, Nassaria moosai K. Fraussen, 2006 - (NASSARIIDAE)
- moosbrunnensis, Theodoxus moosbrunnensis Papp, 1953 † - (NERITIDAE) (FOSSIL)
- moosleitneri, Costatomphalus moosleitneri J. Gründel & H.A. Kollmann, 2012 † - (LIOTIIDAE) (FOSSIL)
- Mopalia, Genus Mopalia J.E. Gray, 1847 (MOPALIIDAE)
- Mopaliella, Genus Mopaliella K.H.J. Thiele, 1909 (MOPALIIDAE)
- MOPALIIDAE Dall, 1889 - Family (POLYPLACOPHORA-NEOLORICATA [Subclass]-CHITONIDA [Order]-ACANTHOCHITONINA [Suborder]-MOPALIOIDEA [Superfamily])
- Mopaliopsis, syn of: Genus Lepidochitona J.E. Gray, 1821 (LEPIDOCHITONIDAE)
- mopsicolor, Lamellaria mopsicolor Er. Marcus, 1958 - (VELUTINIDAE)
- mopsus, Philoxene mopsus (J.W. Hall, 1868 †) - (EUOMPHALIDAE) (FOSSIL)
- moquiana, Turricaspia moquiana † - (HYDROBIIDAE) (FOSSIL)
- moquicus, Viviparus abchasicus moquicus Taboyakova, 1964 † - (VIVIPARIDAE) (FOSSIL)
- moquiensis, Tylopoma moquiensis V.V. Anistratenko, 1993 † - (BITHYNIIDAE) (FOSSIL)
- moquini, Galba moquini É.A.A. Locard, 1893 - syn of: Galba truncatula (O.F. Müller, 1774) - (LYMNAEIDAE)
- moquini, Parmacella moquini J.R. Bourguignat, 1850 - syn of: Parmacella valenciennii P.B. Webb & P.J. Van Beneden, 1836 - (PARMACELLIDAE)
- moquini, Planorbis moquini E. Réquien, 1848 - (PLANORBIDAE)
- moquini, Paludina moquini Roumeguere, 1858 - syn of: Viviparus listeri (E. Forbes & S.C.T. Hanley, 1849) - (VIVIPARIDAE)
- moquiniana, Chondrina moquiniana H.C. Küster, 1843 - syn of: Chondrina bigorriensis C. des Moulins, 1835 - (CHONDRINIDAE)
- moquiniana, Palaeohelicina moquiniana (C.A. Récluz, 1851) - (HELICINIDAE)
- moquiniana, Islamia moquiniana (D. Dupuy, 1851) - (HYDROBIIDAE)
- moquiniana, Natica moquiniana C.A. Récluz, 1853 - (NATICIDAE)
- moquiniana, Eupera moquiniana J.R. Bourguignat, 1854 - syn of: Eupera bahiensis (J.B. von Spix, 1827) - (SPHAERIIDAE)
- moquiniana, Pleurotoma moquiniana R.P. Montrouzier, 1874 - syn of: Clavus moquinianus (R.P. Montrouzier, 1874) - (TURRIDAE)
- moquinianus, Clavus moquinianus (R.P. Montrouzier, 1874) - (DRILLIIDAE)
- moquinianus, Napaeus moquinianus (Webb & Berthelot, 1833) - (ENIDAE)
- moquinianus, Fusinus moquinianus J.P.S. Grateloup, 1840 † - (FASCIOLARIIDAE) (FOSSIL)
- moquinianus, Murex moquinianus A. Duval, 1853 - syn of: Hexaplex megacerus (G.B. II Sowerby, 1834) - (MURICIDAE)
- moquinianus, Unio moquinianus D. Dupuy, 1843 - syn of: Unio mancus J.B.P.A. Lamarck, 1819 - (UNIONIDAE)
- mora, Pleurodonte mora J.E. Gray in E. Griffith, 1834 - (PLEURODONTIDAE)
- moradi, Pachycrommium moradi Awad & Abed, 1967 † - (AMPULLINIDAE) (FOSSIL)
- moragai, Tejonia moragai (C.C. Stewart, 1927 †) - (NATICIDAE) (FOSSIL)
- moraguesi, Rupestrella philippii moraguesi (W. Kobelt, 1886) - (CHONDRINIDAE)
- moraguesi, Amandana moraguesi (W. Kobelt, 1883) - (HYGROMIIDAE)
- morahensis, Aviculopecten morahensis L. Waagen, 1881 † - (AVICULOPECTINIDAE) (FOSSIL)
- moraisi, Cheloniceras moraisi F. Da Silva, 1962 † - syn of: Cheloniceras neivai F. Da Silva, 1962 † - (DOUVILLEICERATIDAE) (FOSSIL)
- moralesi, Cerion torrei moralesi W.J. Clench & C.G. Aguayo, 1951 - (CERIONIDAE)
- moralesi, Chondropoma moralesi C. de la Torre & P. Bartsch, 1938 - syn of: Chondropoma moestum moralesi (C. de la Torre & P. Bartsch, 1938) - (POMATIIDAE)
- moralesi, Chondropoma moestum moralesi (C. de la Torre & P. Bartsch, 1938) - (POMATIIDAE)
- moralesi, Pfeiffericoptis moralesi (J. Gundlach in R. Arango, 1876) - (UROCOPTIDAE)
- morambrae, Kalidos morambrae K.C. Emberton, 2007 - (ARIOPHANTIDAE)
- morana, Pseudosetia morana (H.S. Ladd, 1966 †) - (RISSOIDAE) (FOSSIL)
- moranensis, Cernuella moranensis W. Kobelt, 1907 - syn of: Cernuella virgata (E.M. Da Costa, 1778) - (HYGROMIIDAE)
- morangiana, Tellina morangiana Martin, 1922 † - syn of: Tellina merangiana Martin, 1922 † - (TELLINIDAE) (FOSSIL)
- morani, Semele morani Anderson & Martin, 1914 † - (SEMELIDAE) (FOSSIL)
- morani, Tropites morani Smith, 1927 † - (TROPITIDAE) (FOSSIL)
- morani, Pomaulax morani Loel & Corey, 1932 † - (TURBINIDAE) (FOSSIL)
- Morania, Genus Morania Horný, 1953 † (MURCHISONIIDAE) (FOSSIL)
- moraniana, Amplirhagada moraniana F. Köhler, 2011 - (CAMAENIDAE)
- moranianus, Caesia moranianus Martin, 1914 † - (NASSARIIDAE) (FOSSIL)
- morantensis, Aliculastrum morantensis W.P. Woodring, 1928 † - (HAMINOEIDAE) (FOSSIL)
- moraria, Eucithara moraria C. Hedley, 1922 - (MANGELIIDAE)
- morasensis, Hydrobia morasensis C.F. Fontannes, 1883 † - (HYDROBIIDAE) (FOSSIL)
- morata, Trozena morata T. Iredale, 1938 - (CAMAENIDAE)
- moratensis, Douglassia moratensis P.J. Fallon, 2016 - (DRILLIIDAE)
- morator, Cuna morator C.R. Laws, 1940 † - (CONDYLOCARDIIDAE) (FOSSIL)
- moratora, Odostomia moratora W.H. Dall & P. Bartsch, 1909 - (PYRAMIDELLIDAE)
- moratus, Obelus moratus (A. Mousson, 1872) - (COCHLICELLIDAE)
- moravesa, Doto moravesa J.A. Ortea, 1997 - (DOTIDAE)
- moravica, Staliopsis moravica Rzehak, 1893 † - (AMNICOLIDAE) (FOSSIL)
- moravica, Pollia moravica R. Hoernes & M. Auinger, 1884 - syn of: Pollia dorbignyi (B.C.M. Payraudeau, 1826) - (BUCCINIDAE)
- moravica, Vestia ranojevici moravica (J. Brabenec, 1952) - (CLAUSILIIDAE)
- moravica, Rissoina moravica M. Hörnes, 1856 † - (RISSOINIDAE) (FOSSIL)
- moravicum, Praeglyphioceras moravicum Rzehak, 1910 † - syn of: Erfoudites moravicus (Rzehak, 1910 †) - (PRAEGLYPHIOCERATIDAE) (FOSSIL)
- moravicus, Lithoconus moravicus Hoernes & Auinger, 1879 † - (CONIDAE) (FOSSIL)
- moravicus, Ancylus moravicus Rzehak, 1893 † - (PLANORBIDAE) (FOSSIL)
- moravicus, Potamides moravicus R. Hoernes, 1874 † - (POTAMIDIDAE) (FOSSIL)
- moravicus, Erfoudites moravicus (Rzehak, 1910 †) - (SPORADOCERATIDAE) (FOSSIL)
- moravicus variabilis, Potamides moravicus variabilis Friedberg, 1914 † - (POTAMIDIDAE) (FOSSIL)
- Moravisphinctes, Genus Moravisphinctes Kilian, 1889 † (ATAXIOCERATIDAE) (FOSSIL)
- morbida, Leptachatina morbida C.M. Cooke, 1911 - (AMASTRIDAE)
- morbida, Calyptraea morbida T. Habe & S. Kosuge, 1965 - syn of: Desmaulus extinctorium morbida (L.A. Reeve, 1859) - (CALYPTRAEIDAE)
- morbida, Calyptraea morbida L.A. Reeve, 1859 - syn of: Desmaulus extinctorium morbida (L.A. Reeve, 1859) - (CALYPTRAEIDAE)
- morbida, Desmaulus extinctorium morbida (L.A. Reeve, 1859) - (CALYPTRAEIDAE)
- morbida, Hemitrochus morbida (P.M.A. Morelet) - (CEPOLIDAE)
- morbida, Patella morbida L.A. Reeve, 1855 - syn of: Scutellastra granularis (C. Linnaeus, 1758) - (PATELLIDAE)
- morbida, Duplicaria morbida (L.A. Reeve, 1860) - (TEREBRIDAE)
- morbidus, Drymaeus vexillum morbidus (R.A. Philippi, 1867) - (BULIMULIDAE)
- morbiense, Jacobella morbiense Renz, 1925 † - (HILDOCERATIDAE) (FOSSIL)
- morbihiana, Helicella morbihiana J.R. Bourguignat in É.A.A. Locard, 1882 - syn of: Helicella itala (C. Linnaeus, 1758) - (HYGROMIIDAE)
- morbillosa, Ovatipsa morbillosa P.F. Röding, 1798 - syn of: Ovatipsa chinensis (J.F. Gmelin, 1791) - (CYPRAEIDAE)
- morbosa, Tornatellaea morbosa Finlay & J. Marwick, 1937 † - (ACTEONIDAE) (FOSSIL)
- morchi, Buccinum morchi H.B.S. Friele, 1877 - (BUCCINIDAE)
- morchi, Plastiscala morchi (G.F. Angas, 1871) - (EPITONIIDAE)
- morchi, Epitonium morchi G.F. Angas, 1871 - syn of: Plastiscala morchi (G.F. Angas, 1871) - (EPITONIIDAE)
- morchi, Oenopota morchi (W. Leche, 1878) - (MANGELIIDAE)
- morchi, Aspella morchi G.E. Radwin & D'Attilio, 1976 - (MURICIDAE)
- morchi, Turbonilla morchi W.H. Dall & P. Bartsch, 1907 - (PYRAMIDELLIDAE)
- morchi, Volvulella morchi W.H. Dall, 1927 - syn of: Volvulella persimilis (O.A.L. Mörch, 1875) - (RHIZORIDAE)
- morchi, Succinea undulata morchi R.W. Dunker, 1889 - (SUCCINEIDAE)
- morchi, Lora morchi W. Leche, 1878 - syn of: Oenopota morchi (W. Leche, 1878) - (TURRIDAE)
- morchi, Serpulorbis morchi G.P. Deshayes, 1861 - (VERMETIDAE)
- morchi bentha, Plastiscala morchi bentha T. Iredale, 1936 - (EPITONIIDAE)
- morchi profundior, Plastiscala morchi profundior T. Iredale, 1936 - (EPITONIIDAE)
- Morchia, syn of: Subgenus Haplotrema (Zophos) G.P.L.K. Gude, 1911 (HAPLOTREMATIDAE)
- Morchia, syn of: Genus Pterynotus W.J. Swainson, 1833 (MURICIDAE)
- Morchia, syn of: Genus Morchiella K.H.J. Thiele, 1925 (TORNIDAE)
- morchiana, Volutharpa morchiana P. Fischer, 1859 - syn of: Buccinum baeri A.T. von Middendorff, 1848 - (BUCCINIDAE)
- morchiana, Mytilopsis morchiana R.W. Dunker, 1855 - syn of: Mytilopsis sallei (C.A. Récluz, 1849) - (DREISSENIDAE)
- morchiana, Opalia morchiana W.H. Dall, 1889 - (EPITONIIDAE)
- morchiana, Fadyenia morchiana E. Chitty, 1857 - (HELICINIDAE)
- morchianum, Buccinum morchianum R.W. Dunker, 1858 - (BUCCINIDAE)
- morchianum castaneum, Buccinum morchianum castaneum W.H. Dall, 1877 - syn of: Buccinum castaneum W.H. Dall, 1877 - (BUCCINIDAE)
- morchianum inclytum, Buccinum morchianum inclytum H.A. Pilsbry, 1904 - (BUCCINIDAE)
- Morchiella, Genus Morchiella K.H.J. Thiele, 1925 (TORNIDAE)
- morchiella, Pandalosia morchiella C.K. Chang & W.L. Wu, 2004 - syn of: Schwartziella moerchiella (C.K. Chang & W.L. Wu, 2004) - (ZEBINIDAE)
- Mörchiella, syn of: Genus Morchiella K.H.J. Thiele, 1925 (TORNIDAE)
- morchii, Colus olavi morchii F.W. Harmer † - (BUCCINIDAE) (FOSSIL)
- morchii, Chromodoris morchii L.S.R. Bergh, 1879 - syn of: Glossodoris moerchi (L.S.R. Bergh, 1879) - (CHROMODORIDIDAE)
- morchii, Gibberula morchii J.H. Redfield, 1870 - syn of: Cystiscus politus (P.P. Carpenter, 1857) - (CYSTISCIDAE)
- morchii, Cancilla morchii A. Adams, 1855 - syn of: Cancilla isabella morchii A. Adams, 1855 - (MITRIDAE)
- morchii, Cancilla isabella morchii A. Adams, 1855 - (MITRIDAE)
- morchii, Cerithidea rhizophorarum morchii A. Adams, 1855 - (POTAMIDIDAE)
- morchii, Dosinia morchii A. Römer, 1862 - syn of: Dosinia alta (R.W. Dunker, 1849) - (VENERIDAE)
- Morchinella, syn of: Genus Morchiella K.H.J. Thiele, 1925 (TORNIDAE)
- mordani, Bostryx mordani A.S.H. Breure, 1978 - (BULIMULIDAE)
- Mordania, syn of: Subgenus Iranopsis (Mordaniella) Bank & Neubert, 2016 (ENIDAE)
- Mordaniella, Subgenus Iranopsis (Mordaniella) Bank & Neubert, 2016 (ENIDAE)
- mordax, Anguispira mordax (R.J. Shuttleworth, 1852) - (DISCIDAE)
- mordax, Nodilittorina mordax K. Bandel & D. Kadolsky, 1982 - syn of: Echinolittorina jamaicensis (C.B. Adams, 1850) - (LITTORINIDAE)
- mordax, Ostrea mordax A.A. Gould, 1850 - syn of: Saccostrea scyphophilla (F. Péron & C.A. Lesueur, 1807) - (OSTREIDAE)
- mordax, Saccostrea mordax A.A. Gould, 1850 - syn of: Saccostrea scyphophilla (F. Péron & C.A. Lesueur, 1807) - (OSTREIDAE)
- mordax, Parachondria mordax (C.B. Adams, 1849) - (POMATIIDAE)
- mordax, Varicospira mordax (Martin, 1916 †) - (ROSTELLARIIDAE) (FOSSIL)
- mordax cornucopiaeformis, Ostrea mordax cornucopiaeformis W. Saville-Kent, 1893 - syn of: Saccostrea scyphophilla (F. Péron & C.A. Lesueur, 1807) - (OSTREIDAE)
- mordeirae, Africonus mordeirae (E. Rolán & H. Trovão, 1990) - (CONIDAE)
- mordica, Nassaria mordica C. Hedley, 1909 - syn of: Orania fischeriana (C.M. Tapparone-Canefri, 1882) - (NASSARIIDAE)
- Mordica, syn of: Genus Veprecula J.C. Melvill, 1917 (RAPHITOMIDAE)
- Mordicamarginella, syn of: Genus Marginella J.B.P.A. Lamarck, 1799 (MARGINELLIDAE)
- morditus, Latisipho morditus (W.H. Dall, 1919) - (BUCCINIDAE)
- morditus, Aulacofusus morditus W.H. Dall, 1919 - syn of: Latisipho morditus (W.H. Dall, 1919) - (BUCCINIDAE)
- mordovense, Audouliceras mordovense Stenshin, Shumilkin & Uspensky, 2014 † - (ANCYLOCERATIDAE) (FOSSIL)
- Morea, Genus Morea Conrad, 1860 † (PHOLIDOTOMIDAE) (FOSSIL)
- moreana, Gastrochaena moreana Buvignier, 1852 † - (GASTROCHAENIDAE) (FOSSIL)
- moreana, Phaneroptyxis moreana (A.V.M.D. D'Orbigny, 1841 †) - (ITIERIIDAE) (FOSSIL)
- moreana, Nerinea moreana A.V.M.D. D'Orbigny, 1841 † - syn of: Phaneroptyxis moreana (A.V.M.D. D'Orbigny, 1841 †) - (NERINEIDAE) (FOSSIL)
- moreana, Rissoa moreana Buvignier, 1852 † - (RISSOIDAE) (FOSSIL)
- moreanum, Dentalium moreanum d'Orbigny, 1845 † - (DENTALIIDAE) (FOSSIL)
- moreanus, Ammonites moreanus d'Orbigny, 1844 † - (AMMONITIDA (UNASSIGNED)) (FOSSIL)
- moreanus, Murex moreanus A. De Gregorio, 1885 - syn of: Bolinus brandaris (C. Linnaeus, 1758) - (MURICIDAE)
- moreanus, Pileolus moreanus A.V.M.D. D'Orbigny, 1850 † - (PILEOLIDAE) (FOSSIL)
- moreauensis, Clisocolus moreauensis (Meerk & Hayden, 1861 †) - (MACTROMYIDAE) (FOSSIL)
- moreaui, Daphnella moreaui M.A. Peyrot, 1932 † - (RAPHITOMIDAE) (FOSSIL)
- Moreauoceras, Genus Moreauoceras Cullison, 1944 † (TARPHYCERATIDAE) (FOSSIL)
- moreausea, Purpuroidea moreausea (Buvignier, 1843 †) - (PURPUROIDEIDAE) (FOSSIL)
- moreausiana, Pterocera moreausiana A.V.M.D. D'Orbigny, 1843 † - syn of: Ceratosiphon moreausianus (A.V.M.D. D'Orbigny, 1843 †) - (STROMBIDAE) (FOSSIL)
- moreausianus, Ceratosiphon moreausianus (A.V.M.D. D'Orbigny, 1843 †) - (APORRHAIDAE) (FOSSIL)
- moreausum, Paracenoceras moreausum (A.V.M.D. D'Orbigny, 1842 †) - (PARACENOCERATIDAE) (FOSSIL)
- moreirai, Connexochiton moreirai (G. Righi, 1973) - (ISCHNOCHITONIDAE)
- moreirai, Ptomatis moreirai A.H. Clarke, 1913 † - (PLECTONOTIDAE) (FOSSIL)
- morelandi, Cuspidaria morelandi R.K. Dell, 1956 - (CUSPIDARIIDAE)
- moreleti, Clavator moreleti J.C.H. Crosse & P.H. Fischer, 1868 - (ACAVIDAE)
- moreleti, Letourneuxia moreleti (P. Hesse, 1884) - (ARIONIDAE)
- moreleti, Calocochlia moreleti L. Pfeiffer, 1848 - (BRADYBAENIDAE)
- moreleti, Caecum moreleti L. de Folin, 1869 - syn of: Meioceras nitidum (W. Stimpson, 1851) - (CAECIDAE)
- moreleti, Cerion iostomum moreleti W.J. Clench & C.G. Aguayo, 1951 - (CERIONIDAE)
- moreleti, Cerithiopsis moreleti L. de Folin, 1868 - syn of: Seila assimilata (C.B. Adams, 1852) - (CERITHIOPSIDAE)
- moreleti, Virgiconus moreleti (J.C.H. Crosse, 1858) - (CONIDAE)
- moreleti, Rhiostoma moreleti P. Dautzenberg & A.R.J.B. Bavay - (CYCLOPHORIDAE)
- moreleti, Diaphera moreleti (J.G. Hidalgo, 1889) - (DIAPHERIDAE)
- moreleti, Melampus moreleti H.A. Pilsbry & J.C. Bequaert, 1927 - (ELLOBIIDAE)
- moreleti, Ferussacia moreleti (P.M. Pallary, 1898) - (FERUSSACIIDAE)
- moreleti, Melanopsis moreleti P.M. Pallary, 1916 - syn of: Melanopsis frustulum P.M.A. Morelet, 1857 - (MELANOPSIDAE)
- moreleti, Theodoxus moreleti E.A. Allen, 1856 - syn of: Theodoxus fluviatilis (C. Linnaeus, 1758) - (NERITIDAE)
- moreleti, Patella moreleti H. Drouët, 1891 - syn of: Patella candei D'Orbigny, 1840 - (PATELLIDAE)
- moreleti, Haitia moreleti D.W. Taylor, 2003 - (PHYSIDAE)
- moreleti, Ancylus moreleti J.R. Bourguignat - syn of: Ancylus fluviatilis O.F. Müller, 1774 - (PLANORBIDAE)
- moreleti, Cerithidea moreleti (G.E.J. Wattebled, 1886) - (POTAMIDIDAE)
- moreleti, Aphanistylus moreleti G.E.J. Wattebled, 1886 - syn of: Cerithidea moreleti (G.E.J. Wattebled, 1886) - (POTAMIDIDAE)
- moreleti, Onoba moreleti P. Dautzenberg, 1889 - (RISSOIDAE)
- moreleti, Edentulina moreleti (C.B. Adams, 1868) - (STREPTAXIDAE)
- moreleti, Subulina moreleti (A.A.A. Girard, 1893) - (SUBULINIDAE)
- moreleti, Oxyloma moreleti A.A. Baudon, 1877 - syn of: Oxyloma elegans (A. Risso, 1826) - (SUCCINEIDAE)
- moreleti, Morchiella moreleti (P. Fischer, 1877) - (TORNIDAE)
- moreleti, Microcondylus moreleti H. Drouët, 1879 - syn of: Microcondylaea compressa (K.T. Menke, 1830) - (UNIONIDAE)
- moreleti, Pseudodon moreleti J.C.H. Crosse & P.H. Fischer, 1876 - syn of: Pseudodon tumidus (P.M.A. Morelet, 1866) - (UNIONIDAE)
- moreleti, Cylindrella moreleti G.P. Deshayes, 1851 - syn of: Coelocentrum tomacella (P.M.A. Morelet, 1849) - (UROCOPTIDAE)
- moreleti, Leidyula moreleti (J.C.H. Crosse & P.H. Fischer, 1872) - (VERONICELLIDAE)
- moreleti, Nesopupa moreleti (A.D. Brown, 1870) - (VERTIGINIDAE)
- moreleti, Mekongia moreleti (G.P. Deshayes, 1874) - (VIVIPARIDAE)
- Moreletia, Subgenus Omphalina (Moreletia) J.E. Gray, 1855 (ZONITIDAE)
- moreletiana, Achatina moreletiana G.P. Deshayes, 1851 - (ACHATINIDAE)
- moreletiana, Bithynia moreletiana G. Nevill, 1877 - (BITHYNIIDAE)
- moreletiana, Nesiohelix moreletiana (P.M. Heude, 1882) - (BRADYBAENIDAE)
- moreletiana, Albinaria moreletiana O. Böttger, 1878 - (CLAUSILIIDAE)
- moreletiana, Corbicula moreletiana T. Prime, 1867 - (CYRENIDAE)
- moreletiana, Helicina moreletiana L. Pfeiffer, 1851 - (HELICINIDAE)
- moreletiana, Physa moreletiana S. Clessin, 1886 - syn of: Lymnaea producta J.W. Mighels, 1845 - (PHYSIDAE)
- moreletiana, Abbottella moreletiana (J.C.H. Crosse, 1873) - (POMATIIDAE)
- moreletiana gabriella, Abbottella moreletiana gabriella P. Bartsch, 1946 - (POMATIIDAE)
- moreletiana kriegeri, Abbottella moreletiana kriegeri P. Bartsch, 1946 - (POMATIIDAE)
- moreletiana wetmorei, Abbottella moreletiana wetmorei P. Bartsch, 1946 - (POMATIIDAE)
- moreletianum, Opisthosiphon moreletianum (S.A.A. Petit De La Saussaye, 1842) - (POMATIIDAE)
- moreletianum columbense, Opisthosiphon moreletianum columbense C. de la Torre & P. Bartsch, 1941 - (POMATIIDAE)
- moreletianus, Rhachis moreletianus C.M.F. Ancey, 1882 - (CERASTUIDAE)
- moreletianus, Spiraxis moreletianus L. Pfeiffer, 1866 - (SPIRAXIDAE)
- moreletianus, Unio moreletianus P.M. Heude, 1883 - syn of: Lamprotula kouangensis (C.T. Simpson, 1900) - (UNIONIDAE)
- moreletianus, Unio moreletianus L. de Folin & F. Bèrillon, 1877 - syn of: Unio mancus J.B.P.A. Lamarck, 1819 - (UNIONIDAE)
- Moreletina, Genus Moreletina A. Martins, 2002 (HYGROMIIDAE)
- moreletti, Trochonanina moreletti J. Germain - (UROCYCLIDAE)
- moreli, Patella moreli G.P. Deshayes, 1863 - syn of: Scutellastra flexuosa (J.R.C. Quoy & J.P. Gaimard, 1834) - (PATELLIDAE)
- moreli, Hypophylloceras moreli (A.V.M.D. D'Orbigny, 1841 †) - (PHYLLOCERATIDAE) (FOSSIL)
- morelleti, Patella morelleti H. Drouët, 1858 - (PATELLIDAE)
- morelli, Sigaretus morelli S. Delle Chiaje, 1841 - syn of: Lamellaria perspicua (C. Linnaeus, 1758) - (NATICIDAE)
- morelli, Marsenia morelli S. Delle Chiaje, 1841 - syn of: Lamellaria perspicua (C. Linnaeus, 1758) - (VELUTINIDAE)
- morellii, Theodoxus morellii (L.M.D. Bellardi & O.G. Michelotti, 1841 †) - (NERITIDAE) (FOSSIL)
- morelosensis, Cerithiopsis morelosensis E. Rolán & R. Fernández-Garcés, 2010 - (CERITHIOPSIDAE)
- morelosensis, Holospira morelosensis P. Bartsch, 1947 - syn of: Holospira rehderi P. Bartsch, 1947 - (UROCOPTIDAE)
- Moremanoceras, Genus Moremanoceras Cobban , 1972 † (DESMOCERATIDAE) (FOSSIL)
- morenae, Joculator morenae A. Cecalupo & I. Perugia, 2013 - (CERITHIOPSIDAE)
- morenasi, Ostrea morenasi A. de Rochebrune, 1905 - syn of: Crassostrea tulipa (J.B.P.A. Lamarck, 1819) - (OSTREIDAE)
- morenensis, Faustella morenensis M. Seddon, 1990 - (HYGROMIIDAE)
- morenensis, Marocella morenensis (E.L. Yochelson & Gil Cid, 1984 †) - (MAROCELLIDAE) (FOSSIL)
- morenoensis, Hokkaidoconcha morenoensis S. Kiel & al., 2008 † - (PROVANNIDAE) (FOSSIL)
- morenoi, Drymaeus morenoi H.B. Preston, 1907 - (BULIMULIDAE)
- morenoi, Doris morenoi J.A. Ortea, 1989 - (DORIDIDAE)
- morenoi, Iberhoratia morenoi B. Arconada, D. Delicado & M.A. Ramos, 2007 - (HYDROBIIDAE)
- morenoi, Annularia morenoi (C. de la Torre & P. Bartsch, 1941) - (POMATIIDAE)
- morenoi, Chondrothyrium violaceum morenoi M.L. Jaume & Sánchez De Fuentes, 1943 - (POMATIIDAE)
- morenoi, Turbonilla morenoi A. Peñas & E. Rolán, 2010 - (PYRAMIDELLIDAE)
- morenoi, Crisilla morenoi J. Templado & E. Rolán, 1994 - (RISSOIDAE)
- morenoi, Heterocoptis morenoi C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- moreri, Xerocrassa moreri P. Fagot, 1886 - syn of: Amandana salvanae (P. Fagot, 1886) - (HYGROMIIDAE)
- mores, Volvarina mores J. Espinosa & J.A. Ortea, 2006 - (MARGINELLIDAE)
- Morestia, syn of: Genus Mnestia H. Adams & A. Adams, 1854 (MNESTIIDAE)
- moreti, Ancyloceras matheronianum moreti G.F. Roch, 1927 † - (ANCYLOCERATIDAE) (FOSSIL)
- moreti, Lechites moreti Breistroffer, 1936 † - (BACULITIDAE) (FOSSIL)
- moreti, Hypophylloceras moreti Mahmoud, 1955 † - (PHYLLOCERATIDAE) (FOSSIL)
- moreti, Pseudothersitea moreti Savornin, 1938 † - (THERSITEIDAE) (FOSSIL)
- moretonensis, Pisinna moretonensis W.F. Ponder & E.K. Yoo, 1976 - (ANABATHRIDAE)
- moretonensis, Corbula moretonensis K.L. Lamprell & J.M. Healy, 1997 - (CORBULIDAE)
- moretonensis, Austrasiatica langfordi moretonensis (F.A. Schilder, 1965) - (CYPRAEIDAE)
- moretonensis, Helix moretonensis L.A. Reeve, 1854 - syn of: Xanthomelon spheroidea (E.J. Le Guillou, 1845) - (HELICIDAE)
- moretonensis, Solemya moretonensis D.W. Taylor, E.A. Glover & S.T. Williams, 2008 - (SOLEMYIDAE)
- moretonensis, Macoma moretonensis G.P. Deshayes, 1855 - syn of: Sylvanus lilium (S.C.T. Hanley, 1844) - (TELLINIDAE)
- moretonensis, Colpospira moretonensis T.A. Garrard, 1972 - (TURRITELLIDAE)
- moretonensis, Cycladicama moretonensis (G.P. Deshayes, 1855) - (UNGULINIDAE)
- moretonensis, Cyrenella moretonensis G.P. Deshayes, 1855 - syn of: Cycladicama moretonensis (G.P. Deshayes, 1855) - (UNGULINIDAE)
- moretonensis, Clementia moretonensis G.P. Deshayes, 1854 - syn of: Clementia papyracea (J.F. Gmelin, 1791) - (VENERIDAE)
- moretonensis, Cymbiola moretonensis P. Bail & A. Limpus, 1998 - (VOLUTIDAE)
- moretonica, Asperdaphne moretonica (E.A. Smith, 1882) - (RAPHITOMIDAE)
- moretonica, Pleurotoma moretonica E.A. Smith, 1882 - syn of: Asperdaphne moretonica (E.A. Smith, 1882) - (TURRIDAE)
- moretonicus, Velesunio moretonicus (L.A. Reeve, 1865) - (HYRIIDAE)
- moretonicus, Leptopecten moretonicus H.J. Finlay, 1927 - syn of: Leptopecten linki (W.H. Dall, 1926) - (PECTINIDAE)
- moretonicus, Unio moretonicus L.A. Reeve, 1865 - syn of: Velesunio moretonicus (L.A. Reeve, 1865) - (UNIONIDAE)
- moretonicus, Unio moretonicus E.A. Smith, 1874 - syn of: Westralunio carteri T. Iredale, 1934 - (UNIONIDAE)
- Moretonistes, Genus Moretonistes Stanisic, 2010 (CAMAENIDAE)
- Morewites, Genus Morewites Shigeta , 2014 † (NOSTOCERATIDAE) (FOSSIL)
- moreyensis, Rissoa moreyensis A.E.M. Cossmann, 1885 † - (RISSOIDAE) (FOSSIL)
- morgan, Caecum morgan A. Vannozzi, M. Pizzini & B.K. Raines, 2015 - (CAECIDAE)
- morgana, Antiguraleus morgana (K.H. Barnard, 1958) - (MANGELIIDAE)
- morgana, Antiguraleus morgana K.H. Barnard, 1958 - syn of: Antiguraleus morgana (K.H. Barnard, 1958) - (MANGELIIDAE)
- morgana, Roxania morgana (W.H. Dall, 1908) - (SCAPHANDRIDAE)
- morgana, Leucophysema morgana W.H. Dall, 1908 - syn of: Roxania morgana (W.H. Dall, 1908) - (SCAPHANDRIDAE)
- morganae, Cuspidaria morganae (J.A. Allen, 2011) - (CUSPIDARIIDAE)
- morganae, Luzonia morganae J.A. Allen, 2011 - syn of: Cuspidaria morganae (J.A. Allen, 2011) - (CUSPIDARIIDAE)
- morganense, Gyrophioceras morganense Taylor, 1998 † - (ARIETITIDAE) (FOSSIL)
- morganense, Muensteroceras morganense (Swallow, 1860 †) - (MUENSTEROCERATIDAE) (FOSSIL)
- morganensis, Ambercyclus morganensis (Stanton, 1895 †) - (EUCYCLIDAE) (FOSSIL)
- morgani, Amalda morgani (Allan, 1926 †) - (ANCILLARIIDAE) (FOSSIL)
- morgani, Astarte morgani Techmann, 1923 † - (ASTARTIDAE) (FOSSIL)
- morgani, Bailya morgani G.T. Watters, 2009 - (BUCCINIDAE)
- morgani, Fastigiella morgani A.E.M. Cossmann & G. Pissarro † - (CERITHIIDAE) (FOSSIL)
- morgani, Cerithium morgani Vasseur, 1881 † - (CERITHIIDAE) (FOSSIL)
- morgani, Microphaedusa morgani H. Nordsieck, 1978 - (CLAUSILIIDAE)
- morgani, Epitonium morgani (Vasseur, 1881 †) - (EPITONIIDAE) (FOSSIL)
- morgani, Chileutomia morgani A.E.M. Cossmann, 1915 † - (EULIMIDAE) (FOSSIL)
- morgani, Cleoniceras morgani Spath † - (HOPLITIDAE) (FOSSIL)
- morgani, Tournoueria morgani Š. Brusina 1870 † - (HYDROBIIDAE) (FOSSIL)
- morgani, Neoguraleus morgani (J. Marwick, 1924 †) - (MANGELIIDAE) (FOSSIL)
- morgani, Mathilda morgani M.E.A. de Boury, 1883 † - (MATHILDIDAE) (FOSSIL)
- morgani, Odontogryphaea morgani (Vredenburg 1916) † - (OSTREIDAE) (FOSSIL)
- morgani, Phasianella morgani Vasseur, 1881 † - (PHASIANELLIDAE) (FOSSIL)
- morgani, Pseudoheligmus morgani J.H.F. Douvillé, 1904 † - (PTERIIDA (UNASSIGNED)) (FOSSIL)
- morgani, Sassia morgani A.E. Ortmann, 1900 † - (RANELLIDAE) (FOSSIL)
- morgani, Amplogladius morgani (A.E.M. Cossmann & G. Pissarro, 1909 †) - (ROSTELLARIIDAE) (FOSSIL)
- morgani, Triphora morgani K.H. Barnard, 1963 - (TRIPHORIDAE)
- morgani, Trypanaxis morgani A.E.M. Cossmann & G. Pissarro † - (TRYPANAXIDAE) (FOSSIL)
- morgani, Dosina morgani (H.H. Suter, 1917 †) - (VENERIDAE) (FOSSIL)
- morgani, Placamen morgani (J. Marwick, 1924 †) - (VENERIDAE) (FOSSIL)
- Morgania, Genus Morgania Palmer, 1947 † (MELANOPSIDAE) (FOSSIL)
- morganianus, Sphaerocyclus morganianus (Hartt & Rathbun, 1875 †) - (BELLEROPHONTIDAE) (FOSSIL)
- morganiforme, Cleoniceras morganiforme C.F. Parona & Bonarelli 1897 † - (HOPLITIDAE) (FOSSIL)
- morgantownensis, Yoospira morgantownensis K. Bandel, 2002 † - (DONALDINIDAE) (FOSSIL)
- morgensterni, Scaliola morgensterni C.G. Semper, 1865 † - syn of: Scaliola mohrensterni C.G. Semper, 1865 † - (SCALIOLIDAE) (FOSSIL)
- mori, Acesta mori (L.G. Hertlein, 1952) - (LIMIDAE)
- Moria, Genus Moria (HYDROBIIDAE)
- moria, Laevidelos moria J. Stanisic, 2010 - (RHYTIDIDAE)
- moriana, Acanthotrigonia moriana (Yehara 1927) † - (PTEROTRIGONIIDAE) (FOSSIL)
- morianus, Hemiprionites morianus (Yehara, 1927 †) - (PRIONITIDAE) (FOSSIL)
- moribunda, Adamsiella moribunda (C.B. Adams, 1849) - (POMATIIDAE)
- moricandi, Mesembrinus moricandi (L. Pfeiffer, 1847) - (BULIMULIDAE)
- moricandi, Obba moricandi L. Pfeiffer, 1842 - (CAMAENIDAE)
- moricandi, Cyclopomops moricandi (L. Pfeiffer, 1852) - (NEOCYCLOTIDAE)
- moricandi, Hebetancylus moricandi (A.V.M.D. D'Orbigny, 1837) - (PLANORBIDAE)
- moricandi, Simpulopsis moricandi L. Pfeiffer, 1842 - (SIMPULOPSIDAE)
- moricandi brunnescens, Obba moricandi brunnescens O.F. von Möllendorff, 1892 - (CAMAENIDAE)
- moricandi hyalinoalbida, Mesembrinus moricandi hyalinoalbida J.C.H. Crosse & P.H. Fischer, 1875 - (BULIMULIDAE)
- Moricandia, Subgenus Cyclodontina (Moricandia) H.A. Pilsbry & E.G. Vanatta, 1898 (ODONTOSTOMIDAE)
- moricandiana, Fadyenia moricandiana (C.B. Adams, 1851) - (HELICINIDAE)
- moricandii, Anodontites moricandii (I. Lea, 1860) - (MYCETOPODIDAE)
- moricinctum, Ranularia moricinctum L.A. Reeve, 1844 - syn of: Ranularia cynocephala (J.B.P.A. Lamarck, 1816) - (RANELLIDAE)
- moricinum, Cardium moricinum de Loriol, 1866 † - (CARDIIDAE) (FOSSIL)
- moricola, Xerotricha moricola A. Paladilhe, 1875 - syn of: Xerotricha conspurcata (J.P.R. Draparnaud, 1801) - (HYGROMIIDAE)
- Moridilla, syn of: Genus Phidiana J.E. Gray, 1850 (FACELINIDAE)
- Moridunia, Genus Moridunia Cope, 1996 † (MODIOMORPHIDA (UNASSIGNED)) (FOSSIL)
- Moridunoceras, Genus Moridunoceras Evans , 2005 † (TROEDSSONELLIDAE) (FOSSIL)
- morierei, Scobinella morierei A.E.M. Cossmann, 1913 † - (CLATHURELLIDAE) (FOSSIL)
- morierei, Modiolopsis morierei (Tromelin, 1840 †) - (MODIOMORPHIDAE) (FOSSIL)
- morieri, Barbatia morieri G.P. Deshayes, 1858 † - (ARCIDAE) (FOSSIL)
- moriezense, Heteroceras moriezense Delanoy, 1998 † - (HETEROCERATIDAE) (FOSSIL)
- moriezense, Hypophylloceras moriezense (G. Sayn, 1920 †) - (PHYLLOCERATIDAE) (FOSSIL)
- moriforme, Pleurocera canaliculata moriforme I. Lea, 1862 - (PLEUROCERIDAE)
- moriformis, Murex moriformis R.P. Lesson, 1845 - syn of: Muricodrupa fiscella (J.F. Gmelin, 1791) - (MURICIDAE)
- morigii, Joculator morigii Cecalupo & Perugia, 2017 - (CERITHIOPSIDAE)
- morii, Inoceramus morii I. Hayami, 1959 † - (INOCERAMIDAE) (FOSSIL)
- morii, Mytiloceramus morii I. Hayami, 1959 † - syn of: Inoceramus kystatymensis Koschelkina, 1960 † - (PTERIIDA (unassigned)) (FOSSIL)
- morii, Semisulcospira morii H. Watanabe, 1984 - (SEMISULCOSPIRIDAE)
- morii, Musculium morii Y.I. Starobogatov & L.L. Budnikova, 1985 - syn of: Sphaerium miyadii A. Mori, 1933 - (SPHAERIIDAE)
- morillensis, Tympanotonos morillensis Dominici & T. Kowalke, 2014 † - (POTAMIDIDAE) (FOSSIL)
- morimotoi, Saganoa morimotoi J.T. Kuroda & T. Habe, 1958 - (HYDROBIIDAE)
- Morimusculium, syn of: Genus Sphaerium J.A. Scopoli, 1777 (SPHAERIIDAE)
- morinensis, Donaldiella morinensis Horný, 1952 † - syn of: Cyrtostropha morinensis (Horný, 1952 †) - (LOPHOSPIRIDAE) (FOSSIL)
- morinensis, Cyrtostropha morinensis (Horný, 1952 †) - (MURCHISONIIDAE) (FOSSIL)
- moringa, Condylocuna moringa C.F. Laseron, 1953 - syn of: Cunanax pisum (C. Hedley, 1908) - (CONDYLOCARDIIDAE)
- moringa, Cunanax moringa C.F. Laseron, 1953 - syn of: Cunanax pisum (C. Hedley, 1908) - (CONDYLOCARDIIDAE)
- morini, Homalopoma morini J.M.R.M. Viader, 1951 - (COLLONIIDAE)
- morini, Zafra morini (J.M.R.M. Viader, 1938) - (COLUMBELLIDAE)
- morini, Epirobia morini E.C. Von Martens, 1863 - syn of: Epirobia polygyrella (E.C. Von Martens, 1863) - (EPIROBIIDAE)
- morini, Epirobia morini P.M.A. Morelet, 1849 - syn of: Brachypodella morini (P.M.A. Morelet, 1849) - (EPIROBIIDAE)
- morini, Sphaerium morini G. Servain, 1882 - syn of: Sphaerium rivicola W.E. Leach in J.B.P.A. Lamarck, 1815 - (SPHAERIIDAE)
- morini, Psoronaias morini (P.M.A. Morelet, 1851) - (UNIONIDAE)
- morini, Anodonta morini G. Servain, 1882 - syn of: Anodonta cygnea (C. Linnaeus, 1758) - (UNIONIDAE)
- morini, Brachypodella morini (P.M.A. Morelet, 1849) - (UROCOPTIDAE)
- morini, Nesopupa morini E.H. Madge - (VERTIGINIDAE)
- morini, Nesopupa morini (E.C. Von Martens, 1898) - (VERTIGINIDAE)
- morini salpinx, Brachypodella morini salpinx (H.B. Tristram, 1861) - (UROCOPTIDAE)
- morini sargi, Brachypodella morini sargi (E.C. Von Martens, 1897) - (UROCOPTIDAE)
- morinis, Luria morinis W.M. Ingram, 1939 - syn of: Luria cinerea (J.F. Gmelin, 1791) - (CYPRAEIDAE)
- morio, Aplysia morio (A.E. Verrill, 1901) - (APLYSIIDAE)
- Morio, syn of: Genus Galeodea J.H.F. Link, 1807 (CASSIDAE)
- morio, Luria morio F.C. Meuschen, 1787 - syn of: Luria cinerea (J.F. Gmelin, 1791) - (CYPRAEIDAE)
- morio, Pugilina morio (C. Linnaeus, 1758) - (MELONGENIDAE)
- morio, Nerita morio (G.B. I Sowerby, 1833) - (NERITIDAE)
- morio, Neritina morio G.B. I Sowerby, 1833 - syn of: Nerita morio (G.B. I Sowerby, 1833) - (NERITIDAE)
- morio, Patella morio J. Noodt, 1819 - syn of: Cellana radians (J.F. Gmelin, 1791) - (PATELLIDAE)
- morio, Pteria morio W.E. Leach, 1814 - syn of: Pteria avicula H.S. Holten, 1802 - (PTERIIDAE)
- morio, Gibbula morio A. Risso, 1826 - syn of: Clanculus jussieui (B.C.M. Payraudeau, 1826) - (TROCHIDAE)
- morio aethiops, Pugilina morio aethiops (P.F. Röding, 1798) - (MELONGENIDAE)
- morio deplanatus, Pugilina morio deplanatus (P.F. Röding, 1798) - (MELONGENIDAE)
- Morionassa, syn of: Genus Sconsia J.E. Gray, 1847 (CASSIDAE)
- Morionella, Subgenus Cassis (Morionella) W.H. Dall, 1909 † (CASSIDAE) (FOSSIL)
- morioria, Pisinna micronema morioria (A.W.B. Powell, 1933) - (ANABATHRIDAE)
- morioria, Maurea morioria A.W.B. Powell, 1946 - syn of: Calliostoma waikanae (W.R.B. Oliver, 1926) - (CALLIOSTOMATIDAE)
- morioria, Allodiscus morioria B.A. Marshall & G.M. Barker, 2008 - (CHAROPIDAE)
- morioria, Cuspidaria morioria R.K. Dell, 1956 - (CUSPIDARIIDAE)
- morioria, Haliotis virginea morioria A.W.B. Powell, 1938 - (HALIOTIDAE)
- morioria, Limatula morioria J. Marwick, 1928 † - (LIMIDAE) (FOSSIL)
- morioria, Mysella morioria R.K. Dell, 1952 - (MONTACUTIDAE)
- morioria, Pectinodonta morioria B.A. Marshall, 1985 - (PECTINODONTIDAE)
- morioria, Siogamaia morioria C.R. Laws, 1941 - (PYRAMIDELLIDAE)
- morioria, Onoba morioria (A.W.B. Powell, 1933) - (RISSOIDAE)
- morioria, Micrelenchus morioria A.W.B. Powell, 1933 - syn of: Cantharidus mortenseni (N.H. Odhner, 1924) - (TROCHIDAE)
- morisakii, Aulacophaedusa aulacophora morisakii (J.T. Kuroda & J.M. Abe, 1980) - (CLAUSILIIDAE)
- morisakii, Favartia morisakii J.T. Kuroda & T. Habe in T. Habe, 1961 - (MURICIDAE)
- morishimai, Seila morishimai (T. Habe, 1970) - (CERITHIOPSIDAE)
- morishimai, Notoseila morishimai T. Habe, 1970 - syn of: Seila morishimai (T. Habe, 1970) - (CERITHIOPSIDAE)
- morishimai, Ischnochiton morishimai Is. Taki, 1962 - (ISCHNOCHITONIDAE)
- morishimai, Coralliophila morishimai J.T. Kuroda & T. Shikama, 1966 - (MURICIDAE)
- morishuichiroi, Scalenostoma morishuichiroi T. Habe, 1968 - syn of: Bacula morisyuichiroi (T. Habe, 1968) - (EULIMIDAE)
- morisi, Cardinia morisi Terquem, 1855 † - syn of: Cardinia hybrida (Sowerby, 1817 †) - (CARDINIIDAE) (FOSSIL)
- morisi, Euspira morisi Awad & Abed, 1967 † - (NATICIDAE) (FOSSIL)
- morisii, Abraliopsis morisii (J.B. Vérany, 1839) - (ENOPLOTEUTHIDAE)
- morisii, Onychoteuthis morisii J.B. Vérany, 1839 - syn of: Abraliopsis morisii (J.B. Vérany, 1839) - (ONYCHOTEUTHIDAE)
- morisoni, Fimbria morisoni Woods † - (LUCINIDAE) (FOSSIL)
- moristans, Chione moristans A.A. Olsson & A. Harbison, 1953 † - (VENERIDAE) (FOSSIL)
- morisyuichiroi, Bacula morisyuichiroi (T. Habe, 1968) - (EULIMIDAE)
- morisyuichiroi, Bacula morisyuichiroi T. Habe, 1968 - syn of: Bacula morisyuichiroi (T. Habe, 1968) - (EULIMIDAE)
- morisyuichiroi, Charilda morisyuichiroi T. Habe, 1968 - syn of: Bacula morisyuichiroi (T. Habe, 1968) - (PYRAMIDELLIDAE)
- moritinctum, Cymatium moritinctum L.A. Reeve, 1844 - syn of: Ranularia cynocephala (J.B.P.A. Lamarck, 1816) - (RANELLIDAE)
- moritinctum, Ranularia moritinctum L.A. Reeve, 1844 - syn of: Ranularia cynocephala (J.B.P.A. Lamarck, 1816) - (RANELLIDAE)
- moritinctus, Mesembrinus moritinctus (E.C. Von Martens, 1893) - (BULIMULIDAE)
- moritinctus, Ranularia moritinctus L.A. Reeve, 1844 - syn of: Ranularia cynocephala (J.B.P.A. Lamarck, 1816) - (RANELLIDAE)
- moritzhoernesi, Cerithiopsis moritzhoernesi B.M. Landau, F. Da Silva & S.M. Heitz, 2016 † - (CERITHIOPSIDAE) (FOSSIL)
- moritzi, Ringicula moritzi L. de Folin, 1870 - syn of: Ringicula conformis T.A. de M. Monterosato, 1877 - (RINGICULIDAE)
- moritzianus, Dryptus moritzianus (L. Pfeiffer, 1847) - (AMPHIBULIMIDAE)
- moritzianus wilsoni, Dryptus moritzianus wilsoni H.A. Pilsbry, 1895 - (AMPHIBULIMIDAE)
- moriyai, Mesophaedusa vasta moriyai (J.T. Kuroda & Is. Taki, 1944) - (CLAUSILIIDAE)
- moriyai, Nuculana moriyai Marincovich Jr., 1993 † - (NUCULANIDAE) (FOSSIL)
- morkokense, Tarphyceras morkokense Balaschov † - (TARPHYCERATIDAE) (FOSSIL)
- morleti, Bithynia morleti G.E.J. Wattebled, 1886 - (BITHYNIIDAE)
- morleti, Neocepolis morleti (P. Dautzenberg & d'Hamonville, 1887) - (CAMAENIDAE)
- morleti, Leptopoma morleti A.E.M. Cossmann, 1892 † - (CYCLOPHORIDAE) (FOSSIL)
- morleti, Helix morleti P. Dautzenberg & d'Hamonville, 1887 - syn of: Neocepolis morleti (P. Dautzenberg & d'Hamonville, 1887) - (HELICIDAE)
- morleti, Nassa morleti J.C.H. Crosse, 1867 - syn of: Nassarius fossatus (A.A. Gould, 1850) - (NASSARIIDAE)
- morleti, Moerchia morleti P. Fischer, 1877 - (PYRAMIDELLIDAE)
- morleti, Sukashitrochus morleti (J.C.H. Crosse, 1880) - (SCISSURELLIDAE)
- morleti, Sinezona morleti J.C.H. Crosse, 1880 - syn of: Sukashitrochus morleti (J.C.H. Crosse, 1880) - (SCISSURELLIDAE)
- morleti, Diplodonta morleti A.E.M. Cossmann, 1887 † - (UNGULINIDAE) (FOSSIL)
- morleti, Mysia morleti A.E.M. Cossmann, 1887 † - (VENERIDAE) (FOSSIL)
- morlierei, Teinostoma morlierei F.P. Jousseaume, 1872 - (TORNIDAE)
- morlieri, Limatula morlieri A. Watelet, 1868 † - (LIMIDAE) (FOSSIL)
- Morlina, Subgenus Oxychilus (Morlina) A. Wagner, 1914 (OXYCHILIDAE)
- morloffsteinensis, Leptochiton morloffsteinensis (Fiedel & Keupp, 1988 †) - (LEPTOCHITONIDAE) (FOSSIL)
- morloti, Ammonites morloti J. Von Hauer, 1849 † - syn of: Mojsvarites agenor (Münster, 1834 †) - (AMMONITIDA (unassigned)) (FOSSIL)
- morloti, Paraspinoceras morloti (Ooster, 1860 †) - (ANCYLOCERATIDAE) (FOSSIL)
- morloti, Euptychoceras morloti (Ooster, 1860 †) - (BOCHIANITIDAE) (FOSSIL)
- morloti, Garroniceras morloti (Ooster, 1860 †) - (HAMULINIDAE) (FOSSIL)
- morloti, Lytoceras morloti Münster, 1834 † - syn of: Mojsvarites agenor (Münster, 1834 †) - (LYTOCERATIDAE) (FOSSIL)
- Morloti, Ptychoceras Morloti Ooster, 1860 † - syn of: Euptychoceras morloti (Ooster, 1860 †) - (PTYCHOCERATIDAE) (FOSSIL)
- morloti, Tropites morloti Mojsisovics, 1893 † - (TROPITIDAE) (FOSSIL)
- mormannensis, Helix mormannensis W. Kobelt, 1904 - syn of: Ambigua fuscolabiata tenetensis (W. Kobelt, 1904) - (HELICIDAE)
- mormonorum, Sonorella mormonorum H.A. Pilsbry, 1948 - (HELMINTHOGLYPTIDAE)
- mormonorum huasabensis, Sonorella mormonorum huasabensis W.B. Miller, 1967 - (HELMINTHOGLYPTIDAE)
- mormonum, Monadenia mormonum (L. Pfeiffer, 1857) - (MONADENIIDAE)
- mormonum loweana, Monadenia mormonum loweana H.A. Pilsbry - (MONADENIIDAE)
- mormosus, Hexabranchus mormosus Er. Marcus & Ev. Marcus, 1962 - syn of: Hexabranchus morsomus Er. Marcus & Ev. Marcus, 1962 - (HEXABRANCHIDAE)
- Mormula, Genus Mormula Monterosato, 1884 (PYRAMIDELLIDAE) (FOSSIL)
- Mormula, Subgenus Turbonilla (Mormula) A. Adams, 1864 (PYRAMIDELLIDAE)
- mormulaeformis, Opalia mormulaeformis (H. Masahito, J.T. Kuroda & T. Habe, 1971) - (EPITONIIDAE)
- Mormulasta, Genus Mormulasta C.F. Laseron, 1959 (PYRAMIDELLIDAE)
- mormuloides, Turbonilla mormuloides (S. Nomura, 1936) - (PYRAMIDELLIDAE)
- mormuloides, Pyrgiscilla mormuloides S. Nomura, 1936 - syn of: Turbonilla mormuloides (S. Nomura, 1936) - (PYRAMIDELLIDAE)
- Mormus, syn of: Genus Drymaeus J.A. Albers, 1850 (BULIMULIDAE)
- morningstarae, Gamizyga morningstarae Hoare & Sturgeon, 1980 † - (PSEUDOZYGOPLEURIDAE) (FOSSIL)
- morningtonensis, Limopsis morningtonensis G.B. Pritchard, 1901 † - (LIMOPSIDAE) (FOSSIL)
- moroccoensis, Assiminea moroccoensis E. Rolán, 2013 - (ASSIMINEIDAE)
- moroguesi, Palaeotachea moroguesi (Brongniart, 1810) † - (HELICIDAE) (FOSSIL)
- moroi, Napaeus moroi J.C. Martin, M.R. Alonso & C.M. Ibáñez, 2011 - (ENIDAE)
- morologus, Turrella morologus (C. Hedley, 1922) - (CLATHURELLIDAE)
- morologus, Guraleus morologus C. Hedley, 1922 - syn of: Turrella morologus (C. Hedley, 1922) - (MANGELIIDAE)
- morondavensis, Tropidophora morondavensis E. Fischer-Piette, 1949 - (POMATIIDAE)
- morongensis, Palaina morongensis O.F. von Möllendorff, 1890 - (DIPLOMMATINIDAE)
- morongoana, Eremarionta morongoana S.S. Berry, 1929 - (HELMINTHOGLYPTIDAE)
- moroniae, Bathymodiolus moroniae S. Kiel & M. Taviani, 2017 † - (MYTILIDAE) (FOSSIL)
- moronii, Sorgenfreispira moronii (Venzo & Pelosio, 1964 †) - (MANGELIIDAE) (FOSSIL)
- morontsiraka, Parvedentulina morontsiraka K.C. Emberton, 2002 - (STREPTAXIDAE)
- morosa, Diaulula morosa L.S.R. Bergh, 1907 - (DISCODORIDIDAE)
- morosa, Clithon morosa J. Gassies, 1870 - (NERITIDAE)
- morosa, Pleurobranchaea morosa (L.S.R. Bergh, 1892) - (PLEUROBRANCHAEIDAE)
- morosa, Tambja morosa (L.S.R. Bergh, 1877) - (POLYCERIDAE)
- morosa kushimotoensis, Tambja morosa kushimotoensis K. Baba, 1987 - (POLYCERIDAE)
- morosus, Arcestes morosus Mojsisovics, 1873 † - syn of: Cladiscites quadratus (Mojsisovics, 1873 †) - (ARCESTIDAE) (FOSSIL)
- morosus, Aspastus morosus (A.A. Gould, 1846) - (BOTHRIEMBRYONTIDAE)
- Moroteuthis, syn of: Genus Onykia C.A. Lesueur, 1821 (ONYCHOTEUTHIDAE)
- morphaea, Discodoris morphaea L.S.R. Bergh, 1877 - syn of: Sebadoris fragilis (J. Alder & A. Hancock, 1864) - (DISCODORIDIDAE)
- morpheos, Tompophiceras morpheos A.M. Popov, 1961 † - (XENODISCIDAE) (FOSSIL)
- morphina, Meretrix morphina (J.B.P.A. Lamarck, 1818) - (VENERIDAE)
- morphina, Periglypta morphina G.B. Sowerby, 1851 - syn of: Meretrix lamarckii G.P. Deshayes, 1853 - (VENERIDAE)
- Morphoceras, Genus Morphoceras Wetzel, 1937 † (MORPHOCERATIDAE) (FOSSIL)
- MORPHOCERATIDAE Hyatt, 1900 † - Family (CEPHALOPODA-AMMONOIDEA [Subclass]-AMMONITIDA [Order]-PERISPHINCTOIDEA [Superfamily]) (FOSSIL)
- Morphotropis, Genus Morphotropis Perner, 1903 † (ORIOSTOMATIDAE) (FOSSIL)
- morra, Mangilia morra W.H. Dall, 1881 - syn of: Rimosodaphnella morra (W.H. Dall, 1881) - (MANGELIIDAE)
- morra, Rimosodaphnella morra (W.H. Dall, 1881) - (RAPHITOMIDAE)
- morra, Veprecula morra W.H. Dall, 1881 - syn of: Rimosodaphnella morra (W.H. Dall, 1881) - (RAPHITOMIDAE)
- morraboolensis, Natica morraboolensis R. Tate, 1893 † - (NATICIDAE) (FOSSIL)
- morrelli, Achatina morrelli H.B. Preston - (ACHATINIDAE)
- morreni, Acamptogenotia morreni (Koninck, 1837 †) - (CLATHURELLIDAE) (FOSSIL)
- morreni, Pleurotoma morreni de Konninck, 1837 † - (TURRIDAE) (FOSSIL)
- morreni, Hemitissotia morreni (Coquand, 1862 †) - (VASCOCERATIDAE) (FOSSIL)
- morretesi, Scissurella morretesi P.C. Montouchet, 1972 - (SCISSURELLIDAE)
- morrhuana, Callocardia morrhuana W.H. Dall, 1902 - syn of: Agriopoma morrhuanum (W.H. Dall, 1902) - (VENERIDAE)
- morrhuanum, Agriopoma morrhuanum (W.H. Dall, 1902) - (VENERIDAE)
- morrhuanus, Pitar morrhuanus (W.H. Dall, 1902) - (VENERIDAE)
- morrhuanus, Pitar morrhuanus (Lisley, 1848 †) - (VENERIDAE) (FOSSIL)
- morrini, Anodonta morrini C.A. Westerlund, 1890 - syn of: Anodonta cygnea (C. Linnaeus, 1758) - (UNIONIDAE)
- morrisae, Cuspidaria morrisae J. Poutiers & F.R. Bernard, 1995 - (CUSPIDARIIDAE)
- morrisea, Ceritella morrisea (Buvignier) † - (CERITELLIDAE) (FOSSIL)
- morrisea, Purpuroidea morrisea (Buvignier) † - (PURPUROIDEIDAE) (FOSSIL)
- morrisi, Globularia morrisi Cox & Arkell, 1949 † - (AMPULLINIDAE) (FOSSIL)
- morrisi, Aturia morrisi O.G. Michelotti, 1847 † - syn of: Aturia aturi (B. de Basterot, 1825 †) - (ATURIIDAE) (FOSSIL)
- morrisi, Nudivagus morrisi H.L. Abbas, 1973 † - (CERITHIIDAE) (FOSSIL)
- morrisi, Brochidium morrisi E.L. Yochelson, 1956 † - (LIOTIIDAE) (FOSSIL)
- morrisi, Lophospira morrisi A.W. Grabau, 1922 † - syn of: Lophospira rectistriata W.J. Raymond, 1908 † - (LOPHOSPIRIDAE) (FOSSIL)
- morrisi, Morrisiceras morrisi (Oppel, 1857 †) - (MACROCEPHALITIDAE) (FOSSIL)
- morrisi, Melanopsis morrisi W.A. Wenz, 1928 † - (MELANOPSIDAE) (FOSSIL)
- morrisi, Brachidontes morrisi R.W. Dunker, 1857 - syn of: Brachidontes puniceus (J.F. Gmelin, 1791) - (MYTILIDAE)
- morrisi, Neithea morrisi Pictet & Renevier, 1858 † - (PECTINIDAE) (FOSSIL)
- morrisi, Pleurotomaria morrisi d'Orbigny † - (PLEUROTOMARIIDAE) (FOSSIL)
- morrisi, Gyrineum morrisi d'Archiac, 1854 † - (RANELLIDAE) (FOSSIL)
- morrisi, Dyasmya morrisi Dickins, 1999 † - (SANGUINOLITIDAE) (FOSSIL)
- morrisi, Pachymyonia morrisi (R. Etheridge jr., 1919 †) - (VACUNELLIDAE) (FOSSIL)
- morrisiana, Pleurotomaria morrisiana J.B.M. Dana, 1847 † - syn of: Peruvispira trifilata (J.B.M. Dana 1847 †) - (PLEUROTOMARIIDAE) (FOSSIL)
- morrisiana, Ptychomphalina morrisiana J.B.M. Dana, 1847 † - syn of: Peruvispira trifilata (J.B.M. Dana 1847 †) - (PTYCHOMPHALIDAE) (FOSSIL)
- Morrisiceras, Genus Morrisiceras Buckman, 1920 † (MACROCEPHALITIDAE) (FOSSIL)
- Morrisipecten, Genus Morrisipecten Muromtseva & Guskov, 1984 † (PTERIIDA (UNASSIGNED)) (FOSSIL)
- Morrisonella, syn of: Genus Belomitra P. Fischer, 1882 (BELOMITRIDAE)
- morrisoni, Fontigens morrisoni R. Hershler, J.R. Holsinger & L.R. Hubricht, 1990 - (AMNICOLIDAE)
- morrisoni, Ancilla morrisoni Y.I. Kantor, A.E. Fedosov & al., 2016 - (ANCILLARIIDAE)
- morrisoni, Assiminea morrisoni R.T. Abbott, 1958 - (ASSIMINEIDAE)
- morrisoni, Trifaricardium morrisoni J.J. Ter Poorten & M. Huber, 2007 - (CARDIIDAE)
- morrisoni, Oocorys morrisoni K. Kreipl & A. Alf, 2001 - syn of: Oocorys verrillii (W.H. Dall, 1889) - (CASSIDAE)
- morrisoni, Perrinia morrisoni H.S. Ladd, 1966 † - (CHILODONTIDAE) (FOSSIL)
- morrisoni, Pyrene morrisoni R.C. Willan, 2001 - syn of: Pyrene punctata (J.G. Bruguière, 1789) - (COLUMBELLIDAE)
- morrisoni, Pionoconus morrisoni (L. Raybaudi Massilia, 1991) - (CONIDAE)
- morrisoni, Zoila venusta morrisoni F.Jr. Lorenz, 2016 - (CYPRAEIDAE)
- morrisoni, Melampus morrisoni A.M. de F. Martins, 1996 - (ELLOBIIDAE)
- morrisoni, Fissurella morrisoni J.H. McLean, 1970 - (FISSURELLIDAE)
- morrisoni, Pyrgulopsis morrisoni R. Hershler, 1988 - (HYDROBIIDAE)
- morrisoni, Rivomarginella morrisoni R.A.M. Brandt, 1968 - (MARGINELLIDAE)
- morrisoni, Pterygia morrisoni M.P. Marrow, 2016 - (MITRIDAE)
- morrisoni, Henrya morrisoni P. Bartsch, 1947 - (MURCHISONELLIDAE)
- morrisoni, Vokesimurex morrisoni E.J. Petuch & D.M. Sargent, 2011 - (MURICIDAE)
- morrisoni, Sinomytilus morrisoni R.A.M. Brandt, 1974 - (MYTILIDAE)
- morrisoni, Olivella morrisoni A.A. Olsson, 1956 - (OLIVELLIDAE)
- morrisoni, Phenacovolva morrisoni F.Jr. Lorenz & D. Fehse, 2009 - (OVULIDAE)
- morrisoni, Pedicularia morrisoni F.Jr. Lorenz, 2013 - (PEDICULARIIDAE)
- morrisoni, Microdaphne morrisoni H.A. Rehder, 1980 - (RAPHITOMIDAE)
- morrisoni, Spondylus morrisoni P. Damarco, 2015 - (SPONDYLIDAE)
- morrisoni, Angulus morrisoni M. Huber, A. Langleit & K. Kreipl, 2015 - (TELLINIDAE)
- morrisoni, Thracia morrisoni R.E. Petit, 1964 - (THRACIIDAE)
- morrisoni, Tonna morrisoni C.G. Vos, 2005 - (TONNIDAE)
- morrisoni, Voluta morrisoni (E.J. Petuch, 1980) - (VOLUTIDAE)
- morrisoni harasewychi, Voluta morrisoni harasewychi (E.J. Petuch, 1984) - (VOLUTIDAE)
- Morrisonietta, Genus Morrisonietta R.A.M. Brandt, 1968 (PYRAMIDELLIDAE)
- morrocoyensis, Volvarina morrocoyensis G.M. Caballer, J. Espinosa & J.A. Ortea, 2013 - (MARGINELLIDAE)
- morrocoyensis, Rissoella morrocoyensis G.M. Caballer, J.A. Ortea & S. Narciso, 2011 - (RISSOELLIDAE)
- morroensis, Africonus morroensis T. Cossignani & R. Fiadeiro, 2014 - (CONIDAE)
- morroensis, Emarcusia morroensis R.A. Roller, 1972 - (FACELINIDAE)
- morroensis, Maioteuthis morroensis Reitner & Engeser, 1982 † - (TEUTHIDA (UNASSIGNED)) (FOSSIL)
- morrowanus, Proshumardites morrowanus W.J. Gordon, 1964 † - (AGATHICERATIDAE) (FOSSIL)
- morrowensis, Aviculopecten morrowensis Girty, 1910 † - (AVICULOPECTINIDAE) (FOSSIL)
- morrowensis, Glaphyrites morrowensis Miller & Moore, 1938 † - (GLAPHYRITIDAE) (FOSSIL)
- Morrowites, Genus Morrowites Cobban & Hook, 1983 † (ACANTHOCERATIDAE) (FOSSIL)
- Morrumbalia, Genus Morrumbalia Verdcourt, 1998 (UROCYCLIDAE)
- morseae, Macellomenia morseae K.M. Kocot & C. Todt, 2014 - (MACELLOMENIIDAE)
- morseana, Cochlicopa morseana H.L. Doherty, 1878 - (COCHLICOPIDAE)
- morseanum, Punctum morseanum H.A. Pilsbry, 1902 - (PUNCTIDAE)
- morsei, Limipecten morsei Newell, 1938 † - (AVICULOPECTINIDAE) (FOSSIL)
- morsei, Cyclocardia morsei W.H. Dall, 1891 - syn of: Cyclocardia borealis (T.A. Conrad, 1832) - (CARDITIDAE)
- morsei, Acirsa morsei (M. Yokoyama, 1926) - (EPITONIIDAE)
- morsei, Orthonychia morsei J.W. Hall 1843 † - (ORTHONYCHIIDAE) (FOSSIL)
- morsei, Palaeocapulus morsei Hoare, 2004 † - (PLATYCERATIDAE) (FOSSIL)
- morsei, Annularops attenuata morsei (C. de la Torre & P. Bartsch, 1941) - (POMATIIDAE)
- morsei, Turbonilla morsei M. Yokoyama, 1926 - syn of: Acirsa morsei (M. Yokoyama, 1926) - (PYRAMIDELLIDAE)
- morsei, Euprymna morsei (A.E. Verrill, 1881) - (SEPIOLIDAE)
- morsei, Teredo morsei P. Bartsch, 1922 - syn of: Teredo navalis C. Linnaeus, 1758 - (TEREDINIDAE)
- morsei, Vertigo morsei V. Sterki, 1894 - (VERTIGINIDAE)
- morsitans, Chione morsitans A.A. Olsson & A. Harbison, 1953 † - (VENERIDAE) (FOSSIL)
- morsitans??, Chione morsitans?? A.A. Olsson & A. Harbison, 1953 - (VENERIDAE)
- morsomus, Hexabranchus morsomus Er. Marcus & Ev. Marcus, 1962 - (HEXABRANCHIDAE)
- morsura, Thetidos morsura C. Hedley, 1899 - (CLATHURELLIDAE)
- morteauensis, Sensuitrochus morteauensis (Pictet & Campiche, 1863 †) - (CALLIOSTOMATIDAE) (FOSSIL)
- mortei, Chondrothyrium violaceum mortei C. de la Torre & P. Bartsch, 1938 - (POMATIIDAE)
- mortei, Nesocoptis mortei C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- mortensenae, Grandeliacus mortensenae T. Iredale, 1957 - syn of: Grandeliacus stramineus (J.F. Gmelin, 1791) - (ARCHITECTONICIDAE)
- mortensenae, Heliacus mortensenae T. Iredale, 1957 - syn of: Grandeliacus stramineus (J.F. Gmelin, 1791) - (ARCHITECTONICIDAE)
- mortenseni, Arca mortenseni H. Lynge, 1909 - syn of: Verilarca mortenseni (H. Lynge, 1909) - (ARCIDAE)
- mortenseni, Callochiton mortenseni N.H. Odhner, 1924 - (CALLOCHITONIDAE)
- mortenseni, Sphaerospira mortenseni T. Iredale, 1929 - (CAMAENIDAE)
- mortenseni, Discodoris mortenseni (Er. Marcus & Ev. Marcus, 1963) - (DISCODORIDIDAE)
- mortenseni, Montereina mortenseni (Er. Marcus & Ev. Marcus, 1963) - syn of: Discodoris mortenseni (Er. Marcus & Ev. Marcus, 1963) - (DISCODORIDIDAE)
- mortenseni, Trochostilifer mortenseni A. Warén, 1980 - (EULIMIDAE)
- mortenseni, Thyonicola mortenseni G. Mandahl-Barth, 1941 - (EULIMIDAE)
- mortenseni, Mitra mortenseni N.H. Odhner, 1924 - syn of: Volutomitra obscura (F.W. Hutton, 1873) - (MITRIDAE)
- mortenseni, Zeatrophon mortenseni (N.H. Odhner, 1924) - (MURICIDAE)
- mortenseni, Xymene mortenseni N.H. Odhner, 1924 - syn of: Zeatrophon mortenseni (N.H. Odhner, 1924) - (MURICIDAE)
- mortenseni, Verilarca mortenseni (H. Lynge, 1909) - (NOETIIDAE)
- mortenseni, Cantharidus mortenseni (N.H. Odhner, 1924) - (TROCHIDAE)
- mortenseni, Micrelenchus mortenseni N.H. Odhner, 1924 - syn of: Cantharidus mortenseni (N.H. Odhner, 1924) - (TROCHIDAE)
- mortenseni, Cantharidus mortenseni N.H. Odhner, 1924 - syn of: Cantharidus mortenseni (N.H. Odhner, 1924) - (TROCHIDAE)
- mortenseni caudatinus, Zeatrophon mortenseni caudatinus (N.H. Odhner, 1924) - (MURICIDAE)
- mortenseni caudatinus, Xymene mortenseni caudatinus H.J. Finlay, 1930 - syn of: Zeatrophon mortenseni (N.H. Odhner, 1924) - (MURICIDAE)
- mortenseni caudatinus, Zeatrophon mortenseni caudatinus H.J. Finlay, 1930 - syn of: Zeatrophon mortenseni (N.H. Odhner, 1924) - (MURICIDAE)
- mortensis, Pterinea mortensis Hicks † - (PTERINEIDAE) (FOSSIL)
- morti, Alathyria morti T. Iredale, 1943 - syn of: Alathyria pertexta T. Iredale, 1934 - (HYRIIDAE)
- morti, Laciniorbis morti T. Iredale, 1931 - (TORNIDAE)
- morti, Monilea lentiginosa morti T. Iredale, 1929 - (TROCHIDAE)
- mortiarum, Chondrothyrium mortiarum M.I. Sánchez Roig, 1951 - (POMATIIDAE)
- morticina, Amastra morticina A. Hyatt & H.A. Pilsbry, 1911 - (AMASTRIDAE)
- mortilleti, Ariunculus mortilleti M. Lessona, 1881 - (ARIONIDAE)
- mortilleti, Pseudothurmannia mortilleti (Pictet & de Loriol, 1858 †) - (CRIOCERATITIDAE) (FOSSIL)
- mortilleti, Reynesoceras mortilleti (Meneghini, 1875 †) - (DACTYLIOCERATIDAE) (FOSSIL)
- mortilleti, Oxychilus mortilleti L. Pfeiffer, 1859 - (OXYCHILIDAE)
- mortilleti, Oxyloma mortilleti G. Stabile, 1864 - syn of: Oxyloma elegans (A. Risso, 1826) - (SUCCINEIDAE)
- mortilleti planus, Oxychilus mortilleti planus (S. Clessin, 1877) - (OXYCHILIDAE)
- mortisanensis, Palaeonarica mortisanensis Zardini, 1985 † - syn of: Cassianopsis decussata (Münster, 1841 †) - (PALAEONARICIDAE) (FOSSIL)
- mortoni, Amathina oyamai mortoni W.F. Ponder, 1987 - (AMATHINIDAE)
- mortoni, Astarte mortoni G.B. II Sowerby, 1874 - syn of: Astarte undata Gould, 1841 - (ASTARTIDAE)
- mortoni, Laevicardium mortoni (T.A. Conrad, 1831) - (CARDIIDAE)
- mortoni, Coliracemata mortoni W.F. Ponder, H. Fukuda & A. Hallan, 2014 - (CLENCHIELLIDAE)
- mortoni, Corbicula mortoni M. Huber, 2015 - (CYRENIDAE)
- mortoni, Oxybeloceras mortoni (F.B. Meek & Hayden, 1876 †) - (DIPLOMOCERATIDAE) (FOSSIL)
- mortoni, Eatoniella mortoni W.F. Ponder, 1965 - (EATONIELLIDAE)
- mortoni, Eocypraea mortoni W.M. Gabb, 1860 † - (EOCYPRAEIDAE) (FOSSIL)
- mortoni, Parvioris mortoni A. Warén, 1981 - (EULIMIDAE)
- mortoni, Philoxene mortoni E.G. Linsley & E.L. Yochelson, 1973 † - (EUOMPHALIDAE) (FOSSIL)
- mortoni, Scintilla mortoni C.F. Lützen & C. Nielsen, 2005 - (GALEOMMATIDAE)
- mortoni, Pseudopythina mortoni Goto & Ishikawa, 2016 - (KELLIIDAE)
- mortoni, Rochefortia mortoni P.H. Valentich-Scott, 1998 - (LASAEIDAE)
- mortoni, Lottia mortoni (J.M.J. Christiaens, 1980) - (LOTTIIDAE)
- mortoni, Collisella mortoni J.M.J. Christiaens, 1980 - syn of: Lottia mortoni (J.M.J. Christiaens, 1980) - (LOTTIIDAE)
- mortoni, Cochlis mortoni E. Robba, Pedriali & E. Quaggiotto, 2016 † - (NATICIDAE) (FOSSIL)
- mortoni, Clithon mortoni Symonds, 2015 - (NERITIDAE)
- mortoni, Platevindex mortoni (J.C.Jr. Britton, 1984) - (ONCHIDIIDAE)
- mortoni, Oncis mortoni (J.C.Jr. Britton, 1984) - syn of: Platevindex mortoni (J.C.Jr. Britton, 1984) - (ONCHIDIIDAE)
- mortoni, Amusium mortoni E. Ravenel, 1844 † - (PECTINIDAE) (FOSSIL)
- mortoni, Pseudovermis mortoni D.A. Challis, 1969 - (PSEUDOVERMIDAE)
- mortoni, Rissoa mortoni J.D. Kurtz, 1860 - (RISSOIDAE)
- mortoni, Ellipsoscapha mortoni (E. Forbes, 1845 †) - (SCAPHANDRIDAE) (FOSSIL)
- mortoni, Perissodonta mortoni J. Marwick, 1960 † - (STRUTHIOLARIIDAE) (FOSSIL)
- mortoni, Circulus mortoni W.F. Ponder, 1994 - (TORNIDAE)
- mortoni, Palmerella mortoni (T.A. Conrad, 1830 †) - (TURRITELLIDAE) (FOSSIL)
- mortoni, Quadrula mortoni T.A. Conrad, 1836 - syn of: Amphinaias pustulosa mortoni (T.A. Conrad, 1836) - (UNIONIDAE)
- mortoni, Amphinaias pustulosa mortoni (T.A. Conrad, 1836) - (UNIONIDAE)
- mortoni, Venus mortoni T.A. Conrad, 1837 - syn of: Mercenaria campechiensis (J.F. Gmelin, 1791) - (VENERIDAE)
- mortoni, Livonia mortoni R. Tate, 1889 † - (VOLUTIDAE) (FOSSIL)
- mortoni crassa, Palmerella mortoni crassa Garvie, 2013 † - (TURRITELLIDAE) (FOSSIL)
- mortoni mediavia, Palmerella mortoni mediavia (E. Bowles, 1939 †) - (TURRITELLIDAE) (FOSSIL)
- mortoni mexicana, Palmerella mortoni mexicana Perrilliat & al., 2006 † - (TURRITELLIDAE) (FOSSIL)
- mortoniana, Anodonta mortoniana I. Lea, 1834 - syn of: Anodontites patagonica J.B.P.A. Lamarck, 1819 - (UNIONIDAE)
- Mortoniceras, Genus Mortoniceras Adkins, 1920 † (BRANCOCERATIDAE) (FOSSIL)
- Mortoniceratoides, Genus Mortoniceratoides Cooper , 1982 † (BRANCOCERATIDAE) (FOSSIL)
- mortonicus, Diplodon mortonicus W.L. May, 1923 - syn of: Hyridella narracanensis B.C. Cotton & C.J. Gabriel, 1932 - (HYRIIDAE)
- mortonii, Streblopteria mortonii Johnston, 1887 † - (DELTOPECTINIDAE) (FOSSIL)
- mortonii, Levifusus mortonii (H.C. Lea, 1833 †) - (ECHINOFULGURIDAE) (FOSSIL)
- mortonii, Euconulus mortonii J.G. Jeffreys, 1830 - syn of: Euconulus fulvus (O.F. Müller, 1774) - (EUCONULIDAE)
- mortoniopsis, Levifusus mortoniopsis W.M. Gabb, 1860 † - syn of: Levifusus mortonopsis (W.M. Gabb, 1860 †) - (ECHINOFULGURIDAE) (FOSSIL)
- mortonopsis, Levifusus mortonopsis (W.M. Gabb, 1860 †) - (ECHINOFULGURIDAE) (FOSSIL)
- mortuarium, Farcimen majusculum mortuarium L.O. Alcalde, 1945 - (MEGALOMASTOMIDAE)
- mortuasusensis, Yoldia mortuasusensis Clark & Woodford, 1927 † - (YOLDIIDAE) (FOSSIL)
- mortuorium, Cerion mortuorium C. de la Torre, 1953 - (CERIONIDAE)
- morula, Strophiops morula C.J. Maynard & W.F. Clapp, 1915 - (CERIONIDAE)
- Morula, Genus Morula H.C.F. Schumacher, 1817 (MURICIDAE)
- morula, Pleurobranchaea morula L.S.R. Bergh, 1905 - (PLEUROBRANCHAEIDAE)
- morulifer, Sclerodoris morulifer J.K. Allan, 1932 - syn of: Sclerodoris tuberculata C.N.E. Eliot, 1904 - (DISCODORIDIDAE)
- Morulina, syn of: Subgenus Morula (Azumamorula) W.K. Emerson, 1968 (MURICIDAE)
- morulus, Theodoxus morulus Kühn, 1963 † - (NERITIDAE) (FOSSIL)
- morum, Glycymeris morum (L.A. Reeve, 1843) - (GLYCYMERIDIDAE)
- Morum, Genus Morum P.F. Röding, 1798 (HARPIDAE)
- morum, Drupa morum P.F. Röding, 1798 - (MURICIDAE)
- morum, Murex morum G. Fischer von Waldheim, 1807 - syn of: Morula uva (P.F. Röding, 1798) - (MURICIDAE)
- morum iodostoma, Drupa morum iodostoma (R.P. Lesson, 1840) - (MURICIDAE)
- morundiana, Peristernia morundiana R. Tate, 1888 † - (FASCIOLARIIDAE) (FOSSIL)
- morundiana, Nucula morundiana R. Tate, 1886 † - (NUCULIDAE) (FOSSIL)
- Morunella, syn of: Genus Trachypollia W.P. Woodring, 1928 (MURICIDAE)
- Morurella, syn of: Genus Morula H.C.F. Schumacher, 1817 (MURICIDAE)
- morus, Clypeomorus morus J.B.P.A. Lamarck, 1822 - syn of: Clypeomorus bifasciata (G.B. II Sowerby, 1855) - (CERITHIIDAE)
- morus, Cerithium morus J.G. Bruguière, 1792 - syn of: Batillaria sordida (J.F. Gmelin, 1791) - (CERITHIIDAE)
- morus, Drupa morus J.B.P.A. Lamarck, 1822 - syn of: Morula uva (P.F. Röding, 1798) - (MURICIDAE)
- morus, Morula morus H.A. Pilsbry, 1904 - syn of: Morula japonica (G.B. III Sowerby, 1903) - (MURICIDAE)
- morus borealis, Drupa morus borealis H.A. Pilsbry, 1904 - syn of: Morula japonica (G.B. III Sowerby, 1903) - (MURICIDAE)
- morvenae, Simbirskites morvenae Whitehouse, 1927 † - (POLYPTYCHITIDAE) (FOSSIL)
- Morvillia, syn of: Genus Limneria H. Adams & A. Adams, 1853 (VELUTINIDAE)
- morychus, Viriola morychus F.P. Jousseaume, 1898 - (TRIPHORIDAE)
- morzadeci, Sinuitina morzadeci Blodgett & al., 1999 † - (TROPIDODISCIDAE) (FOSSIL)
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