- mitagensis, Macrocallista mitagensis (S. Kanno, 1958 †) - (VENERIDAE) (FOSSIL)
- mitchellae, Thersites mitchellae J.C. Cox, 1864 - (CAMAENIDAE)
- mitchellae, Modiomorpha mitchellae Cook, 1993 † - (MODIOMORPHIDAE) (FOSSIL)
- mitchelli, Aphanaia mitchelli (McCoy, 1847 †) - (ATOMODESMATIDAE) (FOSSIL)
- mitchelli, Aviculopecten mitchelli Etheridge & Dun, 1906 † - syn of: Deltopecten mitchelli (Etheridge & Dun, 1906 †) - (AVICULOPECTINIDAE) (FOSSIL)
- mitchelli, Drymaeus beyerleanus mitchelli W.H. Dall, 1912 - (BULIMULIDAE)
- mitchelli, Leptopoma mitchelli (E.A. Smith) - (CYCLOPHORIDAE)
- mitchelli, Deltopecten mitchelli (Etheridge & Dun, 1906 †) - (DELTOPECTINIDAE) (FOSSIL)
- mitchelli, Beudanticeras beudanti mitchelli (Etheridge, 1872 †) - (DESMOCERATIDAE) (FOSSIL)
- mitchelli, Amaea mitchelli (W.H. Dall, 1896) - (EPITONIIDAE)
- mitchelli, Nerita mitchelli I.M. Oldroyd, 1933 - syn of: Nerita guamensis J.R.C. Quoy & J.P. Gaimard, 1834 - (NERITIDAE)
- mitchelli, Chaenomya mitchelli P. Morris, 1845 † - syn of: Vacunella curvata (P. Morris, 1845 †) - (PHOLADOMYIDAE) (FOSSIL)
- mitchelli, Pisidium mitchelli B. Prashad, 1925 - (SPHAERIIDAE)
- mitchelli, Macoma mitchelli W.H. Dall, 1895 - (TELLINIDAE)
- mitchelli, Fusconaia mitchelli (W.H. Dall, 1896) - (UNIONIDAE)
- Mitchellia, Genus Mitchellia de Koninck, 1876 (SCOLIOSTOMATIDAE) (FOSSIL)
- mitchelliana, Amplirhagada mitchelliana G.A. Solem, 1981 - (CAMAENIDAE)
- mitchelliana, Fadyenia mitchelliana E. Chitty, 1857 - syn of: Fadyenia baquieana (E. Chitty, 1857) - (HELICINIDAE)
- mitchelliana, Mormula mitchelliana T.H. Aldrich, 1911 † - (PYRAMIDELLIDAE) (FOSSIL)
- mitchellianus, Mesodon mitchellianus H.C. Lea, 1839 - (POLYGYRIDAE)
- mitchellii, Inoceramus mitchellii F. McCoy, 1847 † - syn of: Aphanaia mitchelli (McCoy, 1847 †) - (INOCERAMIDAE) (FOSSIL)
- mitchellii, Sanguinolites mitchellii de Koninck, 1876 † - syn of: Vacunella curvata (P. Morris, 1845 †) - (SANGUINOLITIDAE) (FOSSIL)
- mitchellorum, Contraconus mitchellorum E.J. Petuch, 1994 † - syn of: Contraconus adversarius (T.A. Conrad, 1840 †) - (CONIDAE) (FOSSIL)
- mitchelsoni, Bathytoma mitchelsoni Powell, 1935 † - (BORSONIIDAE) (FOSSIL)
- mite, Cryptometoicoceras mite J. Kennedy & Cobban, 1990 † - (ACANTHOCERATIDAE) (FOSSIL)
- mite, Protacanthoceras tuberculatum mite Wright & J. Kennedy, 1980 † - (ACANTHOCERATIDAE) (FOSSIL)
- mite, Cardioceras mite (S.S. Buckman, 1924 †) - (CARDIOCERATIDAE) (FOSSIL)
- mite, Prionocyclites mite J. Kennedy, 1988 † - (COLLIGNONICERATIDAE) (FOSSIL)
- mitella, Acmaea mitella K.T. Menke, 1847 - syn of: Lottia mitella (K.T. Menke, 1847) - (ACMAEIDAE)
- Mitella, syn of: Genus Calyptraea J.B.P.A. Lamarck, 1799 (CALYPTRAEIDAE)
- mitella, Cyrtonella mitella J.W. Hall, 1859 † - (CYRTOLITIDAE) (FOSSIL)
- mitella, Lottia mitella (K.T. Menke, 1847) - (LOTTIIDAE)
- mitella, Thracia mitella A. De Gregorio, 1884 - syn of: Thracia phaseolina (J.B.P.A. Lamarck, 1818) - (THRACIIDAE)
- mitellapolonica, Cypraecassis mitellapolonica P.F. Röding, 1798 - syn of: Cypraecassis testiculus (C. Linnaeus, 1758) - (CASSIDAE)
- mitescens, Mayaxis mitescens (E.C. Von Martens, 1898) - (SPIRAXIDAE)
- mitgaui, Searlesia mitgaui (A. von Koenen, 1867 †) - (BUCCINIDAE) (FOSSIL)
- mithracoides, Epitornoceras mithracoides (Frech, 1888 †) - (TORNOCERATIDAE) (FOSSIL)
- mithras, Fusinus mithras P.O. Jung, 1965 † - (FASCIOLARIIDAE) (FOSSIL)
- mithrax, Mithraxites mithrax (J.W. Hall, 1860 †) - (GONIATITIDA (UNASSIGNED)) (FOSSIL)
- mithrax, Goniatites mithrax J.W. Hall, 1860 † - syn of: Mithraxites mithrax (J.W. Hall, 1860 †) - (GONIATITIDAE) (FOSSIL)
- Mithraxites, Genus Mithraxites Becker & House, 1994 (GONIATITIDA (UNASSIGNED)) (FOSSIL)
- mithridatis, Nicomedites mithridatis F. Toula, 1896 † - syn of: Nicomedites barbarossae F. Toula, 1896 † - (BEYRICHITIDAE) (FOSSIL)
- miticula, Drupa clathrata miticula J.B.P.A. Lamarck, 1822 - (MURICIDAE)
- miticula, Dosinia miticula J.M.R.M. Viader, 1951 - syn of: Dosinia amphidesmoides (L.A. Reeve, 1850) - (VENERIDAE)
- mitiensis, Acanthohoplites mitiensis M. Collignon, 1962 † - (DESHAYESITIDAE) (FOSSIL)
- mitifica, Sphaerospira mitifica (T. Iredale, 1933) - (CAMAENIDAE)
- mitigata, Xerotricha mitigata A. Mousson, 1872 - syn of: Xerotricha orbignii (A.V.M.D. D'Orbigny, 1836) - (HYGROMIIDAE)
- Mitiperua, Genus Mitiperua C.M. Cooke & Y. Kondo, 1960 (ACHATINELLIDAE)
- mitis, Cuspidaria mitis B. Prashad, 1932 - (CUSPIDARIIDAE)
- mitis, Orthodactylites mitis Buckman, 1927 † - syn of: Orthodactylites directum Buckman, 1926 † - (DACTYLIOCERATIDAE) (FOSSIL)
- mitis, Gaudryceras mitis J. Von Hauer, 1866 † - (GAUDRYCERATIDAE) (FOSSIL)
- mitis, Ctenoides mitis (J.B.P.A. Lamarck, 1807) - (LIMIDAE)
- mitis, Lima mitis J.B.P.A. Lamarck, 1807 - syn of: Ctenoides mitis (J.B.P.A. Lamarck, 1807) - (LIMIDAE)
- mitis, Eastonia mitis C. Mayer, 1867 † - (MACTRIDAE) (FOSSIL)
- mitis, Mactra mitis L.A. Reeve, 1854 - (MACTRIDAE)
- mitis, Paphies mitis (G.P. Deshayes, 1853) - (MESODESMATIDAE)
- mitis, Mesodesma mitis L.A. Reeve, 1854 - syn of: Atactodea striata (J.F. Gmelin, 1791) - (MESODESMATIDAE)
- mitis, Pecten mitis J.B.M. Dana, 1849 † - syn of: Etheripecten leniusculus (J.B.M. Dana, 1847 †) - (PECTINIDAE) (FOSSIL)
- mitis, Pinna mitis Zieten, 1830 † - (PINNIDAE) (FOSSIL)
- mitis, Pinna mitis Arkell, 1931 † - syn of: Pinna mitis Zieten, 1830 † - (PINNIDAE) (FOSSIL)
- mitis, Annularia mitis L. Pfeiffer, 1854 - (POMATIIDAE)
- mitis, Pupina mitis R.B. Hinds - syn of: Pupina keraudrenii M. Vignard, 1829 - (PUPINIDAE)
- mitis, Eulimella mitis P.O. Jung, 1969 † - (PYRAMIDELLIDAE) (FOSSIL)
- mitis, Turbonilla mitis (C.R. Laws, 1937) - (PYRAMIDELLIDAE)
- mitis, Pyrgulina mitis G.S. Coen, 1933 - syn of: Parthenina terebellum (R.A. Philippi, 1844) - (PYRAMIDELLIDAE)
- mitis, Tenagodus multistriatus mitis G.P. Deshayes, 1861 † - (SILIQUARIIDAE) (FOSSIL)
- mitis, Elma mitis P.M. Heude, 1890 - (STREPTAXIDAE)
- mitis, Circulus mitis (G.P. Deshayes, 1862 †) - (TORNIDAE) (FOSSIL)
- mitis, Vasum mitis J.B.P.A. Lamarck, 1822 - syn of: Vasum capitellum (C. Linnaeus, 1758) - (TURBINELLIDAE)
- mitis, Turbinella mitis J.B.P.A. Lamarck, 1822 - syn of: Vasum capitellum (C. Linnaeus, 1758) - (TURBINELLIDAE)
- mitis, Turritella mitis G.P. Deshayes, 1861 † - (TURRITELLIDAE) (FOSSIL)
- mitis, Irus mitis (G.P. Deshayes, 1854) - (VENERIDAE)
- mitis, Venerupis mitis G.P. Deshayes, 1854 - syn of: Irus mitis (G.P. Deshayes, 1854) - (VENERIDAE)
- mitis, Cymbiola mitis J.B.P.A. Lamarck, 1811 - syn of: Cymbiola vespertilio (C. Linnaeus, 1758) - (VOLUTIDAE)
- mitissima, Cassis mitissima A. De Gregorio, 1880 † - (CASSIDAE) (FOSSIL)
- mitjidense, Pisidium mitjidense J.G.J. Kuiper, 1966 - syn of: Pisidium personatum A.W. Malm, 1855 - (SPHAERIIDAE)
- Mitodon, Genus Mitodon F.M. Climo, 1989 (CHAROPIDAE)
- Mitonia, Genus Mitonia Renz & Alvarez, 1979 (ACANTHOCERATIDAE) (FOSSIL)
- Mitorthoceras, Genus Mitorthoceras Gordon, 1960 (PSEUDORTHOCERATIDAE) (FOSSIL)
- mitra, Acmaea mitra J.F. von Eschscholtz, 1833 - (ACMAEIDAE)
- mitra, Archinacella mitra J. Perner, 1903 † - syn of: Archinacellina mitra (J. Perner, 1903 †) - (ARCHINACELLIDAE) (FOSSIL)
- mitra, Amphidromus perversus mitra (C. Linnaeus, 1758) - (CAMAENIDAE)
- mitra, Strophiops mitra C.J. Maynard & W.F. Clapp, 1920 - (CERIONIDAE)
- mitra, Clavatula mitra W. Wood, 1828 - syn of: Clavatula muricata (J.B.P.A. Lamarck, 1822) - (CLAVATULIDAE)
- mitra, Austromitra mitra W.H. Turton, 1932 - syn of: Austromitra kowieensis (G.B. III Sowerby, 1901) - (COSTELLARIIDAE)
- Mitra, syn of: Genus Lampadia R.T. Lowe, 1854 (HELICIDAE)
- Mitra, Genus Mitra J.B.P.A. Lamarck, 1798 (MITRIDAE)
- mitra, Mitra mitra (C. Linnaeus, 1758) - (MITRIDAE)
- mitra, Mitrellatoma mitra R.N. Kilburn, 1986 - syn of: Otitoma mitra (R.N. Kilburn, 1986) - (MITROMORPHIDAE)
- mitra, Terebralia mitra (J.B.P.A. Lamarck, 1804 †) - (POTAMIDIDAE) (FOSSIL)
- mitra, Otitoma mitra (R.N. Kilburn, 1986) - (PSEUDOMELATOMIDAE)
- mitra, Otitoma mitra (R.N. Kilburn, 1986) - syn of: Otitoma mitra (R.N. Kilburn, 1986) - (PSEUDOMELATOMIDAE)
- mitra, Archinacellina mitra (J. Perner, 1903 †) - (TRYBLIDIIDAE) (FOSSIL)
- Mitraconus, Genus Mitraconus J.K. Tucker & M.J. Tenorio, 2013 (CONIDAE)
- mitraeforma, Coralliophila mitraeforma S. Kosuge, 1985 - (MURICIDAE)
- mitraeforme, Cerithium mitraeforme G.B. II Sowerby, 1855 - syn of: Cerithium coralium (L.C. Kiener, 1841) - (CERITHIIDAE)
- mitraeforme, Clypeomorus mitraeforme G.B. II Sowerby, 1855 - syn of: Cerithium coralium (L.C. Kiener, 1841) - (CERITHIIDAE)
- mitraeforme, Epitonium mitraeforme (J. de C. Sowerby, 1844) - (EPITONIIDAE)
- mitraeformis, Cordieria mitraeformis G.P. Deshayes, 1865 - (BORSONIIDAE)
- mitraeformis, Genota mitraeformis W. Wood, 1828 - syn of: Genota mitriformis (W. Wood, 1828) - (BORSONIIDAE)
- mitraeformis, Metula mitraeformis (G.B. Brocchi, 1814 †) - (BUCCINIDAE) (FOSSIL)
- mitraeformis, Brocchinia mitraeformis (G.B. Brocchi, 1814 ) - (CANCELLARIIDAE)
- mitraeformis, Brocchinia mitraeformis Auct. non G.B. Brocchi, 1814 - syn of: Brocchinia clenchi R.E. Petit, 1986 - (CANCELLARIIDAE)
- mitraeformis, Melanopsis mitraeformis N.I. Andrusov, 1909 † - (MELANOPSIDAE) (FOSSIL)
- mitraeformis, Chersomitra mitraeformis (R.J. Shuttleworth, 1852) - (SPIRAXIDAE)
- mitraeformis, Mitraelyria mitraeformis (J.B.P.A. Lamarck, 1811) - (VOLUTIDAE)
- mitraeformis crassicostata, Mitraelyria mitraeformis crassicostata (T.A. Darragh, 1988 †) - (VOLUTIDAE) (FOSSIL)
- mitraeformis grangeri, Mitraelyria mitraeformis grangeri (G.B. III Sowerby, 1900 †) - (VOLUTIDAE) (FOSSIL)
- mitraeformis grockeae, Mitraelyria mitraeformis grockeae (E.J. Petuch & D.P. Berschauer, 2017) - (VOLUTIDAE)
- mitraeformis parvula, Brocchinia mitraeformis parvula (A.H.E. Beyrich, 1856 ) - (CANCELLARIIDAE)
- mitraeformis pupaeformis, Conus mitraeformis pupaeformis G.B. Sowerby, 1870 - syn of: Mitraconus mitratus (C.H. Hwass in J.G. Bruguière, 1792) - (CONIDAE)
- Mitraelyria, Subgenus Lyria (Mitraelyria) P. Bail & G.T. Poppe, 2001 (VOLUTIDAE) (FOSSIL)
- mitraensis, Holospira mitraensis P. Bartsch, 1926 - (UROCOPTIDAE)
- Mitraguraleus, Genus Mitraguraleus C.F. Laseron, 1954 (MANGELIIDAE)
- mitralis, Ceritella mitralis Morris & Lycett † - (CERITELLIDAE) (FOSSIL)
- mitralis, Guraleus mitralis (A. Adams & G.F. Angas, 1864) - (MANGELIIDAE)
- mitralis, Nassa mitralis A. Adams, 1852 - syn of: Nassarius olivaceus (J.G. Bruguière, 1789) - (NASSARIIDAE)
- mitralis, Nassarius mitralis A. Adams, 1852 - syn of: Nassarius olivaceus (J.G. Bruguière, 1789) - (NASSARIIDAE)
- mitralis, Nucula mitralis R.B. Hinds, 1843 - (NUCULIDAE)
- mitralis, Pirenella picta mitralis (K.E.I. von Eichwald, 1830) † - (POTAMIDIDAE) (FOSSIL)
- mitralis, Otopleura mitralis (Adams, 1855) - (PYRAMIDELLIDAE)
- mitralis, Gouldia mitralis Whidborne † - (VENERIDAE) (FOSSIL)
- mitralis australis, Guraleus mitralis australis (A. Adams & G.F. Angas, 1864) - syn of: Guraleus australis (A. Adams & G.F. Angas, 1864) - (MANGELIIDAE)
- Mitramorpha, syn of: Genus Mitromorpha P.P. Carpenter, 1865 (MITROMORPHIDAE)
- mitranus, Fusinus mitranus P.O. Jung, 1965 † - (FASCIOLARIIDAE) (FOSSIL)
- Mitraria, Genus Mitraria C.S. Rafinesque, 1815 (MITRIDAE) (FOSSIL)
- mitrata, Euplica mitrata (K.T. Menke, 1843) - (COLUMBELLIDAE)
- mitrata, Columbella mitrata L.A. Reeve, 1858 - syn of: Parvanachis pygmaea (G.B. I Sowerby, 1832) - (COLUMBELLIDAE)
- mitrata, Propebela mitrata (W.H. Dall, 1919) - (MANGELIIDAE)
- mitrata, Obesotoma mitrata K. Itô, 1985 - syn of: Obesotoma solida (W.H. Dall, 1887) - (MANGELIIDAE)
- mitrata, Oliva mitrata Martin, 1879 † - (OLIVIDAE) (FOSSIL)
- mitrata, Lora mitrata W.H. Dall, 1919 - syn of: Propebela mitrata (W.H. Dall, 1919) - (TURRIDAE)
- mitrata, Pseudaulicina mitrata (G.P. Deshayes, 1835 †) - (VOLUTIDAE) (FOSSIL)
- Mitratoma, Genus Mitratoma Jung, 1971 (TURRIDAE) (FOSSIL)
- mitratus, Mitraconus mitratus (C.H. Hwass in J.G. Bruguière, 1792) - (CONIDAE)
- mitratus, Tectus mitratus G.P. Deshayes, 1832 † - (TEGULIDAE) (FOSSIL)
- Mitravoluta, syn of: Genus Microvoluta G.F. Angas, 1877 (VOLUTOMITRIDAE)
- Mitraxia, syn of: Genus Mitra J.B.P.A. Lamarck, 1798 (MITRIDAE)
- Mitrela, syn of: Genus Mitrella A. Risso, 1826 (COLUMBELLIDAE)
- Mitrela, syn of: Genus Mitrella A. Risso, 1826 (COLUMBELLIDAE)
- mitrella, Bathytoma mitrella (W.H. Dall, 1881) - (BORSONIIDAE)
- mitrella, Metula metula mitrella (A. Adams & L.A. Reeve, 1850) - (BUCCINIDAE)
- mitrella, Tritonoharpa mitrella (A. Adams & L.A. Reeve, 1850) - syn of: Metula metula mitrella (A. Adams & L.A. Reeve, 1850) - (CANCELLARIIDAE)
- Mitrella, Genus Mitrella A. Risso, 1826 (COLUMBELLIDAE)
- mitrella, Volvarina mitrella (A. Risso, 1826) - (MARGINELLIDAE)
- mitrella, Volvarina mitrella Auct. non A. Risso, 1865 - syn of: Volvarina cernita (É.A.A. Locard, 1897) - (MARGINELLIDAE)
- mitrella, Nassa mitrella A. De Gregorio, 1885 † - syn of: Tritia corniculum (A.G. Olivi, 1792 †) - (NASSARIIDAE) (FOSSIL)
- mitrella, Pleurotoma mitrella W.H. Dall, 1881 - syn of: Bathytoma mitrella (W.H. Dall, 1881) - (TURRIDAE)
- mitrella, Voluta mitrella A. Risso, 1826 - syn of: Volvarina mitrella (A. Risso, 1826) - (VOLUTIDAE)
- mitrella, Microvoluta mitrella P. Bouchet & Y.I. Kantor, 2004 - (VOLUTOMITRIDAE)
- mitrella curta, Volvarina mitrella curta T.A. de M. Monterosato, 1884 - syn of: Volvarina mitrella (A. Risso, 1826) - (MARGINELLIDAE)
- mitrellaeformis, Daphnella mitrellaeformis S. Nomura, 1940 - syn of: Daphnella mitrellaformis (S. Nomura, 1940) - (RAPHITOMIDAE)
- mitrellaformis, Daphnella mitrellaformis (S. Nomura, 1940) - (RAPHITOMIDAE)
- Mitrellatoma, Genus Mitrellatoma Powell, 1942 (MITROMORPHIDAE) (FOSSIL)
- Mitrelloturris, Genus Mitrelloturris Eames, 1957 (NEOGASTROPODA (UNASSIGNED)) (FOSSIL)
- mitreola, Olivancillaria mitreola (J.B.P.A. Lamarck, 1802 †) - (OLIVIDAE) (FOSSIL)
- mitreola, Harpulina mitreola (J.B.P.A. Lamarck, 1802 †) - (VOLUTIDAE) (FOSSIL)
- Mitreola, Genus Mitreola Swainson, 1833 (VOLUTOMITRIDAE) (FOSSIL)
- mitreolus, Metula mitreolus (J.P.S. Grateloup, 1833 †) - (BUCCINIDAE) (FOSSIL)
- MITRIDAE Swainson, 1829 - Family (GASTROPODA-CAENOGASTROPODA [Subclass]-NEOGASTROPODA [Order]-MURICOIDEA [Superfamily])
- Mitridomus, Genus Mitridomus Sohl, 1963 (COSTELLARIIDAE) (FOSSIL)
- mitriforme, Cerithium mitriforme W. Wood, 1828 - syn of: Cerithium guinaicum R.A. Philippi, 1849 - (CERITHIIDAE)
- mitriformis, Genota mitriformis (W. Wood, 1828) - (BORSONIIDAE)
- mitriformis, Buccinum mitriformis W. Wood, 1828 - syn of: Genota mitriformis (W. Wood, 1828) - (BUCCINIDAE)
- mitriformis, Hertleinia mitriformis (Sowerby, 1832) - (CANCELLARIIDAE)
- mitriformis, Narona mitriformis G.B. I Sowerby, 1832 - syn of: Hertleinia mitriformis (Sowerby, 1832) - (CANCELLARIIDAE)
- mitriformis, Cancellaria mitriformis G.B. I Sowerby, 1832 - syn of: Hertleinia mitriformis (Sowerby, 1832) - (CANCELLARIIDAE)
- mitriformis, Zafra mitriformis A. Adams, 1860 - (COLUMBELLIDAE)
- mitriformis, Columbella mitriformis P.P. King, 1832 - syn of: Pictocolumbella ocellata (J.H.F. Link, 1807) - (COLUMBELLIDAE)
- mitriformis, Amphorella mitriformis R.T. Lowe, 1852 - (FERUSSACIIDAE)
- mitriformis, Mitromorpha mitriformis (D.R. Shasky, 1961) - (MITROMORPHIDAE)
- mitriformis, Murex mitriformis W. Wood, 1828 - syn of: Genota mitriformis (W. Wood, 1828) - (MURICIDAE)
- mitriformis, Murex mitriformis G.B. Sowerby, 1841 - syn of: Pteropurpura graagae (G.S. Coen, 1943) - (MURICIDAE)
- mitriformis, Proameria mitriformis (G.F. Angas, 1879) - (SPIRAXIDAE)
- Mitriodon, syn of: Subgenus Aspatharia (Chambardia) G. Servain, 1890 (IRIDINIDAE)
- Mitrithara, syn of: Genus Mitromorpha P.P. Carpenter, 1865 (MITROMORPHIDAE)
- Mitroborsonia, Genus Mitroborsonia Chevalier & Anderson, 1964 (BORSONIIDAE) (FOSSIL)
- Mitrocaprina, Genus Mitrocaprina Boehm, 1895 (PLAGIOPTYCHIDAE) (FOSSIL)
- Mitroceras, Genus Mitroceras Hyatt, 1894 (BREVICOCERATIDAE) (FOSSIL)
- mitrodeta, Gymnobela mitrodeta A.V. Sysoev, 1997 - (RAPHITOMIDAE)
- mitrodita, Cancellaria mitrodita J. Gardner, 1937 † - (CANCELLARIIDAE) (FOSSIL)
- mitrodita, Mitrella ischna mitrodita Gardner, 1937 † - (COLUMBELLIDAE) (FOSSIL)
- mitrodita, Mitra mitrodita J. Gardner, 1937 † - (MITRIDAE) (FOSSIL)
- Mitrodrillia, Genus Mitrodrillia (NEOGASTROPODA (UNASSIGNED)) (FOSSIL)
- Mitroidea, syn of: Subgenus Mitra (Dibaphus) R.A. Philippi, 1847 (MITRIDAE)
- Mitrolithes, syn of: Genus Mitra J.B.P.A. Lamarck, 1798 (MITRIDAE)
- Mitrolumna, Subgenus Mitromorpha (Mitrolumna) M.E.J. Bucquoy, P. Dautzenberg & G.F. Dollfus, 1883 (MITROMORPHIDAE)
- Mitromica, Genus Mitromica S.S. Berry, 1958 (COSTELLARIIDAE)
- mitromorpha, Retizafra mitromorpha K. Monsecour & D. Monsecour, 2016 - (COLUMBELLIDAE)
- Mitromorpha, Genus Mitromorpha P.P. Carpenter, 1865 (MITROMORPHIDAE)
- mitromorpha, Naudedrillia mitromorpha R.N. Kilburn, 1988 - (PSEUDOMELATOMIDAE)
- MITROMORPHIDAE Casey, 1904 - Family (GASTROPODA-CAENOGASTROPODA [Subclass]-NEOGASTROPODA [Order]-CONOIDEA [Superfamily])
- mitromorphoides, Borsonia mitromorphoides H.H. Suter, 1917 † - (BORSONIIDAE) (FOSSIL)
- mitroparvus, Gibberulus mitroparvus (F. Sacco, 1893 †) - (STROMBIDAE) (FOSSIL)
- Mitropifex, syn of: Subgenus Vexillum (Costellaria) W.J. Swainson, 1840 (COSTELLARIIDAE)
- Mitropsis, syn of: Genus Anachis H. Adams & A. Adams, 1953 (COLUMBELLIDAE)
- Mitrospira, syn of: Genus Palliseria Wilson, 1924 (MACLURITIDAE) (FOSSIL)
- mitrula, Buccinum mitrula R.W. Dunker, 1849 - syn of: Costoanachis sparsa (L.A. Reeve, 1859) - (BUCCINIDAE)
- Mitrula, syn of: Genus Calyptraea J.B.P.A. Lamarck, 1799 (CALYPTRAEIDAE)
- mitrula, Clavatula mitrula Sowerby, 1822 † - (CLAVATULIDAE) (FOSSIL)
- mitrula, Costoanachis mitrula R.W. Dunker, 1849 - syn of: Costoanachis sparsa (L.A. Reeve, 1859) - (COLUMBELLIDAE)
- mitrula, Hipponix mitrula (J.F. Gmelin, 1791) - (HIPPONICIDAE)
- mitrula, Oenopota mitrula (S.L. Lovén, 1846) - (MANGELIIDAE)
- Mitrula, syn of: Subgenus Neritina (Dostia) J.E. Gray, 1847 (NERITIDAE)
- Mitrularia, syn of: Genus Cheilea Modeer, 1793 (HIPPONICIDAE)
- Mitsella, syn of: Genus Mitrella A. Risso, 1826 (COLUMBELLIDAE)
- mitsikia, Gulella mitsikia K.C. Emberton, 2001 - (STREPTAXIDAE)
- mitsuchii, Ancistrolepis mitsuchii (K. Kanehara †) - (BUCCINIDAE) (FOSSIL)
- mitsuganoense, Pendaloma mitsuganoense (Araki 1959) † - (PERIPLOMATIDAE) (FOSSIL)
- mitsuganoensis, Lyonsiella mitsuganoensis Shibata 1970 † - (LYONSIELLIDAE) (FOSSIL)
- mitsuii, Diaphorodoris mitsuii (K. Baba, 1938) - (ONCHIDORIDIDAE)
- mitsuishii, Cyrtactinoceras mitsuishii T. Kobayashi, 1928 † - (PROTEOCERATIDAE) (FOSSIL)
- mitsukurii, Megalophaedusa mitsukurii (H.A. Pilsbry, 1902) - (CLAUSILIIDAE)
- mitsukurii, Ischnochiton mitsukurii H.A. Pilsbry, 1898 - (ISCHNOCHITONIDAE)
- mitsukurii melinus, Ischnochiton mitsukurii melinus W.H. Dall, 1926 - (ISCHNOCHITONIDAE)
- mittmeyeri, Anetoceras mittmeyeri De Baets & al., 2013 † - (MIMOSPHINCTIDAE) (FOSSIL)
- Mittrea, syn of: Genus Diplodonta H.G. Bronn, 1831 (UNGULINIDAE)
- mittreana, Theodoxus mittreana C.A. Récluz, 1842 - syn of: Theodoxus fluviatilis (C. Linnaeus, 1758) - (NERITIDAE)
- mittrei, Echineulima mittrei (S.A.A. Petit De La Saussaye, 1851) - (EULIMIDAE)
- mittrei, Natica mittrei J.B. Hombron & C.H. Jacquinot, 1853 - syn of: Polinices citrinus (R.A. Philippi, 1851) - (NATICIDAE)
- mituokai, Cirsotrema mituokai (H. Ozaki, 1958) - (EPITONIIDAE)
- mituokai, Epitonium mituokai H. Ozaki, 1958 - syn of: Cirsotrema mituokai (H. Ozaki, 1958) - (EPITONIIDAE)
- mitylena, Cretica cretensis mitylena (J.A. Albers, 1857) - (CLAUSILIIDAE)
- mitzopouloi, Chioceras mitzopouloi Renz & Renz, 1948 † - (MELAGATHICERATIDAE) (FOSSIL)
- mitzopoulosi, Melanopsis mitzopoulosi Papp, 1955 † - syn of: Holandriana gaji (Š. Brusina, 1878 †) - (MELANOPSIDAE) (FOSSIL)
- mitzopoulosi, Canthidomus mitzopoulosi Papp, 1955 † - syn of: Holandriana gaji (Š. Brusina, 1878 †) - (MELANOPSIDAE) (FOSSIL)
- mitzopoulosi, Lithodomus mitzopoulosi Charalambakis, 1952 - syn of: Lithophaga corrugata (R.A. Philippi, 1846) - (MYTILIDAE)
- mitzschii, Turbo mitzschii H.E. Anton, 1839 - syn of: Turbo saxosus W. Wood, 1828 - (TURBINIDAE)
- miuraensis, Arca miuraensis H. Noda, 1966 - syn of: Arca boucardi F.P. Jousseaume, 1894 - (ARCIDAE)
- miuraensis, Megastomia miuraensis (S. Nomura, 1937) - (PYRAMIDELLIDAE)
- miuraensis, Petrasma miuraensis Y. Kanie & T. Kuramochi, 2002 - (SOLEMYIDAE)
- miurana, Turbonilla miurana S. Nomura, 1937 - (PYRAMIDELLIDAE)
- miurensis, Chlamys miurensis Yokoyama, 1920 † - (PECTINIDAE) (FOSSIL)
- miusha, Onchidella miusha Ev. Marcus, 1978 - (ONCHIDIIDAE)
- miveruensis, Filopaludina miveruensis E.A. Smith - (VIVIPARIDAE)
- mixolobus, Prolecanites mixolobus (B. Phillips, 1836 †) - (PROLECANITIDAE) (FOSSIL)
- Mixomanticoceras, Genus Mixomanticoceras Becker & al., 1993 (GEPHUROCERATIDAE) (FOSSIL)
- mixoni, Costaglycymeris mixoni Ward, 1992 † - (GLYCYMERIDIDAE) (FOSSIL)
- Mixosiphonoceras, Genus Mixosiphonoceras Hyatt, 1900 (JOVELLANIIDAE) (FOSSIL)
- mixta, Achatinella mustelina mixta D.A. Welch, 1938 - (ACHATINELLIDAE)
- mixta, Arca mixta Dufour, 1881 † - (ARCIDAE) (FOSSIL)
- mixta, Cancellaria mixta B.M. Landau & al., 2012 † - (CANCELLARIIDAE) (FOSSIL)
- mixta, Cerion mixta (C.J. Maynard & W.F. Clapp, 1921) - (CERIONIDAE)
- mixta, Chaetopleura mixta W.H. Dall, 1919 - syn of: Chaetopleura lanuginosa mixta (W.H. Dall, 1919) - (CHAETOPLEURIDAE)
- mixta, Chaetopleura lanuginosa mixta (W.H. Dall, 1919) - (CHAETOPLEURIDAE)
- mixta, Tonicia mixta W.H. Dall, 1919 - syn of: Chaetopleura lanuginosa mixta (W.H. Dall, 1919) - (CHITONIDAE)
- mixta, Graeca mixta H. Nordsieck, 1984 - (CLAUSILIIDAE)
- mixta, Lottia mixta (L.A. Reeve, 1855) - (LOTTIIDAE)
- mixta, Patelloida mixta T. Iredale, 1924 - syn of: Patelloida mimula T. Iredale, 1924 - (LOTTIIDAE)
- mixta, Hydroginella mixta (W.F. Petterd, 1884) - (MARGINELLIDAE)
- mixta, Serrata mixta W.F. Petterd, 1884 - syn of: Hydroginella mixta (W.F. Petterd, 1884) - (MARGINELLIDAE)
- mixta, Volvarina mixta W.F. Petterd, 1884 - syn of: Hydroginella mixta (W.F. Petterd, 1884) - (MARGINELLIDAE)
- mixta, Mitra mixta J.B.P.A. Lamarck, 1803 † - syn of: Conomitra mixta (J.B.P.A. Lamarck, 1803 †) - (MITRIDAE) (FOSSIL)
- mixta, Orania mixta R. Houart, 1995 - (MURICIDAE)
- mixta, Trigonodesma mixta Mayer-Eymar, 1868 † - (NOETIIDAE) (FOSSIL)
- mixta, Nucula mixta G.P. Deshayes, 1858 † - (NUCULIDAE) (FOSSIL)
- mixta, Septa mixta (A. Arthur & F. García-Talavera, 1990) - (RANELLIDAE)
- mixta, Haurakia mixta Finlay, 1924 † - (RISSOIDAE) (FOSSIL)
- mixta, Rissoa mixta R. Tate, 1899 - syn of: Onoba australiae (G.R. von Frauenfeld, 1867) - (RISSOIDAE)
- mixta, Eopleurotoma mixta F.E. Edwards † - (TURRIDAE) (FOSSIL)
- mixta, Turritella mixta W.H. Dall, 1892 † - (TURRITELLIDAE) (FOSSIL)
- mixta, Cochlodinella mixta (B.H. Wright in L. Pfeiffer, 1865) - (UROCOPTIDAE)
- mixta, Conomitra mixta (J.B.P.A. Lamarck, 1803 †) - (VOLUTOMITRIDAE) (FOSSIL)
- mixta, Perpolita mixta C.A. Westerlund, 1886 - syn of: Perpolita hammonis (H. Strøm, 1765) - (ZONITIDAE)
- mixta inflexa, Graeca mixta inflexa E. Neubert, 1998 - (CLAUSILIIDAE)
- mixta interposita, Graeca mixta interposita H. Nordsieck, 2007 - (CLAUSILIIDAE)
- mixtecum, Parastrenoceras mixtecum Ochoterena, 1963 † - (SPIROCERATIDAE) (FOSSIL)
- Mixtipecten, Genus Mixtipecten Marwick, 1928 (PTERIIDA (UNASSIGNED)) (FOSSIL)
- mixtus, Polymorphites mixtus (F.A. von Quenstedt, 1845 †) - (POLYMORPHITIDAE) (FOSSIL)
- mixtus, Potamides mixtus (J.L.M. Defrance in G.P. Deshayes, 1833 †) - (POTAMIDIDAE) (FOSSIL)
- mixtus, Parasibirites mixtus A.M. Popov, 1962 † - (SIBIRITIDAE) (FOSSIL)
- mixtus, Spondylus gaederopus mixtus F.C.L. Koch & P.M. Pallary, 1900 - (SPONDYLIDAE)
- mixtus, Clanculopsis mixtus E.A. Smith, 1903 - (TROCHIDAE)
- mixtus, Jujubinus mixtus T.A. de M. Monterosato - syn of: Jujubinus exasperatus (T. Pennant, 1777) - (TROCHIDAE)
- mixtus, Stiracolpus mixtus H.J. Finlay, 1930 - syn of: Stiracolpus pagoda (L.A. Reeve, 1849) - (TURRITELLIDAE)
- mixtus, Zeacolpus mixtus H.J. Finlay, 1930 - syn of: Stiracolpus pagoda (L.A. Reeve, 1849) - (TURRITELLIDAE)
- mixtus trivittatus, Potamides mixtus trivittatus G.P. Deshayes, 1864 † - (POTAMIDIDAE) (FOSSIL)
- miyadii, Amnicola miyadii T. Habe, 1942 - (AMNICOLIDAE)
- miyadii, Philine miyadii T. Habe, 1962 - (PHILINIDAE)
- miyadii, Sphaerium miyadii A. Mori, 1933 - (SPHAERIIDAE)
- miyadii, Pisidium miyadii Y.I. Starobogatov & al, 2004 - syn of: Pisidium casertanum (Poli, 1791) - (SPHAERIIDAE)
- miyadii, Stenothyra edogawaensis miyadii J.T. Kuroda, 1962 - (STENOTHYRIDAE)
- miyadii, Maorithyas miyadii T. Habe, 1951 - (THYASIRIDAE)
- miyagiana, Brachystomia miyagiana (S. Nomura, 1936) - (PYRAMIDELLIDAE)
- miyagianus, Retusa miyagianus S. Nomura, 1940 - (RETUSIDAE)
- miyagiensis, Ptychites miyagiensis Bando, 1964 † - (PTYCHITIDAE) (FOSSIL)
- miyagiensis, Pyrgiscilla miyagiensis S. Nomura, 1936 - syn of: Turbonilla aulica (W.H. Dall & P. Bartsch, 1906) - (PYRAMIDELLIDAE)
- miyagiensis, Turbonilla miyagiensis S. Nomura, 1936 - syn of: Turbonilla aulica (W.H. Dall & P. Bartsch, 1906) - (PYRAMIDELLIDAE)
- miyagii, Mekongia miyagii J.T. Kuroda, 1941 - (VIVIPARIDAE)
- Miyagipecten, Subgenus Chlamys (Miyagipecten) Masuda, 1952 (PECTINIDAE) (FOSSIL)
- miyaglana, Acteocina miyaglana S. Nomura, 1939 - (ACTEOCINIDAE)
- miyajiense, Granocardium miyajiense Tashiro 1994 † - (CARDIIDAE) (FOSSIL)
- miyakejimana, Bradybaena miyakejimana H.A. Pilsbry & Y. Hirase, 1903 - (BRADYBAENIDAE)
- miyakejimana, Stereophaedusa tryoni miyakejimana H.A. Pilsbry, 1905 - (CLAUSILIIDAE)
- miyakejimana, Vertigo miyakejimana H.A. Pilsbry & Y. Hirase, 1919 - (VERTIGINIDAE)
- Miyakoceras, Genus Miyakoceras Obata, 1967 (SILESITIDAE) (FOSSIL)
- miyakoensis, Coniglobus mercatorius miyakoensis M. Azuma, 1987 - (CAMAENIDAE)
- miyakoensis, Metazaptyx pattalus miyakoensis (H.A. Pilsbry, 1905) - (CLAUSILIIDAE)
- miyakoensis, Cyclophorus turgidus miyakoensis H.A. Pilsbry & Y. Hirase, 1905 - (CYCLOPHORIDAE)
- miyakoensis, Marshallites miyakoensis Obata & Futakami, 1991 † - (KOSSMATICERATIDAE) (FOSSIL)
- miyakoensis, Pyrgiscus miyakoensis (S. Nomura, 1939) - (PYRAMIDELLIDAE)
- Miyakoia, Subgenus Camaena (Miyakoia) H. Minato, 1980 (CAMAENIDAE)
- miyakoinsularis, Paludinassiminea miyakoinsularis H. Minato, 1980 - (ASSIMINEIDAE)
- miyakojimana, Sinoennea miyakojimana H.A. Pilsbry & Y. Hirase, 1909 - (DIAPHERIDAE)
- miyamoriensis, Guizhoupecten miyamoriensis Murata, 1964 † - (STREBLOCHONDRIIDAE) (FOSSIL)
- miyanagai, Hemizaptyx stimpsoni miyanagai J.T. Kuroda, 1936 - (CLAUSILIIDAE)
- miyanagai, Coneuplecta miyanagai J.T. Kuroda & M. Hukuda, 1944 - (EUCONULIDAE)
- miyata, Neohaustator nipponica miyata Taki & K. Oyama, 1954 † - (TURRITELLIDAE) (FOSSIL)
- miyatensis, Arca miyatensis K. Oyama, 1951 - syn of: Arca boucardi F.P. Jousseaume, 1894 - (ARCIDAE)
- miyatensis, Ophiodermella miyatensis (M. Yokoyama, 1920) - (BORSONIIDAE)
- miyatensis, Tellina miyatensis M. Yokoyama, 1920 - (TELLINIDAE)
- miyatokoensis, Chlamys miyatokoensis S. Nomura & K.M. Hatai, 1937 † - (PECTINIDAE) (FOSSIL)
- miyauchi, Beringius frielei miyauchi W.H. Dall, 1895 - (BUCCINIDAE)
- miyauchii, Buccinum miyauchii M. Azuma, 1972 - (BUCCINIDAE)
- miyazakiensis, Nassarius miyazakiensis T. Shuto, 1962 † - syn of: Tritia casta (A.A. Gould, 1850) - (NASSARIIDAE) (FOSSIL)
- miyazakiensis, Comitas miyazakiensis T. Shuto, 1961 - (PSEUDOMELATOMIDAE)
- miyazakii, Pseudomphala latericea miyazakii (T. Habe, 1943) - (ASSIMINEIDAE)
- miyazakii, Hemiphaedusa miyazakii H. Minato & A. Tada, 1977 - (CLAUSILIIDAE)
- miyazakii, Chamalycaeus miyazakii G. Takahashi & T. Habe, 1973 - (CYCLOPHORIDAE)
- miyitkyinae, Parreysia miyitkyinae F. Haas, 1969 - syn of: Parreysia burmana W.T. Blanford, 1869 - (UNIONIDAE)
- miyokoae, Erosaria miyokoae T. Habe & S. Kosuge, 1970 - syn of: Erosaria turdus (J.B.P.A. Lamarck, 1810) - (CYPRAEIDAE)
- miyokoae, Timbellus miyokoae (S. Kosuge, 1979) - (MURICIDAE)
- miyokoae, Babelomurex miyokoae S. Kosuge, 1985 - (MURICIDAE)
- miyoshii, Clausilia miyoshii J.T. Kuroda & H. Minato, 1979 - (CLAUSILIIDAE)
- miyosii, Megalophaedusa miyosii (J.T. Kuroda, 1955) - (CLAUSILIIDAE)
- miyukiae, Mipus miyukiae S. Kosuge, 1985 - (MURICIDAE)
- mizifio, Cheirodonta mizifio Fernandes & A. Pimenta, 2015 - (TRIPHORIDAE)
- mizius, Lamellaxis mizius Er. Marcus & Ev. Marcus, 1968 - (SUBULINIDAE)
- mizon, Aclis mizon R.B. Watson, 1881 - syn of: Costaclis mizon (R.B. Watson, 1881) - (ACLIDIDAE)
- mizon, Costaclis mizon (R.B. Watson, 1881) - (EULIMIDAE)
- mizrahiae, Volvarina mizrahiae J.A. Ortea, 2014 - (MARGINELLIDAE)
- Mizuhopecten, Genus Mizuhopecten O. Masuda, 1963 (PECTINIDAE)
- mizuna, Conualevia mizuna Er. Marcus & Ev. Marcus, 1967 - (DORIDIDAE)
- mizunamiensis, Schwartziella mizunamiensis (Itoigawa & Nishimoto, 1984) - (ZEBINIDAE)
- mizutanii, Buccinum mizutanii T. Habe & K. Itô, 1970 - (BUCCINIDAE)
- Mjandymoceras, Genus Mjandymoceras Zhuravleva, 1972 (DISCOSORIDA (UNASSIGNED)) (FOSSIL)
- mjatschkovensis, Amaurotoma mjatschkovensis V.N. Sinelnikova, 1970 † - (MICRODOMATIDAE) (FOSSIL)
- mjatschkowanus, Nautilus mjatschkowanus von Loesch, 1914 † - syn of: Paracenoceras mjatschkowanus (von Loesch, 1914 †) - (NAUTILIDAE) (FOSSIL)
- mjatschkowanus, Paracenoceras mjatschkowanus (von Loesch, 1914 †) - (PARACENOCERATIDAE) (FOSSIL)
- mjoela, Cataschisma mjoela (E.L. Yochelson, 1963 †) - (GOSSELETINIDAE) (FOSSIL)
- mjoela, Mourlonia mjoela E.L. Yochelson, 1963 † - syn of: Cataschisma mjoela (E.L. Yochelson, 1963 †) - (GOSSELETINIDAE) (FOSSIL)
- mjoesa, Deacheospira mjoesa (E.L. Yochelson, 1963 †) - (GOSSELETINIDAE) (FOSSIL)
- mjoesense, Allumettoceras mjoesense Sweet, 1958 † - (TRIPTEROCERATIDAE) (FOSSIL)
- mkungwensis, Tanzartemon mkungwensis P. Tattersfield & B. Rowson, 2011 - (STREPTAXIDAE)
- mkuu, Molarella mkuu B. Rowson, M. Seddon & P. Tattersfield, 2009 - (STREPTAXIDAE)
- mletaki, Chondrula mletaki I. Lajtner, 1993 - (ENIDAE)
- mljetica, Spelaeopatula mljetica (I. Pintér & F. Riedel, 1973) - (ZONITIDAE)
- mlokosieviczi, Metalimax mlokosieviczi H.R. Simroth, 1912 - (AGRIOLIMACIDAE)
- mnelense, Cochlostoma sturanii mnelense (A.J. Wagner, 1914) - (COCHLOSTOMATIDAE)
- Mnemoceras, Genus Mnemoceras Zhuravleva, 1974 (ONCOCERIDA (UNASSIGNED)) (FOSSIL)
- Mnestia, Genus Mnestia H. Adams & A. Adams, 1854 (MNESTIIDAE)
- MNESTIDAE - syn of Family: MNESTIIDAE
- MNESTIIDAE Oskars, Bouchet & Malaquias, 2015 - Family (GASTROPODA-HETEROBRANCHIA [Subclass]-OPISTHOBRANCHIA [Infraclass]-CEPHALASPIDEA [Order]-DIAPHANOIDEA [Superfamily])
- Mnestocylichnella, Genus Mnestocylichnella Oppenheim, 1896 (CEPHALASPIDA (UNASSIGNED)) (FOSSIL)
- moa, Amphidromus laevus moa (O.F. Müller, 1774) - (CAMAENIDAE)
- moa, Baluchicardia moa (Gardner, 1935 †) - (CARDITIDAE) (FOSSIL)
- moaense, Chondropoma rufopictum moaense M.I. Sánchez Roig, 1951 - (POMATIIDAE)
- Moala, Subgenus Lamprocystis (Moala) F.C. Baker, 1940 (EUCONULIDAE)
- moalboalensis, Specula moalboalensis A. Cecalupo & I. Perugia, 2012 - (NEWTONIELLIDAE)
- moana, Costellaria moana C.N. Cate, 1963 - syn of: Vexillum leucozonias (G.P. Deshayes in E.S.J.L. de Laborde & M. Linant, 1834) - (COSTELLARIIDAE)
- Moaria, syn of: Genus Sitala H. Adams, 1865 (ARIOPHANTIDAE)
- mobergi, Cyrtodonta mobergi Isberg, 1934 † - (CYRTODONTIDAE) (FOSSIL)
- mobergi, Mesopuzosia mobergi (de Grossouvre, 1894 †) - (DESMOCERATIDAE) (FOSSIL)
- mobergi, Holopea mobergi Troedsson, 1918 † - (HOLOPEIDAE) (FOSSIL)
- mobergi, Cypricardites mobergi Isberg, 1934 † - (KALENTERIDAE) (FOSSIL)
- mobergi, Phragmoceras mobergi Hedstrom, 1917 † - (PHRAGMOCERATIDAE) (FOSSIL)
- mobile, Strophiops mobile C.J. Maynard & W.F. Clapp, 1921 - (CERIONIDAE)
- mobiliana, Praticolella mobiliana (H.C. Lea, 1841) - (POLYGYRIDAE)
- mobilicosta, Pusillina mobilicosta (W.F. Ponder, 1967) - (RISSOIDAE)
- mobilicosta, Haurakia mobilicosta (W.F. Ponder, 1967) - syn of: Pusillina mobilicosta (W.F. Ponder, 1967) - (RISSOIDAE)
- mobilis, Nassarius mobilis (C. Hedley & W.L. May, 1908) - (NASSARIIDAE)
- mobilis costata, Arcularia mobilis costata C. Hedley & W.L. May, 1908 - syn of: Nassarius mobilis (C. Hedley & W.L. May, 1908) - (NASSARIIDAE)
- mobilis plankta, Reticunassa mobilis plankta T. Iredale, 1936 - syn of: Nassarius mobilis (C. Hedley & W.L. May, 1908) - (NASSARIIDAE)
- mobiusi, Calliostoma mobiusi H. Strebel, 1905 - syn of: Calliostoma moebiusi H. Strebel, 1905 - (CALLIOSTOMATIDAE)
- mocambiquense, Sharpeiceras mocambiquense Choffat, 1903 † - (ACANTHOCERATIDAE) (FOSSIL)
- Mocella, Subgenus Flammocharopa (Mocella) T. Iredale, 1915 (CHAROPIDAE)
- mochaensis, Nihonia mochaensis C. Nielsen, 2003 † - (COCHLESPIRIDAE) (FOSSIL)
- mochatinctus, Micrologus mochatinctus K. Fraussen & J. Rosado, 2011 - (BUCCINIDAE)
- mochense, Chondropoma pictum mochense C. de la Torre & P. Bartsch, 1938 - (POMATIIDAE)
- mochensis, Tetrentodon mochensis C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- mocki, Chicoreus mocki M. Beals, 1997 - (MURICIDAE)
- mocquerisi, Gibbula mocquerisi P.M. Pallary, 1912 - syn of: Gibbula varia mocquerisi (P.M. Pallary, 1912) - (TROCHIDAE)
- mocquerisi, Gibbula varia mocquerisi (P.M. Pallary, 1912) - (TROCHIDAE)
- mocsaryi, Pseudamnicola mocsaryi (Š. Brusina, 1902 †) - (HYDROBIIDAE) (FOSSIL)
- moctera, Anodonta moctera G. Servain, 1888 - syn of: Anodonta cygnea (C. Linnaeus, 1758) - (UNIONIDAE)
- moctezumensis, Oxymelania moctezumensis H.A. Pilsbry & A. Hinkley, 1910 - (PACHYCHILIDAE)
- moctezumensis, Actinonaias moctezumensis (H.A. Pilsbry, 1910) - (UNIONIDAE)
- modeli, Peltoceras modeli Peiser, 1937 † - (ASPIDOCERATIDAE) (FOSSIL)
- Modelia, Genus Modelia J.E. Gray, 1850 (TURBINIDAE)
- modelli, Lentidium modelli (Holzl, 1958 †) - (CORBULIDAE) (FOSSIL)
- modelli, Physunio modelli R.A.M. Brandt, 1974 - (UNIONIDAE)
- Modellnaia, Genus Modellnaia R.A.M. Brandt, 1974 (UNIONIDAE)
- modeolaeformis, Gervillella modeolaeformis Cox MS † - (BAKEVELLIIDAE) (FOSSIL)
- moderata, Maoritomella moderata (J. Marwick, 1965 †) - (BORSONIIDAE) (FOSSIL)
- moderata, Albinaria discolor moderata W.A. Fauer, 1993 - (CLAUSILIIDAE)
- moderata, Hormotoma moderata Flower, 1968 † - (MURCHISONIIDAE) (FOSSIL)
- moderatum, Muriceras moderatum Flower, 1964 † - (ELLESMEROCERATIDAE) (FOSSIL)
- moderatus, Nicomedites moderatus McLearn, 1948 † - (BEYRICHITIDAE) (FOSSIL)
- moderatus, Obelus despreauxii moderatus (A. Mousson, 1857) - (COCHLICELLIDAE)
- moderatus, Obeliscus dunkeri moderatus H.A. Pilsbry, 1932 - (SUBULINIDAE)
- moderna, Melanopsis neolithica moderna P.M. Pallary, 1911 - (MELANOPSIDAE)
- modesta, Achatinella modesta C.B. Adams - syn of: Amastra modesta (C.B. Adams, 1851) - (ACHATINELLIDAE)
- modesta, Aclis modesta Meyer, 1886 † - (ACLIDIDAE) (FOSSIL)
- modesta, Berghia modesta S. Trinchese, 1882 - syn of: Berghia coerulescens (C.L. Laurillard, 1832) - (AEOLIDIIDAE)
- modesta, Amastra modesta (C.B. Adams, 1851) - (AMASTRIDAE)
- modesta, Pomacea modesta (G. von dem Busch, 1859) - (AMPULLARIIDAE)
- modesta, Archinacella modesta J. Perner, 1903 † - syn of: Archinacellina modesta (J. Perner, 1903 †) - (ARCHINACELLIDAE) (FOSSIL)
- modesta, Architectonica modesta (R.A. Philippi, 1849) - (ARCHITECTONICIDAE)
- modesta, Assiminea modesta H.C. Lea, 1845 - syn of: Assiminea succinea (L. Pfeiffer, 1840) - (ASSIMINEIDAE)
- modesta, Helicostyla ticaonica modesta O.F. von Möllendorff, 1898 - (BRADYBAENIDAE)
- modesta, Neptunea modesta (Kuroda †) - (BUCCINIDAE) (FOSSIL)
- modesta, Thalassoplanes modesta (E.C. Von Martens, 1885) - (BUCCINIDAE)
- modesta, Searlesia modesta A.A. Gould, 1860 - syn of: Lirabuccinum fuscolabiatum (E.A. Smith, 1875) - (BUCCINIDAE)
- modesta, Bulla modesta A. Risso, 1826 - syn of: Bulla striata J.G. Bruguière, 1792 - (BULLIDAE)
- modesta, Cadlina modesta F.M. MacFarland, 1966 - (CADLINIDAE)
- modesta, Neadmete modesta (P.P. Carpenter, 1864) - (CANCELLARIIDAE)
- modesta, Cancellaria modesta P.P. Carpenter, 1864 - syn of: Neadmete modesta (P.P. Carpenter, 1864) - (CANCELLARIIDAE)
- modesta, Galeodea modesta (H.H. Suter, 1917 †) - (CASSIDAE) (FOSSIL)
- modesta, Clathurella modesta G.F. Angas, 1877 - syn of: Paramontana modesta (G.F. Angas, 1877) - (CLATHURELLIDAE)
- modesta, Cliopsis modesta F.H. Troschel, 1854 - (CLIOPSIDAE)
- modesta, Cliopsis modesta J.P.L. Pelseneer, 1887 - syn of: Cliopsis krohnii F.H. Troschel, 1854 - (CLIOPSIDAE)
- modesta, Cosmioconcha modesta (W.L. Powys, 1835) - (COLUMBELLIDAE)
- modesta, Columbella modesta L.C. Kiener, 1841 - syn of: Columbella adansoni K.T. Menke, 1853 - (COLUMBELLIDAE)
- modesta, Corbula modesta R.B. Hinds, 1843 † - syn of: Anisocorbula taheitensis (J.B.P.A. Lamarck, 1818 †) - (CORBULIDAE) (FOSSIL)
- modesta, Vexillum modesta W.H. Pease, 1867 - syn of: Vexillum gruneri L.A. Reeve, 1844 - (COSTELLARIIDAE)
- modesta, Crassatina modesta (C.B. Adams, 1869) - (CRASSATELLIDAE)
- modesta, Cuthonella modesta (C.N.E. Eliot, 1907) - (CUTHONELLIDAE)
- modesta, Cylichna modesta K.H.J. Thiele, 1925 - (CYLICHNIDAE)
- modesta, Macrodesma modesta Isberg, 1934 † - (CYRTODONTIDAE) (FOSSIL)
- modesta, Palaina modesta J.F. Quadras & O.F. von Möllendorff, 1893 - (DIPLOMMATINIDAE)
- modesta, Montereina modesta (L.S.R. Bergh, 1877) - (DISCODORIDIDAE)
- modesta, Doris modesta L.S.R. Bergh, 1876 - syn of: Doris cuprea C.G. Ehrenberg, 1831 - (DORIDIDAE)
- modesta, Liospira modesta Ulrich & Scofield, 1897 † - (EOTOMARIIDAE) (FOSSIL)
- modesta, Epitonium modesta C.B. Adams, 1845 - syn of: Epitonium venosum (G.B. II Sowerby, 1844) - (EPITONIIDAE)
- modesta, Melanella modesta K.H.J. Thiele, 1930 - (EULIMIDAE)
- modesta, Eulima modesta K.H.J. Thiele, 1925 - (EULIMIDAE)
- modesta, Godiva modesta L.S.R. Bergh, 1880 - syn of: Sakuraeolis japonica (K. Baba, 1937) - (FACELINIDAE)
- modesta, Cratena modesta L.S.R. Bergh, 1880 - syn of: Sakuraeolis japonica (K. Baba, 1937) - (FACELINIDAE)
- modesta, Sakuraeolis modesta L.S.R. Bergh, 1880 - syn of: Sakuraeolis japonica (K. Baba, 1937) - (FACELINIDAE)
- modesta, Hemimarginula modesta (C.B. Adams, 1872) - (FISSURELLIDAE)
- modesta, Glycymeris modesta (G.F. Angas, 1879) - (GLYCYMERIDIDAE)
- modesta, Goniodoris modesta J. Alder & A. Hancock, 1864 - (GONIODORIDIDAE)
- modesta, Okenia modesta A.E. Verrill, 1875 - syn of: Okenia aspersa (J. Alder & A. Hancock, 1845) - (GONIODORIDIDAE)
- modesta, Peruvispira modesta C.O. Waterhouse, 1963 † - (GOSSELETINIDAE) (FOSSIL)
- modesta, Hemicycla modesta (A.E.J. Férussac, 1821) - (HELICIDAE)
- modesta, Hemicycla consobrina modesta (A.E.J. Férussac, 1821) - (HELICIDAE)
- modesta, Raphistomina modesta Ulrich & Scofield, 1897 † - (HOLOPEIDAE) (FOSSIL)
- modesta, Spatha modesta I. Lea, 1864 - syn of: Chambardia petersi (E.C. Von Martens, 1860) - (IRIDINIDAE)
- modesta, Retispira modesta (Girty, 1909 †) - (KNIGHTITIDAE) (FOSSIL)
- modesta, Alderia modesta (S.L. Lovén, 1844) - (LIMAPONTIIDAE)
- modesta, Lithoglyphopsis modesta (P.V. Gredler, 1886) - (LITHOGLYPHIDAE)
- modesta, Echinolittorina modesta (R.A. Philippi, 1846) - (LITTORINIDAE)
- modesta, Fossarilittorina modesta R.A. Philippi, 1846 - syn of: Echinolittorina modesta (R.A. Philippi, 1846) - (LITTORINIDAE)
- modesta, Nodilittorina modesta R.A. Philippi, 1846 - syn of: Echinolittorina modesta (R.A. Philippi, 1846) - (LITTORINIDAE)
- modesta, Lophospira modesta (Billings, 1857 †) - (LOPHOSPIRIDAE) (FOSSIL)
- modesta, Holopella modesta J. Perner, 1903 † - (LOXONEMATIDAE) (FOSSIL)
- modesta, Mulinia modesta (P.P. Carpenter, 1864) - (MACTRIDAE)
- modesta, Mactra modesta P.P. Carpenter, 1864 - syn of: Mulinia modesta (P.P. Carpenter, 1864) - (MACTRIDAE)
- modesta, Mitra modesta L.A. Reeve, 1845 - syn of: Vexillum modestum (L.A. Reeve, 1845) - (MITRIDAE)
- modesta, Saffordia modesta Ulrich, 1894 † - (MODIOMORPHIDAE) (FOSSIL)
- modesta, Murchisonella modesta A. Peñas & E. Rolán, 2013 - (MURCHISONELLIDAE)
- modesta, Pteropurpura modesta (H.C. Fulton, 1936) - (MURICIDAE)
- modesta, Polinella modesta (J. Marwick, 1924 †) - (NATICIDAE) (FOSSIL)
- modesta, Nerita modesta J.B. Hombron & C.H. Jacquinot, 1854 - syn of: Argonerita chamaeleon (C. Linnaeus, 1758) - (NERITIDAE)
- modesta, Ledella modesta K.H.J. Thiele & S.G.A. Jaeckel, 1931 - syn of: Ledella sublevis Verrill & K.J. Bush, 1898 - (NUCULANIDAE)
- modesta, Tricolia modesta A.A. Gould, 1861 - (PHASIANELLIDAE)
- modesta, Eirlysia modesta C.O. Waterhouse, 1986 † - (PHYMATOPLEURIDAE) (FOSSIL)
- modesta, Ferrissia modesta (J.C.H. Crosse, 1880) - (PLANORBIDAE)
- modesta, Platyostoma modesta W.H. Webster, 1906 † - (PLATYCERATIDAE) (FOSSIL)
- modesta, Pleurocera modesta I. Lea, 1860 - (PLEUROCERIDAE)
- modesta, Triopha modesta L.S.R. Bergh, 1880 - syn of: Triopha catalinae (J.G. Cooper, 1863) - (POLYCERIDAE)
- modesta, Polycera modesta S.L. Lovén, 1846 - syn of: Palio dubia (G.O. Sars, 1829) - (POLYCERIDAE)
- modesta, Gari modesta (G.P. Deshayes, 1855) - (PSAMMOBIIDAE)
- modesta, Psammobia modesta G.P. Deshayes, 1855 - syn of: Gari modesta (G.P. Deshayes, 1855) - (PSAMMOBIIDAE)
- modesta, Sulcoliva modesta (A.A. Olsson, 1928 †) - (PSEUDOLIVIDAE) (FOSSIL)
- modesta, Pupina modesta H.C. Fulton, 1906 - (PUPINIDAE)
- modesta, Odostomia modesta G.P. Deshayes, 1861 † - (PYRAMIDELLIDAE) (FOSSIL)
- modesta, Turbonilla modesta (A.V.M.D. D'Orbigny, 1841) - (PYRAMIDELLIDAE)
- modesta, Careliopsis modesta (L. de Folin, 1870) - (PYRAMIDELLIDAE)
- modesta, Monotygma modesta L. de Folin, 1870 - syn of: Careliopsis modesta (L. de Folin, 1870) - (PYRAMIDELLIDAE)
- modesta, Paramontana modesta (G.F. Angas, 1877) - (RAPHITOMIDAE)
- modesta, Rissoina modesta A.A. Gould, 1861 - (RISSOINIDAE)
- modesta, Sarepta modesta Kurushin, 1985 † - (SAREPTIDAE) (FOSSIL)
- modesta, Sinezona modesta (C.B. Adams, 1862) - (SCISSURELLIDAE)
- modesta, Semele modesta (L.A. Reeve, 1853) - (SEMELIDAE)
- modesta, Semele modesta A. Adams, 1854 - syn of: Semele modesta (L.A. Reeve, 1853) - (SEMELIDAE)
- modesta, Dillwynella modesta (W.H. Dall, 1889) - (SKENEIDAE)
- modesta, Macrochilina modesta Girty, 1909 † - (SOLENISCIDAE) (FOSSIL)
- modesta, Perpusilla modesta (L. Pfeiffer, 1862) - (SPIRAXIDAE)
- modesta, Sportella modesta (G.P. Deshayes, 1857 †) - (SPORTELLIDAE) (FOSSIL)
- modesta, Microstrophia modesta (A. Adams, 1867) - (STREPTAXIDAE)
- modesta, Tellina modesta P.P. Carpenter, 1864 - (TELLINIDAE)
- modesta, Terebra modesta J.L.M. Defrance, 1829 - (TEREBRIDAE)
- modesta, Terebra modesta G.P. Deshayes, 1859 - syn of: Hastula matheroniana (G.P. Deshayes, 1859) - (TEREBRIDAE)
- modesta, Thracia modesta G.F. Angas, 1868 - (THRACIIDAE)
- modesta, Vitrinella modesta C.B. Adams, 1852 - (TORNIDAE)
- modesta, Teinostoma modesta W.H. Dall, 1889 - syn of: Dillwynella modesta (W.H. Dall, 1889) - (TORNIDAE)
- modesta, Trapezium modesta G.P. Deshayes in L. Maillard, 1863 - syn of: Trapezium oblongum (C. Linnaeus, 1758) - (TRAPEZIDAE)
- modesta, Marshallora modesta (C.B. Adams, 1850) - (TRIPHORIDAE)
- modesta, Stomatella modesta H. Adams & A. Adams, 1864 - (TROCHIDAE)
- modesta, Calthalotia modesta (K.H.J. Thiele, 1930) - (TROCHIDAE)
- modesta, Archinacellina modesta (J. Perner, 1903 †) - (TRYBLIDIIDAE) (FOSSIL)
- modesta, Bolma modesta (L.A. Reeve, 1843) - (TURBINIDAE)
- modesta, Turridrupa modesta G.B. I Sowerby, 1834 - syn of: Turridrupa cincta (J.B.P.A. Lamarck, 1822) - (TURRIDAE)
- modesta, Anodonta modesta I. Lea, 1857 - syn of: Anodontoides ferussacianus (I. Lea, 1834) - (UNIONIDAE)
- modesta, Tetrentodon modesta (F. Poey, 1858) - (UROCOPTIDAE)
- modesta, Bukobia modesta (C. Pollonera, 1906) - (UROCYCLIDAE)
- modesta, Transennella modesta (W.J. Broderip & G.B. I Sowerby, 1835) - (VENERIDAE)
- modesta, Gouldia modesta H. Adams, 1869 - syn of: Salaputium modestum (H. Adams, 1869) - (VENERIDAE)
- modesta, Dosinia modesta L.A. Reeve, 1850 - syn of: Dosinia lupina (C. Linnaeus, 1758) - (VENERIDAE)
- modesta, Cytherea modesta R.A. Philippi, 1845 - syn of: Pitar inflatus (G.B. II Sowerby, 1851) - (VENERIDAE)
- modesta, Isthmia modesta (T. Say, 1824) - (VERTIGINIDAE)
- modesta, Shaninopsis modesta Isberg, 1934 † - (VLASTIDAE) (FOSSIL)
- modesta, Cymbiola modesta W. Wood, 1828 - syn of: Cymbiola flavicans (J.F. Gmelin, 1791) - (VOLUTIDAE)
- modesta, Enaeta isabellae modesta D.T. Dockery, 1984 † - (VOLUTIDAE) (FOSSIL)
- modesta arctica, Isthmia modesta arctica C. de Wallenberg, 1858 - (VERTIGINIDAE)
- modesta corpulenta, Isthmia modesta corpulenta E.S. Morse, 1865 - (VERTIGINIDAE)
- modesta dimissa, Amastra modesta dimissa A. Hyatt & H.A. Pilsbry, 1911 - (AMASTRIDAE)
- modesta ingersolli, Isthmia modesta ingersolli T.D.A. Cockerell, 1891 - (VERTIGINIDAE)
- modesta krauseana, Vertigo modesta krauseana O.W.H. Reinhardt, 1883 - syn of: Isthmia modesta (T. Say, 1824) - (VERTIGINIDAE)
- modesta ultima, Vertigo modesta ultima H.A. Pilsbry, 1919 - syn of: Isthmia extima (C.A. Westerlund, 1877) - (VERTIGINIDAE)
- Modestella, syn of: Genus Primatrigonia Repin, 2001 (TRIGONIIDAE) (FOSSIL)
- Modesticoncha, Genus Modesticoncha Hautmann, 2009 (TRIGONIIDAE) (FOSSIL)
- Modesticoncha, syn of: Genus Primatrigonia Repin, 2001 (TRIGONIIDAE) (FOSSIL)
- modestina, Abranda modestina (R. Tate, 1891) - (TELLINIDAE)
- modestina, Tellina modestina R. Tate, 1891 - syn of: Abranda modestina (R. Tate, 1891) - (TELLINIDAE)
- modestissima, Murchisonella modestissima A. Peñas & E. Rolán, 2013 - (MURCHISONELLIDAE)
- modestoides, Tethyoceramus modestoides (Sornay 1980) † - (INOCERAMIDAE) (FOSSIL)
- Modestospira, Genus Modestospira Yochelson, 1964 (SINUITIDAE) (FOSSIL)
- modestulum, Calliostoma modestulum H. Strebel, 1908 - (CALLIOSTOMATIDAE)
- modestum, Buccinum modestum W.L. Powys, 1835 - (BUCCINIDAE)
- modestum, Caecum modestum L. de Folin, 1868 - (CAECIDAE)
- modestum, Keenaea modestum A. Adams & L.A. Reeve, 1850 - syn of: Keenaea samarangae (J. Makiyama, 1934) - (CARDIIDAE)
- modestum, Cardium modestum A. Adams & L.A. Reeve, 1850 - syn of: Keenaea samarangae (J. Makiyama, 1934) - (CARDIIDAE)
- modestum, Zuluiceras modestum van Hoepen, 1965 † - (COLLIGNONICERATIDAE) (FOSSIL)
- modestum, Vexillum modestum (L.A. Reeve, 1845) - (COSTELLARIIDAE)
- modestum, Costellaria modestum F.E. Wells & C.W. Bryce, 1985 - syn of: Vexillum rodgersi R. Salisbury & J. Wolff, 2005 - (COSTELLARIIDAE)
- modestum, Salaputium modestum (H. Adams, 1869) - (CRASSATELLIDAE)
- modestum, Ellesmeroceras modestum C.M. Poulsen, 1927 † - (ELLESMEROCERATIDAE) (FOSSIL)
- modestum, Gastrioceras modestum Böse, 1919 † - syn of: Glaphyrites modestus (Böse, 1919 †) - (GASTRIOCERATIDAE) (FOSSIL)
- modestum, Girtyoceras modestum Ruzhentsev & Bogoslovskaya, 1971 † - (GIRTYOCERATIDAE) (FOSSIL)
- modestum, Isohomoceras modestum Ruzhencev & Bogoslovskaya, 1978 † - (HOMOCERATIDAE) (FOSSIL)
- modestum, Stylonema modestum J. Perner, 1907 † - (LOXONEMATIDAE) (FOSSIL)
- modestum, Propinacoceras modestum Leonova, 1992 † - (MEDLICOTTIIDAE) (FOSSIL)
- modestum, Martoceras modestum Bogoslovskaya, 1978 † - (NEOSTACHEOCERATIDAE) (FOSSIL)
- modestum, Orthoceras modestum Ruedemann, 1906 † - (ORTHOCERATIDAE) (FOSSIL)
- modestum, Cyclonema modestum C.M. Poulsen, 1974 † - (PLATYCERATIDAE) (FOSSIL)
- modestum, Platypoma modestum (S.A.A. Petit De La Saussaye, 1850) - (POMATIIDAE)
- modestum, Cyclostoma modestum C.B. Adams, 1849 - syn of: Parachondria wilkinsonii (C.B. Adams, 1849) - (POMATIIDAE)
- modestum, Chaotianoceras modestum J.K. Zhao & Liang, 1974 † - (PSEUDOTIROLITIDAE) (FOSSIL)
- modestum, Euhoploceras modestum (Buckman, 1892 †) - (SONNINIIDAE) (FOSSIL)
- modestum, Tryblidium modestum Ulrich & Scofield, 1897 † - (TRYBLIDIIDAE) (FOSSIL)
- modestum centifilosum, Keenaea modestum centifilosum P.P. Carpenter, 1864 - syn of: Keenaea centifilosum (Carpenter, 1864) - (CARDIIDAE)
- modestum comptum, Vexillum modestum comptum (C.B. Adams, 1853) - (COSTELLARIIDAE)
- modestus, Bostryx modestus (W.J. Broderip, 1832) - (BULIMULIDAE)
- modestus, Joculator modestus A. Cecalupo & I. Perugia, 2012 - (CERITHIOPSIDAE)
- modestus, Hesperocirrus modestus F. Haas, 1953 † - (CIRRIDAE) (FOSSIL)
- modestus, Conus modestus G.B. I Sowerby, 1833 - syn of: Pionoconus fulmen (L.A. Reeve, 1843) - (CONIDAE)
- modestus, Opisthoporus modestus E.C. Von Martens, 1908 - syn of: Opisthoporus euryomphalus (L. Pfeiffer, 1856) - (CYCLOPHORIDAE)
- modestus, Donax modestus A. Risso, 1826 - syn of: Donax venustus G.S. Poli, 1795 - (DONACIDAE)
- modestus, Fusus modestus R.A. Philippi, 1887 † - syn of: Austrotoma echinulata (L.H. Hupé, 1845 †) - (FASCIOLARIIDAE) (FOSSIL)
- modestus, Fusus modestus A.A. Gould, 1860 - syn of: Lirabuccinum fuscolabiatum (E.A. Smith, 1875) - (FASCIOLARIIDAE)
- modestus, Ficus modestus (T.A. Conrad †) - (FICIDAE) (FOSSIL)
- modestus, Glaphyrites modestus (Böse, 1919 †) - (GLAPHYRITIDAE) (FOSSIL)
- modestus, Ocruranus modestus Yü, 1987 † - (HALKIERIIDAE) (FOSSIL)
- modestus, Abbasitoides modestus Vacek, 1886 † - (HAMMATOCERATIDAE) (FOSSIL)
- modestus, Leconteites modestus (Anderson, 1938 †) - (HOPLITIDAE) (FOSSIL)
- modestus, Stiliger modestus S.L. Lovén, 1844 - syn of: Alderia modesta (S.L. Lovén, 1844) - (LIMAPONTIIDAE)
- modestus, Paranautilus modestus (Mojsisovics, 1873 †) - (LIROCERATIDAE) (FOSSIL)
- modestus, Metasibirites modestus Smith, 1927 † - (METASIBIRITIDAE) (FOSSIL)
- modestus, Trophonopsis modestus (G.B. II Sowerby, 1880) - (MURICIDAE)
- modestus, Nassarius modestus K.O. Milaschewitsch, 1909 - syn of: Nassarius nitidus (J.G. Jeffreys, 1867) - (NASSARIIDAE)
- modestus, Nautilus modestus Mojsisovics, 1873 † - syn of: Paranautilus modestus (Mojsisovics, 1873 †) - (NAUTILIDAE) (FOSSIL)
- modestus, Eoasianites modestus Böse, 1919 † - syn of: Glaphyrites modestus (Böse, 1919 †) - (NEOICOCERATIDAE) (FOSSIL)
- modestus, Pecten modestus L.A. Reeve, 1852 - syn of: Pecten fumatus L.A. Reeve, 1852 - (PECTINIDAE)
- modestus, Plicatula modestus L.A. Reeve, 1852 - syn of: Pecten fumatus L.A. Reeve, 1852 - (PLICATULIDAE)
- modestus, Procarnites modestus Tozer, 1965 † - (PROCARNITIDAE) (FOSSIL)
- modestus, Tenagodus modestus (W.H. Dall, 1881) - (SILIQUARIIDAE)
- modestus, Lamellaxis modestus H. Strebel, 1882 - syn of: Lamellaxis martensi modestus (H. Strebel, 1882) - (SUBULINIDAE)
- modestus, Lamellaxis martensi modestus (H. Strebel, 1882) - (SUBULINIDAE)
- modestus, Angulus modestus P.P. Carpenter, 1864 - syn of: Tellina modesta P.P. Carpenter, 1864 - (TELLINIDAE)
- modestus, Circulus modestus (A.A. Gould, 1859) - (TORNIDAE)
- modestus, Turbo modestus R.A. Philippi, 1847 - syn of: Lunella coronatus (J.F. Gmelin, 1791) - (TURBINIDAE)
- modestus, Unio modestus P.M. Heude, 1877 - syn of: Ptychorhynchus murinum (P.M. Heude, 1883) - (UNIONIDAE)
- modestus, Unio modestus H.C. Küster, 1856 - syn of: Diplodon chilensis (J.E. Gray, 1852) - (UNIONIDAE)
- modestus, Unio modestus I. Lea, 1836 - syn of: Diplodon expansus (H.C. Küster, 1853) - (UNIONIDAE)
- modestus, Microceramus modestus C. de la Torre & P. Bartsch, 2008 - (UROCOPTIDAE)
- modestus, Zonyalina modestus (E.C. Von Martens, 1892) - (ZONITIDAE)
- modestus angelmaldonadoi, Bostryx modestus angelmaldonadoi W.K. Weyrauch, 1960 - (BULIMULIDAE)
- modica, Miodomeris modica (G.P. Deshayes, 1858 †) - (CARDITIDAE) (FOSSIL)
- modica, Jeanneretia modica W.J. Clench & C.G. Aguayo, 1951 - (CEPOLIDAE)
- modica, Gibberula modica S. Gofas & F. Fernandes, 1988 - (CYSTISCIDAE)
- modica, Pornosis modica N.F. Sohl, 1964 † - (FASCIOLARIIDAE) (FOSSIL)
- modica, Ludwigella modica Buckman, 1901 † - syn of: Graphoceras modicum (Buckman, 1901 †) - (GRAPHOCERATIDAE) (FOSSIL)
- modica, Anacithara modica (E.A. Smith, 1882) - (HORAICLAVIDAE)
- modica, Melanopsis modica P.M. Pallary, 1928 - (MELANOPSIDAE)
- modica, Nuculana modica B. Prashad, 1932 - (NUCULANIDAE)
- modica, Syrnola modica (G.B. II Sowerby, 1865) - (PYRAMIDELLIDAE)
- modica, Turbonilla modica A. Adams, 1860 - (PYRAMIDELLIDAE)
- modica, Quenstedtia modica (J. Lycett, 1863 †) - (QUENSTEDTIIDAE) (FOSSIL)
- modica, Tellina modica R. von Cosel, 1995 - (TELLINIDAE)
- modica, Teredo modica G.P. Deshayes, 1856 † - (TEREDINIDAE) (FOSSIL)
- modica, Pleurotoma modica E.A. Smith, 1882 - syn of: Anacithara modica (E.A. Smith, 1882) - (TURRIDAE)
- modica, Brachypodella modica C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- modica laevis, Pornosis modica laevis N.F. Sohl, 1964 † - (FASCIOLARIIDAE) (FOSSIL)
- modicella, Amastra modicella C.M. Cooke, 1917 - (AMASTRIDAE)
- modicella, Sinployea modicella (A.E.J. Férussac in G.P. Deshayes, 1840) - (CHAROPIDAE)
- Modicella, syn of: Genus Chondrina Reichenbach, 1828 (CHONDRINIDAE)
- modicella, Eulima modicella A. Adams, 1854 - (EULIMIDAE)
- modicella, Galba modicella (T. Say, 1825) - (LYMNAEIDAE)
- modicellus, Unio modicellus I. Lea, 1859 - syn of: Dysnomia othcaloogensis (I. Lea, 1857) - (UNIONIDAE)
- modicum, Pratulum modicum (J. Marwick, 1944 †) - (CARDIIDAE) (FOSSIL)
- modicum, Graphoceras modicum (Buckman, 1901 †) - (GRAPHOCERATIDAE) (FOSSIL)
- modicus, Pupoides modicus (A.A. Gould, 1848) - (PUPILLIDAE)
- Modiella, Genus Modiella Hall, 1885 (KALENTERIDAE) (FOSSIL)
- Modiella, syn of: Genus Amygdalum J.K. Megerle Von Mόhlfeld, 1811 (MYTILIDAE)
- modificata, Siphonalia modificata (L.A. Reeve, 1846) - (BUCCINIDAE)
- modificata stearnsii, Siphonalia modificata stearnsii H.A. Pilsbry, 1894 - syn of: Siphonalia pseudobuccinum J.C. Melvill, 1888 - (BUCCINIDAE)
- Modioconcha, Genus Modioconcha J. Hall, 1869 (NYASSIDAE) (FOSSIL)
- Modiodesma, syn of: Genus Modiolopsis Hall, 1847 (MODIOMORPHIDAE) (FOSSIL)
- Modiodonta, Genus Modiodonta Liljedahl, 1989 (MODIOMORPHIDAE) (FOSSIL)
- Modiola, syn of: Genus Modiolus J.B.P.A. Lamarck, 1799 (MYTILIDAE)
- modiola, Ondina modiola (T.A. de M. Monterosato, 1884) - (PYRAMIDELLIDAE)
- modiola, Gonospira modiola (A.E.J. Férussac, 1821) - (STREPTAXIDAE)
- Modiolacea, syn of: Genus Musculus P.F. Rφding, 1798 (MYTILIDAE)
- modiolaeformis, Idas modiolaeformis (R. Sturany, 1896) - (MYTILIDAE)
- modiolaeformis, Mytilus edulis modiolaeformis M.E.J. Bucquoy, P. Dautzenberg & G.F. Dollfus, 1889 - (MYTILIDAE)
- modiolaeformis, Stethenodonta modiolaeformis R. Tate, 1896 † - syn of: Sthenodonta eastii (R. Tate, 1896 †) - (NUCULARCIDAE) (FOSSIL)
- Modiolarca, syn of: Genus Gaimardia A. Gould, 1852 (GAIMARDIIDAE)
- modiolare, Cadoceras modiolare W. Smith † - syn of: Tulites modiolaris (W. Smith †) - (CADOCERATIDAE) (FOSSIL)
- modiolare, Modiolopsis modiolare (E. Emmons, 1842 †) - (MODIOMORPHIDAE) (FOSSIL)
- Modiolaria, syn of: Genus Musculus P.F. Rφding, 1798 (MYTILIDAE)
- modiolaris, Modiolopsis modiolaris J.W. Hall 1847 † - (MODIOMORPHIDAE) (FOSSIL)
- modiolaris, Modiolopsis modiolaris (T.A. Conrad, 1838 †) - (MODIOMORPHIDAE) (FOSSIL)
- modiolaris, Crenatula picta modiolaris J.B.P.A. Lamarck, 1819 - (PTERIIDAE)
- modiolaris, Tulites modiolaris (W. Smith †) - (TULITIDAE) (FOSSIL)
- Modiolatus, Genus Modiolatus F.P. Jousseaume, 1893 (MYTILIDAE)
- modiolida, Barbatia modiolida W.P. Woodring, 1925 † - (ARCIDAE) (FOSSIL)
- modioliforma, Ectenagena modioliforma K.J. Boss, 1968 - (VESICOMYIDAE)
- modioliforme, Dacrydium modioliforme K.H.J. Thiele, 1912 - syn of: Dacrydium albidum J.P.L. Pelseneer, 1903 - (MYTILIDAE)
- modioliforme, Eupera modioliforme (H.E. Anton, 1837) - (SPHAERIIDAE)
- Modioliformia, syn of: Genus Barbatia J.E. Gray, 1847 (ARCIDAE)
- modioliformis, Barbatia modioliformis (G.P. Deshayes, 1829 ) - (ARCIDAE)
- modioliformis, Cardiomorpha modioliformis King, 1844 † - syn of: Stutchburia modioliformis (King, 1844 †) - (GRAMMYSIIDAE) (FOSSIL)
- modioliformis, Stutchburia modioliformis (King, 1844 †) - (KALENTERIDAE) (FOSSIL)
- modioliformis, Whiteavesia modioliformis F.B. Meek & A.H. Worthen † - (MODIOMORPHIDAE) (FOSSIL)
- modioliformis, Unio modioliformis I. Lea, 1834 - syn of: Pleurobema clava J.B.P.A. Lamarck, 1819 - (UNIONIDAE)
- modiolina, Gastrochaena modiolina J.B.P.A. Lamarck, 1818 - syn of: Rocellaria dubia (T. Pennant, 1777) - (GASTROCHAENIDAE)
- Modiolina, syn of: Genus Modiolus J.B.P.A. Lamarck, 1799 (MYTILIDAE)
- modiolina, Philobrya modiolina (C. Vélain, 1877) - (PHILOBRYIDAE)
- Modiolites, syn of: Genus Modiolus J.B.P.A. Lamarck, 1799 (MYTILIDAE)
- Modiolodon, Genus Modiolodon Ulrich, 1894 (MODIOMORPHIDAE) (FOSSIL)
- modioloides, Barbatia modioloides (F.J. Cantraine, 1835 †) - (ARCIDAE) (FOSSIL)
- MODIOLOPSIDAE P. Fischer, 1886 - Family (BIVALVIA-PTERIOMORPHIA [Subclass]-MYTILIDA [Order]-MODIOLOPSOIDEA [Superfamily]) (FOSSIL)
- modiolopsis, Congeria modiolopsis N.I. Andrusov, 1897 † - syn of: Andrusoviconcha panticapaea (N.I. Andrusov, 1897 †) - (DREISSENIDAE) (FOSSIL)
- Modiolopsis, Genus Modiolopsis Hall, 1847 (MODIOMORPHIDAE) (FOSSIL)
- Modiolula, Genus Modiolula Sacco, 1897 (MYTILIDAE) (FOSSIL)
- modiolus, Arca modiolus C. Linnaeus, 1767 - syn of: Brachidontes modiolus (C. Linnaeus, 1767) - (ARCIDAE)
- modiolus, Spirotropis modiolus (G.J. De Cristofori & G. Jan, 1832) - (DRILLIIDAE)
- Modiolus, Genus Modiolus J.B.P.A. Lamarck, 1799 (MYTILIDAE)
- modiolus, Brachidontes modiolus (C. Linnaeus, 1767) - (MYTILIDAE)
- modiolus, Modiolus modiolus (C. Linnaeus, 1758) - (MYTILIDAE)
- modiolus, Striarca modiolus G.S. Poli, 1795 - syn of: Striarca lactea (C. Linnaeus, 1758) - (NOETIIDAE)
- modiolus, Philobrya modiolus H.H. Suter, 1913 - (PHILOBRYIDAE)
- modiolus difficilis, Modiolus modiolus difficilis (J.T. Kuroda & T. Habe, 1950) - (MYTILIDAE)
- modiolus kurilensis, Modiolus modiolus kurilensis F.R. Bernard, 1983 - syn of: Modiolus kurilensis F.R. Bernard, 1983 - (MYTILIDAE)
- modiolus minor, Modiolus modiolus minor F. Cailliaud, 1865 - syn of: Modiolus gallicus (P. Dautzenberg, 1895) - (MYTILIDAE)
- modiolus ovata, Modiolus modiolus ovata J.G. Jeffreys, 1864 - syn of: Modiolus modiolus (C. Linnaeus, 1758) - (MYTILIDAE)
- Modiolusia, syn of: Genus Jolya J.R. Bourguignat, 1877 (MYTILIDAE)
- Modiomorpha, Genus Modiomorpha Hall & Whitfield, 1869 (MODIOMORPHIDAE) (FOSSIL)
- MODIOMORPHIDA (UNASSIGNED) - Family (BIVALVIA-HETERODONTA [Subclass]-EUHETERODONTA [Infraclass]-IMPARIDENTIA [Superorder]-MODIOMORPHIDA [Order]) (FOSSIL)
- MODIOMORPHIDAE S.A. Miller, 1877 - Family (BIVALVIA-HETERODONTA [Subclass]-EUHETERODONTA [Infraclass]-IMPARIDENTIA [Superorder]-MODIOMORPHIDA [Order]-MODIOMORPHOIDEA [Super) (FOSSIL)
- modiomorphoides, Sanguinolites modiomorphoides A.W. Grabau, 1931 † - (SANGUINOLITIDAE) (FOSSIL)
- Modiomytilus, Genus Modiomytilus Griffin, 1990 (MYTILIDA (UNASSIGNED)) (FOSSIL)
- modjokasriense, Tonna modjokasriense K. Martin, 1899 - syn of: Tonna galea (C. Linnaeus, 1758) - (TONNIDAE)
- modoci, Fluminicola modoci H.B. Hannibal, 1912 - (LITHOGLYPHIDAE)
- Modonitor, syn of: Genus Nitor G.P.L.K. Gude, 1911 (HELICARIONIDAE)
- modulaides, Modiolus modulaides (P.F. Röding, 1798) - (MYTILIDAE)
- modulaides, Musculus modulaides P.F. Röding, 1798 - syn of: Modiolus modulaides (P.F. Röding, 1798) - (MYTILIDAE)
- Modularia, syn of: Genus Musculus P.F. Rφding, 1798 (MYTILIDAE)
- modulata, Pyrostoma attenuata modulata (A. Schmidt, 1857) - (CLAUSILIIDAE)
- modulata, Mesoginella modulata (C.F. Laseron, 1957) - (MARGINELLIDAE)
- modulatum, Paragastrioceras modulatum Ruzhentsev, 1956 † - (PARAGASTRIOCERATIDAE) (FOSSIL)
- modulatus, Lyropecten modulatus L.G. Hertlein, 1925 † - (PECTINIDAE) (FOSSIL)
- MODULIDAE P. Fischer, 1884 - Family (GASTROPODA-CAENOGASTROPODA [Subclass]-CERITHIOIDEA [Superfamily])
- Modulus, Genus Modulus J.E. Gray, 1842 (MODULIDAE)
- modulus, Modulus modulus (C. Linnaeus, 1758) - (MODULIDAE)
- modulus, Musculus modulus P.F. Röding, 1798 - syn of: Modiolus modiolus (C. Linnaeus, 1758) - (MYTILIDAE)
- modulus, Trochus modulus C. Linnaeus, 1758 - syn of: Modulus modulus (C. Linnaeus, 1758) - (TROCHIDAE)
- modulus, Axinolobus modulus W.J. Gordon, 1960 † - (WELLERITIDAE) (FOSSIL)
- modulus floridanus, Modulus modulus floridanus T.A. Conrad, 1869 - (MODULIDAE)
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