- meyendorffi, Douvilleiceras meyendorffi (A.V.M.D. D'Orbigny, 1845 †) - (DOUVILLEICERATIDAE) (FOSSIL)
- meyendorffi, Coralliophila meyendorffi R.A. Philippi, 1836 - syn of: Babelomurex tectumsinensis (G.P. Deshayes, 1856) - (MURICIDAE)
- meyendorffii, Coralliophila meyendorffii (P. Calcara, 1845) - (MURICIDAE)
- meyendorffii elongata, Coralliophila meyendorffii elongata F. Settepassi, 1977 - syn of: Coralliophila meyendorffii (P. Calcara, 1845) - (MURICIDAE)
- meyendorffii inflata, Coralliophila meyendorffii inflata F. Settepassi, 1977 - syn of: Coralliophila meyendorffii (P. Calcara, 1845) - (MURICIDAE)
- meyendorffii serrata, Coralliophila meyendorffii serrata F. Settepassi, 1977 - syn of: Coralliophila meyendorffii (P. Calcara, 1845) - (MURICIDAE)
- meyendorffii squamulata, Coralliophila meyendorffii squamulata F. Settepassi, 1977 - syn of: Coralliophila meyendorffii (P. Calcara, 1845) - (MURICIDAE)
- meyendorfi, Hormotoma meyendorfi E.F.R.K. Koken, 1897 † - (MURCHISONIIDAE) (FOSSIL)
- meyeni, Loy meyeni A.V. Martynov, 1994 - (CORAMBIDAE)
- meyeri, Partulina tessellata meyeri F. Borcherding, 1901 - (ACHATINELLIDAE)
- meyeri, Ammonites meyeri Klipstein, 1843 † - syn of: Sphingites meyeri (Klipstein, 1843 †) - (AMMONITIDA (unassigned)) (FOSSIL)
- meyeri, Disoketa meyeri Gardner, 1880 † - (APORRHAIDAE) (FOSSIL)
- meyeri, Arcestes meyeri Klipstein, 1843 † - syn of: Sphingites meyeri (Klipstein, 1843 †) - (ARCESTIDAE) (FOSSIL)
- meyeri, Proveniella meyeri (Woods) † - (ARCTICIDAE) (FOSSIL)
- meyeri, Calliostoma meyeri R.A. Philippi, 1848 - syn of: Astele armillata (W. Wood, 1828) - (CALLIOSTOMATIDAE)
- meyeri, Obba marginata meyeri O.F. von Möllendorff, 1896 - (CAMAENIDAE)
- meyeri, Cerithium meyeri Klipstein, 1843 † - syn of: Zygopleura hybrida (Münster, 1841 †) - (CERITHIIDAE) (FOSSIL)
- meyeri, Chama meyeri I.H. Jonas, 1846 - syn of: Chama pacifica W.J. Broderip, 1835 - (CHAMIDAE)
- meyeri, Splinoconus biliosus meyeri (J.G. Walls, 1979) - (CONIDAE)
- meyeri, Abderospira meyeri K.V.W. Palmer, 1937 † - (CYLICHNIDAE) (FOSSIL)
- meyeri, Ransoniella meyeri L. Dolin, 2007 - syn of: Notadusta punctata (C. Linnaeus, 1771) - (CYPRAEIDAE)
- meyeri, Scalaria meyeri Gardner † - (EPITONIIDAE) (FOSSIL)
- meyeri, Fusinus meyeri (R.W. Dunker, 1869) - (FASCIOLARIIDAE)
- meyeri, Emarginula meyeri Gardner † - (FISSURELLIDAE) (FOSSIL)
- meyeri, Helix ligata meyeri W. Kobelt, 1906 - (HELICIDAE)
- meyeri, Panopea meyeri Woods † - (HIATELLIDAE) (FOSSIL)
- meyeri, Geltena meyeri R. Casey, 1961 † - (MACTRIDAE) (FOSSIL)
- meyeri, Mnestia meyeri A.E.M. Cossmann, 1893 † - (MNESTIIDAE) (FOSSIL)
- meyeri, Samoana meyeri J.B. Burch, 2007 - (PARTULIDAE)
- meyeri, Helcion meyeri Gardner † - (PATELLIDAE) (FOSSIL)
- meyeri, Pleurotomaria meyeri Klipstein, 1843 † - syn of: Rinaldoella subgranulata (Münster, 1841 †) - (PLEUROTOMARIIDAE) (FOSSIL)
- meyeri, Pyramidella meyeri A.E.M. Cossmann, 1893 † - (PYRAMIDELLIDAE) (FOSSIL)
- meyeri, Ervilia meyeri T.H. Aldrich, 1911 † - (SEMELIDAE) (FOSSIL)
- meyeri, Ilanga meyeri (R.A. Philippi, 1848) - (SOLARIELLIDAE)
- meyeri, Solariella meyeri R.N. Kilburn, 1973 - syn of: Ilanga biradiatula (E.C. Von Martens, 1902) - (SOLARIELLIDAE)
- meyeri, Sphingites meyeri (Klipstein, 1843 †) - (SPHINGITIDAE) (FOSSIL)
- meyeri, Apolymetis meyeri (R.A. Philippi, 1846) - (TELLINIDAE)
- meyeri, Tritonia meyeri J.B. Vérany, 1862 - syn of: Marionia blainvillea (A. Risso, 1818) - (TRITONIIDAE)
- meyeri, Marionia meyeri J.B. Vérany, 1852 - syn of: Marionia blainvillea (A. Risso, 1818) - (TRITONIIDAE)
- meyeri, Trochus meyeri R.A. Philippi, 1848 - syn of: Astele armillata (W. Wood, 1828) - (TROCHIDAE)
- meyeri, Turbo meyeri Münster, 1843 † - syn of: Tunstallia helicina (von Schlotheim, 1820 †) - (TURBINIDAE) (FOSSIL)
- Meyeria, syn of: Genus Metzgeria A. Norman, 1879 (PTYCHATRACTIDAE)
- meyeriana, Cancilla meyeriana R. Salisbury, 1992 - (MITRIDAE)
- meyeriana, Sandalia meyeriana (C.N. Cate, 1973) - (OVULIDAE)
- meynardi, Panopea meynardi G.P. Deshayes, 1828 † - (HIATELLIDAE) (FOSSIL)
- meynardi, Bolma meynardi (O.G. Michelotti, 1847 †) - (TURBINIDAE) (FOSSIL)
- meynardi?, Panopea meynardi? G.P. Deshayes, 1828 - (HIATELLIDAE)
- meyrarguense, Bythiospeum diaphanum meyrarguense H. Girardi, 2009 - (HYDROBIIDAE)
- Meyrargueria, Genus Meyrargueria H. Girardi, 2009 (HYDROBIIDAE)
- meyrati, Baculites meyrati Ooster, 1860 † - syn of: Euptychoceras meyrati (Ooster, 1860 †) - (BACULITIDAE) (FOSSIL)
- meyrati, Euptychoceras meyrati (Ooster, 1860 †) - (BOCHIANITIDAE) (FOSSIL)
- meyrati, Cenoceras meyrati (Ooster, 1858 †) - (CENOCERATIDAE) (FOSSIL)
- meyrati, Hamulina meyrati (Ooster, 1860) - (HAMULINIDAE)
- meyrati, Ptychoceras meyrati Ooster, 1860 † - syn of: Euptychoceras meyrati (Ooster, 1860 †) - (PTYCHOCERATIDAE) (FOSSIL)
- mezeribensis, Melanopsis cerithiopsis mezeribensis P.M. Pallary, 1939 - (MELANOPSIDAE)
- mezhvilki, Bulunites mezhvilki Andrianov, 1985 † - (PARAGASTRIOCERATIDAE) (FOSSIL)
- mezquitalensis, Cubitostrea mezquitalensis R.L. Squires & Demetrion, 1990 † - (OSTREIDAE) (FOSSIL)
- mezquitalensis, Batequeus mezquitalensis R.L. Squires & Demetrion, 1990 † - (PECTINIDAE) (FOSSIL)
- mezzalirai, Coxesia mezzalirai Mendes 1952 † - (MYTILIDA (UNASSIGNED)) (FOSSIL)
- mezzaro, Ocythoe mezzaro A. Risso, 1854 - syn of: Tremoctopus violaceus S. Delle Chiaje, 1830 - (OCYTHOIDAE)
- mfamosingi, Costigulella mfamosingi O.C. Oke, 2013 - (STREPTAXIDAE)
- mfisense, Acutimitoceras mfisense Bockwinkel & Ebbighausen, 2006 † - (GATTENDORFIIDAE) (FOSSIL)
- mgatschensis, Corbicula mgatschensis Ilyina, 1957 ex Simonova MS † - (CYRENIDAE) (FOSSIL)
- miae, Setia miae A. Verduin, 1988 - (RISSOIDAE)
- miagkovae, Moyerokania miagkovae Rozov, 1970 † - (SCENELLIDAE) (FOSSIL)
- miamensis, Pomacea miamensis H.A. Pilsbry, 1899 - syn of: Pomacea paludosa (T. Say, 1829) - (AMPULLARIIDAE)
- miamia, Inodrillia miamia P. Bartsch, 1943 - (HORAICLAVIDAE)
- miamica, Myurellina miamica A.A. Olsson, 1967 † - (TEREBRIDAE) (FOSSIL)
- miamiensis, Pomacea miamiensis H.A. Pilsbry, 1899 - (AMPULLARIIDAE)
- miamiensis, Pyrazisinus miamiensis E.J. Petuch, 1994 † - (BATILLARIIDAE) (FOSSIL)
- miamiensis, Hesperisternia miamiensis E.J. Petuch, 1991 † - (BUCCINIDAE) (FOSSIL)
- miamiensis, Calliostoma miamiensis E.J. Petuch, 1994 † - (CALLIOSTOMATIDAE) (FOSSIL)
- miamiensis, Cancellaria miamiensis E.J. Petuch, 1994 † - (CANCELLARIIDAE) (FOSSIL)
- miamiensis, Conus miamiensis E.J. Petuch, 1986 † - (CONIDAE) (FOSSIL)
- miamiensis, Guppya miamiensis H.A. Pilsbry, 1903 - (EUCONULIDAE)
- miamiensis, Heilprinia miamiensis E.J. Petuch, 1994 † - (FASCIOLARIIDAE) (FOSSIL)
- miamiensis, Polyschides miamiensis (J. Henderson, 1920) - (GADILIDAE)
- miamiensis, Cuneamya miamiensis J.W. Hall & R.P. Whitfield, 1875 † - (GRAMMYSIIDAE) (FOSSIL)
- miamiensis, Ctenoides miamiensis P.M. Mikkelsen & R. Bieler, 2003 - (LIMIDAE)
- miamiensis, Urosalpinx miamiensis E.J. Petuch, 1994 † - (MURICIDAE) (FOSSIL)
- miamiensis, Chicoreus miamiensis E.J. Petuch, 1994 † - (MURICIDAE) (FOSSIL)
- miamiensis, Subpterynotus miamiensis E.J. Petuch, 1994 † - (MURICIDAE) (FOSSIL)
- miamiensis, Liguus fasciatus miamiensis C.T. Simpson, 1920 - (ORTHALICIDAE)
- miamiensis, Cyphoma miamiensis E.J. Petuch, 1986 - (OVULIDAE)
- miamiensis, Pusula miamiensis E.J. Petuch, 1991 † - (TRIVIIDAE) (FOSSIL)
- miamiensis, Turritella miamiensis E.J. Petuch, 1994 † - (TURRITELLIDAE) (FOSSIL)
- Miamira, Genus Miamira L.S.R. Bergh, 1874 (CHROMODORIDIDAE)
- miamirana, Miamira miamirana (L.S.R. Bergh, 1875) - (CHROMODORIDIDAE)
- miamirana, Miamira miamirana L.S.R. Bergh, 1875 - syn of: Miamira miamirana (L.S.R. Bergh, 1875) - (CHROMODORIDIDAE)
- Miamoceras, Genus Miamoceras Flower, 1946 † (ONCOCERATIDAE) (FOSSIL)
- mianchiensis, Shaanxiconcha mianchiensis (Zhang, 1977 †) - (SHAANXICONCHIDAE) (FOSSIL)
- Mianwaliites, Genus Mianwaliites Brühwiler & Bucher, 2012 † (PALAEOPHYLLITIDAE) (FOSSIL)
- miaocunensis, Nuculana miaocunensis C. Chen, 1976 † - (NUCULANIDAE) (FOSSIL)
- miaphene, Acicula miaphene P. Subai, 2009 - (ACICULIDAE)
- miara, Chloritis miara J.F. Mabille - (CAMAENIDAE)
- miara, Helix miara J.F. Mabille, 1887 - syn of: Chloritis insularis O.F. von Möllendorff, 1901 - (HELICIDAE)
- miara stenomphala, Chloritis miara stenomphala A.R.J.B. Bavay & P. Dautzenberg, 1909 - (CAMAENIDAE)
- miaranoniae, Gulella miaranoniae K.C. Emberton, 2001 - (STREPTAXIDAE)
- miaryi, Cyclotopsis miaryi (E. Fischer-Piette, Ch.P. Blanc, F. Blanc & F. Salvat, 1993) - (POMATIIDAE)
- miaulis, Littoridina miaulis Er. Marcus & Ev. Marcus, 1965 - (COCHLIOPIDAE)
- mica, Vexillum mica (L.A. Reeve, 1845) - (COSTELLARIIDAE)
- mica, Costellaria mica L.A. Reeve, 1845 - syn of: Vexillum mica (L.A. Reeve, 1845) - (COSTELLARIIDAE)
- mica, Opalia mica G. Schmelz & R. Portell, 2007 † - (EPITONIIDAE) (FOSSIL)
- mica, Stachella mica Yu, 1980 † - syn of: Stachella micra Yu, 1980 † - (EUPHEMITIDAE) (FOSSIL)
- mica, Okenia mica J.A. Ortea & L. Moro, 2014 - (GONIODORIDIDAE)
- mica, Pseudotryonia mica R. Hershler, H.X. Liu & J.J. Landye, 2011 - (HYDROBIIDAE)
- mica, Cincinnatia mica F.G. Thompson, 1968 - (HYDROBIIDAE)
- mica, Kuschelita mica F.M. Climo, 1974 - (HYDROBIIDAE)
- mica, Leucozonella mica (N.L. Tzvetkova, 1950) - (HYGROMIIDAE)
- mica, Nozeba mica H.J. Finlay, 1930 - syn of: Nozeba emarginata (F.W. Hutton, 1885) - (IRAVADIIDAE)
- mica, Neolauria mica A.A. Schileyko, 1998 - (LAURIIDAE)
- mica, Mangelia mica (R.A. Philippi, 1849) - (MANGELIIDAE)
- mica, Mitra mica L.A. Reeve, 1845 - syn of: Vexillum mica (L.A. Reeve, 1845) - (MITRIDAE)
- mica, Olivella mica (P.L. Duclos, 1835) - (OLIVELLIDAE)
- mica, Porphyria mica P.F. Röding, 1798 - syn of: Oliva oliva (C. Linnaeus, 1758) - (OLIVIDAE)
- mica, Segmentina mica C.A. Westerlund, 1883 - syn of: Polypylis nitidella (E.C. Von Martens, 1877) - (PLANORBIDAE)
- mica, Pleurotomaria mica Girty, 1909 † - (PLEUROTOMARIIDAE) (FOSSIL)
- mica, Vitrea mica C.A. Westerlund, 1886 - syn of: Vitrea contracta (C.A. Westerlund, 1871) - (PRISTILOMATIDAE)
- micaceus, Delectopecten micaceus (P. Dautzenberg & A.R.J.B. Bavay, 1912) - (PECTINIDAE)
- micaceus, Catillopecten micaceus P. Dautzenberg & A.R.J.B. Bavay, 1912 - syn of: Delectopecten micaceus (P. Dautzenberg & A.R.J.B. Bavay, 1912) - (PROPEAMUSSIIDAE)
- micaceus, Cyclopecten micaceus P. Dautzenberg & A.R.J.B. Bavay, 1912 - syn of: Delectopecten micaceus (P. Dautzenberg & A.R.J.B. Bavay, 1912) - (PROPEAMUSSIIDAE)
- micaela, Bizetiella micaela G.E. Radwin & D'Attilio, 1972 - (MURICIDAE)
- micaelae, Horologica micaelae A. Cecalupo & I. Perugia, 2012 - (CERITHIOPSIDAE)
- micalii, Anatoma micalii D.L. Geiger, 2012 - (ANATOMIDAE)
- micalii, Goodallia micalii G. Giribet & A. Peñas, 1999 - (ASTARTIDAE)
- micalii, Cerithiopsis micalii (A. Cecalupo & A. Villari, 1997) - (CERITHIOPSIDAE)
- micalii, Joculator micalii A. Cecalupo & I. Perugia, 2012 - (CERITHIOPSIDAE)
- micalii, Ebala micalii (A. Peñas & E. Rolán, 2001) - (MURCHISONELLIDAE)
- micalii, Pyrgulina micalii E. Robba, 2013 † - (PYRAMIDELLIDAE) (FOSSIL)
- micalii, Turbonilla micalii A. Peñas & E. Rolán, 2010 - (PYRAMIDELLIDAE)
- micalii, Sayella micalii A. Peñas & E. Rolán, 1997 - syn of: Pyramidella dolabrata (C. Linnaeus, 1758) - (PYRAMIDELLIDAE)
- micalii, Tiberia micalii A. Peñas & E. Rolán, 1997 - syn of: Pyramidella dolabrata (C. Linnaeus, 1758) - (PYRAMIDELLIDAE)
- micalli, Goodallia micalli G. Giribet & A. Peñas, 1999 - syn of: Goodallia micalii G. Giribet & A. Peñas, 1999 - (ASTARTIDAE)
- Micana, syn of: Genus Olivella W.J. Swainson, 1831 (OLIVELLIDAE)
- micanopy, Conus micanopy E.J. Petuch, 1994 † - (CONIDAE) (FOSSIL)
- micans, Tornatellina micans A. Garrett, 1879 - syn of: Tubuaia affinis (A. Garrett, 1879) - (ACHATINELLIDAE)
- micans, Achatinella micans L. Pfeiffer - syn of: Amastra micans L. Pfeiffer, 1859 - (ACHATINELLIDAE)
- micans, Amastra micans L. Pfeiffer, 1859 - (AMASTRIDAE)
- micans, Chloraea micans (L. Pfeiffer, 1845) - (BRADYBAENIDAE)
- micans, Eatonina micans (W.H. Webster, 1905) - (CINGULOPSIDAE)
- micans, Argalista micans A.W.B. Powell, 1931 - (COLLONIIDAE)
- micans, Globidrillia micans (R.B. Hinds, 1843) - (DRILLIIDAE)
- micans, Guppya micans (G.F. Angas, 1879) - (EUCONULIDAE)
- micans, Melanella micans (H.F. Carpenter, 1865) - (EULIMIDAE)
- micans, Eulima micans H.F. Carpenter, 1865 - syn of: Melanella micans (H.F. Carpenter, 1865) - (EULIMIDAE)
- micans, Eulima micans J.E. Tenison-Woods, 1875 - syn of: Eulima tenisoni G.W. Tryon, 1886 - (EULIMIDAE)
- micans, Emarginula micans A. Adams, 1852 - (FISSURELLIDAE)
- micans, Kellia micans R. Tate, 1887 † - (KELLIIDAE) (FOSSIL)
- micans, Cyclostrema micans A. Adams, 1850 - syn of: Pseudoliotia micans (A. Adams, 1850) - (LIOTIIDAE)
- micans, Margarites micans P. Dautzenberg & P. Fischer, 1889 - (MARGARITIDAE)
- micans, Volvarina micans (S.A.A. Petit De La Saussaye, 1851) - (MARGINELLIDAE)
- micans, Strigatella micans L.A. Reeve, 1845 - syn of: Strigatella typha L.A. Reeve, 1845 - (MITRIDAE)
- micans, Arcoperna micans (A. Braun, 1851 †) - (MYTILIDAE) (FOSSIL)
- micans, Cellana micans P.F. Röding, 1798 - syn of: Cellana cylindrica (J.F. Gmelin, 1791) - (NACELLIDAE)
- micans, Zeuxis micans A. Adams, 1852 - syn of: Nassarius unicolor (J.B. Hombron & C.H. Jacquinot, 1848) - (NASSARIIDAE)
- micans, Theodoxus micans (Gaudry & Fischer in Gaudry, 1867 †) - (NERITIDAE) (FOSSIL)
- micans, Nuculana micans (S.C.T. Hanley, 1860) - (NUCULANIDAE)
- micans, Leda micans H. Adams & A. Adams, 1858 - syn of: Nuculana micans (S.C.T. Hanley, 1860) - (NUCULANIDAE)
- micans, Nucula micans G.F. Angas, 1879 - syn of: Nucula pusilla G.F. Angas, 1877 - (NUCULIDAE)
- micans, Sigmataxis micans (C.B. Adams, 1849) - (OLEACINIDAE)
- micans, Olivancillaria micans Bezancon, 1870 † - (OLIVIDAE) (FOSSIL)
- micans, Partula micans L. Pfeiffer, 1853 - (PARTULIDAE)
- micans, Patella micans P.F. Röding, 1798 - syn of: Cellana cylindrica (J.F. Gmelin, 1791) - (PATELLIDAE)
- micans, Pendaloma micans (C. Hedley, 1901) - (PERIPLOMATIDAE)
- micans, Gari micans (V. Bertin, 1880) - (PSAMMOBIIDAE)
- micans, Turbonilla micans (T.A. de M. Monterosato, 1875) - (PYRAMIDELLIDAE)
- micans, Rissoina micans A. Adams, 1853 - (RISSOINIDAE)
- micans, Solariella micans P. Dautzenberg & H. Fischer, 1896 - (SOLARIELLIDAE)
- micans, Pulvinus micans (S.C.T. Hanley, 1844) - (TELLINIDAE)
- micans, Tellina micans S.C.T. Hanley, 1844 - syn of: Pulvinus micans (S.C.T. Hanley, 1844) - (TELLINIDAE)
- micans, Hastula micans (R.B. Hinds, 1844) - (TEREBRIDAE)
- micans, Pseudoliotia micans (A. Adams, 1850) - (TORNIDAE)
- micans, Inella micans (R.B. Hinds, 1843) - (TRIPHORIDAE)
- micans, Notosinister micans C.F. Laseron, 1958 - (TRIPHORIDAE)
- micans, Gibbula micans H.H. Suter, 1897 - syn of: Cantharidus artizona (A. Adams, 1853) - (TROCHIDAE)
- micans, Anodon micans J.G. Anthony, 1865 - syn of: Anodonta grandis T. Say, 1829 - (UNIONIDAE)
- micans bollenensis, Theodoxus micans bollenensis (C.F. Fontannes, 1879 †) - (NERITIDAE) (FOSSIL)
- micans borealis, Melanella micans borealis P. Bartsch, 1917 - syn of: Melanella borealis P. Bartsch, 1917 - (EULIMIDAE)
- micans minoriformis, Theodoxus micans minoriformis Papp in Papp & Thenius, 1952 † - (NERITIDAE) (FOSSIL)
- micans rubricatus, Theodoxus micans rubricatus (J. Almera, 1894 †) - (NERITIDAE) (FOSSIL)
- Micantapex, Genus Micantapex T. Iredale, 1936 (BORSONIIDAE)
- Micardista, syn of: Genus Sphaerospira O.A.L. Mörch, 1867 (CAMAENIDAE)
- micaria, Mitromorpha micaria C. Hedley, 1912 - syn of: Pygmaeconus micarius (C. Hedley, 1912) - (MITROMORPHIDAE)
- micarius, Pygmaeconus micarius (C. Hedley, 1912) - (CONIDAE)
- Micasarcina, Genus Micasarcina Squires & Saul, 2003 † (FASCIOLARIIDAE) (FOSSIL)
- Micatheca, Genus Micatheca Sysoev, 1972 †) (ALLATHECIDAE) (FOSSIL)
- Micatula, syn of: Genus Plicatula J.B.P.A. Lamarck, 1801 (PLICATULIDAE)
- Miccocephalites, Genus Miccocephalites Buckman, 1929 † (CADOCERATIDAE) (FOSSIL)
- miccosukee, Pyruella miccosukee E.J. Petuch, 1994 † - (BUSYCONIDAE) (FOSSIL)
- miccosukee, Massyla miccosukee E.J. Petuch, 1994 † - (CANCELLARIIDAE) (FOSSIL)
- miccosukee, Eurypyrene miccosukee E.J. Petuch, 1991 † - (COLUMBELLIDAE) (FOSSIL)
- miccosukee, Conus miccosukee Abbott, 1988 † - (CONIDAE) (FOSSIL)
- miccosukee, Pusula miccosukee (E.J. Petuch, 1991) - (TRIVIIDAE)
- micculus, Alveinus micculus Gardner, 1926 † - syn of: Alveinus rotundus W.H. Dall, 1900 † - (KELLIELLIDAE) (FOSSIL)
- miccyla, Pupisoma miccyla (W.H. Benson, 1860) - (VERTIGINIDAE)
- micelii, Cirna micelii (W. Kobelt, 1885) - (ENIDAE)
- micella, Pleuromeris micella A.A. Olsson & J.T.L. McGinty, 1958 - (CARDITIDAE)
- micellus, Cardites micellus (L. Penna-Neme, 1971) - (CARDITIDAE)
- miceui, Drouetia miceui Frias Martins, 1989 - (OXYCHILIDAE)
- michael, Angeloteuthis michael H.G. Lang, 1928 † - (PASSALOTEUTHIDIDAE) (FOSSIL)
- michaelae, Ondina michaelae C. Cachia & C. Mifsud, 2015 - (PYRAMIDELLIDAE)
- michaeli, Hallaxa michaeli T.M. Gosliner & S. Johnson, 1994 - (ACTINOCYCLIDAE)
- michaeli, Chromodoris michaeli T.M. Gosliner & D.W. Behrens, 1998 - (CHROMODORIDIDAE)
- michaeli, Alopia canescens michaeli R. von Kimakowicz, 1966 - (CLAUSILIIDAE)
- michaeli, Siphopteron michaeli (T.M. Gosliner & J.D. Williams, 1988) - (GASTROPTERIDAE)
- michaeli, Lithoglyphus acutus michaeli Cobalcescu, 1883 † - (LITHOGLYPHIDAE) (FOSSIL)
- michaeli, Farcimen gundlachi michaeli L.O. Alcalde, 1946 - (MEGALOMASTOMIDAE)
- michaeli, Ocinebra michaeli J. Ford, 1888 - syn of: Urosalpinx subangulata (R.E.C. Stearns, 1873) - (MURICIDAE)
- michaeli, Murphitys michaeli W.P. Popenoe & Saul, 1987 † - (PERISSITYIDAE) (FOSSIL)
- michaeli, Syrnola michaeli J.E. Tenison-Woods, 1877 - (PYRAMIDELLIDAE)
- michaeli, Biplica michaeli W.P. Popenoe, 1957 † - (RINGICULIDAE) (FOSSIL)
- michaeli, Tjaernoeia michaeli W. Engl, 2002 - (TJAERNOEIIDAE)
- michaeli, Gongylostoma michaeli C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- michaelianum, Vexillum michaelianum R. Salisbury, 2011 - (COSTELLARIIDAE)
- michaelis, Costellaria michaelis T. Iredale, 1929 - syn of: Vexillum exasperatum (J.F. Gmelin, 1791) - (COSTELLARIIDAE)
- michaelis, Lyncina michaelis J.C. Melvill, 1905 - syn of: Lyncina lynx (C. Linnaeus, 1758) - (CYPRAEIDAE)
- michaelis, Danubites michaelis (Mojsisovics, 1882 †) - (DANUBITIDAE) (FOSSIL)
- michaelis, Opisthostoma michaelis W.S.S. Van Benthem-Jutting, 1952 - (DIPLOMMATINIDAE)
- michaelis, Lobogenes michaelis H.A. Pilsbry & C.E. Beecher, 1927 - (HYDROBIIDAE)
- michaelis, Natica michaelis E. Fischer-Piette, 1942 - (NATICIDAE)
- michaelis, Turbonilla michaelis J.C. Melvill, 1910 - (PYRAMIDELLIDAE)
- Michaelisia, Subgenus Turcomilax (Michaelisia) I.M. Likharev, 1980 (LIMACIDAE)
- michaelkingi, Phenacovolva michaelkingi C.N. Cate, 1973 - syn of: Phenacovolva lahainaensis (C.N. Cate, 1969) - (OVULIDAE)
- michaelkingi, Simnia michaelkingi C.N. Cate, 1973 - syn of: Phenacovolva lahainaensis (C.N. Cate, 1969) - (OVULIDAE)
- michaelleae, Bythiospeum michaelleae H. Girardi, 2002 - (HYDROBIIDAE)
- michaellensis, Bythiospeum diaphanum michaellensis H. Girardi, 2002 - (HYDROBIIDAE)
- michaelrogersi, Fusinus michaelrogersi D.R. Goodwin, 2001 - (FASCIOLARIIDAE)
- michaelsarsi, Peracle michaelsarsi K.E.H. Bonnevie, 1913 - syn of: Pneumodermopsis michaelsarsi (K.E.H. Bonnevie, 1913) - (PERACLIDAE)
- michaelsarsi, Cephalopyge michaelsarsi K.E.H. Bonnevie, 1921 - syn of: Cephalopyge trematoides (C. Chun, 1889) - (PHYLLIROIDAE)
- michaelsarsi, Pneumodermopsis michaelsarsi (K.E.H. Bonnevie, 1913) - (PNEUMODERMATIDAE)
- michaelseni, Pareuthria michaelseni (H. Strebel, 1905) - (BUCCINIDAE)
- michaelseni, Bittium michaelseni H. Strebel, 1905 - syn of: Eumetula michaelseni (H. Strebel, 1905) - (CERITHIIDAE)
- michaelseni, Amphidoxa michaelseni (H. Strebel, 1907) - (CHAROPIDAE)
- michaelseni, Cryptoplax michaelseni K.H.J. Thiele, 1911 - (CRYPTOPLACIDAE)
- michaelseni, Austrodoris michaelseni N.H. Odhner, 1926 - syn of: Doris kerguelenensis (L.S.R. Bergh, 1884) - (DORIDIDAE)
- michaelseni, Mangelia michaelseni (H. Strebel, 1905) - (MANGELIIDAE)
- michaelseni, Bela michaelseni H. Strebel, 1905 - syn of: Mangelia michaelseni (H. Strebel, 1905) - (MANGELIIDAE)
- michaelseni, Eumetula michaelseni (H. Strebel, 1905) - (NEWTONIELLIDAE)
- michaelseni, Thesbia michaelseni (H. Strebel, 1905) - (RAPHITOMIDAE)
- michaelseni, Daphnella michaelseni H. Strebel, 1905 - syn of: Thesbia michaelseni (H. Strebel, 1905) - (RAPHITOMIDAE)
- michaelsoni, Pareuthria michaelsoni H. Strebel, 1905 - syn of: Pareuthria michaelseni (H. Strebel, 1905) - (BUCCINIDAE)
- michahellis, Delima latilabris michahellis (H.C. Küster, 1850) - (CLAUSILIIDAE)
- michaillensis, Costatomphalus michaillensis (Pictet & Campiche, 1863 †) - (LIOTIIDAE) (FOSSIL)
- michaillensis, Monopleura michaillensis Pictet & Campiche, 1868 † - (MONOPLEURIDAE) (FOSSIL)
- michaillensis, Bleytonella michaillensis (Pictet & Campiche, 1862 †) - (PICKWORTHIIDAE) (FOSSIL)
- michaillensis, Pileolus michaillensis Pictet & Campiche, 1863 † - (PILEOLIDAE) (FOSSIL)
- michaillensis, Turbo michaillensis Pictet & Campiche, 1862 † - syn of: Bleytonella michaillensis (Pictet & Campiche, 1862 †) - (TURBINIDAE) (FOSSIL)
- michailovae, Imerites michailovae Kakabadze, 1971 † - (HEMIHOPLITIDAE) (FOSSIL)
- michailowskii, Pseudofagotia michailowskii V.V. Anistratenko, 1993 † - (MELANOPSIDAE) (FOSSIL)
- Michaletia, Genus Michaletia Cossmann, 1903 † (TROCHIDAE) (FOSSIL)
- michalkovaci, Pseudochloritis michalkovaci (Binder & Harzhauser in Harzhauser & al., 2008) † - (ELONIDAE) (FOSSIL)
- michalkovaci, Pleurodonte michalkovaci E.E. Binder & M. Harzhauser, 2008 † - (PLEURODONTIDAE) (FOSSIL)
- Michalskia, Genus Michalskia † (AMMONOIDEA (UNASSIGNED)) (FOSSIL)
- michalskii, Semenoviceras michalskii (Semenov, 1899 †) - (HOPLITIDAE) (FOSSIL)
- michalskii, Chanasia michalskii Lewinski † - (OPPELIIDAE) (FOSSIL)
- michalskii, Polyptychites michalskii Bogoslowsky, 1902 † - (POLYPTYCHITIDAE) (FOSSIL)
- michaocanensis, Cymia michaocanensis Perrilliat, 1987 † - (MURICIDAE) (FOSSIL)
- michardi, Lyria michardi (P. Bail, 2009) - (VOLUTIDAE)
- michardi, Indolyria michardi P. Bail, 2009 - syn of: Lyria michardi (P. Bail, 2009) - (VOLUTIDAE)
- michaudae, Armenoceras michaudae Bolton & Nowlan, 1979 † - (ARMENOCERATIDAE) (FOSSIL)
- michaudi, Acroloxus michaudi (É.A.A. Locard, 1878 †) - (ACROLOXIDAE) (FOSSIL)
- michaudi, Aporrhais michaudi É.A.A. Locard, 1888 - syn of: Aporrhais pespelicani (C. Linnaeus, 1758) - (APORRHAIDAE)
- michaudi, Serrulastra michaudi H. Nordsieck, 1981 † - (CLAUSILIIDAE) (FOSSIL)
- michaudi, Draparnaudia michaudi R.P. Montrouzier, 1859 - (DRAPARNAUDIIDAE)
- michaudi, Carychiopsis michaudi (De Boissy, 1848) † - (ELLOBIIDAE) (FOSSIL)
- michaudi, Haliotis michaudi É.A. Benoist, 1884 † - syn of: Sulculus benoisti A.E.M. Cossmann, 1896 † - (HALIOTIDAE) (FOSSIL)
- michaudi, Bythiospeum michaudi (É.A.A. Locard, 1882) - (HYDROBIIDAE)
- michaudi, Lemniscia michaudi (G.P. Deshayes, 1830) - (HYGROMIIDAE)
- michaudi, Margaritifera michaudi É.A.A. Locard, 1889 - syn of: Margaritifera margaritifera (C. Linnaeus, 1758) - (MARGARITIFERIDAE)
- michaudi, Lartetia michaudi É.A.A. Locard, 1882 - syn of: Bythiospeum michaudi (É.A.A. Locard, 1882) - (MOITESSIERIIDAE)
- michaudi, Sigaretotrema michaudi (O.G. Michelotti, 1847 †) - (NATICIDAE) (FOSSIL)
- michaudi, Clithon michaudi (C.A. Récluz, 1841) - (NERITIDAE)
- michaudi, Pharella michaudi F. Cailliaud, 1839 - syn of: Pharella javanica (J.B.P.A. Lamarck, 1818) - (PHARIDAE)
- michaudi, Tropidophora michaudi (J.P.S. Grateloup, 1840) - (POMATIIDAE)
- michaudi, Raphitoma michaudi (L.M.D. Bellardi, 1877 †) - (RAPHITOMIDAE) (FOSSIL)
- michaudi, Rissoina michaudi D.E. Desjardin, 1949 - syn of: Schwartziella bryerea (G. Montagu, 1803) - (RISSOINIDAE)
- michaudi, Succinea michaudi É.A.A. Locard, 1878 - syn of: Succinella oblonga (J.P.R. Draparnaud, 1801) - (SUCCINEIDAE)
- michaudi, Trochus michaudi H.M.D. de Blainville, 1830 - syn of: Gibbula philberti (C.A. Récluz, 1843) - (TROCHIDAE)
- michaudi, Valvata michaudi G.P. Deshayes, 1862 † - (VALVATIDAE) (FOSSIL)
- michaudi, Vermetus michaudi C. Rousseau & J.C. Chenu, 1844 † - syn of: Vermetus carmatus C. Rousseau & J.C. Chenu, 1844 † - (VERMETIDAE) (FOSSIL)
- michaudi clausula, Sigaretotrema michaudi clausula F. Sacco, 1890 † - syn of: Sigaretotrema michaudi (O.G. Michelotti, 1847 †) - (NATICIDAE) (FOSSIL)
- michaudi eunaticinoides, Sigaretotrema michaudi eunaticinoides F. Sacco, 1890 † - syn of: Sigaretotrema michaudi (O.G. Michelotti, 1847 †) - (NATICIDAE) (FOSSIL)
- michaudi pseudoaquensis, Sigaretotrema michaudi pseudoaquensis F. Sacco, 1890 † - syn of: Sigaretotrema michaudi (O.G. Michelotti, 1847 †) - (NATICIDAE) (FOSSIL)
- Michaudia, Subgenus Alabastrina (Michaudia) P.M. Pallary, 1926 (HELICIDAE)
- michaudia, Helix michaudia A. Moquin-Tandon, 1855 - syn of: Chilostoma fontenillii alpinum (A. Michaud, 1831) - (HELICIDAE)
- michaudiana, Acicula michaudiana Schlickum, 1975 † - (ACICULIDAE) (FOSSIL)
- michaudiana, Alinda biplicata michaudiana (L. Pfeiffer, 1848) - (CLAUSILIIDAE)
- michaudiana, Cypraea michaudiana J.P.S. Grateloup, 1847 † - syn of: Apiocypraea michaudiana (J.P.S. Grateloup, 1847 †) - (CYPRAEIDAE) (FOSSIL)
- michaudiana, Apiocypraea michaudiana (J.P.S. Grateloup, 1847 †) - (EOCYPRAEIDAE) (FOSSIL)
- michaudiana, Pseudosubulina michaudiana (A.V.M.D. D'Orbigny, 1842) - (SPIRAXIDAE)
- michaudii, Rupestrella michaudii (A. Terver, 1839) - (CHONDRINIDAE)
- michaui, Anachis michaui J.C.H. Crosse & P.H. Fischer, 1863 - syn of: Zafra ornata (W.H. Pease, 1868) - (COLUMBELLIDAE)
- michaui, Vexillum michaui (J.C.H. Crosse & P.H. Fischer, 1864) - (COSTELLARIIDAE)
- michaui, Mitra michaui J.C.H. Crosse & P.H. Fischer, 1864 - syn of: Vexillum michaui (J.C.H. Crosse & P.H. Fischer, 1864) - (MITRIDAE)
- michaui, Fissilabia michaui J.C.H. Crosse & P.H. Fischer, 1863 - syn of: Fissilabia decollata (J.R.C. Quoy & J.P. Gaimard, 1833) - (PLANAXIDAE)
- michaui, Oophana michaui (J.C.H. Crosse & P.H. Fischer, 1863) - (STREPTAXIDAE)
- michaui intertaeniatum, Costellaria michaui intertaeniatum G.B. II Sowerby, 1874 - syn of: Vexillum intertaeniatum (G.B. II Sowerby, 1874) - (COSTELLARIIDAE)
- michaui wilsi, Costellaria michaui wilsi J.A. Buijse & H. Dekker, 1990 - (COSTELLARIIDAE)
- Michela, Genus Michela Gardner , 1945 † (TURRIDAE) (FOSSIL)
- michelae, Pseudobaicalia michelae T.Y. Sitnikova & Kovalenkova, 2016 - (AMNICOLIDAE)
- michelae, Marginella michelae T. Cossignani, 2012 - (MARGINELLIDAE)
- michelae, Siratus michelae R. Houart & J. Colomb, 2012 - (MURICIDAE)
- michelae, Tanganyicia michelae (A. West, 1999) - (PALUDOMIDAE)
- michelae, Redonia michelae Babin, 1982 † - (REDONIIDAE) (FOSSIL)
- micheleae, Nucula micheleae Marincovich Jr., 1993 † - (NUCULIDAE) (FOSSIL)
- micheli, Ovatella micheli H. Mittre, 1841 - syn of: Auriculinella bidentata (G. Montagu, 1808) - (ELLOBIIDAE)
- micheli elongata, Leuconia micheli elongata P.M. Pallary, 1900 - syn of: Myosotella myosotis (J.P.R. Draparnaud, 1801) - (ELLOBIIDAE)
- micheli incrassata, Leuconia micheli incrassata P.M. Pallary, 1900 - syn of: Myosotella myosotis (J.P.R. Draparnaud, 1801) - (ELLOBIIDAE)
- Michelia, Genus Michelia Roemer, 1855 † (MURCHISONIIDAE) (FOSSIL)
- michelii, Abida michelii H.C. Küster, 1847 - syn of: Abida secale (J.P.R. Draparnaud, 1801) - (CHONDRINIDAE)
- michelini, Hemicyclonosta michelini J.L.H. Michelin, 1828 † - (CARDILIIDAE) (FOSSIL)
- michelini, Cardites michelini A. Valenciennes in A. Dupetit-Thouars, 1846 - syn of: Cardites crassicostatus (G.B. I Sowerby, 1825) - (CARDITIDAE)
- michelini, Cardita michelini A. Valenciennes, 1846 - syn of: Cardites crassicostatus (G.B. I Sowerby, 1825) - (CARDITIDAE)
- michelini, Turricula michelini G.P. Deshayes, 1865 † - (CLAVATULIDAE) (FOSSIL)
- michelini, Carychium michelini (De Boissy, 1848) † - (ELLOBIIDAE) (FOSSIL)
- michelini, Michelinoceras michelini (Barrande, 1866 †) - (MICHELINOCERATIDAE) (FOSSIL)
- michelini, Maralsenia michelini (Coquand, 1862 †) - (PSEUDOLIVIDAE) (FOSSIL)
- michelini, Sulcobuccinum michelini Coquand, 1862 † - syn of: Maralsenia michelini (Coquand, 1862 †) - (PSEUDOLIVIDAE) (FOSSIL)
- michelinianus, Protohoplites michelinianus (A.V.M.D. D'Orbigny, 1841 †) - (HOPLITIDAE) (FOSSIL)
- michelinii, Nebularia michelinii F.E. Guérin-Méneville, 1831 - syn of: Nebularia aurantia (J.F. Gmelin, 1791) - (MITRIDAE)
- Michelinoceras, Genus Michelinoceras Foerste, 1932 † (MICHELINOCERATIDAE) (FOSSIL)
- MICHELINOCERATIDAE Flower, 1945 † - Family (CEPHALOPODA-ORTHOCERATOIDEA [Subclass]-ORTHOCERIDA [Order]) (FOSSIL)
- MICHELINOCERATINAE - syn of Family: MICHELINOCERATIDAE (FOSSIL)
- Micheliopsis, Genus Micheliopsis Termier & Termier, 1977 † (ARCHAEOGASTROPODA (UNASSIGNED)) (FOSSIL)
- michellae, Reticulapex michellae K.C. Emberton, 2010 - (CHAROPIDAE)
- michellae, Gulella michellae K.C. Emberton, 2001 - (STREPTAXIDAE)
- micheloi, Erosaria turdus micheloi M. Chiapponi, 2009 - (CYPRAEIDAE)
- micheloti, Oxynaia micheloti (L.J. Morlet, 1886) - (UNIONIDAE)
- micheloti hedeius, Oxynaia micheloti hedeius (J.F. Mabille, 1889) - (UNIONIDAE)
- michelottiana, Pleuroploca michelottiana (J.P.S. Grateloup, 1847 †) - (FASCIOLARIIDAE) (FOSSIL)
- michelottiana, Melanopsis michelottiana P.M. Pallary, 1916 † - (MELANOPSIDAE) (FOSSIL)
- michelottii, Cerithium michelottii R. Hoernes, 1856 † - (CERITHIIDAE) (FOSSIL)
- michelottii, Serrulina michelottii (Michaud, 1862) † - (CLAUSILIIDAE) (FOSSIL)
- michelottii, Dentalium michelottii (R. Hoernes, 1856 †) - (DENTALIIDAE) (FOSSIL)
- michelottii, Phyllocoma michelottii (L.M.D. Bellardi, 1872 †) - (MURICIDAE) (FOSSIL)
- michelottii, Ranella michelottii L.M.D. Bellardi, 1872 † - syn of: Phyllocoma michelottii (L.M.D. Bellardi, 1872 †) - (RANELLIDAE) (FOSSIL)
- michelottii, Trivia michelottii G.F. Dollfus & P. Dautzenberg, 1886 † - (TRIVIIDAE) (FOSSIL)
- micherdzinskii, Bythinella micherdzinskii A. Falniowski, 1980 - (BYTHINELLIDAE)
- Micheviellidae, syn of: Genus Minicheviella Y.I. Starobogatov, 1983 (ASPERSPINIDAE)
- michiei, Placostylus ambagiosus michiei A.W.B. Powell, 1951 - (BOTHRIEMBRYONTIDAE)
- michiganensis, Antirotella michiganensis Radabaugh, 1942 † - syn of: Antirotella helicinaeformis (von Schlotheim, 1820 †) - (ANOMPHALIDAE) (FOSSIL)
- michiganensis, Manitobiella michiganensis Radabaugh, 1942 † - syn of: Manitobiella goniostoma (J.J.F. Whiteaves, 1890 †) - (GOSSELETINIDAE) (FOSSIL)
- michiganensis, Bathmospira michiganensis Radabaugh, 1942 † - syn of: Manitobiella goniostoma (J.J.F. Whiteaves, 1890 †) - (GOSSELETINIDAE) (FOSSIL)
- Michiganites, Genus Michiganites Ruzhencev, 1962 † (PROLECANITIDA (UNASSIGNED)) (FOSSIL)
- michikoae, Latiaxis michikoae T. Shikama, 1978 - syn of: Babelomurex indicus michikoae (T. Shikama, 1978) - (MURICIDAE)
- michikoae, Babelomurex indicus michikoae (T. Shikama, 1978) - (MURICIDAE)
- michinokuensis, Fairbankia michinokuensis T. Habe, 1973 - (IRAVADIIDAE)
- Michniakia, Genus Michniakia Missarzhevsky , 1966 † (YOCHELCIONELLIDAE) (FOSSIL)
- michnoi, Pseudobenedictia michnoi (W.A. Lindholm, 1929) - (LITHOGLYPHIDAE)
- michoacanensis, Conus aemulator michoacanensis Perrilliat, 1992 † - (CONIDAE) (FOSSIL)
- michoacanensis, Euglandina michoacanensis (H.A. Pilsbry, 1899) - (SPIRAXIDAE)
- michoacanensis, Ptychopatula michoacanensis H.A. Pilsbry, 1920 - (VERTIGINIDAE)
- micholitzi, Sulfurina micholitzi (A.J. Wagner, 1905) - (HELICINIDAE)
- michoniana, Cecilioides michoniana (J.R. Bourguignat, 1864) - (FERUSSACIIDAE)
- michonii, Neritaea michonii (J.R. Bourguignat, 1852) - (NERITIDAE)
- michonii, Unio michonii J.R. Bourguignat, 1852 - syn of: Leguminaia saulcyi (J.R. Bourguignat, 1852) - (UNIONIDAE)
- michrochasma, Tropidophora michrochasma (L. Pfeiffer, 1856) - syn of: Tropidophora microchasma (L. Pfeiffer, 1856) - (POMATIIDAE)
- Micichiton, Genus Micichiton B.I. Sirenko, 1975 (LEPIDOCHITONIDAE)
- micida, Candidula micida É.A.A. Locard, 1899 - syn of: Candidula olissipensis (G. Servain, 1880) - (HYGROMIIDAE)
- micidus, Leptomphalus micidus E.L. Yochelson, 1956 † - (EUOMPHALIDAE) (FOSSIL)
- micidus, Soleniscus micidus Pan & Erwin, 2002 † - (SOLENISCIDAE) (FOSSIL)
- micippe, Trigonia micippe R.A. Philippi, 1899 † - (TRIGONIIDAE) (FOSSIL)
- micipsa, Phylloceras micipsa Coquand, 1880 † - (PHYLLOCERATIDAE) (FOSSIL)
- mickali, Pseudocrioceras mickali Ropolo & Gonnet, 1999 † - (ANCYLOCERATIDAE) (FOSSIL)
- mickeyi, Hauericeras mickeyi Anderson, 1958 † - (DESMOCERATIDAE) (FOSSIL)
- micklei, Strombus micklei H.S. Ladd, 1972 † - (STROMBIDAE) (FOSSIL)
- mickletonense, Androgynoceras mickletonense Spath, 1938 † - (LIPAROCERATIDAE) (FOSSIL)
- mickwitzi, Lophospira mickwitzi E.F.R.K. Koken, 1896 † - (LOPHOSPIRIDAE) (FOSSIL)
- micostoma, Bomburites micostoma (A.V.M.D. D'Orbigny, 1846 †) - (TULITIDAE) (FOSSIL)
- micra, Aclis micra W.F. Petterd, 1884 - syn of: Koloonella micra (W.F. Petterd, 1884) - (ACLIDIDAE)
- micra, Leptachatina brevicula micra C.M. Cooke, 1910 - (AMASTRIDAE)
- micra, Leucotina micra G.B. Pritchard & J.H. Gatliff, 1900 - (AMATHINIDAE)
- micra, Aegista lautsi micra H.A. Pilsbry & Y. Hirase, 1905 - (BRADYBAENIDAE)
- micra, Retimohnia micra (W.H. Dall, 1907) - (BUCCINIDAE)
- micra, Zaptyx dolichoptyx micra H.A. Pilsbry, 1908 - (CLAUSILIIDAE)
- micra, Vexillum micra H.A. Pilsbry, 1921 - (COSTELLARIIDAE)
- micra, Corbicula micra Germain, 1922 - syn of: Corbicula fluminalis (O.F. Müller, 1774) - (CYRENIDAE)
- micra, Donaldina micra Beus, 1978 † - syn of: Cyclozyga micra (Beus, 1978 †) - (DONALDINIDAE) (FOSSIL)
- micra, Entalinopsis micra V. Scarabino, 1995 - (ENTALINIDAE)
- micra, Guppya micra H.A. Pilsbry, 1904 - (EUCONULIDAE)
- micra, Stachella micra Yu, 1980 † - (EUPHEMITIDAE) (FOSSIL)
- micra, Luoguispira micra Pan & Erwin, 2002 † - (GASTROPODA INCERTAE SEDIS) (FOSSIL)
- micra, Luciellina micra Pan, 1977 † - (GOSSELETINIDAE) (FOSSIL)
- micra, Ludwigella micra Buckman, 1901 † - syn of: Graphoceras micrum (Buckman, 1901 †) - (GRAPHOCERATIDAE) (FOSSIL)
- micra, Helix micra A.V.M.D. D'Orbigny, 1835 - syn of: Leptopeas micra (A.V.M.D. D'Orbigny, 1835) - (HELICIDAE)
- micra, Sonorella micra H.A. Pilsbry & J.H. Ferriss, 1910 - (HELMINTHOGLYPTIDAE)
- micra, Phreatodrobia micra (H.A. Pilsbry & J.H. Ferriss, 1906) - (HYDROBIIDAE)
- micra, Reesidella micra Pan, 1977 † - (HYDROBIIDAE) (FOSSIL)
- micra, Cyclostrema micra W.F. Petterd, 1884 - syn of: Microdiscula charopa (R. Tate, 1899) - (LIOTIIDAE)
- micra, Girtyspira micra Xi, 1980 † - (MEEKOSPIRIDAE) (FOSSIL)
- micra, Koloonella micra (W.F. Petterd, 1884) - (MURCHISONELLIDAE)
- micra, Murexsul micra (R. Houart, 2001) - (MURICIDAE)
- micra, Tectonatica micra (F. Haas, 1953) - (NATICIDAE)
- micra, Viriatellina micra Xian, 1980 † - (NOWAKIIDAE) (FOSSIL)
- micra, Tricolia micra H.A. Pilsbry, 1917 - (PHASIANELLIDAE)
- micra, Cyclozyga micra (Beus, 1978 †) - (PSEUDOZYGOPLEURIDAE) (FOSSIL)
- micra, Pseudozygopleura micra Pan & Erwin, 2002 † - (PSEUDOZYGOPLEURIDAE) (FOSSIL)
- micra, Punctum micra H.A. Pilsbry, 1927 - (PUNCTIDAE)
- micra, Eulimella micra A. Peñas & E. Rolán, 2016 - (PYRAMIDELLIDAE)
- micra, Rissoella micra (H.J. Finlay, 1924) - (RISSOELLIDAE)
- micra, Zelaxitas micra H.J. Finlay, 1924 - syn of: Rissoella micra (H.J. Finlay, 1924) - (RISSOELLIDAE)
- micra, Lissotesta micra (J.E. Tenison-Woods, 1877) - (SEGUENZIOIDEA (UNASSIGNED))
- micra, Lissotesta micra H.H. Suter, 1913 - syn of: Lissotesta errata H.J. Finlay, 1926 - (SEGUENZIOIDEA (unassigned))
- micra, Bulimorpha micra Yu & Xi, 1974 † - (SOLENISCIDAE) (FOSSIL)
- micra, Laxella micra Pan & Erwin, 2002 † - (STREPTACIDIDAE) (FOSSIL)
- micra, Leptopeas micra (A.V.M.D. D'Orbigny, 1835) - (SUBULINIDAE)
- micra, Allopeas micra A.V.M.D. D'Orbigny, 1835 - syn of: Leptopeas micra (A.V.M.D. D'Orbigny, 1835) - (SUBULINIDAE)
- micra, Veremolpa micra H.A. Pilsbry, 1904 - syn of: Timoclea scabra (S.C.T. Hanley, 1845) - (VENERIDAE)
- micra, Lyropupa micra C.M. Cooke & H.A. Pilsbry, 1920 - (VERTIGINIDAE)
- micra caraccasensis, Opeas micra caraccasensis L.A. Reeve, 1849 - syn of: Beckianum beckianum (L. Pfeiffer, 1846) - (SUBULINIDAE)
- micra maunaloae, Lyropupa micra maunaloae H.A. Pilsbry & C.M. Cooke, 1920 - (VERTIGINIDAE)
- micra mazatlanica, Leptopeas micra mazatlanica H.A. Pilsbry, 1931 - (SUBULINIDAE)
- micra percostata, Lyropupa micra percostata H.A. Pilsbry & C.M. Cooke, 1920 - (VERTIGINIDAE)
- micra tryonianum, Opeas micra tryonianum R. Tate, 1870 - syn of: Leptopeas micra (A.V.M.D. D'Orbigny, 1835) - (SUBULINIDAE)
- Micrabralia, Subgenus Abraliopsis (Micrabralia) Pfeffer, 1900 (ENOPLOTEUTHIDAE)
- micracanthicum, Papilliceras micracanthicum S.S. Buckman, 1925 † - (SONNINIIDAE) (FOSSIL)
- Micracanthoceras, Genus Micracanthoceras Imlay, 1939 † (HIMALAYITIDAE) (FOSSIL)
- Micraclathurella, Genus Micraclathurella † (NEOGASTROPODA (UNASSIGNED)) (FOSSIL)
- Micractaeon, Genus Micractaeon B. Verdcourt, 1993 (MICRACTAEONIDAE)
- MICRACTAEONIDAE Schileyko, 1999 - Family (GASTROPODA-HETEROBRANCHIA [Subclass]-PULMONATA [Infraclass]-STYLOMMATOPHORA [Order]-ACHATINOIDEA [Superfamily])
- micrae, Opeas micrae (A.V.M.D. D'Orbigny, 1835) - (SUBULINIDAE)
- Micraenigma, Genus Micraenigma S.S. Berry, 1953 (SCAPHANDRIDAE)
- micramadum, Costellaria micramadum W.P. Woodring, 1928 † - (COSTELLARIIDAE) (FOSSIL)
- Micramussium, syn of: Genus Parvamussium F. Sacco, 1897 (PROPEAMUSSIIDAE)
- micramyla, Palline micramyla G.A. Solem, 1983 - (CHAROPIDAE)
- Micrancilla, Genus Micrancilla P.A. Maxwell, 1992 (ANCILLARIIDAE)
- Micranellium, Genus Micranellium Bartsch, 1920 † (CAECIDAE) (FOSSIL)
- Micranellum, syn of: Genus Caecum J. Fleming, 1813 (CAECIDAE)
- Micranellum, syn of: Genus Caecum J. Fleming, 1813 (CAECIDAE)
- Micranepsia, Subgenus Cryptomastix (Micranepsia) Pilsbry, 1940 (POLYGYRIDAE)
- Micranodonta, Genus Micranodonta Kuiper, 1965 (SPHAERIIDAE)
- micrans, Melanella micrans H.F. Carpenter, 1864 - syn of: Melanella micans (H.F. Carpenter, 1865) - (EULIMIDAE)
- micrapex, Bathycrinicola micrapex P. Bouchet & A. Warén, 1986 - (EULIMIDAE)
- Micrarionta, Genus Micrarionta C.M.F. Ancey, 1880 (HELMINTHOGLYPTIDAE)
- Micrartemon, Genus Micrartemon O.F. von Möllendorff, 1890 (STREPTAXIDAE)
- micrasiatica, Guineana micrasiatica (Bittner, 1891 †) - (TRIGONIIDAE) (FOSSIL)
- micrasterias, Arieticeras micrasterias (Meneghini, 1874 †) - (HILDOCERATIDAE) (FOSSIL)
- Micrastraea, syn of: Genus Bellastraea T. Iredale, 1924 (TURBINIDAE)
- micratracta, Clausilia micratracta J.R. Bourguignat, 1877 - syn of: Clausilia rugosa parvula A.E.J. Férussac, 1807 - (CLAUSILIIDAE)
- micratracta, Volvulella micratracta J. Brown & H.A. Pilsbry, 1913 † - (RHIZORIDAE) (FOSSIL)
- Micratys, Genus Micratys T. Habe, 1952 (HAMINOEIDAE)
- micraulax, Calliotropis micraulax C. Vilvens, 2004 - (CALLIOTROPIDAE)
- Micraulax, Genus Micraulax W. Theobald, 1876 (CYCLOPHORIDAE)
- micraulax, Stewartia micraulax Rossbach & Carter 1991 † - (LUCINIDAE) (FOSSIL)
- micraulax, Gymnobela micraulax A.V. Sysoev, 1997 - (RAPHITOMIDAE)
- micraulax, Solariella micraulax J.H. McLean, 1964 - (SOLARIELLIDAE)
- Micrelasma, Subgenus Traliopsis (Micrelasma) G.F. Harris & H.W. Burrows, 1891 (ELLOBIIDAE)
- Micrelenchus, syn of: Genus Cantharidus P.D. Montfort, 1810 (TROCHIDAE)
- Micrelenchus, syn of: Genus Cantharidus P.D. Montfort, 1810 (TROCHIDAE)
- micrembryon, Puposyrnola micrembryon E. Saurin, 1959 - (PYRAMIDELLIDAE)
- Micrentoma, Genus Micrentoma Donald, 1898 † (MURCHISONIIDAE) (FOSSIL)
- Micreschara, Genus Micreschara A.E.M. Cossmann, 1888 (VANIKORIDAE)
- Micridyla, Genus Micridyla H. Nordsieck, 1973 (CLAUSILIIDAE)
- micro, Perrona micro E. Rolán, P. Ryall & J. Horro, 2008 - (CLAVATULIDAE)
- micro, Arinia micro Marzuki & Foon, 2016 - (DIPLOMMATINIDAE)
- Microalcadia, Subgenus Alcadia (Microalcadia) I. Richling, 2004 (HELICINIDAE)
- Microarion, syn of: Subgenus Arion (Kobeltia) H. Seibert, 1873 (ARIONIDAE)
- Microbactrites, Genus Microbactrites Shimanskiy , 1954 † (PARABACTRITIDAE) (FOSSIL)
- Microbaltoceras, Genus Microbaltoceras Flower, 1964 † (BALTOCERATIDAE) (FOSSIL)
- Microbeliscus, Genus Microbeliscus Sandberger, 1875 † (HYDROBIIDAE) (FOSSIL)
- microbeliscus, Saxurinator microbeliscus H. Schütt, 1968 - (HYDROBIIDAE)
- Microbeliscus, syn of: Subgenus Obeliscus (Ischnocion) H.A. Pilsbry, 1907 (SUBULINIDAE)
- microbesitas, Cavolinia microbesitas Janssen, 2012 † - (CAVOLINIIDAE) (FOSSIL)
- microbia, Setia microbia H.J. Hoenselaar & H.J. Hoenselaar, 1991 - (RISSOIDAE)
- microbiplex, Microbiplices microbiplex (F.A. von Quenstedt, 1887 †) - (AULACOSTEPHANIDAE) (FOSSIL)
- Microbiplices, Genus Microbiplices Arkell, 1947 † (AULACOSTEPHANIDAE) (FOSSIL)
- microbispiralis, Dyris microbispiralis Wesselingh, 2006 † - (COCHLIOPIDAE) (FOSSIL)
- Microborus, syn of: Genus Austroborus J.J. Parodíz, 1949 (STROPHOCHEILIDAE)
- Microcallista, Subgenus Callista (Microcallista) C.C. Stewart, 1930 † (VENERIDAE) (FOSSIL)
- Microcalva, Genus Microcalva † (VENERIDAE) (FOSSIL)
- microcancelli, Calliomphalus microcancelli L.W. Stephenson, 1941 † - (CALLIOTROPIDAE) (FOSSIL)
- Microcancilla, Genus Microcancilla W.H. Dall, 1924 (CANCELLARIIDAE)
- microcanthum, Micracanthoceras microcanthum (Oppel, 1865 †) - (HIMALAYITIDAE) (FOSSIL)
- microcardia, Isodontocardia microcardia P.U. Middelfart, 2002 - (CONDYLOCARDIIDAE)
- Microcardium, Subgenus Nemocardium (Microcardium) A.M. Keen, 1937 (CARDIIDAE)
- Microcarina, Genus Microcarina C.F. Laseron, 1954 (SEGUENZIOIDEA (UNASSIGNED))
- Microcassis, syn of: Genus Cystiscus W. Stimpson, 1865 (CYSTISCIDAE)
- microcentrica, Cuna microcentrica P.U. Middelfart, 2002 - syn of: Cuna microconcentrica P.U. Middelfart, 2002 - (CONDYLOCARDIIDAE)
- microcephala, Radix microcephala H.C. Küster - syn of: Radix labiata (E.A. Rossmässler, 1835) - (LYMNAEIDAE)
- microcephala, Segmentina microcephala G. Servain, 1881 - syn of: Segmentina nitida (O.F. Müller, 1774) - (PLANORBIDAE)
- microcephalus, Arcestes microcephalus Mojsisovics, 1875 † - (ARCESTIDAE) (FOSSIL)
- microcephalus, Magilus microcephalus G.B. II Sowerby, 1872 - syn of: Magilus antiquus P.D. Montfort, 1810 - (MURICIDAE)
- Microceramus, Genus Microceramus H.A. Pilsbry & E.G. Vanatta, 1898 (UROCOPTIDAE)
- microceras, Renea microceras (A. Braun in Walchner, 1851) † - (ACICULIDAE) (FOSSIL)
- Microceras, syn of: Genus Cyrtolites Conrad , 1838 † (CYRTOLITIDAE) (FOSSIL)
- microceras, Euhoplites microceras (Spath 1925 †) - (HOPLITIDAE) (FOSSIL)
- microcerata, Pleurotoma microcerata L. de Folin, 1879 - (TURRIDAE)
- Microcerithium, Genus Microcerithium Guzhov, 2004 (CRYPTAULACIDAE) (FOSSIL)
- microchaetophora, Viviparus microchaetophora T.N. Annandale, 1921 - (VIVIPARIDAE)
- microcharia, Rissoa microcharia W.H. Dall, 1892 † - (RISSOIDAE) (FOSSIL)
- Microcharopa, Genus Microcharopa G.A. Solem, 1983 (CHAROPIDAE)
- microchasma, Theba solimae microchasma C.F. Sacchi, 1955 - (HELICIDAE)
- microchasma, Tropidophora microchasma (L. Pfeiffer, 1856) - (POMATIIDAE)
- microcheila, Asthenotoma microcheila (F.E. Edwards, 1861 †) - (BORSONIIDAE) (FOSSIL)
- microcheila, Tripia microcheila F.E. Edwards † - (PSEUDOMELATOMIDAE) (FOSSIL)
- microcheilos, Turbonilla microcheilos L. de Folin & J.P.L. Périer, 1879 - (PYRAMIDELLIDAE)
- Microcheilus, Genus Microcheilus Kittl, 1894 † (SABRINELLIDAE) (FOSSIL)
- microchila, Asthenotoma microchila F.E. Edwards, 1861 † - syn of: Asthenotoma microcheila (F.E. Edwards, 1861 †) - (BORSONIIDAE) (FOSSIL)
- microchira, Xylophaga microchira J.R. Voight, 2007 - (XYLOPHAGAIDAE)
- Microchlamys, syn of: Genus Dhondtichlamys Waller , 2001 † (PECTINIDAE) (FOSSIL)
- Microcincinna, syn of: Subgenus Valvata (Cincinna) J. Hübner, 1810 (VALVATIDAE)
- Microcirce, syn of: Subgenus Gouldia (Gouldiopa) T. Iredale, 1924 (VENERIDAE)
- Microcithara, Genus Microcithara P. Fischer, 1844 (COLUMBELLIDAE)
- Microclanculus, Subgenus Clanculus (Microclanculus) B.C. Cotton & F.C. Godfrey, 1934 (TROCHIDAE)
- microclathrata, Proturritella microclathrata Hudson, 1905 † - (LOPHOSPIRIDAE) (FOSSIL)
- micrococcus, Amnicola micrococcus H.A. Pilsbry in R.E.C. Stearns, 1893 - syn of: Pyrgulopsis micrococcus (H.A. Pilsbry, 1893) - (AMNICOLIDAE)
- micrococcus, Pyrgulopsis micrococcus (H.A. Pilsbry, 1893) - (HYDROBIIDAE)
- microcochleus, Subulites microcochleus Wang, 1980 † - (SUBULITIDAE) (FOSSIL)
- microcochlia, Bythinella microcochlia A. Letourneux & J.R. Bourguignat, 1887 - (BYTHINELLIDAE)
- Microcochlis, Genus Microcochlis Yoo, 1994 † (GASTROPODA INCERTAE SEDIS) (FOSSIL)
- Microcolpia, Subgenus Fagotia (Microcolpia) J.R. Bourguignat, 1884 (MELANOPSIDAE)
- microcolpia, Melanopsis microcolpia J.R. Bourguignat, 1884 - (MELANOPSIDAE)
- Microcolus, Genus Microcolus B.C. Cotton & F.C. Godfrey, 1932 (FASCIOLARIIDAE)
- microcona, Littoridina microcona F.G. Thompson & R. Hershler, 1991 - (COCHLIOPIDAE)
- microconcentrica, Cuna microconcentrica P.U. Middelfart, 2002 - (CONDYLOCARDIIDAE)
- microconcentrica, Nucula microconcentrica B. Wade, 1926 † - (NUCULIDAE) (FOSSIL)
- microconcha, Buccinum microconcha T. Habe & K. Itô, 1965 - syn of: Buccinum japonicum A. Adams, 1861 - (BUCCINIDAE)
- microconcha, Bolma microconcha S. Kosuge, 1985 - (TURBINIDAE)
- Microconchus, Genus Microconchus Murchison , 1839 † (VIRIATELLIDAE) (FOSSIL)
- Microconcinna, Subgenus Valvata (Microconcinna) Y.I. Starobogatov, 1983 (VALVATIDAE)
- Microcondylaea, Subgenus Leguminaia (Microcondylaea) W. Von Vest, 1866 (UNIONIDAE)
- Microcondylus, syn of: Subgenus Leguminaia (Microcondylaea) W. Von Vest, 1866 (UNIONIDAE)
- microconus, Chamalycaeus microconus (O.F. von Möllendorff, 1886) - (CYCLOPHORIDAE)
- microconus, Napaeus pinguis microconus C.M.F. Ancey, 1883 - (ENIDAE)
- microconus, Coneuplecta microconus (A. Mousson, 1865) - (EUCONULIDAE)
- Microconus, Genus Microconus H. Strebel & G.J. Pfeffer, 1880 (THYSANOPHORIDAE)
- microconvexus, Onobops microconvexus Wesselingh, 2006 † - (COCHLIOPIDAE) (FOSSIL)
- Microcornus, Genus Microcornus Mambetov , 1972 † (NELEGEROCORNIDAE) (FOSSIL)
- microcoronata, Mandelia microcoronata Á. Valdés & T.M. Gosliner, 1999 - syn of: Mandelia mirocornata Á. Valdés & T.M. Gosliner, 1999 - (MANDELIIDAE)
- microcosmos, Punctum microcosmos J.C. Cox, 1868 - (PUNCTIDAE)
- microcosta, Estea microcosta W.L. May, 1920 - syn of: Pisinna kershawi (J.E. Tenison-Woods, 1878) - (ANABATHRIDAE)
- microcosta, Gabbia microcosta W.F. Ponder, 2003 - (BITHYNIIDAE)
- microcosta, Tricula microcosta Y.Y. Liu, Y.X. Wang & W.Z. Zhang, 1991 - (POMATIOPSIDAE)
- microcostatus, Dicharax microcostatus Páll-Gergely, 2017 - (CYCLOPHORIDAE)
- microcostatus, Imerites microcostatus Rouchadze, 1933 † - (HEMIHOPLITIDAE) (FOSSIL)
- microcostatus, Imerites microcostatus Rouchadzé, 1933 † - syn of: Calanquites microcostatus (Rouchadzé, 1933 †) - (HEMIHOPLITIDAE) (FOSSIL)
- microcostatus, Calanquites microcostatus (Rouchadzé, 1933 †) - (HETEROCERATIDAE) (FOSSIL)
- microcostatus, Costidiscus microcostatus (Simonovich & al., 1875 †) - (MACROSCAPHITIDAE) (FOSSIL)
- microcostellatus, Fuscapex microcostellatus P. Bouchet & A. Warén, 1986 - (EULIMIDAE)
- microcotyla, Bolitaena microcotyla W.E. Hoyle, 1904 - (BOLITAENIDAE)
- Microcucullaea, syn of: Genus Bathyarca W. Kobelt, 1891 (ARCIDAE)
- Microcyclas, Genus Microcyclas Raspail, 1909 (VALVATIDAE)
- microcyclus, Caecum microcyclus L. de Folin, 1879 - (CAECIDAE)
- Microcyclus, Subgenus Urocyclus (Microcyclus) H.R. Simroth, 1896 (UROCYCLIDAE)
- Microcyprina, Genus Microcyprina Cossmann, 1921 † (CARDIIDA (UNASSIGNED)) (FOSSIL)
- Microcystina, Genus Microcystina O.A.L. Mörch, 1872 (ARIOPHANTIDAE)
- Microcystis, Genus Microcystis H.H. Beck, 1837 (EUCONULIDAE)
- Microdactylites, syn of: Genus Dactylioceras Simpson, 1855 † (DACTYLIOCERATIDAE) (FOSSIL)
- Microdaphne, Genus Microdaphne J.H. McLean, 1971 (RAPHITOMIDAE)
- Microdelos, Genus Microdelos J. Stanisic, 2010 (RHYTIDIDAE)
- Microderoceras, Genus Microderoceras Hyatt, 1871 † (EODEROCERATIDAE) (FOSSIL)
- microdina chryseis, Eutrochatella microdina chryseis H.B. Tristram, 1862 - syn of: Pyrgodomus microdinus (P.M.A. Morelet, 1851) - (HELICINIDAE)
- microdinus, Pyrgodomus microdinus (P.M.A. Morelet, 1851) - (HELICINIDAE)
- microdinus abditus, Pyrgodomus microdinus abditus H.B. Baker, 1928 - (HELICINIDAE)
- microdinus huberi, Pyrgodomus microdinus huberi A.S.H. Breure, 1976 - (HELICINIDAE)
- Microdiphasoceras, Genus Microdiphasoceras Cobban, 1989 † (VASCOCERATIDAE) (FOSSIL)
- Microdiscula, Genus Microdiscula K.H.J. Thiele, 1912 (ORBITESTELLIDAE)
- MICRODISCULIDAE - syn of Family: ORBITESTELLIDAE
- microdiscus, Charopa microdiscus W.S.S. Van Benthem-Jutting, 1951 - syn of: Discocharopa aperta (O.F. von Möllendorff, 1888) - (CHAROPIDAE)
- microdiscus, Chamalycaeus microdiscus (O.F. von Möllendorff, 1886) - (CYCLOPHORIDAE)
- microdiscus, Discoconulus microdiscus (O.W.H. Reinhardt, 1877) - (EUCONULIDAE)
- microdiscus, Happia microdiscus K.H.J. Thiele, 1927 - (SCOLODONTIDAE)
- microdiscus, Aristoceratoides microdiscus (C. Gemmellaro, 1887 †) - (THALASSOCERATIDAE) (FOSSIL)
- microdiscus, Xenophora microdiscus E.J. Petuch, 1994 † - (XENOPHORIDAE) (FOSSIL)
- Microdochus, syn of: Genus Elachisina W.H. Dall, 1918 (ELACHISINIDAE)
- microdoma, Leiostyla microdoma O. Böttger, 1889 † - syn of: Minacilla minax (O. Böttger, 1889 †) - (LAURIIDAE) (FOSSIL)
- Microdoma, Genus Microdoma Meek & Worthen, 1867 † (MICRODOMATIDAE) (FOSSIL)
- MICRODOMATIDAE Wenz, 1938 † - Family (GASTROPODA-VETIGASTROPODA [Subclass]-TROCHOIDEA [Superfamily]) (FOSSIL)
- microdomum, Coryceras microdomum (Oppel 1863 †) - (HAPLOCERATIDAE) (FOSSIL)
- microdon, Leptachatina microdon H.A. Pilsbry & C.M. Cooke, 1914 - (AMASTRIDAE)
- microdon, Cerion microdon H.A. Pilsbry & E.G. Vanatta, 1896 - (CERIONIDAE)
- microdon, Chilina fluminea microdon H.A. Pilsbry, 1911 - (CHILINIDAE)
- microdon, Chondrina microdon C.A. Westerlund, 1897 - syn of: Chondrina farinesii C. des Moulins, 1835 - (CHONDRINIDAE)
- microdon, Purpuradusta microdon (J.E. Gray, 1828) - (CYPRAEIDAE)
- microdon, Cypraea microdon J.E. Gray, 1828 - syn of: Purpuradusta microdon (J.E. Gray, 1828) - (CYPRAEIDAE)
- microdon, Multidentula microdon H. Schütt, 1995 - syn of: Multidentula substurmii (O. von Retowski, 1886) - (ENIDAE)
- Microdon, syn of: Genus Eodon Hall, 1877 † (EODONIDAE) (FOSSIL)
- microdon, Clanculus microdon A. Adams, 1853 - (TROCHIDAE)
- microdon, Sphenonaias microdon (E.C. Von Martens, 1887) - (UNIONIDAE)
- microdon, Macroceramus microdon (L. Pfeiffer, 1853) - (UROCOPTIDAE)
- microdon ater, Clanculus microdon ater H.A. Pilsbry, 1911 - syn of: Clanculus microdon A. Adams, 1853 - (TROCHIDAE)
- microdon cardenense, Cerion microdon cardenense C.G. Aguayo & M.I. Sánchez Roig, 1953 - (CERIONIDAE)
- microdon chrysalis, Purpuradusta microdon chrysalis (L.C. Kiener, 1843) - (CYPRAEIDAE)
- microdon pygmaeum, Cerion microdon pygmaeum H.A. Pilsbry & E.G. Vanatta, 1896 - syn of: Cerion pygmaeum H.A. Pilsbry & E.G. Vanatta, 1896 - (CERIONIDAE)
- microdonta, Stylodon microdonta G.P. Deshayes, 1832 - syn of: Stylodonta unidentata (H.S. Holten, 1802) - (ACAVIDAE)
- microdonta, Armina microdonta (L.S.R. Bergh, 1907) - (ARMINIDAE)
- microdonta, Helix microdonta G.P. Deshayes, 1832 - syn of: Stylodonta unidentata (H.S. Holten, 1802) - (HELICIDAE)
- microdonta, Gibbolucina microdonta (G.P. Deshayes, 1857 †) - (LUCINIDAE) (FOSSIL)
- microdonta, Ashmunella microdonta H.A. Pilsbry & J.H. Ferriss, 1909 - (POLYGYRIDAE)
- microdonta, Poromya microdonta W.H. Dall, 1890 - syn of: Cetomya tornata (J.G. Jeffreys, 1876) - (POROMYIDAE)
- microdonta, Yoldia microdonta Meek 1871 † - (YOLDIIDAE) (FOSSIL)
- Microdontia, syn of: Genus Velesunio T. Iredale, 1934 (HYRIIDAE)
- Microdrillia, Genus Microdrillia T.L. Casey, 1903 (BORSONIIDAE)
- Microdryas, Genus Microdryas C.F. Laseron, 1950 (ANABATHRIDAE)
- Microeledone, Genus Microeledone M.D. Norman, F.G. Hochberg & R. Boucher-Rodoni, 2004 (OCTOPODIDAE)
- microeques, Odostomia microeques E. Rolán & J. Templado in A. Peñas & E. Rolán, 1999 - (PYRAMIDELLIDAE)
- Microestea, syn of: Genus Pisinna T.A. de M. Monterosato, 1878 (ANABATHRIDAE)
- Microeulima, Genus Microeulima A. Warén, 1992 (EULIMIDAE)
- microforis, Arene microforis (W.H. Dall, 1889) - (ARENEIDAE)
- microforis, Niso microforis W.H. Dall, 1927 - (EULIMIDAE)
- microforis, Liotia microforis W.H. Dall, 1889 - syn of: Arene microforis (W.H. Dall, 1889) - (LIOTIIDAE)
- microformis, Ovassiminea microformis Pan, 1980 † - (ASSIMINEIDAE) (FOSSIL)
- Microfossa, syn of: Genus Amphithalamus P.P. Carpenter, 1865 (ANABATHRIDAE)
- Microfragum, Genus Microfragum T. Habe, 1951 (CARDIIDAE)
- Microfulgur, Genus Microfulgur H.J. Finlay & J. Marwick, 1937 (FASCIOLARIIDAE)
- microfurcata, Toxoconcha microfurcata A. Nützel & Senowbari-Daryan, 1999 † - (PROTORCULIDAE) (FOSSIL)
- Microfusus, syn of: Genus Nassaria J.H.F. Link, 1807 (NASSARIIDAE)
- microgaza, Assiminea microgaza J. Gardner, 1937 † - (ASSIMINEIDAE) (FOSSIL)
- microgaza, Egestula microgaza (F.M. Climo, 1973) - (CHAROPIDAE)
- microgaza, Charopa microgaza F.M. Climo, 1973 - syn of: Egestula microgaza (F.M. Climo, 1973) - (CHAROPIDAE)
- Microgaza, Genus Microgaza W.H. Dall, 1881 (SOLARIELLIDAE)
- Microgenia, Genus Microgenia C.F. Laseron, 1954 (RAPHITOMIDAE)
- Microginella, syn of: Genus Granulina F.P. Jousseaume, 1888 (MARGINELLIDAE)
- Microgloma, Genus Microgloma A. Sanders & J.A. Allen, 1973 (YOLDIIDAE)
- microglossa, Natica microglossa G.P. Deshayes, 1864 † - (NATICIDAE) (FOSSIL)
- Microglyphis, Genus Microglyphis W.H. Dall, 1902 (RINGICULIDAE)
- microglypta, Pila microglypta H.A. Pilsbry & J.C. Bequaert, 1927 - (AMPULLARIIDAE)
- microglypta, Hemiglypta microglypta O.F. von Möllendorff, 1893 - (HELICARIONIDAE)
- microglypta, Alvania microglypta F. Haas, 1943 - (RISSOIDAE)
- microglypta, Merrilliana microglypta H.A. Pilsbry & A.P. Brown, 1910 - syn of: Geomelania pygmaea (C.B. Adams, 1845) - (TRUNCATELLIDAE)
- microgonia, Cystiscus microgonia (W.H. Dall, 1927) - (CYSTISCIDAE)
- microgonia, Marginella microgonia W.H. Dall, 1927 - syn of: Cystiscus microgonia (W.H. Dall, 1927) - (MARGINELLIDAE)
- microgonia, Eratoidea microgonia W.H. Dall, 1927 - syn of: Cystiscus microgonia (W.H. Dall, 1927) - (MARGINELLIDAE)
- microgonia, Granulina microgonia W.H. Dall, 1927 - syn of: Cystiscus microgonia (W.H. Dall, 1927) - (MARGINELLIDAE)
- microgrammata, Liotia microgrammata W.H. Dall, 1927 - (LIOTIIDAE)
- micrograpta, Bekkochlamys micrograpta (H.A. Pilsbry, 1900) - (HELICARIONIDAE)
- microgyra, Trochulus microgyra J.R. Bourguignat in É.A.A. Locard, 1882 - syn of: Trichia hispida (C. Linnaeus, 1758) - (HYGROMIIDAE)
- Microhappia, syn of: Subgenus Miradiscops (Punctodiscops) F.C. Baker, 1925 (SCOLODONTIDAE)
- Microhedyle, Genus Microhedyle H. Hertling, 1930 (PARHEDYLIDAE)
- microhelix, Radiodiscus microhelix F. Haas, 1951 - (HELICODISCIDAE)
- Microheynemannia, syn of: Subgenus Limax (Malacolimax) A.W. Malm, 1868 (LIMACIDAE)
- microida, Asperarca microida Berezovsky, 2014 † - (ARCIDAE) (FOSSIL)
- microimbricata, Ctena microimbricata Gardner, 1943 † - (LUCINIDAE) (FOSSIL)
- Microkerkus, Subgenus Sheldonia (Microkerkus) H.H. Godwin-Austen, 1912 (UROCYCLIDAE)
- Microlacuna, Genus Microlacuna Wenz, 1939 † (CAENOGASTROPODA (UNASSIGNED)) (FOSSIL)
- microlampas, Pterygioteuthis microlampas S.S. Berry, 1913 - (PYROTEUTHIDAE)
- Microlampra, Genus Microlampra Pan & Erwin, 2002 † (ORTHONEMIDAE) (FOSSIL)
- microlamyi, Kalidos microlamyi E. Fischer-Piette, Ch.P. Blanc & D. Vukadinovic, 1974 - (ARIOPHANTIDAE)
- microlena, Clausilia microlena J.R. Bourguignat, 1877 - syn of: Clausilia rugosa reboudii D. Dupuy, 1850 - (CLAUSILIIDAE)
- microlena, Truncatella microlena T.A. de M. Monterosato, 1878 - syn of: Truncatella subcylindrica (C. Linnaeus, 1767) - (TRUNCATELLIDAE)
- microlena, Vertigo microlena J.R. Bourguignat, 1864 - syn of: Isthmia pygmaea (J.P.R. Draparnaud, 1801) - (VERTIGINIDAE)
- microlepos, Spondylus microlepos J.B.P.A. Lamarck, 1819 - (SPONDYLIDAE)
- microlepos, Spondylus microlepos K.L. Lamprell, 1986 - syn of: Spondylus heidkeae K.L. Lamprell & J.M. Healy, 2001 - (SPONDYLIDAE)
- Microlimnaea, syn of: Genus Galba F. von P. Schrank, 1803 (LYMNAEIDAE)
- microlinea, Odostomia microlinea C.F. Laseron, 1951 - (PYRAMIDELLIDAE)
- microlineatum, Cerithium microlineatum W.M. Gabb, 1873 † - (CERITHIIDAE) (FOSSIL)
- microlineatus, Antillipecten microlineatus Waller, 2011 † - (PECTINIDAE) (FOSSIL)
- Microlinices, Genus Microlinices L.R.L. Simone, 2014 (NATICIDAE)
- Microliotia, Genus Microliotia O. Böttger, 1901 (PICKWORTHIIDAE)
- microlirata, Myrtea microlirata (Finlay & J. Marwick, 1937 †) - (LUCINIDAE) (FOSSIL)
- microlirata, Powellisetia microlirata W.F. Ponder & H.W. Worsfold, 1994 - (RISSOIDAE)
- microlobatum, Endoceras microlobatum Flower, 1958 † - (ENDOCERATIDAE) (FOSSIL)
- Micrologus, Genus Micrologus Fraussen & Rosado, 2011 (BUCCINIDAE)
- Microlophus, syn of: Genus Tritonia G.L.C.F.D. Cuvier, 1798 (TRITONIIDAE)
- Microloripes, Subgenus Parvilucina (Microloripes) A.E.M. Cossmann, 1910 (LUCINIDAE)
- microlucens, Magnoteuthis microlucens (A.T. Young, S.J. Lindgren & M. Vecchione, 2008) - (MASTIGOTEUTHIDAE)
- microlucens, Mastigoteuthis microlucens A.T. Young, S.J. Lindgren & M. Vecchione, 2008 - syn of: Magnoteuthis microlucens (A.T. Young, S.J. Lindgren & M. Vecchione, 2008) - (MASTIGOTEUTHIDAE)
- Microlyria, syn of: Genus Lyria J.E. Gray, 1847 (VOLUTIDAE)
- Microlyria, syn of: Genus Lyria J.E. Gray, 1847 (VOLUTIDAE)
- Micromactra, syn of: Subgenus Mactra (Mactrella) Gray † (MACTRIDAE) (FOSSIL)
- micromaculata, Albinaria grisea micromaculata E. Neubert, 1998 - (CLAUSILIIDAE)
- Micromaizania, Subgenus Maizania (Micromaizania) B. Verdcourt, 1964 (MAIZANIIDAE)
- Micromaizaniella, Subgenus Maizaniella (Micromaizaniella) S.M. Van Bruggen, 1982 (MAIZANIIDAE)
- Micromelampus, Subgenus Detracia (Micromelampus) O.F. von Möllendorff, 1898 (ELLOBIIDAE)
- Micromelania, Genus Micromelania Brusina, 1874 † (HYDROBIIDAE) (FOSSIL)
- Micromelo, Genus Micromelo H.A. Pilsbry, 1895 (APLUSTRIDAE)
- Micromelon, Genus Micromelon G.A. Solem, 1992 (CAMAENIDAE)
- Micromena, Genus Micromena F.C. Baker, 1939 (SPIRAXIDAE)
- Micromenetus, Subgenus Menetus (Micromenetus) F.C. Baker, 1945 (PLANORBIDAE)
- Micromenia, Genus Micromenia E.H.J. Leloup, 1948 (DONDERSIIDAE)
- Micromeris, Genus Micromeris T.A. Conrad, 1866 (CONDYLOCARDIIDAE)
- micromeris, Agathotoma micromeris W.H. Dall, 1903 - (MANGELIIDAE)
- micromeris, Ocenebra micromeris W.H. Dall, 1890 - (MURICIDAE)
- micrometalleoides, Helminthoglypta micrometalleoides W.B. Miller, 1970 - (HELMINTHOGLYPTIDAE)
- micrometalleus, Sonorelix micrometalleus (S.S. Berry, 1930) - (HELMINTHOGLYPTIDAE)
- micrometrica, Tubbreva micrometrica (A. Aradas & L. Benoit, 1876) - (CINGULOPSIDAE)
- micrometrica, Eatonina micrometrica M.E.J. Bucquoy, P. Dautzenberg & G.F. Dollfus, 1884 - syn of: Eatonina pumila (T.A. de M. Monterosato, 1884) - (CINGULOPSIDAE)
- micrometrica, Pseudoaclisina micrometrica A. Peñas & E. Rolán, 2013 - (MURCHISONELLIDAE)
- micrometrica, Odostomia micrometrica A. Peñas & E. Rolán, 1999 - (PYRAMIDELLIDAE)
- micrometrica, Rissoa micrometrica A. Aradas & L. Benoit, 1876 - syn of: Tubbreva micrometrica (A. Aradas & L. Benoit, 1876) - (RISSOIDAE)
- micrometrica, Yoldia micrometrica G. Seguenza, 1877 - (YOLDIIDAE)
- Micromilax, syn of: Genus Milax J.E. Gray, 1855 (MILACIDAE)
- Micromitra, syn of: Genus Thala H. Adams & A. Adams, 1853 (COSTELLARIIDAE)
- micromphala, Tornatellides micromphala H.A. Pilsbry & C.M. Cooke, 1915 - (ACHATINELLIDAE)
- micromphala, Architectonica micromphala (A.E.M. Cossmann & M.A. Peyrot, 1921 †) - (ARCHITECTONICIDAE) (FOSSIL)
- micromphala, Bradybaena micromphala (O.F. von Möllendorff, 1899) - (BRADYBAENIDAE)
- micromphala, Kimboraga micromphala (G.P.L.K. Gude, 1907) - (CAMAENIDAE)
- micromphala, Collonia micromphala A.E.M. Cossmann & G. Pissarro † - (COLLONIIDAE) (FOSSIL)
- micromphala, Epitonium micromphala O.A.L. Mörch, 1875 - syn of: Epitonium occidentale (P. Nyst, 1871) - (EPITONIIDAE)
- micromphala, Warthia micromphala (Morris, 1845 †) - (EUPHEMITIDAE) (FOSSIL)
- micromphala, Sonorella micromphala H.A. Pilsbry, 1939 - (HELMINTHOGLYPTIDAE)
- micromphala, Pseuduptonia micromphala Pia, 1913 † - (PHRICODOCERATIDAE) (FOSSIL)
- micromphala, Sobolewia micromphala (F.A. Roemer, 1850 †) - (SOBOLEWIIDAE) (FOSSIL)
- micromphala, Marsenina micromphala L.S.R. Bergh, 1853 - syn of: Marsenina glabra (J.P.Y. Couthouy, 1838) - (VELUTINIDAE)
- Micromphalia, Subgenus Pararhytida (Micromphalia) C.M.F. Ancey, 1882 (CHAROPIDAE)
- Micromphalia, syn of: Genus Stenomphalia W.A. Lindholm, 1927 (HYGROMIIDAE)
- Micromphalina, Subgenus Megalomphalus (Micromphalina) Cossmann, 1888 † (VANIKORIDAE) (FOSSIL)
- Micromphalites, Genus Micromphalites Douvillé, 1916 † (CLYDONICERATIDAE) (FOSSIL)
- micromphalum, Epitonium micromphalum O.A.L. Mörch, 1875 - syn of: Epitonium occidentale (P. Nyst, 1871) - (EPITONIIDAE)
- micromphalus, Agathiceras micromphalus Morris, 1845 † - syn of: Warthia micromphala (Morris, 1845 †) - (AGATHICERATIDAE) (FOSSIL)
- micromphalus, Bellerophon micromphalus Morris, 1845 † - syn of: Warthia micromphala (Morris, 1845 †) - (BELLEROPHONTIDAE) (FOSSIL)
- micromphalus, Bisatoceras micromphalus J.E. McCaleb, 1968 † - (BISATOCERATIDAE) (FOSSIL)
- micromphalus, Chloritis micromphalus H.A. Pilsbry, 1890 - (CAMAENIDAE)
- micromphalus, Micromphalites micromphalus (Phillips, 1871) † - (CLYDONICERATIDAE) (FOSSIL)
- micromphalus, Glaphyrites micromphalus Wagner-Gentis, 1971 † - (GLAPHYRITIDAE) (FOSSIL)
- micromphalus, Goniatites micromphalus Morris, 1845 † - syn of: Warthia micromphala (Morris, 1845 †) - (GONIATITIDAE) (FOSSIL)
- micromphalus, Goniatites micromphalus F.A. Roemer, 1850 † - syn of: Sobolewia micromphala (F.A. Roemer, 1850 †) - (GONIATITIDAE) (FOSSIL)
- micromphalus, Helix micromphalus R.T. Lowe, 1852 - (HELICIDAE)
- micromphalus, Leptostictea leptostictus micromphalus (R.T. Lowe, 1852) - (HYGROMIIDAE)
- micromphalus, Gyraulus micromphalus (A. Fuchs, 1870 ) - (PLANORBIDAE)
- micromphalus, Planorbis micromphalus O.A. Grimm, 1876 - syn of: Anisus eichwaldi (O.A. Grimm in W. Dybowski, 1888) - (PLANORBIDAE)
- micromphalus, Prolecanites micromphalus Mojsisovics 1882 † - (PROLECANITIDAE) (FOSSIL)
- Micromphalus, Genus Micromphalus Knight, 1945 † (TYCHOBRAHEIDAE) (FOSSIL)
- Micromphix, Subgenus Mesomphix (Micromphix) H.A. Pilsbry, 1911 (ZONITIDAE)
- micromurus, Muriceras micromurus Flower, 1964 † - (ELLESMEROCERATIDAE) (FOSSIL)
- Micromya, syn of: Genus Villosa L.S. Frierson, 1927 (UNIONIDAE)
- Micromytilus, syn of: Genus Philobrya P.P. Carpenter, 1872 (PHILOBRYIDAE)
- Micromytilus, syn of: Genus Philobrya P.P. Carpenter, 1872 (PHILOBRYIDAE)
- micron, Cyathopoma micron (H.A. Pilsbry, 1900) - (CYCLOPHORIDAE)
- micron, Bellamya micron T.N. Annandale, 1921 - (VIVIPARIDAE)
- micron iota, Cyathopoma micron iota H.A. Pilsbry & Y. Hirase, 1904 - (CYCLOPHORIDAE)
- Microna, syn of: Genus Bythinella A. Moquin-Tandon, 1855 (BYTHINELLIDAE)
- Microna, syn of: Genus Belgrandiella A. Wagner, 1927 (HYDROBIIDAE)
- Micronaias, Subgenus Cyclonaias (Micronaias) C.T. Simpson, 1900 (UNIONIDAE)
- micronana, Chrysallida micronana B. von Öztürk & J.J. Van Aartsen, 2006 - (PYRAMIDELLIDAE)
- Micronectes, Genus Micronectes Ichikawa & Maeda, 1958 † (PECTINIDAE) (FOSSIL)
- micronema, Pisinna micronema (H.H. Suter, 1898) - (ANABATHRIDAE)
- micronema, Loxobucania micronema Ulrich & Scofield, 1897 † - syn of: Loxobucania lindsleyi (Safford, 1869 †) - (BUCANIIDAE) (FOSSIL)
- micronema, Levicerithium micronema (F.B. Meek †) - (CERITHIIDAE) (FOSSIL)
- micronema, Leucozonia micronema R. Tate, 1888 † - (FASCIOLARIIDAE) (FOSSIL)
- micronema morioria, Pisinna micronema morioria (A.W.B. Powell, 1933) - (ANABATHRIDAE)
- micronematica, Pyrula micronematica J. Brown & H.A. Pilsbry, 1913 † - (MELONGENIDAE) (FOSSIL)
- Micronerita, Genus Micronerita Y. Kano & T. Kase, 2008 (NERITILIIDAE)
- micronesialba, Hemilienardia micronesialba Wiedrick, 2017 - (RAPHITOMIDAE)
- microneta, Drillia microneta J. Gardner, 1937 † - (DRILLIIDAE) (FOSSIL)
- micronitida, Scissodesma micronitida (R. von Cosel, 1995) - (MACTRIDAE)
- Micronoceras, Genus Micronoceras Flower, 1938 † (BREVICOCERATIDAE) (FOSSIL)
- micronodulosa, Gouldia micronodulosa Z. Zhuang, 1964 - syn of: Dorisca jucunda (E.A. Smith, 1885) - (VENERIDAE)
- Micronyassia, syn of: Genus Melanoides G.A. Olivier, 1804 (THIARIDAE)
- microombilicatus, Gyraulus microombilicatus A.V. Grossu, 1987 - syn of: Gyraulus albus (O.F. Müller, 1774) - (PLANORBIDAE)
- Microparmarion, Genus Microparmarion H.R. Simroth, 1893 (ARIOPHANTIDAE)
- micropaviei, Phaedusa micropaviei H. Nordsieck, 2011 - (CLAUSILIIDAE)
- micropeas, Mundiphaedusa micropeas (O.F. von Möllendorff, 1882) - (CLAUSILIIDAE)
- Micropeas, Subgenus Opeas (Micropeas) M.T. Connolly, 1923 (SUBULINIDAE)
- micropeas hohhaidoensis, Mundiphaedusa micropeas hohhaidoensis (H.A. Pilsbry, 1901) - (CLAUSILIIDAE)
- micropeas hokkaidoensis, Mundiphaedusa micropeas hokkaidoensis (H.A. Pilsbry, 1901) - (CLAUSILIIDAE)
- Micropecten, Genus Micropecten H.H. Dijkstra & P. Maestrati, 2012 (CYCLOCHLAMYDIDAE)
- microperforata, Iphiana microperforata A. Peñas & E. Rolán, 2016 - (PYRAMIDELLIDAE)
- microperone, Turbonilla microperone J.C. Melvill, 1904 - (PYRAMIDELLIDAE)
- Micropetasus, syn of: Genus Aulacospira O.F. von Möllendorff, 1890 (HYPSELOSTOMATIDAE)
- Microphaedusa, Genus Microphaedusa H. Nordsieck, 1978 (CLAUSILIIDAE)
- microphallus, Dermatobranchus microphallus T.M. Gosliner & S.J. Fahey, 2011 - (ARMINIDAE)
- Microphiura, syn of: Subgenus Diplomphalus (Microphyura) C.M.F. Ancey, 1882 (RHYTIDIDAE)
- microphthalmus, Octopus microphthalmus C. Goodrich, 1896 - (OCTOPODIDAE)
- microphyllus, Triplex microphyllus (J.B.P.A. Lamarck, 1816) - (MURICIDAE)
- microphyllus akritos, Chicoreus microphyllus akritos G.E. Radwin & D'Attilio, 1976 - syn of: Chicoreus akritos G.E. Radwin & D'Attilio, 1976 - (MURICIDAE)
- microphyma, Cornisepta microphyma (P. Dautzenberg & H. Fischer, 1896) - (FISSURELLIDAE)
- Microphysa, syn of: Genus Hojeda F.C. Baker, 1926 (SAGDIDAE)
- Microphysula, Genus Microphysula T.D.A. Cockerell in H.A. Pilsbry, 1926 (THYSANOPHORIDAE)
- Microphyura, Subgenus Diplomphalus (Microphyura) C.M.F. Ancey, 1882 (RHYTIDIDAE)
- Micropileus, Genus Micropileus Wilson , 1951 † (ARCHAEOPHIALIDAE) (FOSSIL)
- Micropilina, Genus Micropilina A. Warén, 1989 (NEOPILINIDAE)
- MICROPILINIDAE - syn of Family: NEOPILINIDAE
- Micropiliscus, syn of: Genus Haloceras W.H. Dall, 1889 (HALOCERATIDAE)
- micropilosa, Alvania micropilosa S. Gofas, 2007 - (RISSOIDAE)
- Microplax, syn of: Genus Choriplax H.A. Pilsbry, 1894 (CHORIPLACIDAE)
- microplera, Cerithideopsilla cingulata microplera (L.C. Kiener, 1873) - (POTAMIDIDAE)
- micropleura, Lamellidea micropleura C.M. Cooke & Y. Kondo, 1960 - (ACHATINELLIDAE)
- micropleura, Mangelia micropleura R.J.L. Guppy, 1867 † - (MANGELIIDAE) (FOSSIL)
- micropleuros, Macrogastra micropleuros J.R. Bourguignat, 1877 - syn of: Macrogastra ventricosa (J.P.R. Draparnaud, 1801) - (CLAUSILIIDAE)
- micropleuros, Paralaoma micropleuros J. Paget, 1854 - syn of: Paralaoma servilis (R.J. Shuttleworth, 1852) - (PUNCTIDAE)
- Micropleurotoma, Genus Micropleurotoma K.H.J. Thiele, 1931 (HORAICLAVIDAE)
- Micropolia, Genus Micropolia C.F. Laseron, 1953 (NEOLEPTONIDAE)
- micropolitus, Dicharax micropolitus Páll-Gergely & Hunyadi, 2017 - (CYCLOPHORIDAE)
- Micropolyplectus, syn of: Genus Polyplectus Zittel, 1831 † (HILDOCERATIDAE) (FOSSIL)
- micropoma, Buccinum micropoma G.A.W. Thorson, 1944 - (BUCCINIDAE)
- Micropontica, Genus Micropontica O. Böttger, 1881 (CLAUSILIIDAE)
- micropora, Scenella micropora Yü, 1979 † - syn of: Xiadongoconus luminosus Yü, 1979 † - (SCENELLIDAE) (FOSSIL)
- microporata, Entonomenia microporata (C. Handl & L. Salvini-Plawén, 2002) - (RHOPALOMENIIDAE)
- Microprososthenia, Genus Microprososthenia Kadolsky & Piechocki, 2000 † (HYDROBIIDAE) (FOSSIL)
- microps, Limopsis microps Finlay & J. Marwick, 1937 † - (LIMOPSIDAE) (FOSSIL)
- microptera, Modiola microptera G.P. Deshayes, 1836 - syn of: Modiolus modulaides (P.F. Röding, 1798) - (MYTILIDAE)
- microptera, Cerithideopsilla microptera (L.C. Kiener, 1842) - (POTAMIDIDAE)
- microptera, Cerithidea microptera (L.C. Kiener, 1842) - syn of: Cerithideopsilla microptera (L.C. Kiener, 1842) - (POTAMIDIDAE)
- microptera, Pteria microptera G.P. Deshayes, 1830 † - (PTERIIDAE) (FOSSIL)
- microptera, Pterotrachea microptera J.J. Tesch, 1906 - syn of: Pterotrachea coronata P. Forsskål in C. Niebuhr, 1775 - (PTEROTRACHEIDAE)
- micropteris, Modiolus micropteris † - (MYTILIDAE) (FOSSIL)
- micropteroides, Physunio micropteroides T.N. Annandale, 1918 - (UNIONIDAE)
- micropterus, Pterynotus micropterus G.P. Deshayes, 1835 † - (MURICIDAE) (FOSSIL)
- micropterus, Physunio micropterus (P.M.A. Morelet, 1866) - (UNIONIDAE)
- micropteryx, Lamellolucina micropteryx (Cossmann 1920) † - (LUCINIDAE) (FOSSIL)
- Microptychia, syn of: Genus Microptychis Longstaff, 1912 † (PSEUDOZYGOPLEURIDAE) (FOSSIL)
- Microptychis, Genus Microptychis Longstaff, 1912 † (PSEUDOZYGOPLEURIDAE) (FOSSIL)
- micropunctatum, Striaticostatum micropunctatum D.T. Dockery, 1993 † - (EPITONIIDAE) (FOSSIL)
- micropunctatus, Varioconus micropunctatus E. Rolán & D. Röckel, 2000 - (CONIDAE)
- micropustulatus, Leptochiton micropustulatus P. Kaas, 1994 - syn of: Leptochiton micropustulosus P. Kaas, 1994 - (LEPTOCHITONIDAE)
- micropustulosus, Leptochiton micropustulosus P. Kaas, 1994 - (LEPTOCHITONIDAE)
- Micropyrgula, Genus Micropyrgula W. Polinski, 1932 (HYDROBIIDAE)
- micropyrsus, Octopus micropyrsus S.S. Berry, 1953 - (OCTOPODIDAE)
- microreticulatus, Phrixgnathus microreticulatus H.H. Suter, 1890 - (PUNCTIDAE)
- microrhina, Cavellioropa microrhina (H.H. Suter, 1909) - (CHAROPIDAE)
- microrhina, Cuspidaria microrhina W.H. Dall, 1886 - (CUSPIDARIIDAE)
- microrhynchus, Microcystina microrhynchus J.J. Vermeulen, T.S. Liew & M. Schilthuizen, 2015 - (ARIOPHANTIDAE)
- Microrhytis, syn of: Genus Ceratostoma Herrmannsen, 1846 (MURICIDAE)
- micros, Volvarina micros A.R.J.B. Bavay, 1922 - (MARGINELLIDAE)
- micros, Octopus micros M.D. Norman, 2001 - (OCTOPODIDAE)
- Microsachites, syn of: Genus Halkieria Poulsen, 1967 † (HALKIERIIDAE) (FOSSIL)
- Microsagda, Subgenus Hyalosagda (Microsagda) F.C. Baker, 1935 (SAGDIDAE)
- Microsalpinx, syn of: Genus Plagigeyeria J.R. le B. Tomlin, 1930 (HYDROBIIDAE)
- microscelida, Drillia microscelida W.H. Dall, 1895 - syn of: Gemmula microscelida (W.H. Dall, 1895) - (DRILLIIDAE)
- microscelida, Gemmula microscelida (W.H. Dall, 1895) - (TURRIDAE)
- Microschiza, Genus Microschiza Gemmellaro, 1876 † (PSEUDOMELANIIDAE) (FOSSIL)
- Microscintilla, Genus Microscintilla Neubert, 2002 (CERASTUIDAE)
- Microsconsia, Genus Microsconsia A.G. Beu, 2008 (CASSIDAE)
- microscopica, Aclis microscopica (W.L. May, 1911) - (ACLIDIDAE)
- microscopica, Microcancilla microscopica (W.H. Dall, 1889) - (CANCELLARIIDAE)
- microscopica, Cancellaria microscopica W.H. Dall, 1889 - syn of: Microcancilla microscopica (W.H. Dall, 1889) - (CANCELLARIIDAE)
- microscopica, Coliracemata microscopica (G. Nevill, 1877) - (CLENCHIELLIDAE)
- microscopica, Clenchiella microscopica G. Nevill, 1877 - syn of: Coliracemata microscopica (G. Nevill, 1877) - (CLENCHIELLIDAE)
- microscopica, Gibberula microscopica C.M. Tapparone-Canefri, 1875 - (CYSTISCIDAE)
- microscopica, Gastrocopta microscopica (E.C. Von Martens, 1898) - (GASTROCOPTIDAE)
- microscopica, Marginella microscopica W.L. May, 1911 - syn of: Balanetta cylichnella (W.L. May, 1918) - (MARGINELLIDAE)
- microscopica, Balanetta microscopica W.L. May, 1911 - syn of: Balanetta cylichnella (W.L. May, 1918) - (MARGINELLIDAE)
- microscopica, Turritellopsis microscopica W.L. May, 1911 - (MATHILDIDAE)
- microscopica, Leda microscopica T.A. de M. Monterosato, 1875 - syn of: Microgloma pusilla (J.G. Jeffreys, 1879) - (NUCULANIDAE)
- microscopica, Pyrgiscus microscopica C.F. Laseron, 1959 - syn of: Turbonilla mumia microscopica (C.B. Adams, 1861) - (PYRAMIDELLIDAE)
- microscopica, Turbonilla mumia microscopica (C.B. Adams, 1861) - (PYRAMIDELLIDAE)
- microscopica, Nepotilla microscopica (W.L. May, 1916) - (RAPHITOMIDAE)
- microscopica, Taranis microscopica W.L. May, 1916 - syn of: Nepotilla microscopica (W.L. May, 1916) - (RAPHITOMIDAE)
- microscopica, Lucidestea microscopica (K.H.J. Thiele, 1925) - (RISSOIDAE)
- microscopica, Cirsonella microscopica (J.H. Gatliff & C.J. Gabriel, 1910) - (SKENEIDAE)
- microscopica, Stenothyra microscopica A.E.M. Cossmann 1883 - (STENOTHYRIDAE)
- microscopica, Turritella microscopica W.L. May, 1911 - syn of: Aclis microscopica (W.L. May, 1911) - (TURRITELLIDAE)
- microscopica, Yoldia microscopica T.A. de M. Monterosato, 1878 - syn of: Microgloma pusilla (J.G. Jeffreys, 1879) - (YOLDIIDAE)
- microscopicum, Cyclostrema microscopicum J.H. Gatliff & C.J. Gabriel, 1910 - syn of: Cirsonella microscopica (J.H. Gatliff & C.J. Gabriel, 1910) - (LIOTIIDAE)
- microscopium, Bassleroceras microscopium (Dwight, 1884 †) - (BASSLEROCERATIDAE) (FOSSIL)
- microsculpta, Assiminea microsculpta G. Nevill, 1880 - (ASSIMINEIDAE)
- microsculpta, Melanella microsculpta P. Bouchet & A. Warén, 1986 - (EULIMIDAE)
- microsculpta, Brotia microsculpta R.A.M. Brandt, 1968 - (PACHYCHILIDAE)
- microsculpta, Hubendickia microsculpta (R.A.M. Brandt, 1968) - syn of: Stenothyra microsculpta (R.A.M. Brandt, 1968) - (POMATIOPSIDAE)
- microsculpta, Poromya microsculpta R.K. Dell, 1995 - (POROMYIDAE)
- microsculpta, Parthenina microsculpta Peñas & Rolán, 2017 - (PYRAMIDELLIDAE)
- microsculpta, Stenothyra microsculpta (R.A.M. Brandt, 1968) - (STENOTHYRIDAE)
- microsculpta, Thapsia microsculpta B. Verdcourt - (UROCYCLIDAE)
- microsculpturatus, Circulus microsculpturatus P.G. Oliver & E. Rolán, 2011 - (TORNIDAE)
- Microsetia, syn of: Genus Eatonina K.H.J. Thiele, 1912 (CINGULOPSIDAE)
- microsicya, Eledone microsicya A. de Rochebrune, 1884 - (OCTOPODIDAE)
- microsolen, Neomenia microsolen A. Wirén, 1892 - (NEOMENIIDAE)
- microsoma, Admete microsoma (W.H. Dall, 1908) - (CANCELLARIIDAE)
- microsoma, Kaliella microsoma J.J. Vermeulen, T.S. Liew & M. Schilthuizen, 2015 - (CHRONIDAE)
- microsoma, Parviscala microsoma C.M. Tapparone-Canefri, 1876 - syn of: Epitonium subauriculatum (S.M. Souverbie, 1866) - (EPITONIIDAE)
- microsoma, Cataschisma microsoma E.F.R.K. Koken & J. Perner, 1925 † - (GOSSELETINIDAE) (FOSSIL)
- microsperma, Nucula microsperma S.S. Berry, 1947 - syn of: Ennucula tenuis (G. Montagu, 1808) - (NUCULIDAE)
- microsperna, Nucula microsperna S.S. Berry, 1947 - syn of: Ennucula tenuis (G. Montagu, 1808) - (NUCULIDAE)
- microsphaera, Isthmia microsphaera (A.A. Schileyko, 1984) - (VERTIGINIDAE)
- microsphaerica, Austrocypraea reevei microsphaerica L. Raybaudi Massilia, 1980 - (CYPRAEIDAE)
- microspinosus, Babelomurex microspinosus S. Kosuge, 1988 - (MURICIDAE)
- microspira, Platyla microspira N. Pini, 1884 - (ACICULIDAE)
- microspira, Melampus microspira H.A. Pilsbry, 1891 - syn of: Melampus coffea (C. Linnaeus, 1758) - (ELLOBIIDAE)
- Microspira, Subgenus Prunum (Microspira) Conrad, 1868 † (MARGINELLIDAE) (FOSSIL)
- Microspira, syn of: Genus Marginella J.B.P.A. Lamarck, 1799 (MARGINELLIDAE)
- microspira, Olivella microspira G. Paulmier, 2007 - (OLIVELLIDAE)
- microspira, Succinea virgata microspira E.C. Von Martens, 1865 - (SUCCINEIDAE)
- microspiralis, Acteon microspiralis A. Oleinik, 1991 † - (ACTEONIDAE) (FOSSIL)
- microspiralis, Australdonta microspiralis G. Zimmermann, O. Gargominy & Fontaine, 2009 - (ENDODONTIDAE)
- microspiralis, Halolimnohelix microspiralis (H.B. Preston) - (HALOLIMNOHELICIDAE)
- microspirula, Girtyspira microspirula Jeffery & al., 1994 † - (MEEKOSPIRIDAE) (FOSSIL)
- microspirulata, Araeonema microspirulata E.K. Yoo, 1994 † - (ARAEONEMATIDAE) (FOSSIL)
- microspirulata, Pseudoaclisina microspirulata E.K. Yoo, 1994 † - (MURCHISONELLIDAE) (FOSSIL)
- microspora, Columella microspora (R.T. Lowe, 1852) - (VERTIGINIDAE)
- microspora, Columella microspora J.A. Albers, 1854 - syn of: Columella edentula (J.P.R. Draparnaud, 1805) - (VERTIGINIDAE)
- Microstagon, Subgenus Diplodonta (Microstagon) Cossmann, 1896 † (UNGULINIDAE) (FOSSIL)
- Microstagon, syn of: Genus Diplodonta H.G. Bronn, 1831 (UNGULINIDAE)
- microstatus, Bathyomphalus microstatus (J.R. Bourguignat, 1881) - (PLANORBIDAE)
- Microstele, Genus Microstele O. Böttger, 1886 (PUPILLIDAE)
- Microstelma, Genus Microstelma A. Adams, 1863 (ZEBINIDAE)
- microsticta, Diodora microsticta W.H. Dall, 1927 - syn of: Diodora cayenensis J.B.P.A. Lamarck, 1822 - (FISSURELLIDAE)
- microsticta, Lophiotoma microsticta T.L. Casey, 1904 - syn of: Lophiotoma acuta (G. Perry, 1811) - (TURRIDAE)
- microsticta, Lamprotula microsticta (P.M. Heude, 1877) - (UNIONIDAE)
- Microstilifer, Genus Microstilifer A. Warén, 1980 (EULIMIDAE)
- microstira, Sinum microstira R. Tate, 1893 † - (NATICIDAE) (FOSSIL)
- microstoma, Lamellidea microstoma (J.F. Quadras & O.F. von Möllendorff, 1894) - (ACHATINELLIDAE)
- microstoma, Achatinella microstoma A.A. Gould - syn of: Amastra textilis (A.E.J. Férussac, 1825) - (ACHATINELLIDAE)
- microstoma, Caelatura microstoma (R.B. Watson, 1886) - (BARLEEIIDAE)
- microstoma, Semicassis microstoma (E.C. Von Martens, 1903) - (CASSIDAE)
- microstoma, Phalium microstoma E.C. Von Martens, 1903 - syn of: Semicassis microstoma (E.C. Von Martens, 1903) - (CASSIDAE)
- microstoma, Chondrina microstoma C. Altimira, 1961 - syn of: Chondrina arigonis E.A. Rossmässler, 1859 - (CHONDRINIDAE)
- microstoma, Alopia microstoma M. von Kimakowicz, 1883 - (CLAUSILIIDAE)
- microstoma, Zafra microstoma (K.H.J. Thiele, 1925) - (COLUMBELLIDAE)
- microstoma, Columbella microstoma K.H.J. Thiele, 1925 - syn of: Zafra microstoma (K.H.J. Thiele, 1925) - (COLUMBELLIDAE)
- microstoma, Sinoennea microstoma (O.F. von Möllendorff, 1881) - (DIAPHERIDAE)
- microstoma, Gomphoceras microstoma Barrande, 1865 † - syn of: Ovocerina microstoma (Barrande, 1865 †) - (DIESTOCERATIDAE) (FOSSIL)
- microstoma, Ovatella microstoma H.C. Küster, 1844 - syn of: Myosotella myosotis (J.P.R. Draparnaud, 1801) - (ELLOBIIDAE)
- microstoma, Parvioris microstoma Š. Brusina, 1864 - syn of: Parvioris ibizenca (F. Nordsieck, 1968) - (EULIMIDAE)
- microstoma, Peristernia microstoma H.C. Küster & W. Kobelt, 1876 - syn of: Peristernia nassatula (J.B.P.A. Lamarck, 1822) - (FASCIOLARIIDAE)
- microstoma, Alcadia microstoma (C.B. Adams, 1850) - (HELICINIDAE)
- microstoma, Hexameroceras microstoma Ruedemann, 1916 † - (HEMIPHRAGMOCERATIDAE) (FOSSIL)
- microstoma, Alzoniella microstoma M. Bodon & S. Cianfanelli, 2002 - (HYDROBIIDAE)
- microstoma, Ovocerina microstoma (Barrande, 1865 †) - (MANDALOCERATIDAE) (FOSSIL)
- microstoma, Melanopsis microstoma J.R. Bourguignat, 1884 - (MELANOPSIDAE)
- microstoma, Strigatella microstoma G.B. Sowerby, 1874 - syn of: Strigatella pellisserpentis L.A. Reeve, 1844 - (MITRIDAE)
- microstoma, Nassa microstoma Wood, 1842 † - (MURICIDAE) (FOSSIL)
- Microstoma, syn of: Genus Plicopurpura A.E.M. Cossmann, 1903 (MURICIDAE)
- microstoma, Nassa microstoma W.H. Pease, 1860 † - syn of: Reticunassa paupera (A.A. Gould, 1850 †) - (NASSARIIDAE) (FOSSIL)
- microstoma, Natica microstoma J.R.C. Quoy & J.P. Gaimard, 1833 - syn of: Conuber sordidum (W.J. Swainson, 1821) - (NATICIDAE)
- microstoma, Conuber microstoma J.R.C. Quoy & J.P. Gaimard, 1833 - syn of: Conuber sordidum (W.J. Swainson, 1821) - (NATICIDAE)
- microstoma, Neritina microstoma D'Orbigny, 1842 - syn of: Neritina usnea (P.F. Röding, 1798) - (NERITIDAE)
- microstoma, Partula microstoma W.H. Pease - (PARTULIDAE)
- microstoma, Physella gyrina microstoma (S.S. Haldeman, 1840) - (PHYSIDAE)
- microstoma, Bouryia microstoma (G.P. Deshayes, 1824 †) - (POMATIOPSIDAE) (FOSSIL)
- microstoma, Tricula microstoma Y.Y. Liu, W.Z. Zhang & Y.X. Wang, 1983 - (POMATIOPSIDAE)
- microstoma, Zaibinkangia microstoma (Z. Kang, 1986) - (POMATIOPSIDAE)
- microstoma, Crassispira microstoma E.A. Smith, 1882 - (PSEUDOMELATOMIDAE)
- microstoma, Charonia microstoma A.E.M. Cossmann & G. Pissarro † - (RANELLIDAE) (FOSSIL)
- microstoma, Biplex microstoma H.C. Fulton, 1930 - syn of: Biplex aculeata (M.M. Schepman, 1909) - (RANELLIDAE)
- microstoma, Thierachella microstoma J.C. Fischer, 1969 † - (RISSOIDAE) (FOSSIL)
- microstoma, Elma microstoma O.F. von Möllendorff, 1881 - syn of: Sinoennea microstoma (O.F. von Möllendorff, 1881) - (STREPTAXIDAE)
- microstoma, Obeliscus microstoma (J. Gundlach in L. Pfeiffer, 1863) - (SUBULINIDAE)
- microstoma, Kheraiceras microstoma (A.V.M.D. D'Orbigny, 1846 †) - (TULITIDAE) (FOSSIL)
- microstoma, Coelostemma microstoma (L. Pfeiffer, 1861) - (UROCOPTIDAE)
- microstoma coronata, Alopia microstoma coronata M. von Kimakowicz, 1883 - (CLAUSILIIDAE)
- microstoma grossuana, Alopia microstoma grossuana H. Nordsieck, 1977 - syn of: Alopia grossuana H. Nordsieck, 1977 - (CLAUSILIIDAE)
- microstoma ibizenca, Balcis microstoma ibizenca F. Nordsieck, 1968 - syn of: Parvioris ibizenca (F. Nordsieck, 1968) - (EULIMIDAE)
- microstoma moellendorffiana, Lamellidea microstoma moellendorffiana H.A. Pilsbry & C.M. Cooke, 1915 - (ACHATINELLIDAE)
- microstoma nordsiecki, Alopia microstoma nordsiecki A.V. Grossu & Tessio, 1973 - (CLAUSILIIDAE)
- microstoma soosi, Alopia microstoma soosi R.A.M. Brandt, 1961 - syn of: Alopia hildegardae soosi R.A.M. Brandt, 1961 - (CLAUSILIIDAE)
- Microstomiceras, Genus Microstomiceras King , 1998 † (CYCLOSTOMICERATIDAE) (FOSSIL)
- microstomum, Cerion microstomum (L. Pfeiffer, 1854) - (CERIONIDAE)
- microstomum cardenese, Cerion microstomum cardenese C.G. Aguayo & M.I. Sánchez Roig, 1953 - (CERIONIDAE)
- microstomus, Octopus microstomus Reynaud, 1830 - syn of: Tremoctopus violaceus S. Delle Chiaje, 1830 - (OCTOPODIDAE)
- microstria, Dentalium microstria A. Heilprin, 1880 † - (DENTALIIDAE) (FOSSIL)
- microstriae, Herewardia microstriae Peñas & Rolán, 2017 - (PYRAMIDELLIDAE)
- microstriata, Anomia microstriata D.T. Dockery, 1982 † - (ANOMIIDAE) (FOSSIL)
- microstriata, Waagenella microstriata P.A. Maxwell, 1961 † - (BELLEROPHONTIDAE) (FOSSIL)
- microstriata, Plesioacirsa microstriata (B. Wade, 1917 †) - (EPITONIIDAE) (FOSSIL)
- microstriata, Remera microstriata L.W. Stephenson, 1941 † - (FASCIOLARIIDAE) (FOSSIL)
- microstriata, Mathewsoconcha microstriata H.B. Preston, 1913 - (HELICARIONIDAE)
- microstriata, Cheilea microstriata K.H. Barnard, 1958 - (HIPPONICIDAE)
- microstriata, Angulathilda microstriata (F. Schröder, 1995 †) - (MATHILDIDAE) (FOSSIL)
- microstriata, Carinathilda microstriata F. Schröder, 1995 † - syn of: Angulathilda microstriata (F. Schröder, 1995 †) - (MATHILDIDAE) (FOSSIL)
- microstriata, Deussenia microstriata (B. Wade, 1926 †) - (MELONGENIDAE) (FOSSIL)
- microstriata, Hummelgauia microstriata Schulbert & A. Nützel, 2013 † - (MURCHISONELLIDAE) (FOSSIL)
- microstriata, Physa microstriata J.L. Chamberlin & S.S. Berry, 1930 - (PHYSIDAE)
- microstriata, Bouchetmella microstriata A. Peñas & E. Rolán, 2016 - (PYRAMIDELLIDAE)
- microstriata, Pyrgulina microstriata Peñas & Rolán, 2017 - (PYRAMIDELLIDAE)
- microstriata, Alvania microstriata H.J. Hoenselaar & J. Goud, 1998 - (RISSOIDAE)
- microstriata, Powellisetia microstriata (R. Murdoch, 1905) - (RISSOIDAE)
- microstriata, Gulella microstriata K.C. Emberton, 2001 - (STREPTAXIDAE)
- microstriatula, Kellia microstriatula Garvie, 2013 † - (KELLIIDAE) (FOSSIL)
- microstriatum, Allepithema microstriatum J.T. Kuroda & T. Kano, 1941 - (ASSIMINEIDAE)
- microstriatum, Caecum microstriatum M. Pizzini, B.K. Raines & A. Vannozzi, 2013 - (CAECIDAE)
- microstriatum, Sinuber microstriatum R.K. Dell, 1990 - (NATICIDAE)
- microstriatus, Cyclostremiscus microstriatus F. Rubio, E. Rolán & Y.C. Lee, 2011 - (TORNIDAE)
- microstriolatus, Malagarion microstriolatus K.C. Emberton, 1994 - (ARIOPHANTIDAE)
- Microstrophia, Subgenus Gonospira (Microstrophia) O.F. von Möllendorff, 1887 (STREPTAXIDAE)
- Microstygia, Genus Microstygia Georgiev & Glöer, 2015 (HYDROBIIDAE)
- Microstylodonta, syn of: Genus Erepta J.A. Albers, 1850 (HELICARIONIDAE)
- microstylus, Belemnites microstylus B. Phillips, 1867 † - syn of: Hastites microstylus (B. Phillips, 1867 †) - (BELEMNITELLIDAE) (FOSSIL)
- microstylus, Hastites microstylus (B. Phillips, 1867 †) - (HASTITIDAE) (FOSSIL)
- Microsulcatoceras, Genus Microsulcatoceras Kennedy & Cobban, 1990 † (ACANTHOCERATIDAE) (FOSSIL)
- microsulci, Glycymeris microsulci B. Wade, 1926 † - (GLYCYMERIDIDAE) (FOSSIL)
- microsulci, Panopea microsulci (B. Wade, 1926 †) - (HIATELLIDAE) (FOSSIL)
- Microsurcula, Genus Microsurcula Casey, 1904 † (COCHLESPIRIDAE) (FOSSIL)
- Microsveltia, Genus Microsveltia T. Iredale, 1925 (CANCELLARIIDAE)
- Microtaphrus, syn of: Genus Pseudotaphrus Cossmann, 1888 † (ZEBINIDAE) (FOSSIL)
- microtatum, Microcardium microtatum W.P. Woodring, 1982 † - (CARDIIDAE) (FOSSIL)
- microtera, Anadara microtera W.P. Woodring, 1925 † - (ARCIDAE) (FOSSIL)
- microtesta, Socenia microtesta (Papp, 1954 †) - (HYDROBIIDAE) (FOSSIL)
- Microteuthis, syn of: Genus Idiosepius J.J.S. Steenstrup, 1881 (IDIOSEPIIDAE)
- microthauma, Potamolithus microthauma H.A. Pilsbry, 1896 - (LITHOGLYPHIDAE)
- microthauma, Lyropupa microthauma C.M.F. Ancey, 1904 - (VERTIGINIDAE)
- microtheca, Ogasawarana yoshiwarana microtheca (H.A. Pilsbry, 1902) - (HELICINIDAE)
- Microthyca, Genus Microthyca A. Adams, 1863 (TORNIDAE)
- microthyra, Pisinna microthyra E.C. Von Martens, 1880 - syn of: Barleeia microthyra (E.C. Von Martens, 1880) - (ANABATHRIDAE)
- microthyra, Barleeia microthyra (E.C. Von Martens, 1880) - (BARLEEIIDAE)
- microthyra, Atractophaedusa rhopaloides microthyra (O.F. von Möllendorff, 1901) - (CLAUSILIIDAE)
- Microtina, syn of: Genus Stomatia G.S. Helbling, 1779 (TROCHIDAE)
- microtis, Entolium microtis Bittner, 1899 † - (ENTOLIIDAE) (FOSSIL)
- Microtis, Genus Microtis A. Adams, 1850 (TROCHIDAE)
- Microtoma, syn of: Genus Plicopurpura A.E.M. Cossmann, 1903 (MURICIDAE)
- microtomoides, Eothesbia microtomoides Finlay & J. Marwick, 1937 † - (CONOIDEA (UNASSIGNED)) (FOSSIL)
- microtraga sunzhica, Chondrula microtraga sunzhica Steklov, 1962 - syn of: Chondrula sunzhica Steklov, 1962 - (ENIDAE)
- microtragus, Chondrula microtragus E.A. Rossmässler, 1839 - (ENIDAE)
- microtragus tricuspidata, Chondrula microtragus tricuspidata H.C. Küster, 1846 - (ENIDAE)
- Microtralia, Genus Microtralia W.H. Dall, 1894 (ELLOBIIDAE)
- microtrema, Fissurella microtrema G.B. I Sowerby, 1835 - (FISSURELLIDAE)
- microtricha, Chloritis microtricha (O.F. von Möllendorff, 1898) - (CAMAENIDAE)
- microtricha, Naticopsis microtricha (A. Römer, 1843 †) - (DELPHINULOPSIDAE) (FOSSIL)
- microtricha, Eutheba microtricha (S.G.A. Jaeckel, 1954) - (HYGROMIIDAE)
- microtricha, Pyrula microtricha A. Römer, 1843 † - (MELONGENIDAE) (FOSSIL)
- Microtrigonia, syn of: Genus Nuraya Özdikmen & Akbulut, 2010 † (MEGATRIGONIIDAE) (FOSSIL)
- microtrochus, Choanomphalus microtrochus W.A. Lindholm, 1909 - (PLANORBIDAE)
- Microtropites, Genus Microtropites Mojsisovics, 1893 † (TROPITIDAE) (FOSSIL)
- Microtrypetes, Subgenus Terebra (Microtrypetes) Pilbry & Lowe, 1932 † (TEREBRIDAE) (FOSSIL)
- Microtrypetes, syn of: Genus Terebra J.G. Bruguière, 1789 (TEREBRIDAE)
- microtuberculata, Alvania microtuberculata S. Gofas, 2007 - (RISSOIDAE)
- microtuberus, Anhuiconus microtuberus W.C. Zhou & Q. Xiao, 1984 † - (HELCIONELLIDAE) (FOSSIL)
- microtuberus, Anchuispira microtuberus S.Y. Feng, 1994 † - syn of: Anhuiconus microtuberus W.C. Zhou & Q. Xiao, 1984 † - (HELCIONELLIDAE) (FOSSIL)
- microtumida, Chevallieria microtumida P. Lozouet, 1999 † - (IRAVADIIDAE) (FOSSIL)
- microturbinata, Pupisoma microturbinata J. Stanisic, 2010 - (VERTIGINIDAE)
- microturritella, Dyris microturritella Wesselingh, 2006 † - (COCHLIOPIDAE) (FOSSIL)
- microtypica, Cretica virginea microtypica A.J. Wagner, 1924 - (CLAUSILIIDAE)
- microumbilicata, Chaureopa microumbilicata F.M. Climo, 1985 - (CHAROPIDAE)
- microumbilicatus, Nevadaphyllites microumbilicatus Taylor, 1998 † - (JURAPHYLLITIDAE) (FOSSIL)
- microundulatum, Huonodon microundulatum (H.H. Suter, 1890) - (CHAROPIDAE)
- microundulatum, Ptychodon microundulatum H.H. Suter, 1890 - syn of: Huonodon microundulatum (H.H. Suter, 1890) - (CHAROPIDAE)
- microurceus, Canarium microurceus T. Kira, 1959 - (STROMBIDAE)
- Microveronicella, Genus Microveronicella J.W. Thomé, 1976 (VERONICELLIDAE)
- Microvexillum, syn of: Genus Kuphus J.É. Guettard, 1770 (TEREDINIDAE)
- Microviana, Subgenus Eutrochatella (Microviana) F.C. Baker, 1928 (HELICINIDAE)
- microvoluta, Oenopota microvoluta T.A. Okutani, 1964 - syn of: Oenopota candida (M. Yokoyama, 1926) - (MANGELIIDAE)
- microvoluta, Curtitoma microvoluta T.A. Okutani, 1964 - syn of: Oenopota candida (M. Yokoyama, 1926) - (MANGELIIDAE)
- Microvoluta, Genus Microvoluta G.F. Angas, 1877 (VOLUTOMITRIDAE)
- Microvulina, syn of: Genus Crithe A. Gould, 1860 (CYSTISCIDAE)
- Microwomiceras, Genus Microwomiceras † (ELLESMEROCERIDA (UNASSIGNED)) (FOSSIL)
- Microxeromagna, Subgenus Cernuella (Microxeromagna) A. Ortiz De Zárate, 1950 (HYGROMIIDAE)
- Microyoldia, syn of: Genus Megayoldia A.E. Verrill & K.J. Bush, 1897 (YOLDIIDAE)
- microzonias, Pusia microzonias (J.B.P.A. Lamarck, 1811) - (COSTELLARIIDAE)
- microzonias, Mitra microzonias auct. non J.B.P.A. Lamarck, 1811 - syn of: Pusia histrio (L.A. Reeve, 1844) - (MITRIDAE)
- microzonias bilineata, Vexillum microzonias bilineata L.A. Reeve, 1845 - syn of: Protoelongata bilineata (L.A. Reeve, 1845) - (COSTELLARIIDAE)
- micrum, Salaputium micrum (J.C. Verco, 1895) - (CRASSATELLIDAE)
- micrum, Graphoceras micrum (Buckman, 1901 †) - (GRAPHOCERATIDAE) (FOSSIL)
- micula, Kaliella micula (A. Mousson, 1857) - (CHRONIDAE)
- micula, Donaldina micula Longst, 1917 † - syn of: Donaldina costatula (J. Donald, 1885 †) - (DONALDINIDAE) (FOSSIL)
- micula, Anematina micula (Girty, 1909 †) - (ELASMONEMATIDAE) (FOSSIL)
- micula, Liospira micula (J.W. Hall & A. Whitney, 1862 †) - (EOTOMARIIDAE) (FOSSIL)
- micula, Bembexia micula Tassell, 1982 † - (EOTOMARIIDAE) (FOSSIL)
- micula, Murchisonia micula Miller, 1877 † - (MURCHISONIIDAE) (FOSSIL)
- micula, Mirilentia micula Ruzhentsev & Bogoslovskaya, 1971 † - (NEOGLYPHIOCERATIDAE) (FOSSIL)
- micula, Olivella micula (F.P. Marrat, 1871) - (OLIVELLIDAE)
- micula, Oliva micula F.P. Marrat, 1871 - syn of: Olivella micula (F.P. Marrat, 1871) - (OLIVIDAE)
- micula, Pleurotomaria micula J.W. Hall & A. Whitney, 1862 † - syn of: Liospira micula (J.W. Hall & A. Whitney, 1862 †) - (PLEUROTOMARIIDAE) (FOSSIL)
- micula, Pupilla micula A. Mousson, 1876 - syn of: Truncatellina cylindrica (A.E.J. Férussac, 1807) - (PUPILLIDAE)
- micula, Rakiurapyrgus micula M. Haase, 2008 - (TATEIDAE)
- micula, Truncatellina micula A. Mousson, 1876 - syn of: Truncatellina cylindrica (A.E.J. Férussac, 1807) - (VERTIGINIDAE)
- miculus, Antillophos miculus K. Fraussen & G.T. Poppe, 2005 - (NASSARIIDAE)
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