- irma, Pyrgiscus irma (K.H.J. Thiele, 1925) - (PYRAMIDELLIDAE)
- irma, Rissoella irma (P. Bartsch, 1915) - (RISSOELLIDAE)
- irmengardis, Montenegrina rugilabris irmengardis (M. Klemm, 1962) - (CLAUSILIIDAE)
- irmengardis edmundi, Montenegrina irmengardis edmundi M. Szekeres, 2006 - syn of: Montenegrina rugilabris edmundi M. Szekeres, 2006 - (CLAUSILIIDAE)
- irmengardis ersekensis, Montenegrina irmengardis ersekensis H. Nordsieck, 1996 - syn of: Montenegrina skipetarica ersekensis H. Nordsieck, 1996 - (CLAUSILIIDAE)
- irmengardis flava, Montenegrina irmengardis flava Z. Eröss & M. Szekeres, 2006 - syn of: Montenegrina skipetarica flava Z. Eröss & M. Szekeres, 2006 - (CLAUSILIIDAE)
- irmengardis rugosa, Montenegrina irmengardis rugosa Z. Fehér & M. Szekeres, 2006 - syn of: Montenegrina skipetarica rugosa Z. Fehér & M. Szekeres, 2006 - (CLAUSILIIDAE)
- irmengardis timeae, Montenegrina irmengardis timeae Z. Eröss & M. Szekeres, 2006 - syn of: Montenegrina timeae Z. Eröss & M. Szekeres, 2006 - (CLAUSILIIDAE)
- irmengardis voidomatis, Montenegrina irmengardis voidomatis H. Nordsieck, 1974 - syn of: Montenegrina skipetarica voidomatis H. Nordsieck, 1974 - (CLAUSILIIDAE)
- irondalensis, Irondalia irondalensis Stinchcomb & Angeli, 2002 † - (PROPLINIDAE) (FOSSIL)
- Irondalia, Genus Irondalia Stinchcomb & Angeli, 2002 † (PROPLINIDAE) (FOSSIL)
- irpex, Divaricella irpex (Smith, 1885) - (LUCINIDAE)
- irpina, Ambigua fuscolabiata irpina (W. Kobelt, 1903) - (HELICIDAE)
- irplex, Divaricella irplex E.A. Smith, 1885 - syn of: Divaricella irpex (Smith, 1885) - (LUCINIDAE)
- irradians, Ratnadvipia irradians (L. Pfeiffer, 1853) - (ARIOPHANTIDAE)
- irradians, Argopecten irradians (J.B.P.A. Lamarck, 1819) - (PECTINIDAE)
- irradians, Chondropoma irradians (R.J. Shuttleworth in L. Pfeiffer, 1852) - (POMATIIDAE)
- irradians, Pteria irradians L.A. Reeve, 1857 - syn of: Pinctada albina (J.B.P.A. Lamarck, 1819) - (PTERIIDAE)
- irradians, Pinctada irradians L.A. Reeve, 1857 - syn of: Pinctada albina (J.B.P.A. Lamarck, 1819) - (PTERIIDAE)
- irradians amplicostatus, Argopecten irradians amplicostatus (W.H. Dall, 1898) - (PECTINIDAE)
- irradians camaronense, Chondropoma irradians camaronense C. de la Torre & P. Bartsch, 1938 - (POMATIIDAE)
- irradians candicans, Chondropoma irradians candicans C. de la Torre & P. Bartsch, 1938 - (POMATIIDAE)
- irradians concentricus, Argopecten irradians concentricus (T. Say, 1822) - (PECTINIDAE)
- irradians figuroense, Chondropoma irradians figuroense C. de la Torre & P. Bartsch, 1938 - (POMATIIDAE)
- irradians palenquense, Chondropoma irradians palenquense C. de la Torre & P. Bartsch, 1938 - (POMATIIDAE)
- irradians panense, Chondropoma irradians panense C. de la Torre & P. Bartsch, 1938 - (POMATIIDAE)
- irradians sablensis, Argopecten irradians sablensis A.H. Clarke, 1965 - (PECTINIDAE)
- irradians taylorae, Argopecten irradians taylorae E.J. Petuch, 1987 - (PECTINIDAE)
- irradiata, Erycina irradiata A.E.M. Cossmann, 1892 † - (LASAEIDAE) (FOSSIL)
- irradiata, Nuculana irradiata (G.B. II Sowerby, 1870) - (NUCULANIDAE)
- irradiata, Diplodonta irradiata A.E.M. Cossmann, 1887 † - (UNGULINIDAE) (FOSSIL)
- irradiata, Mysia irradiata A.E.M. Cossmann, 1887 † - (VENERIDAE) (FOSSIL)
- irrasa, Discula irrasa R.T. Lowe, 1831 - syn of: Discula polymorpha (R.T. Lowe, 1831) - (HYGROMIIDAE)
- irrasum, Platyostoma irrasum Fenton & Fenton, 1924 † - (PLATYCERATIDAE) (FOSSIL)
- irrasum, Pleurobema irrasum I. Lea, 1861 - syn of: Pleurobema rubellum T.A. Conrad, 1834 - (UNIONIDAE)
- irrasus, Unio irrasus I. Lea, 1861 - syn of: Pleurobema georgianum I. Lea, 1841 - (UNIONIDAE)
- irravadica, Genota irravadica Noetling, 1895 † - (BORSONIIDAE) (FOSSIL)
- irrediviva, Nesiohelix irrediviva (H.A. Pilsbry & Y. Hirase, 1904) - (BRADYBAENIDAE)
- irrediviva yorojimaensis, Nesiohelix irrediviva yorojimaensis M. Azuma, 1990 - (BRADYBAENIDAE)
- irregulare, Burroceras irregulare Cobban, Hook & J. Kennedy, 1989 † - (ACANTHOCERATIDAE) (FOSSIL)
- irregulare, Australiceras irregulare (J.E. Tenison-Woods, 1883 †) - (ANCYLOCERATIDAE) (FOSSIL)
- irregulare, Elobiceras irregulare Spath, 1922 † - (BRANCOCERATIDAE) (FOSSIL)
- irregulare, Oxyprora irregulare de Koninck, 1844 † - syn of: Oxyprora digitatum (R.M. Branson, 1942 †) - (BRANSONIIDAE) (FOSSIL)
- irregulare, Caecum irregulare L. de Folin, 1867 - (CAECIDAE)
- irregulare, Rayonnoceras irregulare Schwarzbach, 1937 † - (CARBACTINOCERATIDAE) (FOSSIL)
- irregulare, Amoebites irregulare Spath, 1935 † - syn of: Amoebites kitchini (Salfeld, 1915 †) - (CARDIOCERATIDAE) (FOSSIL)
- irregulare, Cerion glans irregulare H.P. Plate, 1907 - (CERIONIDAE)
- irregulare, Miltoceras irregulare (G. Rosenberg, 1909 †) - (COELOCERATIDAE) (FOSSIL)
- irregulare, Crioceras irregulare J.E. Tenison-Woods, 1883 † - syn of: Australiceras irregulare (J.E. Tenison-Woods, 1883 †) - (CRIOCERATITIDAE) (FOSSIL)
- irregulare, Antacaroceras irregulare B.Z. Li, 1984 † - (ELLESMEROCERIDA (UNASSIGNED)) (FOSSIL)
- irregulare, Epitonium irregulare (G.B. II Sowerby, 1844) - (EPITONIIDAE)
- irregulare, Buroceras irregulare Cobban, Hook & J. Kennedy, 1989 † - (KOSSMATICERATIDAE) (FOSSIL)
- irregulare, Incidostoma irregulare (L. Pfeiffer, 1855) - (NEOCYCLOTIDAE)
- irregulare, Nostoceras irregulare Cobban & Kennedy, 1995 † - (NOSTOCERATIDAE) (FOSSIL)
- irregulare, Tofangoceras irregulare T. Kobayashi, 1928 † - (PROTEOCERATIDAE) (FOSSIL)
- irregulare, Scalites irregulare Kobayashi, 1958 † - (RAPHISTOMATIDAE) (FOSSIL)
- irregulare, Dendropoma irregulare (A.V.M.D. D'Orbigny, 1841) - (VERMETIDAE)
- irregulare, Dendropoma irregulare L.W. Dillwyn, 1817 - syn of: Dendropoma irregulare (A.V.M.D. D'Orbigny, 1841) - (VERMETIDAE)
- irregulare, Vidrioceras irregulare Böse, 1919 † - (VIDRIOCERATIDAE) (FOSSIL)
- irregularis, Tornatellides irregularis C.M. Cooke & H.A. Pilsbry, 1915 - (ACHATINELLIDAE)
- irregularis, Achatinella irregularis L. Pfeiffer - syn of: Leptachatina fusca (W. Newcomb, 1853) - (ACHATINELLIDAE)
- irregularis, Leptachatina irregularis L. Pfeiffer, 1856 - (AMASTRIDAE)
- irregularis, Floripatella irregularis (W.J. Raymond, 1905 †) - (ARCHINACELLIDAE) (FOSSIL)
- irregularis, Xenophorarca irregularis (I. Hayami & T. Kase, 1993) - (ARCIDAE)
- irregularis, Arca irregularis G.P. Deshayes, 1858 † - (ARCIDAE) (FOSSIL)
- irregularis, Barbatia irregularis (G.P. Deshayes, 1829 †) - (ARCIDAE) (FOSSIL)
- irregularis, Calloarca irregularis W.H. Dall, 1898 † - (ARCIDAE) (FOSSIL)
- irregularis, Fulcrella irregularis (G.P. Deshayes, 1857 †) - (BASTEROTIIDAE) (FOSSIL)
- irregularis, Belemnites irregularis von Schlotheim, 1813 † - syn of: Dactyloteuthis irregularis (von Schlotheim, 1813 †) - (BELEMNITELLIDAE) (FOSSIL)
- irregularis, Bellerophon irregularis Wang, 1980 † - (BELLEROPHONTIDAE) (FOSSIL)
- irregularis, Bulimulus irregularis (L. Pfeiffer, 1847) - (BULIMULIDAE)
- irregularis, Bursa awatii irregularis T. Cossignani, 1994 - (BURSIDAE)
- irregularis, Crucibulum deformis irregularis G.F. Dollfus & P. Dautzenberg, 1886 - (CALYPTRAEIDAE)
- irregularis, Paleosulcachites irregularis Q. Yi, 1977 † - (CAMBROSCLERITIDA (UNASSIGNED)) (FOSSIL)
- irregularis, Capulus irregularis E.A. Smith, 1895 - (CAPULIDAE)
- irregularis, Cardiolinka irregularis (Barrande, 1881 †) - (CARDIOLIDAE) (FOSSIL)
- irregularis, Goossensia irregularis (G.P. Deshayes, 1858 †) - (CARDITIDAE) (FOSSIL)
- irregularis, Cardita irregularis S. Clessin, 1888 - syn of: Beguina semiorbiculata (C. Linnaeus, 1758) - (CARDITIDAE)
- irregularis, Beguina irregularis S. Clessin, 1888 - syn of: Beguina semiorbiculata (C. Linnaeus, 1758) - (CARDITIDAE)
- irregularis, Ceratites irregularis (Münster, 1841 †) - (CERATITIDAE) (FOSSIL)
- irregularis, Cavellia irregularis (H.H. Suter, 1890) - (CHAROPIDAE)
- irregularis, Agathylla sulcosa irregularis (E.A. Rossmässler, 1835) - (CLAUSILIIDAE)
- irregularis, Cochlostoma elegans irregularis (A.J. Wagner, 1897) - (COCHLOSTOMATIDAE)
- irregularis, Africonus irregularis (G.B. II Sowerby, 1858) - (CONIDAE)
- irregularis, Crioceratites irregularis Dimitrova, 1967 † - (CRIOCERATITIDAE) (FOSSIL)
- irregularis, Cyclochlamys irregularis H.H. Dijkstra & B.A. Marshall, 2008 - (CYCLOCHLAMYDIDAE)
- irregularis, Cyclotus irregularis L. Pfeiffer, 1855 - syn of: Incidostoma irregulare (L. Pfeiffer, 1855) - (CYCLOPHORIDAE)
- irregularis, Naticopsis irregularis J. Perner, 1903 † - (DELPHINULOPSIDAE) (FOSSIL)
- irregularis, Indoennea irregularis (O.F. von Möllendorff, 1900) - (DIAPHERIDAE)
- irregularis, Hungerfordia irregularis M. Yamazaki & Ueshima, 2015 - (DIPLOMMATINIDAE)
- irregularis, Diplommatina irregularis O.F. von Möllendorff, 1887 - (DIPLOMMATINIDAE)
- irregularis, Ophicardelus irregularis A. Mousson, 1869 - syn of: Pleuroloba quoyi (H. Adams & A. Adams, 1854) - (ELLOBIIDAE)
- irregularis, Aaadonta irregularis (C.G. Semper, 1874) - (ENDODONTIDAE)
- irregularis, Fusinus irregularis (A.W. Grabau, 1904) - (FASCIOLARIIDAE)
- irregularis, Fusus irregularis A.W. Grabau, 1904 - syn of: Fusinus irregularis (A.W. Grabau, 1904) - (FASCIOLARIIDAE)
- irregularis, Leptostega irregularis D. Geyer, 1986 † - (HELCIONELLIDAE) (FOSSIL)
- irregularis, Eremina irregularis (A.E.J. Férussac, 1821) - (HELICIDAE)
- irregularis, Hiatella irregularis Š. Brusina, 1866 - syn of: Hiatella arctica (C. Linnaeus, 1767) - (HIATELLIDAE)
- irregularis, Lapparentia irregularis (G.P. Deshayes, 1862 †) - (HYDROBIIDAE) (FOSSIL)
- irregularis, Kolymia irregularis Licharew, 1941 † - (KOLYMIIDAE) (FOSSIL)
- irregularis, Erycina irregularis Recluz, 1844 † - (LASAEIDAE) (FOSSIL)
- irregularis, Ercolania irregularis (C.N.E. Eliot, 1904) - (LIMAPONTIIDAE)
- irregularis, Malvufundus irregularis F.P. Jousseaume, 1894 - syn of: Malleus legumen L.A. Reeve, 1858 - (MALLEIDAE)
- irregularis, Dactyloteuthis irregularis (von Schlotheim, 1813 †) - (MEGATEUTHIDIDAE) (FOSSIL)
- irregularis, Melanopsis irregularis Handmann, 1882 † - (MELANOPSIDAE) (FOSSIL)
- irregularis, Melanopsis jordanica irregularis A. Mousson, 1861 - (MELANOPSIDAE)
- irregularis, Chicoreus irregularis R. Tate, 1888 † - syn of: Xenotrophon basedowi (A.E.M. Cossmann, 1903 †) - (MURICIDAE) (FOSSIL)
- irregularis, Vaugonia niranohamensis irregularis Kobayashi & A. Mori, 1955 † - (MYOPHORELLIDAE) (FOSSIL)
- irregularis, Nassarius irregularis É.A.A. Locard, 1892 - syn of: Nassarius gibbosulus (C. Linnaeus, 1758) - (NASSARIIDAE)
- irregularis, Nucula irregularis G.B. III Sowerby, 1904 - (NUCULIDAE)
- irregularis, Knightella irregularis Longstaff, 1933 † - (ORTHONEMIDAE) (FOSSIL)
- irregularis, Palaeacmaea irregularis W.J. Raymond, 1905 † - syn of: Floripatella irregularis (W.J. Raymond, 1905 †) - (PALAEACMAEIDAE) (FOSSIL)
- irregularis, Palaeomutela irregularis Amalitsky, 1892 † - (PALAEOMUTELIDAE) (FOSSIL)
- irregularis, Palaeostylus irregularis A. Nützel & Nakazawa, 2012 † - (PALAEOSTYLIDAE) (FOSSIL)
- irregularis, Parahoplites irregularis Casey † - (PARAHOPLITIDAE) (FOSSIL)
- irregularis, Peeten irregularis Bose, 1925 † - syn of: Neithea occidentalis (T.A. Conrad, 1855 †) - (PECTINIDAE) (FOSSIL)
- irregularis, Pecten irregularis G.P. Deshayes, 1832 - syn of: Talochlamys pusio (C. Linnaeus, 1758) - (PECTINIDAE)
- irregularis, Chlamys irregularis G.B. Sowerby, 1842 - syn of: Laevichlamys cuneata (L.A. Reeve, 1853) - (PECTINIDAE)
- irregularis, Procerites irregularis Imlay, 1953 † - (PERISPHINCTIDAE) (FOSSIL)
- irregularis, Plicatula irregularis R.W. Dunker, 1882 - syn of: Plicatula horrida R.W. Dunker, 1882 - (PLICATULIDAE)
- irregularis, Syrnola irregularis A. Peñas & E. Rolán, 2016 - (PYRAMIDELLIDAE)
- irregularis, Pusillina lineolata irregularis F. Nordsieck, 1972 - (RISSOIDAE)
- irregularis, Parasilesites irregularis Imlay, 1960 † - (SILESITIDAE) (FOSSIL)
- irregularis, Palaeosulcachites irregularis Z.X. Qian, 1977 † - syn of: Siphogonuchites triangularis Z.X. Qian, 1977 † - (SIPHOGONUCHITIDAE) (FOSSIL)
- irregularis, Siphonaria irregularis Sacco, 1897 † - (SIPHONARIIDAE) (FOSSIL)
- irregularis, Tagelus irregularis A.A. Olsson, 1961 - (SOLECURTIDAE)
- irregularis, Sonninia irregularis Buckman † - (SONNINIIDAE) (FOSSIL)
- irregularis, Pseudosubulina irregularis H.A. Pilsbry, 1907 - (SPIRAXIDAE)
- irregularis, Eosteinmannites irregularis (Welter, 1914 †) - (STEINMANNITIDAE) (FOSSIL)
- irregularis, Oostrombus irregularis A. Fuchs, 1870 † - syn of: Oostrombus auriculatus (J.P.S. Grateloup, 1834 †) - (STROMBIDAE) (FOSSIL)
- irregularis, Terebra irregularis K.H.J. Thiele, 1925 - (TEREBRIDAE)
- irregularis, Terquemia irregularis (Etallon 1863) † - (TERQUEMIIDAE) (FOSSIL)
- irregularis, Discopsis irregularis E. Rolán & F. Rubio, 2002 - (TORNIDAE)
- irregularis, Trochus irregularis W.E. Leach, 1852 - syn of: Calliostoma zizyphinum (C. Linnaeus, 1758) - (TROCHIDAE)
- irregularis, Anodon irregularis P.M. Heude, 1879 - syn of: Sinanodonta woodiana (I. Lea, 1834) - (UNIONIDAE)
- irregularis, Spartocentrum irregularis (W.M. Gabb, 1868) - (UROCOPTIDAE)
- irregularis, Grateloupia irregularis (B. de Basterot, 1825 †) - (VENERIDAE) (FOSSIL)
- irregularis, Venus irregularis L.A. Reeve, 1864 - syn of: Venus declivis G.B. II Sowerby, 1853 - (VENERIDAE)
- irregularis, Spiroglyphus irregularis D'Orbigny, 1841 - syn of: Dendropoma irregulare (A.V.M.D. D'Orbigny, 1841) - (VERMETIDAE)
- irregularis, Vertigo irregularis C. Pollonera, 1885 - syn of: Vertigo antivertigo J.P.R. Draparnaud, 1801 - (VERTIGINIDAE)
- irregularis, Alcithoe irregularis J. Marwick, 1926 † - (VOLUTIDAE) (FOSSIL)
- irregularis, Schwartziella irregularis E. Rolán & L. Luque, 2000 - (ZEBINIDAE)
- irregularis clavigeroi, Spartocentrum irregularis clavigeroi (G.D. Hanna, 1923) - (UROCOPTIDAE)
- irregularis negligens, Pseudosubulina irregularis negligens (H.B. Baker, 1939) - (SPIRAXIDAE)
- irregularis pittieri, Aperostoma irregularis pittieri E.C. Von Martens, 1900 - syn of: Incidostoma pittieri (E.C. Von Martens, 1900) - (NEOCYCLOTIDAE)
- irremotis, Leptopecten irremotis (A.A. Olsson & A. Harbison, 1953 †) - (PECTINIDAE) (FOSSIL)
- irretita, Clathurella irretita C. Hedley, 1899 - (CLATHURELLIDAE)
- irrevocata, Syrnola irrevocata C.R. Laws, 1937 † - (PYRAMIDELLIDAE) (FOSSIL)
- irrigua, Leiostyla irrigua R.T. Lowe, 1852 - (LAURIIDAE)
- irrigua, Semisulcospira irrigua (E.C. Von Martens, 1877) - (SEMISULCOSPIRIDAE)
- irrigua, Streptostyla irrigua (R.J. Shuttleworth, 1852) - (SPIRAXIDAE)
- irrigua cingulata, Streptostyla irrigua cingulata J.C.H. Crosse & P.H. Fischer, 1869 - (SPIRAXIDAE)
- irrigua quirozi, Streptostyla irrigua quirozi H. Strebel, 1877 - (SPIRAXIDAE)
- irrigua similis, Streptostyla irrigua similis H. Strebel, 1877 - (SPIRAXIDAE)
- irrigua ventricosa, Streptostyla irrigua ventricosa E.C. Von Martens, 1891 - (SPIRAXIDAE)
- irritans, Tricolia irritans K.H.J. Thiele, 1930 - syn of: Tricolia tomlini (J.H. Gatliff & C.J. Gabriel, 1921) - (PHASIANELLIDAE)
- irritata, Omphaloptycha irritata E.A.L. Kittl, 1894 † - (COELOSTYLINIDAE) (FOSSIL)
- irritilasi, Eutrephoceras irritilasi Ifrim & al., 2013 † - (NAUTILIDAE) (FOSSIL)
- irrorata, Clypeomorus irrorata (A.A. Gould, 1849) - (CERITHIIDAE)
- irrorata, Columbella irrorata L.A. Reeve, 1859 - syn of: Rhombinella laevigata (C. Linnaeus, 1758) - (COLUMBELLIDAE)
- irrorata, Naria irrorata (J.E. Gray, 1828) - (CYPRAEIDAE)
- irrorata, Cypraea irrorata J.E. Gray, 1828 - syn of: Naria irrorata (J.E. Gray, 1828) - (CYPRAEIDAE)
- irrorata, Erosaria irrorata (J.E. Gray, 1828) - syn of: Naria irrorata (J.E. Gray, 1828) - (CYPRAEIDAE)
- irrorata, Fissurella irrorata L.S.R. Bergh, 1878 - syn of: Variegemarginula punctata (A. Adams, 1852) - (FISSURELLIDAE)
- irrorata, Littoraria irrorata (T. Say, 1822) - (LITTORINIDAE)
- irrorata, Marginella irrorata K.T. Menke, 1828 - (MARGINELLIDAE)
- irrorata, Ilyanassa irrorata (T.A. Conrad, 1863 †) - (NASSARIIDAE) (FOSSIL)
- irrorata, Peronia irrorata A.A. Gould, 1852 - syn of: Onchidella nigricans (J.R.C. Quoy & J.P. Gaimard, 1832) - (ONCHIDIIDAE)
- irrorata, Onchidella irrorata A.A. Gould, 1852 - syn of: Onchidella nigricans (J.R.C. Quoy & J.P. Gaimard, 1832) - (ONCHIDIIDAE)
- irrorata, Porphyrobaphe irrorata (L.A. Reeve, 1849) - (ORTHALICIDAE)
- irrorata, Ferrissia irrorata (L. Guilding, 1828) - (PLANORBIDAE)
- irrorata, Adamsiella irrorata C.P. Gloyne, 1875 - (POMATIIDAE)
- irrorata, Tritonia irrorata (L.S.R. Bergh, 1905) - (TRITONIIDAE)
- irrorata, Turritella irrorata T.A. Conrad, 1855 † - (TURRITELLIDAE) (FOSSIL)
- irrorata, Cyprogenia irrorata I. Lea, 1828 - syn of: Cyprogenia stegaria (C.S. Rafinesque, 1820) - (UNIONIDAE)
- irrorata elongata, Porphyrobaphe irrorata elongata (K. Miller, 1859) - (ORTHALICIDAE)
- irrorata pusilla, Cyprogenia irrorata pusilla C.T. Simpson, 1900 - syn of: Cyprogenia stegaria (C.S. Rafinesque, 1820) - (UNIONIDAE)
- irroratus, Littoraria irroratus T. Say, 1822 - syn of: Littoraria irrorata (T. Say, 1822) - (LITTORINIDAE)
- irroratus, Turbo irroratus T. Say, 1822 - syn of: Littoraria irrorata (T. Say, 1822) - (TURBINIDAE)
- irroratus, Unio irroratus I. Lea, 1828 - syn of: Cyprogenia stegaria (C.S. Rafinesque, 1820) - (UNIONIDAE)
- irroratus, Tomelasmus irroratus (J. Gundlach, 1856) - (UROCOPTIDAE)
- irroratus abraensis, Tomelasmus irroratus abraensis C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- irroratus caimitensis, Tomelasmus irroratus caimitensis C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- irroratus infernalis, Tomelasmus irroratus infernalis C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- irroratus maceoi, Tomelasmus irroratus maceoi C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- irroratus saccharinus, Tomelasmus irroratus saccharinus C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- irroratus similimus, Tomelasmus irroratus similimus C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- irroratus sparsus, Tomelasmus irroratus sparsus C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- irroratus tacoensis, Tomelasmus irroratus tacoensis C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- irrugata, Pseudozygopleura irrugata Hoare & Sturgeon, 1985 † - (PSEUDOZYGOPLEURIDAE) (FOSSIL)
- irtyschensis, Casertiana irtyschensis L.V. Krivosheina, 1976 - syn of: Pisidium casertanum (Poli, 1791) - (SPHAERIIDAE)
- irtyshensis, Goniatites irtyshensis Librovitch, 1940 † - (GONIATITIDAE) (FOSSIL)
- irubensis, Alzoniella perrisii irubensis H.D. Boeters, 2000 - (HYDROBIIDAE)
- irudina, Barbatia irudina J.B.P.A. Lamarck, 1819 - syn of: Acar squamosa (J.B.P.A. Lamarck, 1819) - (ARCIDAE)
- iruense, Protocyclendoceras iruense I. Balashov, 1968 † - syn of: Anthoceras vaginatum (Schlotheim, 1820 †) - (ENDOCERIDA (unassigned)) (FOSSIL)
- iruritai, Corrosella iruritai (D. Delicado, Machordom & M.A. Ramos, 2012) - (HYDROBIIDAE)
- irus, Donax irus C. Linnaeus, 1758 - syn of: Irus irus (C. Linnaeus, 1758) - (DONACIDAE)
- Irus, syn of: Genus Spirorbula R.T. Lowe, 1852 (HYGROMIIDAE)
- irus, Nassarius irus (E.C. Von Martens, 1880) - (NASSARIIDAE)
- irus, Heteromacoma irus (S.C.T. Hanley, 1845) - (TELLINIDAE)
- irus, Tellina irus S.C.T. Hanley, 1845 - syn of: Heteromacoma irus (S.C.T. Hanley, 1845) - (TELLINIDAE)
- irus, Tellina irus Auct. non S.C.T. Hanley, 1845 - syn of: Macoma inquinata G.P. Deshayes, 1855 - (TELLINIDAE)
- Irus, Genus Irus A. Schmidt, 1818 (VENERIDAE)
- irus, Irus irus (C. Linnaeus, 1758) - (VENERIDAE)
- irus, Venerupis irus M. Yokoyama, 1920 - syn of: Irus ishibashianus J.T. Kuroda & T. Habe, 1952 - (VENERIDAE)
- irus barrensis, Venerupis irus barrensis A. De Gregorio, 1889 - syn of: Irus irus (C. Linnaeus, 1758) - (VENERIDAE)
- irus bicolor, Venerupis irus bicolor M.E.J. Bucquoy, P. Dautzenberg & G.F. Dollfus, 1893 - syn of: Irus irus (C. Linnaeus, 1758) - (VENERIDAE)
- irus crebrilamellata, Venerupis irus crebrilamellata M.E.J. Bucquoy, P. Dautzenberg & G.F. Dollfus, 1893 - syn of: Irus irus (C. Linnaeus, 1758) - (VENERIDAE)
- irus flava, Venerupis irus flava M.E.J. Bucquoy, P. Dautzenberg & G.F. Dollfus, 1893 - syn of: Irus irus (C. Linnaeus, 1758) - (VENERIDAE)
- irus geographica, Venerupis irus geographica T.A. de M. Monterosato, 1917 - syn of: Irus irus (C. Linnaeus, 1758) - (VENERIDAE)
- irus rosea, Venerupis irus rosea M.E.J. Bucquoy, P. Dautzenberg & G.F. Dollfus, 1893 - syn of: Irus irus (C. Linnaeus, 1758) - (VENERIDAE)
- irus tricolor, Venerupis irus tricolor M.E.J. Bucquoy, P. Dautzenberg & G.F. Dollfus, 1893 - syn of: Irus irus (C. Linnaeus, 1758) - (VENERIDAE)
- Irusella, Subgenus Irus (Irusella) L.G. Hertlein & U.S. Grant, 1972 (VENERIDAE)
- irusianus, Venerupis irusianus É.A.A. Locard, 1892 - syn of: Irus irus (C. Linnaeus, 1758) - (VENERIDAE)
- IrusSchmidt, syn of: Genus Irus A. Schmidt, 1818 (VENERIDAE)
- iruyensis, Ctenodonta iruyensis (Harrington 1938) † - (CTENODONTIDAE) (FOSSIL)
- irvajamensis, Pitar irvajamensis Devjatilova, 1981 † - (VENERIDAE) (FOSSIL)
- irvinae, Charopa irvinae C.M.D.E. Legrand, 1871 - syn of: Stenacapha hamiltoni (J.C. Cox, 1868) - (CHAROPIDAE)
- irvinae, Bistolida irvinae J.C. Cox, 1889 - syn of: Bistolida stolida (C. Linnaeus, 1758) - (CYPRAEIDAE)
- irvinae, Helix irvinae C.M.D.E. Legrand, 1871 - syn of: Stenacapha hamiltoni (J.C. Cox, 1868) - (HELICIDAE)
- irvinae, Ancylastrum irvinae W.F. Petterd, 1888 - (PLANORBIDAE)
- irvinae, Cymbiola irvinae (E.A. Smith, 1909) - (VOLUTIDAE)
- irvineanae, Bistolida irvineanae J.C. Cox, 1890 - syn of: Bistolida brevidentata (G.B. II Sowerby, 1870) - (CYPRAEIDAE)
- irvineanus, Bothriembryon irvineanus T. Iredale, 1939 - (BOTHRIEMBRYONTIDAE)
- irvingi, Bornella irvingi M. Edmunds & R.C. Preece, 1996 - (BORNELLIDAE)
- irvingi, Mesembrisepia irvingi (O. Meyer, 1909) - (SEPIIDAE)
- irvingi, Proplina irvingi (R.P. Whitfield, 1878 †) - (TRYBLIDIIDAE) (FOSSIL)
- irwinense, Svetlanoceras irwinense (Teichert & Glenister, 1952 †) - (PARAGASTRIOCERATIDAE) (FOSSIL)
- irwinensis, Retispira irwinensis Dickins, 1963 † - (KNIGHTITIDAE) (FOSSIL)
- irwinensis, Unio irwinensis I. Lea, 1872 - syn of: Unio abbevillensis I. Lea, 1857 - (UNIONIDAE)
- irwini, Achatinella leucorraphe irwini H.A. Pilsbry & C.M. Cooke, 1914 - (ACHATINELLIDAE)
- irwiniana, Amastra irwiniana C.M. Cooke, 1908 - (AMASTRIDAE)
- isa, Noumeaella isa Er. Marcus & Ev. Marcus, 1970 - (FACELINIDAE)
- isaaci, Diodora yaroni isaaci J.M.J. Christiaens, 1987 - (FISSURELLIDAE)
- isaaclei, Prolyelliceras isaaclei Etayo Serna, 1979 † - (PROLYELLICERATIDAE) (FOSSIL)
- isaacooki, Chama isaacooki J.M. Healy, K.L. Lamprell & J. Stanisic, 1993 - (CHAMIDAE)
- isaacpetiti, Oreoterebra isaacpetiti (C.J. Maury, 1925 †) - (TEREBRIDAE) (FOSSIL)
- isaacsi, Africanella isaacsi (R. Houart, 1984) - (MURICIDAE)
- isaacsii, Pleurotomaria isaacsii J.W. Hall & R.P. Whitfield, 1873 † - (PLEUROTOMARIIDAE) (FOSSIL)
- isaacsoni, Scalina isaacsoni DeVries, 2006 † - (EPITONIIDAE) (FOSSIL)
- isaacsoni, Biformispira isaacsoni Rohr, 1980 † - (EUOMPHALIDAE) (FOSSIL)
- Isaba, syn of: Genus Mitra J.B.P.A. Lamarck, 1798 (MITRIDAE)
- isabanus, Obscurella isabanus P. Fagot, 1889 - syn of: Cochlostoma obscurum laburdense (L. de Folin & F. Bèrillon, 1877) - (COCHLOSTOMATIDAE)
- isabelae, Adamsoceras isabelae Flower, 1957 † - (ACTINOCERIDA (UNASSIGNED)) (FOSSIL)
- isabelae, Cancellaria isabelae B.M. Landau & al., 2012 † - (CANCELLARIIDAE) (FOSSIL)
- isabelae, Pleurotomoides isabelae B.M. Landau & al., 2013 † - (CLATHURELLIDAE) (FOSSIL)
- isabelae, Xerosecta isabelae J. Ahuir, 2014 - (HYGROMIIDAE)
- isabelae, Serrata isabelae (L. Bozzetti, 2005) - (MARGINELLIDAE)
- isabelae, Volvarina isabelae (P.J. Borro, 1946) - (MARGINELLIDAE)
- isabelae, Melanopsis isabelae J. Ahuir, 2016 - (MELANOPSIDAE)
- isabelae, Favartia isabelae R. Houart & J. Rosado, 2008 - (MURICIDAE)
- isabelae, Neritina isabelae B.M. Landau, F. Da Silva & S.M. Heitz, 2016 † - (NERITIDAE) (FOSSIL)
- isabelae, Rhytidopoma isabelae C.G. Aguayo & M.L. Jaume, 1953 - (POMATIIDAE)
- isabelae, Chondropoma solidulum isabelae C.G. Aguayo, 1943 - (POMATIIDAE)
- isabelae, Fulgoraria isabelae I.P. Bondarev & P. Bail, 1999 - syn of: Saotomea pratasensis T.C. Lan, 1997 - (VOLUTIDAE)
- isabelae, Amoria molleri isabelae P. Bail & A. Limpus, 2001 - (VOLUTIDAE)
- isabelanus, Cyclophorus woodianus isabelanus P. Bartsch, 1939 - (CYCLOPHORIDAE)
- isabelarum, Africonus isabelarum (M.J. Tenorio & C.M.L. Afonso, 2004) - (CONIDAE)
- isabelensis, Ambercyclus isabelensis Ferrari & al., 2014 † - (EUCYCLIDAE) (FOSSIL)
- isabelita, Bathytoma isabelita Unknown Author - (BORSONIIDAE)
- isabelita, Turbonilla isabelita A. Peñas & E. Rolán, 2010 - (PYRAMIDELLIDAE)
- isabelitae, Turbonilla isabelitae A. Peñas & E. Rolán, 2000 - (PYRAMIDELLIDAE)
- isabella, Polydontes isabella (A.E.J. Férussac, 1821) - (CAMAENIDAE)
- isabella, Vexillum isabella W.J. Swainson, 1831 - syn of: Cancilla isabella (W.J. Swainson, 1831) - (COSTELLARIIDAE)
- isabella, Talabrica isabella F.W. Hutton, 1873 - syn of: Talabrica bellula (A. Adams, 1854) - (CRASSATELLIDAE)
- isabella, Luria isabella (C. Linnaeus, 1758) - (CYPRAEIDAE)
- isabella, Helix isabella A.E.J. Férussac, 1822 - (HELICIDAE)
- isabella, Helminthoglypta isabella S.S. Berry, 1938 - (HELMINTHOGLYPTIDAE)
- isabella, Cancilla isabella (W.J. Swainson, 1831) - (MITRIDAE)
- isabella, Flexopecten isabella J.B.P.A. Lamarck, 1819 - syn of: Flexopecten flexuosus (G.S. Poli, 1795) - (PECTINIDAE)
- isabella, Pleurodonte isabella (A.E.J. Férussac, 1821) - (PLEURODONTIDAE)
- isabella, Inquisitor isabella R.N. Kilburn, 1988 - (PSEUDOMELATOMIDAE)
- isabella, Odostomella isabella P. Lozouet, 1998 † - (PYRAMIDELLIDAE) (FOSSIL)
- isabella, Miniseraphs isabella (G.P. Deshayes, 1865 † †) - (SERAPHSIDAE) (FOSSIL)
- isabella, Laevistrombus turturella isabella (J.B.P.A. Lamarck, 1810) - (STROMBIDAE)
- isabella, Strioterebrum isabella (K.H.J. Thiele, 1925) - (TEREBRIDAE)
- isabella, Tomelasmus hesperius isabella C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- isabella, Gouldia isabella F.W. Hutton, 1873 - syn of: Talabrica bellula (A. Adams, 1854) - (VENERIDAE)
- isabella controversa, Luria isabella controversa J.E. Gray, 1824 - syn of: Luria controversa (J.E. Gray, 1824) - (CYPRAEIDAE)
- isabella lekalekana, Luria isabella lekalekana H.S. Ladd, 1934 - syn of: Luria gilvella F.Jr. Lorenz, 2002 - (CYPRAEIDAE)
- isabella limpida, Cypraea isabella limpida J.C. Melvill, 1888 - syn of: Luria isabella (C. Linnaeus, 1758) - (CYPRAEIDAE)
- isabella morchii, Cancilla isabella morchii A. Adams, 1855 - (MITRIDAE)
- isabella rumphii, Luria isabella rumphii F.A. Schilder & M. Schilder, 1938 - (CYPRAEIDAE)
- isabella taiwanica, Cancilla isabella taiwanica T. Shikama & C.S. Chiang, 1977 - (MITRIDAE)
- isabellae, Crepidula isabellae Is. Taki, 1938 - (CALYPTRAEIDAE)
- isabellae, Cerithium isabellae C.J. Maury, 1912 † - (CERITHIIDAE) (FOSSIL)
- isabellae, Chaetopleura isabellae D'Orbigny, 1841 - syn of: Chaetopleura isabellei (A.V.M.D. D'Orbigny, 1841) - (CHAETOPLEURIDAE)
- isabellae, Solatopupa isabellae E. Caziot, 1913 - syn of: Solatopupa similis (J.G. Bruguière, 1792) - (CHONDRINIDAE)
- isabellae, Columbites isabellae Guex & al., 2005 † - (COLUMBITIDAE) (FOSSIL)
- isabellae, Tucetona isabellae P.H. Valentich-Scott & E.A.R. Garfinkle, 2011 - (GLYCYMERIDIDAE)
- isabellae, Mangelia isabellae C.J. Maury, 1910 † - (MANGELIIDAE) (FOSSIL)
- isabellae, Chlamys isabellae W. Macgillivray, 1843 - syn of: Talochlamys pusio (C. Linnaeus, 1758) - (PECTINIDAE)
- isabellae, Choffatia isabellae Bonnot, Boursicot, Ferchaud & Marchand, 2008 † - (PERISPHINCTIDAE) (FOSSIL)
- isabellae, Enaeta isabellae C.J. Maury, 1910 † - (VOLUTIDAE) (FOSSIL)
- isabellae modesta, Enaeta isabellae modesta D.T. Dockery, 1984 † - (VOLUTIDAE) (FOSSIL)
- isabellaensis, Lesueurilla isabellaensis Cullison, 1944 † - syn of: Bridgeites planidorsalis (Cullison, 1944 †) - (LESUEURILLIDAE) (FOSSIL)
- isabellaensis, Bridgeites isabellaensis Cullison, 1944 † - syn of: Bridgeites planidorsalis (Cullison, 1944 †) - (RAPHISTOMATIDAE) (FOSSIL)
- isabellamexicana, Luria isabellamexicana (R.E.C. Stearns, 1893) - (CYPRAEIDAE)
- isabellaneum, Pisidium isabellaneum H.B. Herrington, 1954 - syn of: Pisidium casertanum (Poli, 1791) - (SPHAERIIDAE)
- isabellaprimitiva, Luria isabellaprimitiva B.M. Landau & Groves, 2011 † - (CYPRAEIDAE) (FOSSIL)
- Isabellaria, Genus Isabellaria W. von Vest, 1867 (CLAUSILIIDAE)
- isabelleana, Heleobia isabelleana D'Orbigny - (COCHLIOPIDAE)
- isabelleana, Littoridina isabelleana D'Orbigny - syn of: Heleobia isabelleana D'Orbigny - (COCHLIOPIDAE)
- isabelleana, Mactra isabelleana D'Orbigny, 1846 - (MACTRIDAE)
- isabelleana, Notocochlis isabelleana (A.V.M.D. D'Orbigny, 1840) - (NATICIDAE)
- isabelleana, Natica isabelleana D'Orbigny, 1840 - syn of: Notocochlis isabelleana (A.V.M.D. D'Orbigny, 1840) - (NATICIDAE)
- isabelleana, Venus isabelleana D'Orbigny, 1846 - syn of: Tivela dentaria isabelleana (A.V.M.D. D'Orbigny, 1846) - (VENERIDAE)
- isabelleana, Tivela dentaria isabelleana (A.V.M.D. D'Orbigny, 1846) - (VENERIDAE)
- isabellei, Chaetopleura isabellei (A.V.M.D. D'Orbigny, 1841) - (CHAETOPLEURIDAE)
- isabellei, Chiton isabellei D'Orbigny, 1841 - syn of: Chaetopleura isabellei (A.V.M.D. D'Orbigny, 1841) - (CHITONIDAE)
- isabellei, Anachis isabellei (A.V.M.D. D'Orbigny, 1839) - (COLUMBELLIDAE)
- isabellei, Parvanachis isabellei D'Orbigny, 1839 - syn of: Anachis isabellei (A.V.M.D. D'Orbigny, 1839) - (COLUMBELLIDAE)
- isabellei, Pyrene isabellei D'Orbigny, 1839 - syn of: Anachis isabellei (A.V.M.D. D'Orbigny, 1839) - (COLUMBELLIDAE)
- isabellei, Nassa isabellei L.A. Reeve, 1853 - syn of: Nassarius gemmuliferus (A. Adams, 1852) - (NASSARIIDAE)
- isabellensis, Geotrochus isabellensis (S.M. Souverbie, 1863) - (HELICARIONIDAE)
- isabellensis, Helix isabellensis S.M. Souverbie, 1863 - syn of: Geotrochus isabellensis (S.M. Souverbie, 1863) - (HELICIDAE)
- isabellensis, Leopecten isabellensis T.R. Waller, 2007 - (PECTINIDAE)
- isabellina, Euplecta isabellina (L. Pfeiffer, 1854) - (ARIOPHANTIDAE)
- isabellina, Isabellaria isabellina (L. Pfeiffer, 1842) - (CLAUSILIIDAE)
- isabellina, Columbella isabellina J.C.H. Crosse, 1865 - (COLUMBELLIDAE)
- isabellina, Oliva flammulata isabellina P. Dautzenberg, 1910 - (OLIVIDAE)
- isabellina, Parachondria isabellina G.T. Watters, 2016 - (POMATIIDAE)
- isabellina, Chondropomorus isabellina G.T. Watters, 2016 - syn of: Parachondria isabellina G.T. Watters, 2016 - (POMATIIDAE)
- isabellina, Placamen isabellina (R.A. Philippi, 1849) - (VENERIDAE)
- isabellina osculans, Isabellaria isabellina osculans (E.C. Von Martens, 1876) - (CLAUSILIIDAE)
- isabellina thebana, Isabellaria isabellina thebana (E.C. Von Martens, 1876) - (CLAUSILIIDAE)
- isabellinus, Orthalicus isabellinus E.C. Von Martens, 1873 - syn of: Orthalicus bensoni L.A. Reeve, 1849 - (ORTHALICIDAE)
- isabelloides, Luria isabelloides F.A. Schilder, 1924 - syn of: Luria isabella (C. Linnaeus, 1758) - (CYPRAEIDAE)
- isabenense, Potamides isabenense Dominici & T. Kowalke, 2014 † - (POTAMIDIDAE) (FOSSIL)
- isabillnia, Venus isabillnia R.A. Philippi, 1849 - syn of: Placamen isabellina (R.A. Philippi, 1849) - (VENERIDAE)
- isacsonni, Biformispira isacsonni Rohr, 1980 † - (EUOMPHALIDAE) (FOSSIL)
- isae, Turbonilla isae A. Peñas & E. Rolán, 2010 - (PYRAMIDELLIDAE)
- Isaea, syn of: Genus Dyris T.A. Conrad, 1871 (COCHLIOPIDAE)
- isamberti, Zuluiceras isamberti van Hoepen, 1965 † - syn of: Delawarella vanuxemi (Morton, 1830 †) - (COLLIGNONICERATIDAE) (FOSSIL)
- isamberti, Schloenbachia isamberti M. von Neumayr 1875 † - (SCHLOENBACHIIDAE) (FOSSIL)
- Isanda, Genus Isanda H. Adams & A. Adams, 1854 (TROCHIDAE)
- isaoi, Tosapusia isaoi (J.T. Kuroda & K. Sakurai, 1959) - (COSTELLARIIDAE)
- isaotakii, Buccinum isaotakii T. Kira, 1959 - (BUCCINIDAE)
- isaotakii, Cyclocardia isaotakii (R. Tiba, 1972) - (CARDITIDAE)
- isaotakii, Costellaria isaotakii J.T. Kuroda, 1961 - syn of: Vexillum costatum (J.F. Gmelin, 1791) - (COSTELLARIIDAE)
- isaotakii, Siphonodentalium isaotakii T. Habe, 1953 - (GADILIDAE)
- isaotakii, Placiphorella isaotakii H. Saito, K. Fujikura & E. Tsuchida, 2008 - (MOPALIIDAE)
- isaotakii, Antiplanes isaotakii (T. Habe, 1958) - (PSEUDOMELATOMIDAE)
- isaotakii, Rectiplanes isaotakii T. Habe, 1958 - syn of: Antiplanes isaotakii (T. Habe, 1958) - (PSEUDOMELATOMIDAE)
- isaotakii, Parvithracia isaotakii (T.A. Okutani, 1964) - (THRACIIDAE)
- isaotakii, Euthymella isaotakii S. Kosuge, 1962 - (TRIPHORIDAE)
- Isapis, syn of: Genus Iselica W.H. Dall, 1918 (AMATHINIDAE)
- Isapsis, Subgenus Fossarus (Isapsis) Adams & Adams † (PLANAXIDAE) (FOSSIL)
- Isara, Subgenus Mitra (Isara) Adams & Adams, 1853 † (MITRIDAE) (FOSSIL)
- Isara, syn of: Genus Mitra J.B.P.A. Lamarck, 1798 (MITRIDAE)
- isarae, Marmorana serpentina isarae (M. Paulucci, 1882) - (HELICIDAE)
- Isarcha, syn of: Genus Sanguinolaria J.B.P.A. Lamarck, 1799 (PSAMMOBIIDAE)
- isarica, Urticicola isarica (É.A.A. Locard, 1882) - (HYGROMIIDAE)
- isaurae, Venericardia isaurae C.J. Maury, 1924 † - (CARDITIDAE) (FOSSIL)
- Isaurica, Genus Isaurica W. Kobelt, 1901 (HELICIDAE)
- isbergi, Striatocycloceras isbergi Kröger, 2013 † - (ORTHOCERATIDAE) (FOSSIL)
- isbergi, Bitrigonocardia isbergi (R.M. Branson, 1942 †) - (PSEUDOBIGALEAIDAE) (FOSSIL)
- Ischadium, Genus Ischadium A.J. Jukes-Browne, 1905 (MYTILIDAE)
- ischitana, Flabellina ischitana Y.M. Hirano & T.E. Thompson, 1990 - (FLABELLINIDAE)
- ischna, Maoritomella ischna (R.B. Watson, 1881) - (BORSONIIDAE)
- ischna, Tomopleura ischna R.B. Watson, 1881 - syn of: Maoritomella ischna (R.B. Watson, 1881) - (BORSONIIDAE)
- ischna, Mitrella ischna Gardner, 1937 † - (COLUMBELLIDAE) (FOSSIL)
- ischna, Ithycythara ischna W.P. Woodring, 1928 † - (MANGELIIDAE) (FOSSIL)
- ischna, Mangelia ischna W.H. Dall, 1927 - syn of: Famelica monoceros (R.B. Watson, 1881) - (MANGELIIDAE)
- ischna, Serrata vadosa ischna J. Gardner, 1937 † - (MARGINELLIDAE) (FOSSIL)
- ischna, Varicellaria griffithii ischna H.A. Pilsbry, 1907 - (OLEACINIDAE)
- ischna, Famelica ischna W.H. Dall, 1927 - syn of: Famelica monoceros (R.B. Watson, 1881) - (RAPHITOMIDAE)
- ischna, Rissoa ischna R. Tate, 1899 - syn of: Epigrus cylindraceus (J.E. Tenison-Woods, 1878) - (RISSOIDAE)
- ischna, Subulona ischna (H.A. Pilsbry, 1919) - (SUBULINIDAE)
- ischna, Strioterebrum ischna W.P. Woodring, 1928 † - (TEREBRIDAE) (FOSSIL)
- ischna, Pleurotoma ischna R.B. Watson, 1881 - syn of: Maoritomella ischna (R.B. Watson, 1881) - (TURRIDAE)
- ischna, Tetrentodon ischna (H.A. Pilsbry, 1903) - (UROCOPTIDAE)
- ischna, Gongylostoma ischna H.A. Pilsbry, 1903 - syn of: Tetrentodon ischna (H.A. Pilsbry, 1903) - (UROCOPTIDAE)
- ischna mitrodita, Mitrella ischna mitrodita Gardner, 1937 † - (COLUMBELLIDAE) (FOSSIL)
- ischna?, Strombiformis ischna? Gardner, 1947 † - (EULIMIDAE) (FOSSIL)
- ischnatracta, Volvulella ischnatracta H.A. Pilsbry, 1930 - syn of: Volvulella persimilis (O.A.L. Mörch, 1875) - (RHIZORIDAE)
- ischnia, Monacha ischnia J.F. Mabille, 1880 - syn of: Eutheba cantiana (G. Montagu, 1803) - (HYGROMIIDAE)
- Ischnocerithium, Subgenus Cerithium (Ischnocerithium) K.H.J. Thiele, 1929 † (CERITHIIDAE) (FOSSIL)
- Ischnochiton, Genus Ischnochiton J.E. Gray, 1847 (ISCHNOCHITONIDAE)
- ISCHNOCHITONIDAE Dall, 1889 - Family (POLYPLACOPHORA-NEOLORICATA [Subclass]-CHITONIDA [Order]-CHITONINA [Suborder]-CHITONOIDEA [Superfamily])
- Ischnocion, Subgenus Obeliscus (Ischnocion) H.A. Pilsbry, 1907 (SUBULINIDAE)
- Ischnoglessula, Subgenus Pseudoglessula (Ischnoglessula) H.A. Pilsbry, 1919 (SUBULINIDAE)
- ischnon, Glyphostoma ischnon J. Gardner, 1937 † - (CLATHURELLIDAE) (FOSSIL)
- ischnon, Pecten ischnon H.A. Pilsbry & Johnson, 1917 † - syn of: Leptopecten thompsoni (C.J. Maury, 1917 †) - (PECTINIDAE) (FOSSIL)
- Ischnoplax, Genus Ischnoplax W.H. Dall, 1879 (CALLISTOPLACIDAE)
- Ischnoptygma, Genus Ischnoptygma Erwin, 1988 † (ISCHNOPTYGMATIDAE) (FOSSIL)
- ISCHNOPTYGMATIDAE Erwin, 1988 † - Family (GASTROPODA-CAENOGASTROPODA [Subclass]-SUBULITOIDEA [Superfamily]) (FOSSIL)
- Ischnopupoides, Subgenus Pupoides (Ischnopupoides) H.A. Pilsbry, 1926 (PUPILLIDAE)
- Ischnoradsia, Subgenus Ischnochiton (Ischnoradsia) R.J. Shuttleworth, 1853 (ISCHNOCHITONIDAE)
- ischnos, Inquisitor ischnos (R.A. Philippi, 1887 †) - (PSEUDOMELATOMIDAE) (FOSSIL)
- Ischnostele, syn of: Subgenus Streptostele (Raffraya) J.R. Bourguignat, 1883 (STREPTAXIDAE)
- ischnostele, Resupinata ischnostele (H.A. Pilsbry, 1909) - (UROCOPTIDAE)
- Ischnostrophina, Subgenus Brachypodella (Ischnostrophina) H.A. Pilsbry, 1933 (UROCOPTIDAE)
- ischnus, Peronaeus ischnus (H.A. Pilsbry, 1902) - (BULIMULIDAE)
- ischnus, Epigrus ischnus R. Tate, 1899 - syn of: Epigrus cylindraceus (J.E. Tenison-Woods, 1878) - (EPIGRIDAE)
- ischnus, Nassarius ischnus (J.C. Melvill, 1899) - (NASSARIIDAE)
- ischnus, Pupoides ischnus R. Tate, 1894 - (PUPILLIDAE)
- ischnus brunneofasciata, Nassarius ischnus brunneofasciata J.C. Melvill, 1899 - syn of: Nassarius ischnus (J.C. Melvill, 1899) - (NASSARIIDAE)
- Ischnusarion, syn of: Genus Ariunculus R.P. Lesson, 1881 (ARIONIDAE)
- ischurostoma, Granaria ischurostoma É.A.A. Locard, 1894 - syn of: Granaria variabilis (J.P.R. Draparnaud, 1801) - (CHONDRINIDAE)
- Ischurostoma, Genus Ischurostoma J.R. Bourguignat, 1874 (PUPINIDAE)
- Ischyrinia, Genus Ischyrinia Billings , 1866 † (ISCHYRINIIDAE) (FOSSIL)
- ISCHYRINIIDAE Kobayashi, 1933 † - Family (ROSTROCONCHIA-RIBEIRIOIDA [Order]-ISCHYRINIOIDEA [Superfamily]) (FOSSIL)
- Ischyrodonta, Genus Ischyrodonta Ulrich , 1890 † (ISCHYRODONTIDAE) (FOSSIL)
- ISCHYRODONTIDAE Scarlato & Starobogatov, 1979 † - Family (BIVALVIA-PTERIOMORPHIA [Subclass]-CYRTODONTIDA [Order]) (FOSSIL)
- isculensis, Eupachydiscus isculensis (Redtenbacher, 1873 †) - (PACHYDISCIDAE) (FOSSIL)
- Isculites, Genus Isculites Renz & Renz, 1948 † (PARAGOCERATIDAE) (FOSSIL)
- ISCULITIDAE Spath, 1951 † - Family (CEPHALOPODA-AMMONOIDEA [Subclass]-CERATITIDA [Order]-PINACOCERATOIDEA [Superfamily]) (FOSSIL)
- Isculitoides, Genus Isculitoides Spath , 1930 † (PARAGOCERATIDAE) (FOSSIL)
- iseakai, Pseudoperissolax iseakai K. Oyama & A. Mizuno, 1958 † - (MURICIDAE) (FOSSIL)
- iseborae, Turbonilla iseborae F. Lygre & C.F.C. Schander, 2010 - (PYRAMIDELLIDAE)
- isekei, Plagiothyra isekei Heidelberger & Amler, 2002 † - (PLAGIOTHYRIDAE) (FOSSIL)
- Iselica, Genus Iselica W.H. Dall, 1918 (AMATHINIDAE)
- iselini, Mastigoteuthis iselini D.J. MacDonald & W.J. Clench, 1934 - (MASTIGOTEUTHIDAE)
- Isellia, syn of: Genus Isseliella Weinkauff, 1881 (ZEBINIDAE)
- isenbergi, Carelia dolei isenbergi C.M. Cooke, 1933 - (AMASTRIDAE)
- iserense, Furloceras iserense (Oppel, 1856 †) - (PHYMATOCERATIDAE) (FOSSIL)
- iserni, Scholvienia iserni (R.A. Philippi, 1867) - (MEGASPIRIDAE)
- isfarensis, Bellerophon isfarensis Licharev & Netschajev, 1956 † - (BELLEROPHONTIDAE) (FOSSIL)
- Isfarispira, Genus Isfarispira Gubanov & al., 1995 † (OMPHALOTROCHIDAE) (FOSSIL)
- ishianum, Calliostoma ishianum M. Yokoyama, 1926 - syn of: Calliostoma multiliratum (G.B. III Sowerby, 1875) - (CALLIOSTOMATIDAE)
- ishibashianus, Irus ishibashianus J.T. Kuroda & T. Habe, 1952 - (VENERIDAE)
- ishibashii, Ovula ishibashii (J.T. Kuroda, 1928) - (OVULIDAE)
- ishibashii, Metaperrinites ishibashii W.C. Zhou & Liengjarern, 2004 † - (PERRINITIDAE) (FOSSIL)
- ishibei, Serriphaedusa ishibei A. Hunyadi & M. Szekeres, 2016 - (CLAUSILIIDAE)
- ishibei, Synprosphyma ishibei A. Hunyadi & M. Szekeres, 2016 - (CLAUSILIIDAE)
- ishibei, Telophaedusa ishibei H. Nordsieck, 2007 - (CLAUSILIIDAE)
- ishidoense, Amygdalum ishidoense (Yabe & Nagao 1926) † - (MYTILIDAE) (FOSSIL)
- ishigakensis, Plagiocardium ishigakensis F.S. MacNeil, 1964 † - (CARDIIDAE) (FOSSIL)
- ishii, Khumerspira ishii Murata, 1974 † - (BELLEROPHONTIDAE) (FOSSIL)
- ishii, Sanguinolites ishii Nakazawa, 2002 † - (SANGUINOLITIDAE) (FOSSIL)
- ishiiana, Vicaryella ishiiana (M. Yokoyama, 1926 †) - (POTAMIDIDAE) (FOSSIL)
- ishiianum, Cerithium ishiianum M. Yokoyama, 1926 † - syn of: Vicaryella ishiiana (M. Yokoyama, 1926 †) - (CERITHIIDAE) (FOSSIL)
- ishikariana, Siphonalia ishikariana K. Oyama & A. Mizuno, 1958 † - (BUCCINIDAE) (FOSSIL)
- ishikariensis, Trominina ishikariensis (I. Hayasaka & Matsui, 1951 †) - (BUCCINIDAE) (FOSSIL)
- ishikariensis, Cerithidea ishikariensis M. Yokoyama, 1932 † - (POTAMIDIDAE) (FOSSIL)
- ishikawai, Mesozaptyx ishikawai (J.T. Kuroda, 1954) - (CLAUSILIIDAE)
- ishikawai, Kitchinites ishikawai Jimbo † - (DESMOCERATIDAE) (FOSSIL)
- ishikayensis, Borisiclymenia ishikayensis W. Korn, 2002 † - (PLATYCLYMENIIDAE) (FOSSIL)
- ishimakiensis, Diplommatina kiiensis ishimakiensis J.T. Kuroda, 1960 - (DIPLOMMATINIDAE)
- Ishimoria, syn of: Genus Tomlinella J.M.R.M. Viader, 1938 (ZEBINIDAE)
- ishimotoi, Epitonium ishimotoi (H. Masahito & T. Habe, 1976) - (EPITONIIDAE)
- ishimotoi, Epitonium ishimotoi H. Masahito & T. Habe, 1976 - syn of: Epitonium ishimotoi (H. Masahito & T. Habe, 1976) - (EPITONIIDAE)
- ishiwarai, Davouxiceras ishiwarai (Yabe & Shimizu, 1926 †) - (EMERICICERATIDAE) (FOSSIL)
- ishizakii, Pseudophaedusa horikawai ishizakii (J.T. Kuroda, 1941) - (CLAUSILIIDAE)
- ishizakii, Sicradiscus ishizakii (J.T. Kuroda, 1941) - (PLECTOPYLIDAE)
- Ishnoradsia, syn of: Subgenus Ischnochiton (Ischnoradsia) R.J. Shuttleworth, 1853 (ISCHNOCHITONIDAE)
- Ishnula, Subgenus Pleurotoma (Ishnula) H.M.D. de Blainville, 1829 (TURRIDAE)
- isibasii, Prionovolva isibasii J.T. Kuroda, 1928 - syn of: Ovula ishibashii (J.T. Kuroda, 1928) - (OVULIDAE)
- isibopho, Clavus isibopho (R.N. Kilburn, 1988) - (DRILLIIDAE)
- isibopho, Tylotiella isibopho R.N. Kilburn, 1988 - syn of: Clavus isibopho (R.N. Kilburn, 1988) - (DRILLIIDAE)
- isidella, Herviera isidella J.C. Melvill & R. Standen, 1899 - (PYRAMIDELLIDAE)
- isidis, Neolobites isidis A. Greco, 1915 † - syn of: Neolobites vibrayeanus brancai Eck, 1908 † - (ENGONOCERATIDAE) (FOSSIL)
- Isidora, syn of: Genus Bulinus O.F. Müller, 1781 (PLANORBIDAE)
- Isidora, syn of: Genus Bulinus O.F. Müller, 1781 (PLANORBIDAE)
- Isidorella, Genus Isidorella R. Tate, 1896 (PLANORBIDAE)
- isidroensis, Steeriana celendinensis isidroensis W.K. Weyrauch & A. Zilch, 1954 - (CLAUSILIIDAE)
- isikawai, Clinopegma isikawai R. Tiba, 1974 - (BUCCINIDAE)
- isikela, Nuculana isikela (R.N. Kilburn, 1994) - (NUCULANIDAE)
- isilensis, Marmorana serpentina isilensis (L. Pfeiffer, 1848) - (HELICIDAE)
- isilensis, Lithodomus isilensis C.F. Parona, 1893 - syn of: Lithophaga corrugata (R.A. Philippi, 1846) - (MYTILIDAE)
- Isimerope, Genus Isimerope C. Radea & A. Parmakelis, 2013 (HYDROBIIDAE)
- isimotoi, Crepidula isimotoi Y. Otuka, 1934 † - (CALYPTRAEIDAE) (FOSSIL)
- isinbayevae, Gibberula isinbayevae J.A. Ortea, 2015 - (CYSTISCIDAE)
- isingi, Gyraulus isingi B.C. Cotton & F.C. Godfrey, 1932 - (PLANORBIDAE)
- Isiola, Genus Isiola Kríž, 1976 † (CARDIOLIDAE) (FOSSIL)
- isiola, Tenaturris isiola W.P. Woodring, 1928 † - (MANGELIIDAE) (FOSSIL)
- isipingoensis, Craspedochiton isipingoensis (E.R. Sykes, 1901) - (ACANTHOCHITONIDAE)
- isipingoensis, Onithochiton isipingoensis E.R. Sykes, 1901 - syn of: Craspedochiton isipingoensis (E.R. Sykes, 1901) - (CHITONIDAE)
- isipingoensis, Gulella isipingoensis (R. Sturany, 1898) - (STREPTAXIDAE)
- isipingoensis dextrorsa, Gulella isipingoensis dextrorsa H.C. Burnup, 1925 - syn of: Gulella dextrorsa (H.C. Burnup, 1925) - (STREPTAXIDAE)
- isipingoensis laevorsa, Gulella isipingoensis laevorsa H.C. Burnup - syn of: Gulella laevorsa (H.C. Burnup, 1925) - (STREPTAXIDAE)
- isis, Discoconcha isis (L. Pfeiffer, 1860) - (CAMAENIDAE)
- isisensis, Amphelissa isisensis R. Etheridge jr., 1921 † - (HELICOTOMIDAE) (FOSSIL)
- Isitella, syn of: Genus Parailsanella Voronova & al., 1987 † (TRENELLIDAE) (FOSSIL)
- Isitiella, syn of: Genus Parailsanella Voronova & al., 1987 † (TRENELLIDAE) (FOSSIL)
- Isititheca, Genus Isititheca Sysoev, 1968 † (SITITHECIDAE) (FOSSIL)
- islacolonis, Aphera islacolonis C.J. Maury, 1917 † - (CANCELLARIIDAE) (FOSSIL)
- islahispaniolae, Microcardium islahispaniolae (C.J. Maury, 1917 †) - (CARDIIDAE) (FOSSIL)
- islahispaniolae, Venericardia islahispaniolae C.J. Maury, 1917 † - (CARDITIDAE) (FOSSIL)
- islahispaniolae, Dominitaria islahispaniolae (C.J. Maury, 1917 †) - (COLUMBELLIDAE) (FOSSIL)
- islahispaniolae, Cardiomya islahispaniolae C.J. Maury, 1917 † - (CUSPIDARIIDAE) (FOSSIL)
- islahispaniolae, Trivia islahispaniolae C.J. Maury, 1917 † - (TRIVIIDAE) (FOSSIL)
- islalindae, Clathrodrillia islalindae (C.J. Maury, 1917 †) - (DRILLIIDAE) (FOSSIL)
- Islamia, Genus Islamia P. Radoman, 1973 (HYDROBIIDAE)
- islamioides, Sardohoratia islamioides G. Manganelli, M. Bodon & al., 1998 - (HYDROBIIDAE)
- islamogluae, Pachymelania islamogluae M. Harzhauser, Hosgör & J.M. Pacaud, 2013 † - (THIARIDAE) (FOSSIL)
- islamoides, Sardohoratia islamoides G. Manganelli, M. Bodon & al., 1998 - (HYDROBIIDAE)
- islandica, Arctica islandica (C. Linnaeus, 1767) - (ARCTICIDAE)
- islandica, Cyprina islandica C. Linnaeus, 1767 - syn of: Arctica islandica (C. Linnaeus, 1767) - (ARCTICIDAE)
- islandica, Astarte islandica G.P. Deshayes in A.V.M.D. D'Orbigny, 1849 - syn of: Astarte borealis (H.C.F. Schumacher, 1817) - (ASTARTIDAE)
- islandica, Neptunia islandica N.P. Mohr, 1786 - syn of: Colus islandicus (N.P. Mohr, 1786) - (BUCCINIDAE)
- islandica, Flabellina islandica (N.H. Odhner, 1937) - (FLABELLINIDAE)
- islandica, Lehmannia islandica L. Forcart, 1966 - (LIMACIDAE)
- islandica, Littorina islandica D.G. Reid, 1996 † - (LITTORINIDAE) (FOSSIL)
- islandica, Margarites islandica N.H. Odhner, 1910 - syn of: Solariella obscura (J.P.Y. Couthouy, 1838) - (MARGARITIDAE)
- islandica, Amauropsis islandica (J.F. Gmelin, 1791) - (NATICIDAE)
- islandica, Nerita islandica J.F. Gmelin, 1791 - syn of: Amauropsis islandica (J.F. Gmelin, 1791) - (NERITIDAE)
- islandica, Chlamys islandica (O.F. Müller, 1776) - (PECTINIDAE)
- islandica, Chrystella islandica C.F. Laseron, 1956 - (PICKWORTHIIDAE)
- islandica, Rissopsetia islandica A. Warén, 1989 - (PYRAMIDELLIDAE)
- islandica, Onoba islandica (H.B.S. Friele, 1886) - (RISSOIDAE)
- islandica, Kaitoa islandica J. Marwick, 1931 † - (SCAPHANDRIDAE) (FOSSIL)
- islandica, Sphaerium islandica J.G. Bruguière, 1797 - syn of: Batissa violacea (J.B.P.A. Lamarck, 1818) - (SPHAERIIDAE)
- islandica, Atomiscala islandica A. Warén, 1989 - (TOFANELLIDAE)
- islandica, Aclophora islandica C.F. Laseron, 1958 - (TRIPHORIDAE)
- islandica, Trochaclis islandica A. Warén, 1989 - (TROCHACLIDIDAE)
- islandica, Venus islandica O. Fabricius, 1780 - syn of: Serripes groenlandicus (N.P. Mohr, 1786) - (VENERIDAE)
- islandica albida, Chlamys islandica albida R. Arnold, 1906 - syn of: Chlamys albida (W.H. Dall in R. Arnold, 1906) - (PECTINIDAE)
- islandica crassior, Arctica islandica crassior J.G. Jeffreys, 1864 - syn of: Arctica islandica (C. Linnaeus, 1767) - (ARCTICIDAE)
- islandica erythrocomata, Chlamys islandica erythrocomata W.H. Dall, 1907 - (PECTINIDAE)
- islandica gallica, Neptunia islandica gallica É.A.A. Locard, 1896 - syn of: Colus islandicus (N.P. Mohr, 1786) - (BUCCINIDAE)
- islandica inflata, Arctica islandica inflata N.H. Odhner, 1911 - syn of: Arctica islandica (C. Linnaeus, 1767) - (ARCTICIDAE)
- islandica insculpta, Chlamys islandica insculpta A.E. Verrill, 1897 - (PECTINIDAE)
- islandica rotundata, Arctica islandica rotundata (A. Braun, 1845) - (ARCTICIDAE)
- islandicoides, Pelecyora islandicoides (J.B.P.A. Lamarck, 1818 †) - (VENERIDAE) (FOSSIL)
- islandicum, Buccinum islandicum (L.C. Kiener, 1840) - (BUCCINIDAE)
- islandicum, Buccinum islandicum H.A. Schlesch, 1924 - syn of: Buccinum polare J.E. Gray, 1839 - (BUCCINIDAE)
- islandicum, Clinocardium islandicum J.G. Bruguière, 1789 - syn of: Ciliatocardium ciliatum (O. Fabricius, 1780) - (CARDIIDAE)
- islandicum, Cardium islandicum Bruguiére, 1789 † - syn of: Ciliatocardium smekhovi A.I. Kafanov & Savizky, 1982 † - (CARDIIDAE) (FOSSIL)
- islandicum striata, Tritonium islandicum striata A.T. von Middendorff, 1849 - syn of: Colus gracilis (da Costa, 1778) - (BUCCINIDAE)
- islandicum sulcata, Buccinum islandicum sulcata A.T. von Middendorff, 1849 - syn of: Colus islandicus (N.P. Mohr, 1786) - (BUCCINIDAE)
- islandicus, Colus islandicus (N.P. Mohr, 1786) - (BUCCINIDAE)
- islandicus, Colus islandicus A.T. von Middendorff, 1849 - syn of: Colus islandicus (N.P. Mohr, 1786) - (BUCCINIDAE)
- islandicus, Chiton islandicus J.F. Gmelin, 1791 - syn of: Leptochiton sarsi P. Kaas, 1981 - (CHITONIDAE)
- islandicus, Fusus islandicus N.P. Mohr, 1786 - syn of: Colus islandicus (N.P. Mohr, 1786) - (FASCIOLARIIDAE)
- islandicus, Fusus islandicus J.H. Chemnitz, 1780 - syn of: Colus islandicus (N.P. Mohr, 1786) - (FASCIOLARIIDAE)
- islandicus, Murex islandicus J.F. Gmelin, 1791 - syn of: Colus islandicus (N.P. Mohr, 1786) - (MURICIDAE)
- islandicus, Microceramus islandicus C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- islandicus gallica, Colus islandicus gallica É.A.A. Locard, 1896 - (BUCCINIDAE)
- islandicus insculptus, Colus islandicus insculptus (C.W.S. Aurivillius, 1885) - (BUCCINIDAE)
- islandicus pugetensis, Pecten islandicus pugetensis I.M. Oldroyd, 1920 - syn of: Chlamys hastata (G.B. II Sowerby, 1842) - (PECTINIDAE)
- islandicus striata, Colus islandicus striata (A.T. von Middendorff, 1849) - (BUCCINIDAE)
- islatrinitatis, Varicorbula islatrinitatis (C.J. Maury, 1925 †) - (CORBULIDAE) (FOSSIL)
- isleana, Triphora isleana C. Vélain, 1878 - (TRIPHORIDAE)
- isletae, Napaeus isletae K. Groh & C.M. Ibáñez, 1992 - (ENIDAE)
- islipensis, Anisocardia islipensis J. Lycett, 1863 † - (ARCTICIDAE) (FOSSIL)
- islipensis, Corbula islipensis J. Lycett, 1863 † - (CORBULIDAE) (FOSSIL)
- islipensis, Gervillia islipensis Lycett † - (MYALINIDAE) (FOSSIL)
- Islipia, Genus Islipia Cox & Arkell, 1950 † (ARCHAEOGASTROPODA (UNASSIGNED)) (FOSSIL)
- islopa, Barbatia islopa W.P. Woodring, 1925 † - (ARCIDAE) (FOSSIL)
- ismaeli, Libycoceras ismaeli (C.A. von Zittel, 1895 †) - (SPHENODISCIDAE) (FOSSIL)
- ismailensis, Pseudopaludinella ismailensis V.V. Anistratenko, 1992 - (HYDROBIIDAE)
- ismailensis, Turricaspia ismailensis (A.N. Golikov & Y.I. Starobogatov, 1966) - (HYDROBIIDAE)
- ismailensis, Valvata cobalcescui ismailensis (Gozhik, 2007 †) - (VALVATIDAE) (FOSSIL)
- ismaili, Cypraedia ismaili Abbass, 1967 † - (OVULIDAE) (FOSSIL)
- ismarius, Strombus ismarius P.L. Duclos in J.C. Chenu, 1844 - syn of: Conomurex persicus (W.J. Swainson, 1821) - (STROMBIDAE)
- ismene, Vexillum ismene H. Turner, 2008 - (COSTELLARIIDAE)
- ismidicus, Aghdarbandites ismidicus (Arthaber, 1915 †) - (BEYRICHITIDAE) (FOSSIL)
- Ismidites, Genus Ismidites Arthaber, 1915 † (KHVALYNITIDAE) (FOSSIL)
- Isoarca, Genus Isoarca Muenster, 1842 † (ISOARCIDAE) (FOSSIL)
- ISOARCIDAE Keen, 1969 † - Family (BIVALVIA-PROTOBRANCHIA [Subclass]-NUCULANIDA [Order]-NUCULANOIDEA [Superfamily]) (FOSSIL)
- isocardia, Trachycardium isocardia (C. Linnaeus, 1758) - (CARDIIDAE)
- Isocardia, syn of: Genus Glossus G.S. Poli, 1795 (GLOSSIDAE)
- isocardia, Vulsella isocardia L.A. Reeve, 1858 - syn of: Vulsella fornicata (P. Forsskål in C. Niebuhr, 1775) - (PTERIIDAE)
- isocardia, Globivenus isocardia (Verrill, 1870) - (VENERIDAE)
- isocardia, Pelecyora isocardia (R.W. Dunker, 1845) - (VENERIDAE)
- isocardia, Dosinia isocardia R.W. Dunker, 1845 - syn of: Pelecyora isocardia (R.W. Dunker, 1845) - (VENERIDAE)
- isocardia, Antigona isocardia Verrill, 1870 - syn of: Globivenus isocardia (Verrill, 1870) - (VENERIDAE)
- ISOCARDIIDAE - syn of Family: GLOSSIDAE
- isocardioides, Cetoconcha isocardioides P. Dautzenberg & H. Fischer, 1897 - syn of: Cetomya tornata (J.G. Jeffreys, 1876) - (CETOCONCHIDAE)
- isocardioides, Cyrena isocardioides G.P. Deshayes, 1855 - syn of: Polymesoda anomala (G.P. Deshayes, 1855) - (CYRENIDAE)
- isocardioides, Haasica isocardioides (I. Lea, 1856) - (MYCETOPODIDAE)
- isocardioides, Poromya isocardioides P. Dautzenberg & H. Fischer, 1897 - syn of: Cetomya tornata (J.G. Jeffreys, 1876) - (POROMYIDAE)
- isocardioides, Cyclas isocardioides D. Dupuy, 1852 - syn of: Sphaerium cornea (C. Linnaeus, 1767) - (SPHAERIIDAE)
- Isochiton, syn of: Genus Ischnochiton J.E. Gray, 1847 (ISCHNOCHITONIDAE)
- Isoclanculus, Subgenus Clanculus (Isoclanculus) B.C. Cotton & F.C. Godfrey, 1934 (TROCHIDAE)
- Isoconcha, Genus Isoconcha P. Dautzenberg & H. Fischer, 1911 (BASTEROTIIDAE)
- Isoconus, Genus Isoconus J.K. Tucker & M.J. Tenorio, 2013 (CONIDAE)
- isocosmica, Edmondia isocosmica C. Gemmellaro, 1896 † - (EDMONDIIDAE) (FOSSIL)
- isocostata, Heteroceras isocostata Kakabadze, 1975 † - (HETEROCERATIDAE) (FOSSIL)
- isocostatum, Acrioceras isocostatum Kakabadze, 1981 † - (ANCYLOCERATIDAE) (FOSSIL)
- Isocrassina, syn of: Genus Astarte J. de C. Sowerby, 1816 (ASTARTIDAE)
- Isocyprina, Genus Isocyprina Röder, 1882 † (ARCTICIDAE) (FOSSIL)
- ISOCYPRINIDAE R. N. Gardner, 2005 † - Family (BIVALVIA-HETERODONTA [Subclass]-EUHETERODONTA [Infraclass]-IMPARIDENTIA [Superorder]-VENERIDA [Order]-VENEROIDEA [Superfamily]) (FOSSIL)
- Isodaphne, Genus Isodaphne C.F. Laseron, 1954 (RAPHITOMIDAE)
- Isodoma, syn of: Subgenus Polymesoda (Geloina) J.E. Gray, 1842 (CYRENIDAE)
- isodoma, Mangelia isodoma R.P.J. Hervier, 1897 - (MANGELIIDAE)
- Isodomella, Genus Isodomella Kobayashi & Suzuki, 1939 † (NEOMIODONTIDAE) (FOSSIL)
- isodon, Labyrinthus isodon (L. Pfeiffer, 1852) - (CAMAENIDAE)
- isodon, Chondrina isodon A. Bofill & J.B. Aguilar-Amat, 1904 - syn of: Chondrina arigonis E.A. Rossmässler, 1859 - (CHONDRINIDAE)
- Isodontocardia, Genus Isodontocardia P.U. Middelfart, 2002 (CONDYLOCARDIIDAE)
- Isodora, syn of: Genus Bulinus O.F. Müller, 1781 (PLANORBIDAE)
- isodorum, Beloitoceras isodorum (Billings, 1865 †) - (ONCOCERATIDAE) (FOSSIL)
- isognomoides, Isognomon isognomoides Stahl, 1824 † - (PTERIIDAE) (FOSSIL)
- isognomon, Perna isognomon C. Linnaeus, 1758 - syn of: Isognomon isognomum (C. Linnaeus, 1758) - (MYTILIDAE)
- Isognomon, Genus Isognomon J. Lightfoot, 1786 (PTERIIDAE)
- isognomon, Isognomon isognomon (C. Linnaeus, 1758 †) - (PTERIIDAE) (FOSSIL)
- isognomon brachyptera, Perna isognomon brachyptera E.C. Von Martens, 1894 - syn of: Isognomon isognomum (C. Linnaeus, 1758) - (MYTILIDAE)
- isognomon brachyptera, Isognomon isognomon brachyptera E.C. Von Martens, 1894 - syn of: Isognomon isognomum (C. Linnaeus, 1758) - (PTERIIDAE)
- isognomon obliqua, Perna isognomon obliqua E.C. Von Martens, 1894 - syn of: Isognomon isognomum (C. Linnaeus, 1758) - (MYTILIDAE)
- isognomon obliqua, Isognomon isognomon obliqua E.C. Von Martens, 1894 - syn of: Isognomon isognomum (C. Linnaeus, 1758) - (PTERIIDAE)
- ISOGNOMONIDAE - syn of Family: PTERIIDAE
- isognomonoides, Isognomon isognomonoides Stahl, 1824 † - (PTERIIDAE) (FOSSIL)
- Isognomonostoma, syn of: Genus Isognomostoma L.I. Fitzinger, 1833 (HELICIDAE)
- Isognomostoma, Genus Isognomostoma L.I. Fitzinger, 1833 (HELICIDAE)
- isognomostoma, Isognomostoma isognomostoma (J.S. Schröter, 1784) - (HELICIDAE)
- isognomostomos, Isognomostoma isognomostomos J.S. Schröter, 1784 - syn of: Isognomostoma isognomostoma (J.S. Schröter, 1784) - (HELICIDAE)
- isognomum, Ostrea isognomum C. Linnaeus, 1758 - syn of: Isognomon isognomum (C. Linnaeus, 1758) - (OSTREIDAE)
- isognomum, Isognomon isognomum (C. Linnaeus, 1758) - (PTERIIDAE)
- isognonoides, Isognomon isognonoides (Stahl) † - (PTERIIDAE) (FOSSIL)
- Isognostoma, Helix Isognostoma J.D.W. Hartmann, 1840 - syn of: Isognomostoma isognomostoma (J.S. Schröter, 1784) - (HELICIDAE)
- isogona, Perna isogona L.A.G. d'A. Bosc, 1801 - syn of: Isognomon isognomum (C. Linnaeus, 1758) - (MYTILIDAE)
- isogona, Isognomon isogona L.A.G. d'A. Bosc, 1801 - syn of: Isognomon isognomum (C. Linnaeus, 1758) - (PTERIIDAE)
- isogonia, Gymnobela isogonia (W.H. Dall, 1908) - (RAPHITOMIDAE)
- isogonum, Ostrea isogonum C. Linnaeus, 1767 - syn of: Isognomon isognomum (C. Linnaeus, 1758) - (OSTREIDAE)
- isogonum, Isognomon isogonum C. Linnaeus, 1767 - syn of: Isognomon isognomum (C. Linnaeus, 1758) - (PTERIIDAE)
- Isogonum, syn of: Genus Isognomon J. Lightfoot, 1786 (PTERIIDAE)
- isogonus, Birgella subglobosus isogonus (T. Say, 1829) - (HYDROBIIDAE)
- isogramma, Ilyanassa isogramma W.H. Dall, 1892 † - (NASSARIIDAE) (FOSSIL)
- Isohomoceras, Genus Isohomoceras Ruzhencev & Bogoslovskaya, 1971 † (HOMOCERATIDAE) (FOSSIL)
- Isohoplites, Subgenus Hoplites (Isohoplites) Casey, 1961 † (HOPLITIDAE) (FOSSIL)
- isoicus, Obscurella isoicus P. Fagot, 1889 - syn of: Cochlostoma obscurum laburdense (L. de Folin & F. Bèrillon, 1877) - (COCHLOSTOMATIDAE)
- isolata, Bythinella isolata H.D. Boeters, 2006 - (BYTHINELLIDAE)
- isolata, Climocella isolata J.F. Goulstone, 1997 - (CHAROPIDAE)
- isolata, Liratilia isolata R.K. Dell, 1956 - (COLUMBELLIDAE)
- isolata, Parvikellia isolata C.F. Laseron, 1956 - (GALEOMMATIDAE)
- isolata, Pyrgulopsis isolata R. Hershler & D.W. Sada, 1987 - (HYDROBIIDAE)
- isolata, Onoba isolata W.F. Ponder & H.W. Worsfold, 1994 - (RISSOIDAE)
- isolata, Alvania isolata (C.F. Laseron, 1956) - (RISSOIDAE)
- isolata, Zebina isolata C.F. Laseron, 1956 - syn of: Alvania isolata (C.F. Laseron, 1956) - (ZEBINIDAE)
- isolates, Onoba isolates W.F. Ponder & H.W. Worsfold, 1994 - (RISSOIDAE)
- isolatum, Cristilabrum isolatum G.A. Solem, 1985 - (CAMAENIDAE)
- isolatum, Crassotornoceras isolatum Becker, 1993 † - (TORNOCERATIDAE) (FOSSIL)
- isolatus, Glacidorbis isolatus W.F. Ponder & G.J. Avern, 2000 - (GLACIDORBIDAE)
- isolda, Cucullaea isolda C.J. Maury, 1930 † - (CUCULLAEIDAE) (FOSSIL)
- isolda, Tropaeas isolda K.H.J. Thiele, 1925 - (PYRAMIDELLIDAE)
- Isolderopa, Genus Isolderopa Stanisic, 2010 (CHAROPIDAE)
- Isolimea, Genus Isolimea Iredale, 1929 † (ISOLIMEIDAE) (FOSSIL)
- ISOLIMEIDAE Kasum-Zade, 2003 † - Family (BIVALVIA-PTERIOMORPHIA [Subclass]-LIMIDA [Order]-LIMOIDEA [Superfamily]) (FOSSIL)
- isolirata, Cardiomya isolirata Bernard, 1969 - syn of: Cardiomya pectinata (Carpenter, 1865) - (CUSPIDARIIDAE)
- isolirata, Cardiomya isolirata F.R. Bernard, 1969 - syn of: Cardiomya pectinata (Carpenter, 1865) - (CUSPIDARIIDAE)
- Isoltia, syn of: Genus Alcadia J.E. Gray, 1840 (HELICINIDAE)
- isomatratus, Conus isomatratus W.H. Dall, 1896 † - (CONIDAE) (FOSSIL)
- isomella, Zafrona isomella (P.L. Duclos, 1840) - (COLUMBELLIDAE)
- isomella, Columbella isomella P.L. Duclos, 1840 - syn of: Zafrona isomella (P.L. Duclos, 1840) - (COLUMBELLIDAE)
- isomella nebulosa, Zafrona isomella nebulosa (A.A. Gould, 1860) - (COLUMBELLIDAE)
- isomella notata, Columbella isomella notata R.P.J. Hervier, 1899 - syn of: Zafrona isomella (P.L. Duclos, 1840) - (COLUMBELLIDAE)
- isomella transversa, Columbella isomella transversa R.P.J. Hervier, 1899 - syn of: Zafrona isomella (P.L. Duclos, 1840) - (COLUMBELLIDAE)
- isomera, Nassa isomera É.A.A. Locard, 1886 - syn of: Tritia reticulata (C. Linnaeus, 1758) - (NASSARIIDAE)
- isomeres, Monetaria isomeres T. Iredale, 1939 - syn of: Monetaria moneta (C. Linnaeus, 1758) - (CYPRAEIDAE)
- isomeres, Imbricaria isomeres J.C. Melvill & E.R. Sykes, 1897 - syn of: Imbricaria vanikorensis (J.R.C. Quoy & J.P. Gaimard, 1833) - (MITRIDAE)
- isomeres, Minnivola isomeres T. Iredale, 1939 - syn of: Minnivola pyxidata (I. von Born, 1778) - (PECTINIDAE)
- Isomeria, Genus Isomeria J.A. Albers, 1850 (CAMAENIDAE)
- isomitratus, Conus isomitratus W.H. Dall, 1896 † - syn of: Conus isomatratus W.H. Dall, 1896 † - (CONIDAE) (FOSSIL)
- Isomonia, Genus Isomonia P. Dautzenberg & H. Fischer, 1896 (ANOMIIDAE)
- isomorpha, Pleurotomaria isomorpha C. Gemmellaro, 1889 † - (PLEUROTOMARIIDAE) (FOSSIL)
- isomorphus, Adrianites isomorphus C. Gemmellaro, 1888 † - (ADRIANITIDAE) (FOSSIL)
- Isonema, Genus Isonema Meek & Worthen, 1866 † (ANOMPHALIDAE) (FOSSIL)
- Isonema, syn of: Genus Littorina A.E.J. Férussac, 1822 (LITTORINIDAE)
- Isonomia, syn of: Genus Isomonia P. Dautzenberg & H. Fischer, 1896 (ANOMIIDAE)
- isonota, Portlandia isonota (E.C. Von Martens, 1881) - (YOLDIIDAE)
- isophanes, Eucithara isophanes (R.P.J. Hervier, 1897) - (MANGELIIDAE)
- isopleura, Terebra isopleura H.A. Pilsbry & H.N. Lowe, 1932 - syn of: Terebra larvaeformis R.B. Hinds, 1844 - (TEREBRIDAE)
- isoplicata, Biplica isoplicata W.P. Popenoe, 1957 † - (RINGICULIDAE) (FOSSIL)
- Isopristes, Genus Isopristes Nicol & Allen, 1953 † (CARDIIDA (UNASSIGNED)) (FOSSIL)
- Isora, syn of: Genus Mitra J.B.P.A. Lamarck, 1798 (MITRIDAE)
- Isorobitella, syn of: Genus Aligena I. Lea, 1843 (LASAEIDAE)
- Isorropodon, Genus Isorropodon R. Sturany, 1896 (VESICOMYIDAE)
- Isorthoceras, Genus Isorthoceras Flower, 1962 † (PROTEOCERATIDAE) (FOSSIL)
- isosceles, Austrocardiella isosceles (B.C. Cotton, 1930) - (CONDYLOCARDIIDAE)
- isosceles, Benthocardiella isosceles (B.C. Cotton, 1930) - syn of: Austrocardiella isosceles (B.C. Cotton, 1930) - (CONDYLOCARDIIDAE)
- isosceles, Condylocardia isosceles (B.C. Cotton, 1930) - syn of: Austrocardiella isosceles (B.C. Cotton, 1930) - (CONDYLOCARDIIDAE)
- isosceles, Mipus isosceles K.H. Barnard, 1959 - syn of: Mipus rosaceus (E.A. Smith, 1903) - (MURICIDAE)
- isosceles, Pinna isosceles C. Hedley, 1924 - syn of: Pinna bicolor J.F. Gmelin, 1791 - (PINNIDAE)
- isosceles, Rissoina isosceles J.C. Melvill & R. Standen, 1903 - (RISSOINIDAE)
- isosceles, Abra isosceles (C. Hedley, 1909) - (SEMELIDAE)
- isosocles, Astarte isosocles J. Gardner, 1926 † - (ASTARTIDAE) (FOSSIL)
- Isospira, Genus Isospira Koken , 1897 † (CYRTONELLIDAE) (FOSSIL)
- ISOSPIRIDAE - syn of Family: CYRTONELLIDAE (FOSSIL)
- Isotancredia, Genus Isotancredia † (CARDIIDA (UNASSIGNED)) (FOSSIL)
- isotelorum, Diestoceras isotelorum E. Strand, 1934 † - (DIESTOCERATIDAE) (FOSSIL)
- isotoma, Achatina isotoma L. Pfeiffer, 1854 - (ACHATINIDAE)
- Isotriphora, Genus Isotriphora B.C. Cotton & F.C. Godfrey, 1931 (TRIPHORIDAE)
- isovokyense, Kamerunoceras isovokyense M. Collignon, 1965 † - (ACANTHOCERATIDAE) (FOSSIL)
- isovokyense, Mantelliceras isovokyense M. Collignon, 1964 † - syn of: Mantelliceras mantelli (J. de C. Sowerby, 1814 †) - (ACANTHOCERATIDAE) (FOSSIL)
- isovokyense, Gaudryceras isovokyense M. Collignon, 1964 † - (GAUDRYCERATIDAE) (FOSSIL)
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