- Ispharina, Subgenus Torquesia (Ispharina) Vjalov & Solun, 1936 † (TURRITELLIDAE) (FOSSIL)
- ispida, Oliva ispida P.F. Röding, 1798 - syn of: Oliva oliva (C. Linnaeus, 1758) - (OLIVIDAE)
- ispidula, Aesopus ispidula (C. Linnaeus, 1758) - (COLUMBELLIDAE)
- Ispidula, Subgenus Oliva (Ispidula) Gray, 1847 † (OLIVIDAE) (FOSSIL)
- ispidula, Oliva ispidula F.P. Marrat, 1871 - syn of: Oliva oliva (C. Linnaeus, 1758) - (OLIVIDAE)
- ispidula, Oliva ispidula G. Fischer von Waldheim, 1807 - syn of: Oliva oliva (C. Linnaeus, 1758) - (OLIVIDAE)
- Ispidula, syn of: Genus Oliva J.G. Bruguičre, 1789 (OLIVIDAE)
- ispidula algida, Oliva ispidula algida E.G. Vanatta, 1915 - syn of: Oliva oliva (C. Linnaeus, 1758) - (OLIVIDAE)
- ispidula gratiosa, Oliva ispidula gratiosa E.G. Vanatta, 1915 - syn of: Oliva oliva (C. Linnaeus, 1758) - (OLIVIDAE)
- ispidula lacteana, Oliva ispidula lacteana P. Dautzenberg, 1927 - syn of: Oliva tigridella lacteana P. Dautzenberg, 1927 - (OLIVIDAE)
- ispidula longispira, Oliva ispidula longispira F.G. Bridgman, 1906 - syn of: Oliva oliva (C. Linnaeus, 1758) - (OLIVIDAE)
- israelskyi, Turbonilla israelskyi A.M. Strong & L.G. Hertlein, 1939 - (PYRAMIDELLIDAE)
- Issa, syn of: Genus Colga L.S.R. Bergh, 1880 (POLYCERIDAE)
- issa, Mastonia issa F.P. Jousseaume, 1898 - (TRIPHORIDAE)
- issawii, Acrilla issawii Abbass, 1967 † - (EPITONIIDAE) (FOSSIL)
- Isselentia, Genus Isselentia W.E. Collinge, 1901 (ARIOPHANTIDAE)
- isseli, Arion isseli (M. Lessona & C. Pollonera, 1882) - (ARIONIDAE)
- isseli, Clypeomorus isseli A. Pagenstecher, 1877 - syn of: Clypeomorus petrosa isselii (A. Pagenstecher, 1877) - (CERITHIIDAE)
- isseli, Granaria isseli E. Caziot, 1910 - syn of: Abida stabilei E.C. Von Martens, 1865 - (CHONDRINIDAE)
- isseli, Clausilia isseli A. Villa & J. Villa, 1868 - syn of: Clausilia bidentata crenulata A. Risso, 1826 - (CLAUSILIIDAE)
- isseli, Bothropoma isseli (K.H.J. Thiele, 1924) - (COLLONIIDAE)
- isseli, Diplommatina isseli H.H. Godwin-Austen, 1889 - (DIPLOMMATINIDAE)
- isseli, Fuciniceras isseli (Fucini, 1900 †) - (HILDOCERATIDAE) (FOSSIL)
- isseli, Pyrgula isseli B.M. Logvinenko & Y.I. Starobogatov, 1968 - (HYDROBIIDAE)
- isseli, Monacha isseli C. De Stefani, 1883 - syn of: Eutheba cantiana (G. Montagu, 1803) - (HYGROMIIDAE)
- isseli, Peasiella isseli (A. Issel, 1869) - (LITTORINIDAE)
- isseli, Eucithara isseli (G. Nevill & H. Nevill, 1875) - (MANGELIIDAE)
- isseli, Granulina isseli (G. Nevill & H. Nevill, 1875) - (MARGINELLIDAE)
- isseli, Melanopsis isseli J.R. Bourguignat, 1884 - (MELANOPSIDAE)
- isseli, Zeuxis isseli J. Bisacchi, 1930 - syn of: Nassarius haldemani (R.W. Dunker, 1847) - (NASSARIIDAE)
- isseli, Ostrea stentina isseli M.E.J. Bucquoy, P. Dautzenberg & G.F. Dollfus, 1889 - (OSTREIDAE)
- isseli, Ferrissia isseli (J.R. Bourguignat, 1866) - (PLANORBIDAE)
- isseli, Planorbarius isseli (F. Sacco, 1886 †) - (PLANORBIDAE) (FOSSIL)
- isseli, Cingulina isseli (G.W. Tryon, 1886) - (PYRAMIDELLIDAE)
- isseli, Obtusella isseli (G.W. Tryon, 1886) - (RISSOIDAE)
- isseli, Sabatia isseli L.M.D. Bellardi, 1877 † - (SCAPHANDRIDAE) (FOSSIL)
- isseli, Arcopagia isseli (H. Adams, 1871) - (TELLINIDAE)
- isseli, Tellina isseli H. Adams, 1871 - syn of: Arcopagia isseli (H. Adams, 1871) - (TELLINIDAE)
- isseli, Arcopagia isseli H. Adams, 1871 - syn of: Arcopagia isseli (H. Adams, 1871) - (TELLINIDAE)
- isseli, Gibbula isseli T.A. de M. Monterosato, 1888 - syn of: Gibbula racketti (B.C.M. Payraudeau, 1826) - (TROCHIDAE)
- isseli, Anodonta isseli J.R. Bourguignat, 1883 - syn of: Anodonta cygnea (C. Linnaeus, 1758) - (UNIONIDAE)
- isseli, Vivipara isseli J.R. Bourguignat, 1880 - syn of: Viviparus listeri (E. Forbes & S.C.T. Hanley, 1849) - (VIVIPARIDAE)
- isseli carinata, Risella isseli carinata P.M. Pallary, 1926 - syn of: Peasiella isseli (A. Issel, 1869) - (LITTORINIDAE)
- isseli cernica, Eucithara isseli cernica (G. Nevill & H. Nevill, 1875) - (MANGELIIDAE)
- isseli mauritiana, Peasiella isseli mauritiana J.M.R.M. Viader, 1951 - syn of: Peasiella mauritiana (J.M.R.M. Viader, 1951) - (LITTORINIDAE)
- isseli undata, Risella isseli undata P.M. Pallary, 1926 - syn of: Peasiella isseli (A. Issel, 1869) - (LITTORINIDAE)
- Isselia, syn of: Genus Stosicia Š. Brusina, 1870 (ZEBINIDAE)
- isseliana, Geminula isseliana (J.R. Bourguignat in A. Issel, 1865) - (ENIDAE)
- isselianum, Zospeum isselianum C. Pollonera, 1887 - (ELLOBIIDAE)
- isselianus, Bulimus isselianus J.R. Bourguignat in A. Issel, 1865 - syn of: Geminula isseliana (J.R. Bourguignat in A. Issel, 1865) - (BULIMULIDAE)
- Isseliella, Genus Isseliella Weinkauff, 1881 (ZEBINIDAE)
- isselii, Acicula isselii (Flach, 1889) † - (ACICULIDAE) (FOSSIL)
- isselii, Acteocina isselii (H.A. Pilsbry, 1893) - (ACTEOCINIDAE)
- isselii, Clypeomorus petrosa isselii (A. Pagenstecher, 1877) - (CERITHIIDAE)
- isselioides, Matteiceras isselioides Dommergues & al., 1985 † - (HILDOCERATIDAE) (FOSSIL)
- Issena, syn of: Genus Colga L.S.R. Bergh, 1880 (POLYCERIDAE)
- isserica, Leiostyla isserica A. Letourneux, 1870 - syn of: Leiostyla anglica (W. Wood, 1828) - (LAURIIDAE)
- isserica, Oxychilus isserica (J.R. Bourguignat, 1868) - (OXYCHILIDAE)
- isshikiensis, Hirtomurex isshikiensis (T. Shikama, 1971) - (MURICIDAE)
- issikensis, Parvatella issikensis T.D.A. Cockerell, 1928 - syn of: Macrochlamys sogdiana (E.C. Von Martens, 1871) - (ARIOPHANTIDAE)
- Issina, Genus Issina F.P. Jousseaume, 1898 (GALEOMMATIDAE)
- issina, Issina issina F.P. Jousseaume, 1898 - (GALEOMMATIDAE)
- issykkulense, Pisidium issykkulense (Z.I. Izzatullaev & Y.I. Starobogatov, 1986) - (SPHAERIIDAE)
- issykkulense, Odhneripisidium issykkulense Z.I. Izzatullaev & Y.I. Starobogatov, 1986 - syn of: Pisidium issykkulense (Z.I. Izzatullaev & Y.I. Starobogatov, 1986) - (SPHAERIIDAE)
- issykkulensis, Pseudocaspia issykkulensis (S. Clessin, 1894) - (HYDROBIIDAE)
- issykulensis, Anisus issykulensis (S. Clessin, 1907) - (PLANORBIDAE)
- ista, Cattania ista A. Reischütz, N. Steiner-Reischütz & P.L. Reischütz, 2016 - (HELICIDAE)
- ista, Turbonilla ista P. Bartsch, 1917 - (PYRAMIDELLIDAE)
- istanbulensis, Bythinella istanbulensis M.Z. Yildirim, Ü. Kebapçi & A. Yüce, 2014 - (BYTHINELLIDAE)
- istapensis, Bulimulus istapensis J.C.H. Crosse & P.H. Fischer, 1873 - syn of: Bulimulus unicolor (G.B. I Sowerby, 1833) - (BULIMULIDAE)
- Isterites, Genus Isterites Barthel, 1975 † (AMMONOIDEA (UNASSIGNED)) (FOSSIL)
- isthmia, Mactra isthmia F.P. Jousseaume, 1888 - syn of: Mactra olorina R.A. Philippi, 1846 - (MACTRIDAE)
- Isthmia, Subgenus Vertigo (Isthmia) J.E. Gray, 1821 (VERTIGINIDAE)
- Isthmia, syn of: Genus Vertigo O.F. Müller, 1774 (VERTIGINIDAE)
- isthmica, Leptachatina isthmica C.M.F. Ancey & E.R. Sykes, 1899 - (AMASTRIDAE)
- isthmica, Muracypraea isthmica (Schilder, 1927 †) - (CYPRAEIDAE) (FOSSIL)
- isthmica, Eumetadrillia isthmica (J. Brown & H.A. Pilsbry, 1911 †) - (DRILLIIDAE) (FOSSIL)
- isthmica, Harpa isthmica E.H. Vokes, 1984 † - (HARPIDAE) (FOSSIL)
- isthmica, Oxyrhombus isthmica H.A. Pilsbry, 1926 - (HELICINIDAE)
- isthmica, Mactrotoma isthmica (H.A. Pilsbry & H.N. Lowe, 1932) - (MACTRIDAE)
- isthmica, Mactra isthmica H.A. Pilsbry & H.N. Lowe, 1932 - syn of: Mactrotoma isthmica (H.A. Pilsbry & H.N. Lowe, 1932) - (MACTRIDAE)
- isthmica, Acila isthmica J. Brown & H.A. Pilsbry, 1911 † - (NUCULIDAE) (FOSSIL)
- isthmica, Odostomia isthmica A.M. Strong & L.G. Hertlein, 1939 - (PYRAMIDELLIDAE)
- isthmica, Guestieria isthmica H.A. Pilsbry, 1930 - (SCOLODONTIDAE)
- isthmica burica, Acila isthmica burica A.A. Olsson, 1942 - (NUCULIDAE)
- isthmica fonsecana, Mactrotoma isthmica fonsecana L.G. Hertlein & A.M. Strong, 1950 - (MACTRIDAE)
- isthmicus, Cerastoderma isthmicus A. Issel, 1869 - syn of: Cerastoderma glaucum (J.G. Bruguière, 1789) - (CARDIIDAE)
- isthmicus, Trophon isthmicus Bose, 1906 † - (MURICIDAE) (FOSSIL)
- isthmicus, Planorbis isthmicus H.A. Pilsbry, 1920 - syn of: Biomphalaria kuhniana (S. Clessin, 1883) - (PLANORBIDAE)
- isthmiea, Odostomia isthmiea A.M. Strong & L.G. Hertlein, 1939 - syn of: Odostomia isthmica A.M. Strong & L.G. Hertlein, 1939 - (PYRAMIDELLIDAE)
- istiusmodi, Oscilla istiusmodi Peñas & Rolán, 2017 - (PYRAMIDELLIDAE)
- istmica, Anadara istmica Perrilliat, 1960 † - syn of: Anadara actinophora W.H. Dall, 1898 † - (ARCIDAE) (FOSSIL)
- istmica, Evalea istmica (A.M. Strong & L.G. Hertlein, 1939) - (PYRAMIDELLIDAE)
- istoka, Bythinella istoka P. Glöer & V.M. Pešic, 2014 - (BYTHINELLIDAE)
- istracosta, Stabilea costata istracosta H. Nordsieck, 2007 - (CLAUSILIIDAE)
- Istreites, Genus Istreites Simionescu , 1913 † (PTYCHITIDAE) (FOSSIL)
- istriana, Chondrina avenacea istriana P. Ehrmann, 1931 - (CHONDRINIDAE)
- istriana, Faustina istriana C.A. Westerlund, 1888 - syn of: Josephinella sadleriana (E.A. Rossmässler, 1838) - (HELICIDAE)
- Istriana, Genus Istriana F. Velkovrh, 1971 (HYDROBIIDAE)
- istrianus, Jujubinus istrianus G.S. Coen, 1934 - syn of: Jujubinus exasperatus istrianus G.S. Coen, 1933 - (TROCHIDAE)
- istrianus, Jujubinus exasperatus istrianus G.S. Coen, 1933 - (TROCHIDAE)
- istriensis, Conus istriensis G.D. Nardo, 1847 - syn of: Lautoconus ventricosus (J.F. Gmelin, 1791) - (CONIDAE)
- istriensis, Clathroconcha istriensis G.S. Coen, 1934 - syn of: Ctena decussata (O.G. Costa, 1829) - (LUCINIDAE)
- Istycoceras, Genus Istycoceras Pavlov , 1967 † (ADRIANITIDAE) (FOSSIL)
- isztimeri, Alocolytoceras isztimeri Galácz & Kassai, 2012 † - (LYTOCERATIDAE) (FOSSIL)
- Itaborahia, Subgenus Bulimulus (Itaborahia) C.J. Maury, 1935 (BULIMULIDAE)
- itaboraiensis, Gastrocopta itaboraiensis R.B. Salvador & L.R.L. Simone, 2013 † - (GASTROCOPTIDAE) (FOSSIL)
- itajaiensis, Oriocrassatella itajaiensis Rocha-Campos, 1970 † - (ORIOCRASSATELLIDAE) (FOSSIL)
- itala, Charpentieria itala (G. Von Martens, 1824) - (CLAUSILIIDAE)
- Itala, syn of: Genus Charpentieria G. Stabile, 1864 (CLAUSILIIDAE)
- itala, Helicella itala (C. Linnaeus, 1758) - (HYGROMIIDAE)
- itala albopustulata, Charpentieria itala albopustulata (G.J. De Cristofori & G. Jan, 1832) - (CLAUSILIIDAE)
- itala allatollae, Charpentieria itala allatollae (F. Käufel, 1928) - (CLAUSILIIDAE)
- itala baldensis, Charpentieria itala baldensis (J.G.F. de Charpentier, 1852) - (CLAUSILIIDAE)
- itala braunii, Charpentieria itala braunii (E.A. Rossmässler, 1836) - (CLAUSILIIDAE)
- itala latestriata, Charpentieria itala latestriata (H.C. Küster, 1850) - (CLAUSILIIDAE)
- itala leccoensis, Charpentieria itala leccoensis (A.de Saint-Simon, 1856) - (CLAUSILIIDAE)
- itala nigra, Charpentieria itala nigra (A. Issel, 1866) - (CLAUSILIIDAE)
- itala pampelonensis, Helicella itala pampelonensis (A. Schmidt, 1856) - (HYGROMIIDAE)
- itala punctata, Charpentieria itala punctata (A. Michaud, 1831) - (CLAUSILIIDAE)
- itala rubiginea, Charpentieria itala rubiginea (E.A. Rossmässler, 1836) - (CLAUSILIIDAE)
- itala serravalensis, Charpentieria itala serravalensis (H. Nordsieck, 1963) - (CLAUSILIIDAE)
- italiana, Medora italiana (H.C. Küster, 1847) - (CLAUSILIIDAE)
- italiana, Odostomia italiana (J.X. Corgan & J.J. Van Aartsen, 1998) - (PYRAMIDELLIDAE)
- italiana garganensis, Medora italiana garganensis A.J. Wagner, 1918 - (CLAUSILIIDAE)
- italiana kobelti, Medora italiana kobelti H. Nordsieck, 1970 - (CLAUSILIIDAE)
- italiana milettiana, Medora italiana milettiana F.L. Giusti, 1967 - (CLAUSILIIDAE)
- italiana punctulata, Medora italiana punctulata H.C. Küster, 1847 - syn of: Medora punctulata (H.C. Küster, 1847) - (CLAUSILIIDAE)
- italica, Chelidonura africana italica M. Sordi, 1980 - (AGLAJIDAE)
- italica, Bithynia italica M. Paulucci, 1879 - (BITHYNIIDAE)
- italica, Crepidula italica J.L.M. Defrance, 1818 - syn of: Crepidula unguiformis J.B.P.A. Lamarck, 1822 - (CALYPTRAEIDAE)
- italica, Diodora italica (J.L.M. Defrance, 1820) - (FISSURELLIDAE)
- italica, Mourlonia italica Spitz, 1907 † - (GOSSELETINIDAE) (FOSSIL)
- italica, Helix italica G. Stabile, 1864 - syn of: Faustina illyrica (G. Stabile, 1864) - (HELICIDAE)
- italica, Nassa italica A. Issel, 1869 - syn of: Cyclope neritea (C. Linnaeus, 1758) - (NASSARIIDAE)
- italica, Nassa italica C. Mayer, 1876 - syn of: Nassarius cabrierensis italicus (C. Mayer, 1876 ) - (NASSARIIDAE)
- italica, Ostrea italica J.L.M. Defrance, 1821 - syn of: Neopycnodonte cochlear (G.S. Poli, 1795) - (OSTREIDAE)
- italica, Cycloclymenia helenae italica Renz, 1914 † - (PHENACOCERATIDAE) (FOSSIL)
- italica, Mareleptopoma italica (S. Raffi & M. Taviani, 1985) - syn of: Mareleptopoma minor (J. Almera & A. Bofill, 1898) - (PICKWORTHIIDAE)
- italica, Sepia italica A. Risso, 1854 - syn of: Sepia elegans H.M.D. de Blainville, 1827 - (SEPIIDAE)
- italica, Oxyloma italica G. Jan in A. Villa, 1841 - syn of: Oxyloma elegans (A. Risso, 1826) - (SUCCINEIDAE)
- italica, Callista italica (J.L.M. Defrance, 1818 †) - (VENERIDAE) (FOSSIL)
- italica, Pliocardia italica S. Kiel & M. Taviani, 2017 † - (VESICOMYIDAE) (FOSSIL)
- italica vasconiensis, Diodora italica vasconiensis A.E.M. Cossmann & M.A. Peyrot, 1916 † - (FISSURELLIDAE) (FOSSIL)
- italicum, Buccinum italicum C. Mayer, 1876 - syn of: Nassarius cabrierensis italicus (C. Mayer, 1876 ) - (BUCCINIDAE)
- italicum, Prodactylioceras italicum (Fucini, 1900 †) - (DACTYLIOCERATIDAE) (FOSSIL)
- italicum, Reynesoceras italicum Fucini, 1900 † - syn of: Prodactylioceras italicum (Fucini, 1900 †) - (DACTYLIOCERATIDAE) (FOSSIL)
- italicum, Pisidium italicum S. Clessin, 1877 - syn of: Pisidium casertanum (Poli, 1791) - (SPHAERIIDAE)
- italicus, Goniochilus italicus (N.I. Andrusov, 1890 †) - (HYDROBIIDAE) (FOSSIL)
- italicus, Ectocentrites italicus (Meneghini, 1882 †) - (LYTOCERATIDAE) (FOSSIL)
- italicus, Nassarius cabrierensis italicus (C. Mayer, 1876 ) - (NASSARIIDAE)
- italicus, Strombus italicus G. Bonelli, 1825 † - syn of: Persististrombus coronatus (J.L.M. Defrance, 1827 †) - (STROMBIDAE) (FOSSIL)
- italicus, Aegopis italicus W. Kobelt, 1876 - (ZONITIDAE)
- italiensis, Rissoa italiensis A. Verduin, 1985 - (RISSOIDAE)
- italoi, Odostomia italoi A. Peñas & E. Rolán, 1999 - (PYRAMIDELLIDAE)
- Italoptygmatis, Genus Italoptygmatis Akopyan, 1973 † (GASTROPODA INCERTAE SEDIS) (FOSSIL)
- italowiana, Pleuroxia italowiana G.A. Solem, 1992 - (CAMAENIDAE)
- itama, Pleurotomella itama (J.C. Melvill, 1906) - (RAPHITOMIDAE)
- itamaracensis, Calyptraphorus itamaracensis Muniz, 1993 † - (ROSTELLARIIDAE) (FOSSIL)
- Itameta, syn of: Genus Pachymelania E.A. Smith, 1893 (THIARIDAE)
- itanhura, Episcynia itanhura L.R.L. Simone, 2012 - (TORNIDAE)
- itanosensis, Mastus itanosensis W.J.M. Maassen, 1995 - (ENIDAE)
- itararensis, Exochorhynchus itararensis R.J. Neves & al., 2014 † - (SANGUINOLITIDAE) (FOSSIL)
- Itatamba, Genus Itatamba Simóes & al., 1997 † (MEGADESMIDAE) (FOSSIL)
- itazuensis, Praeglyphioceras pseudosphaericum itazuensis Kolotukhina, 1938 † - (PRAEGLYPHIOCERATIDAE) (FOSSIL)
- itea, Cardinia itea A.V.M.D. D'Orbigny, 1850 † - (CARDINIIDAE) (FOSSIL)
- iteina, Pusia iteina J.C. Melvill, 1918 - syn of: Vexillum sculptile (L.A. Reeve, 1845) - (COSTELLARIIDAE)
- itelmenica, Littorina itelmenica V.N. Sinelnikova, 1990 - syn of: Littorina brevicula (R.A. Philippi, 1844) - (LITTORINIDAE)
- iteni, Pseudogregoryceras iteni Jeannet, 1951 † - (ASPIDOCERATIDAE) (FOSSIL)
- ithagenia, Phragmosphaera ithagenia (A.H. Clarke, 1904 †) - (PTEROTHECIDAE) (FOSSIL)
- ithia, Neptunea ithia (W.H. Dall, 1891) - (BUCCINIDAE)
- Ithiaesopus, Subgenus Aesopus (Ithiaesopus) A.A. Olsson & A. Harbison, 1953 (COLUMBELLIDAE)
- ithitoma, Neptunea ithitoma W.H. Dall, 1919 - syn of: Boreotrophon alaskanus W.H. Dall, 1902 - (BUCCINIDAE)
- ithitomus, Trophon ithitomus W.H. Dall, 1919 - syn of: Boreotrophon alaskanus W.H. Dall, 1902 - (MURICIDAE)
- ithomensis, Albinaria ithomensis H. Nordsieck, 1984 - (CLAUSILIIDAE)
- ithomensis raehlei, Albinaria ithomensis raehlei H. Nordsieck, 2014 - (CLAUSILIIDAE)
- ithychila, Gibberula ithychila J.R. le B. Tomlin, 1918 - syn of: Gibberula dulcis (E.A. Smith, 1904) - (CYSTISCIDAE)
- Ithycythara, Genus Ithycythara W.P. Woodring, 1928 (MANGELIIDAE)
- ithyocheilus, Eoacteon ithyocheilus N.F. Sohl, 1964 † - (ACTEONINIDAE) (FOSSIL)
- Ithyption, syn of: Genus Alopia H. Adams & A. Adams, 1855 (CLAUSILIIDAE)
- Itia, Genus Itia Marwick, 1931 † (MITROMORPHIDAE) (FOSSIL)
- itiensis, Joculator itiensis A. Cecalupo & I. Perugia, 2014 - (CERITHIOPSIDAE)
- itieri, Aulopoma itieri F.E. Guérin-Méneville, 1847 - (CYCLOPHORIDAE)
- itieri hofmeisteri, Aulopoma itieri hofmeisteri F.H. Troschel, 1847 - (CYCLOPHORIDAE)
- Itieria, Genus Itieria Favre, 1913 † (CYLINDROBULLINIDAE) (FOSSIL)
- itieriana, Pseudolimea itieriana (Pictet & C. Roux, 1852 †) - (LIMIDAE) (FOSSIL)
- itierianum, Protissotia itierianum d'Orbigny, 1841 † - (LYELLICERATIDAE) (FOSSIL)
- ITIERIIDAE Cossmann, 1896 † - Family (GASTROPODA-HETEROBRANCHIA [Subclass]-NERINEOIDEA [Superfamily]) (FOSSIL)
- Itimaites, Genus Itimaites Korn & Ebbighausen, 2006 † (MUENSTEROCERATIDAE) (FOSSIL)
- Itimaspira, Genus Itimaspira Heidelberger & al., 2009 † (LOPHOSPIRIDAE) (FOSSIL)
- itimensis, Megapronorites itimensis W. Korn & Ebbighausen, 2006 † - (PRONORITIDAE) (FOSSIL)
- itineralis, Tetrentodon itineralis C. de la Torre & P. Bartsch, 1972 - syn of: Tetrentodon itineraris C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- itinerans, Rhytidopoma honestum itinerans C. de la Torre & P. Bartsch, 1941 - (POMATIIDAE)
- itineraria, Chondrothyretes barbouri itineraria (C. de la Torre & P. Bartsch, 1938) - (POMATIIDAE)
- itineraris, Tetrentodon itineraris C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- itinerarium, Farcimen superbum itinerarium (C. de la Torre & P. Bartsch, 1942) - (MEGALOMASTOMIDAE)
- itineris, Liocallonia itineris C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- itinsae, Itinsaites itinsae McLearn, 1927 † - (OTOITIDAE) (FOSSIL)
- itinsae, Teloceras itinsae McLearn, 1927 † - (STEPHANOCERATIDAE) (FOSSIL)
- Itinsaites, Subgenus Normannites (Itinsaites) McLearn, 1927 † (OTOITIDAE) (FOSSIL)
- Itiopiana, Subgenus Subulina (Itiopiana) H.B. Preston, 1910 (SUBULINIDAE)
- Itiscala, Genus Itiscala Maxwell, 1992 † (TOFANELLIDAE) (FOSSIL)
- itoensis, Notomyrtea itoensis Itoigawa 1960 † - (LUCINIDAE) (FOSSIL)
- itohabei, Fusipagoda itohabei A. Kosyan & Y.I. Kantor, 2015 - (BUCCINIDAE)
- itoi, Aegista itoi J.T. Kuroda & M. Azuma, 1982 - (BRADYBAENIDAE)
- itoi, Tutcheria itoi I. Hayami, 1969 † - (CARDITIDAE) (FOSSIL)
- itoi, Thracia itoi T. Habe, 1961 - (THRACIIDAE)
- itoi, Japanonoba itoi T. Habe & Y. Ando, 1987 - syn of: Japanonoba patula (A. Adams, 1863) - (VANIKORIDAE)
- itoi, Psephaea kaneko itoi T. Habe, 1965 - (VOLUTIDAE)
- itoigawae, Chlamys itoigawae O. Masuda, 1962 † - (PECTINIDAE) (FOSSIL)
- itoigawai, Zoila itoigawai M. Tomida, 1989 † - (CYPRAEIDAE) (FOSSIL)
- Itomelania, Genus Itomelania Suzuki, 1943 † (CAENOGASTROPODA (UNASSIGNED)) (FOSSIL)
- itonis, Nipponochloritis itonis (J.T. Kuroda, 1953) - (CAMAENIDAE)
- itonis, Chamalycaeus itonis J.T. Kuroda, 1943 - (CYCLOPHORIDAE)
- itonis, Liostomia itonis J.T. Kuroda, 1967 - (PYRAMIDELLIDAE)
- itonis, Daphnella itonis A.V. Sysoev & P. Bouchet, 2001 - (RAPHITOMIDAE)
- itonis nakashimai, Chamalycaeus itonis nakashimai H. Minato, 1987 - (CYCLOPHORIDAE)
- itonis shiotai, Chamalycaeus itonis shiotai H. Minato & K. Yano, 1988 - (CYCLOPHORIDAE)
- Itruvia, Genus Itruvia Stoliczka, 1867 † (OPISTHOBRANCHIA (UNASSIGNED)) (FOSSIL)
- Ittibittium, Genus Ittibittium R.S. Houbrick, 1993 (CERITHIIDAE)
- ituriensis, Verrucarion ituriensis G.A. de Mol, 1970 - (UROCYCLIDAE)
- ituriensis, Trochozonites trifilaris ituriensis H.A. Pilsbry, 1919 - (UROCYCLIDAE)
- iturupensis, Anisus iturupensis L.A. Prozorova & Y.I. Starobogatov, 1997 - (PLANORBIDAE)
- iturupensis, Sarepta iturupensis (Savizky, 1972 †) - (SAREPTIDAE) (FOSSIL)
- iturupensis, Kurilipisidium iturupensis L.A. Prozorova, 1996 - syn of: Pisidium conventus S. Clessin, 1877 - (SPHAERIIDAE)
- iturupensis, Cincinna iturupensis L.A. Prozorova, 1998 - (VALVATIDAE)
- iturupi, Calliloncha iturupi V.J. Lus, 1983 - (BUCCINIDAE)
- iturupica, Cardiomya iturupica O.A. Scarlato, 1972 - (CUSPIDARIIDAE)
- iturupica, Lymnaea iturupica N.D. Kruglov & Y.I. Starobogatov, 1989 - (LYMNAEIDAE)
- iturupica, Kunashiria iturupica V.V. Bogatov & al., 1999 - syn of: Sinanodonta woodiana (I. Lea, 1834) - (UNIONIDAE)
- iturupus, Retifusus iturupus (A.N. Golikov & B.I. Sirenko, 1998) - (BUCCINIDAE)
- iturupus, Mohnia iturupus A.N. Golikov & B.I. Sirenko, 1998 - syn of: Retifusus iturupus (A.N. Golikov & B.I. Sirenko, 1998) - (BUCCINIDAE)
- Itwebeoceras, syn of: Genus Reesidites Wright & Matsumoto, 1954 † (COLLIGNONICERATIDAE) (FOSSIL)
- itylus, Dictyotomaria itylus (A.H. Clarke, 1904 †) - (GOSSELETINIDAE) (FOSSIL)
- itylus, Pleurotomaria itylus A.H. Clarke, 1904 † - syn of: Dictyotomaria itylus (A.H. Clarke, 1904 †) - (PLEUROTOMARIIDAE) (FOSSIL)
- itys, Euryzone itys (J.W. Hall, 1876 †) - (GOSSELETINIDAE) (FOSSIL)
- itys, Pleurotomaria itys J.W. Hall, 1876 † - syn of: Euryzone itys (J.W. Hall, 1876 †) - (PLEUROTOMARIIDAE) (FOSSIL)
- Itzamna, Genus Itzamna H.A. Pilsbry, 1926 (THYSANOPHORIDAE)
- itzamnai, Hesperisternia itzamnai G.T. Watters, 2009 - (BUCCINIDAE)
- iucunda, Horologica iucunda A. Cecalupo & I. Perugia, 2013 - (CERITHIOPSIDAE)
- iucundum, Endoceras iucundum Stumbur, 1956 † - syn of: Cameroceras regulus K.E.I. von Eichwald, 1860 † - (ENDOCERATIDAE) (FOSSIL)
- iudithae, Cerithiopsis iudithae A. Reitano & G. Buzzurro, 2006 - (CERITHIOPSIDAE)
- iuga, Chrysallida iuga (C.F. Laseron, 1959) - (PYRAMIDELLIDAE)
- iugula, Doto iugula J.A. Ortea, 2001 - (DOTIDAE)
- iuloidea, Gyrocochlea iuloidea (E. Forbes, 1851) - (CHAROPIDAE)
- iunior, Amphidromus iunior D.P. Cilia, 2013 - (CAMAENIDAE)
- iunoniae, Crisilla iunoniae (S. Palazzi, 1988) - (RISSOIDAE)
- iuppiterale, Vexillum iuppiterale S.I. Huang, 2017 - (COSTELLARIIDAE)
- iusta, Eulimella iusta Moreno, A. Peñas & E. Rolán, 2003 † - (PYRAMIDELLIDAE) (FOSSIL)
- iutsui, Cypraeovula iutsui (T. Shikama, 1974) - (CYPRAEIDAE)
- iutsui, Cypraea iutsui T. Shikama, 1974 - syn of: Cypraeovula iutsui (T. Shikama, 1974) - (CYPRAEIDAE)
- iutsui atlantica, Cypraeovula iutsui atlantica (L. Raybaudi Massilia, 1988) - (CYPRAEIDAE)
- iutsui levissima, Cypraeovula iutsui levissima L. Raybaudi Massilia, 1995 - (CYPRAEIDAE)
- iutsuina, Cypraeovula amphithales iutsuina L. Raybaudi Massilia, 1995 - (CYPRAEIDAE)
- iutusi, Cypraeovula iutusi T. Shikama, 1974 - syn of: Cypraeovula iutsui (T. Shikama, 1974) - (CYPRAEIDAE)
- iuxtafuniculata, Cerithiopsis iuxtafuniculata (E. Rolán, J. Espinosa & R. Fernández-Garcés, 2007) - (CERITHIOPSIDAE)
- iuxtafuniculata, Nanopsis iuxtafuniculata E. Rolán, J. Espinosa & R. Fernández-Garcés, 2007 - syn of: Cerithiopsis iuxtafuniculata (E. Rolán, J. Espinosa & R. Fernández-Garcés, 2007) - (CERITHIOPSIDAE)
- Ivadella, Genus Ivadella W.H. Dall & P. Bartsch, 1909 (PYRAMIDELLIDAE)
- Ivaldiceras, Genus Ivaldiceras Delanoy & al., 2010 † (MACROSCAPHITIDAE) (FOSSIL)
- ivani, Cerithium ivani A. Cecalupo, 2008 - (CERITHIIDAE)
- ivani, Eoacmaea ivani (J.M.J. Christiaens, 1975) - (EOACMAEIDAE)
- ivanicsi, Gibbula ivanicsi Š. Brusina, 1855 - syn of: Gibbula adansoni B.C.M. Payraudeau, 1827 - (TROCHIDAE)
- ivanmarrowi, Pusia ivanmarrowi Marrow, 2017 - (COSTELLARIIDAE)
- ivanmarrowi, Scabricola ivanmarrowi M.P. Marrow, 2016 - (MITRIDAE)
- ivanovae, Policordia ivanovae J. Poutiers & F.R. Bernard, 1995 - (VERTICORDIIDAE)
- ivanovi, Epirhabdoides ivanovi G. Steiner, 1999 - (ANULIDENTALIIDAE)
- ivanovi, Celekenia ivanovi N.I. Andrusov, 1902 † - (BITHYNIIDAE) (FOSSIL)
- ivanovi, Lussivolutopsius ivanovi Y.I. Kantor, 1983 - (BUCCINIDAE)
- ivanovi, Abyssotrophon ivanovi R.V. Egorov, 1993 - (MURICIDAE)
- ivanovi, Vertorhizoceras ivanovi P.A. Zhuravleva, 1972 † - (NAUTILIDA (UNASSIGNED)) (FOSSIL)
- ivanovi, Orthonychia ivanovi Mazaev, 1996 † - (ORTHONYCHIIDAE) (FOSSIL)
- ivanovi, Sepia ivanovi D.N. Khromov, 1982 - (SEPIIDAE)
- ivantischini, Crenomytilus ivantischini L. Krishtofovich, 1969 † - (MYTILIDAE) (FOSSIL)
- Ivara, Subgenus Odostomia (Ivara) W.H. Dall & P. Bartsch, 1903 (PYRAMIDELLIDAE)
- ivea, Chemnitzia ivea W. Stimpson, 1851 † - (PYRAMIDELLIDAE) (FOSSIL)
- ivensi, Achatina ivensi F. d'A. Furtado, 1886 - syn of: Achatina pfeifferi R.W. Dunker, 1845 - (ACHATINIDAE)
- Iverakia, Genus Iverakia Glöer & Pešic, 2014 (HYDROBIIDAE)
- iversoni, Humboldtiana iversoni F.G. Thompson, 2006 - (HUMBOLDTIANIDAE)
- ivic, Volvarina ivic G.M. Caballer, J. Espinosa & J.A. Ortea, 2009 - (MARGINELLIDAE)
- Ividella, Genus Ividella Dall & Bartsch, 1909 (PYRAMIDELLIDAE)
- Ividia, syn of: Genus Chrysallida P.P. Carpenter, 1857 (PYRAMIDELLIDAE)
- Ivoechiton, Genus Ivoechiton Bergenhayn , 1955 † (GOTLANDOCHITONIDAE) (FOSSIL)
- ivogoensis, Tropidophora ivogoensis E. Fischer-Piette, Ch.P. Blanc & D. Vukadinovic, 1974 - (POMATIIDAE)
- ivohibei, Ampelita ivohibei K.C. Emberton, 1999 - (ACAVIDAE)
- Ivoites, Genus Ivoites De Baets & al., 2009 † (MIMOSPHINCTIDAE) (FOSSIL)
- ivojardai, Harpa major ivojardai T. Cossignani, 2013 - (HARPIDAE)
- ivrivensis, Ostrea ivrivensis Devjatilova, 1981 † - syn of: Crassostrea makarovi L. Krishtofovich, 1964 † - (OSTREIDAE) (FOSSIL)
- ivrivinensis, Limatula ivrivinensis Devjatilova, 1981 † - syn of: Limatula pilvoensis Lautenschläger, 1964 † - (LIMIDAE) (FOSSIL)
- iwadensis, Euhadra decorata iwadensis G. Toba & J.T. Kuroda, 1936 - (BRADYBAENIDAE)
- iwaensis, Ancillina iwaensis F.S. MacNeil, 1960 † - (ANCILLARIIDAE) (FOSSIL)
- iwaensis, Coralliophila iwaensis F.S. MacNeil, 1960 † - (MURICIDAE) (FOSSIL)
- iwaensis, Leucosyrinx iwaensis F.S. MacNeil, 1960 † - (PSEUDOMELATOMIDAE) (FOSSIL)
- iwaiense, Dieneroceras iwaiense A. Hyatt & Smith, 1905 † - syn of: Dieneroceras dieneri (A. Hyatt & Smith, 1905 †) - (COLUMBITIDAE) (FOSSIL)
- iwaiense, Ophiceras iwaiense Sakagami, 1955 † - syn of: Dieneroceras dieneri (A. Hyatt & Smith, 1905 †) - (DIENEROCERATIDAE) (FOSSIL)
- iwaizakiense, Stacheoceras iwaizakiense Mabuti, 1935 † - (NEOSTACHEOCERATIDAE) (FOSSIL)
- iwakawa, Gulella iwakawa H.A. Pilsbry, 1900 - (STREPTAXIDAE)
- iwakawa, Cipangopaludina japonica iwakawa (H.A. Pilsbry, 1902) - (VIVIPARIDAE)
- iwakawa yakushimae, Gulella iwakawa yakushimae H.A. Pilsbry, 1901 - (STREPTAXIDAE)
- iwakawai, Anodonta iwakawai M. Suzuki, 1939 - syn of: Anemina arcaeformis (P.M. Heude, 1877) - (UNIONIDAE)
- iwakawai, Dosinia iwakawai K. Oyama & T. Habe, 1971 - (VENERIDAE)
- Iwakawatrochus, Subgenus Cantharidus (Iwakawatrochus) J.T. Kuroda & T. Habe, 1954 (TROCHIDAE)
- iwakiana, Leochlamys iwakiana Yokoyama, 1925 † - (PECTINIDAE) (FOSSIL)
- Iwakiella, Genus Iwakiella Hatai, Kotaka & Noda, 1972 † (TENTACULITA (UNASSIGNED)) (FOSSIL)
- iwakiense, Nemocardium iwakiense J. Makiyama, 1934 † - (CARDIIDAE) (FOSSIL)
- iwamotoi, Calliostoma iwamotoi N. Ikebe, 1942 - (CALLIOSTOMATIDAE)
- iwamurensis, Chlamys iwamurensis Itoigawa, 1955 † - (PECTINIDAE) (FOSSIL)
- Iwaoa, Genus Iwaoa J.T. Kuroda, 1953 (HORAICLAVIDAE)
- iwaotakii, Calliostoma iwaotakii (M. Azuma, 1961) - (CALLIOSTOMATIDAE)
- iwaotakii, Nipponaphera iwaotakii T. Habe, 1961 - (CANCELLARIIDAE)
- iwaotakii, Amaea iwaotakii M. Azuma, 1961 - (EPITONIIDAE)
- iwaotakii, Divarilima iwaotakii (T. Habe, 1961) - (LIMIDAE)
- iwaotakii, Adipicola iwaotakii (T. Habe, 1958) - (MYTILIDAE)
- iwaotakii, Gyraulus iwaotakii A. Mori, 1938 - (PLANORBIDAE)
- iwaotakii, Monophorus iwaotakii (S. Kosuge, 1963) - (TRIPHORIDAE)
- iwasai, Aglaja iwasai Y. Hirase, 1936 - (AGLAJIDAE)
- iwasiroense, Clinocardium iwasiroense S. Nomura, 1943 † - (CARDIIDAE) (FOSSIL)
- iwateana, Mohnia iwateana R. Tiba, 1981 - (BUCCINIDAE)
- iwatense, Ciliatocardium iwatense (K. Chinzei, 1959 †) - (CARDIIDAE) (FOSSIL)
- iwatensis, Nipponochloritis oscitans iwatensis E. Sorita, 1986 - (CAMAENIDAE)
- iwatensis, Coelomactra iwatensis (Hatai 1940) † - (MACTRIDAE) (FOSSIL)
- iwriensis, Chlamys iwriensis V.N. Sinelnikova, 1990 † - (PECTINIDAE) (FOSSIL)
- ix, Styloptyx fornax ix F.G. Thompson, 1971 - (UROCOPTIDAE)
- Ixartia, syn of: Genus Thracia W.E. Leach in H.M.D. De Blainville, 1824 (THRACIIDAE)
- Ixartia, syn of: Genus Thracia W.E. Leach in H.M.D. De Blainville, 1824 (THRACIIDAE)
- ixchel, Conasprella ixchel (E.J. Petuch, D.P. Berschauer & Poremski, 2017) - (CONIDAE)
- ixchelae, Volvarina ixchelae J. Espinosa & J.A. Ortea, 2015 - (MARGINELLIDAE)
- ixion, Conus ixion A.V.M.D. D'Orbigny, 1852 † - (CONIDAE) (FOSSIL)
- iynx, Naplesites iynx (A.H. Clarke, 1898 †) - (BELOCERATIDAE) (FOSSIL)
- iyoense, Musculium iyoense Y. Hirase - (SPHAERIIDAE)
- iyoensis, Hemiphaedusa iyoensis (H. Minato & Toda, 1977) - (CLAUSILIIDAE)
- iyoensis, Lepidozona iyoensis (Is. Taki & Is. Taki, 1929) - (ISCHNOCHITONIDAE)
- izabal, Cochliopina izabal (H.A. Pilsbry, 1920) - (COCHLIOPIDAE)
- izabal perstriata, Cochliopa izabal perstriata H.A. Pilsbry, 1920 - syn of: Cochliopina izabal (H.A. Pilsbry, 1920) - (COCHLIOPIDAE)
- izabellae, Eucycloscala izabellae A. Kaim, 2004 † - (EUCYCLOSCALIDAE) (FOSSIL)
- izabellina, Laeviglandina izabellina (L. Pfeiffer, 1846) - (SPIRAXIDAE)
- izardi, Tropites izardi Tozer, 1994 † - (TROPITIDAE) (FOSSIL)
- izekiana, Argyropeza izekiana J.T. Kuroda, 1949 - (CERITHIIDAE)
- izozoensis, Bostryx izozoensis J.J. Parodíz, 1947 - (BULIMULIDAE)
- izuensis, Wallucina izuensis T.A. Okutani & A. Matsukuma, 1982 - (LUCINIDAE)
- izuensis, Decatopecten izuensis (Nomura & Niino) † - (PECTINIDAE) (FOSSIL)
- izumensis, Multidentata izumensis (Ichikawa & Maeda 1958) † - (NUCULANIDAE) (FOSSIL)
- Izumia, Genus Izumia Ichikawa in Ichikawa & Maeda, 1963 † (ARCTICIDAE) (FOSSIL)
- Izumicardia, Genus Izumicardia Ichikawa, 1963 † (CARDITIDAE) (FOSSIL)
- izumiense, Gaudryceras izumiense E. Matsumoto & Morozumi, 1981 † - (GAUDRYCERATIDAE) (FOSSIL)
- izumoensis, Eutrephoceras izumoensis Yokoyama, 1913 † - (NAUTILIDAE) (FOSSIL)
- izumoensis, Cultellus izumoensis Yokoyama, 1923 † - (PHARIDAE) (FOSSIL)
- Izumonauta, Genus Izumonauta Kobayashi, 1954 † (ARGONAUTIDAE) (FOSSIL)
- izumonis, Euhadra izumonis (H.A. Pilsbry & J.T. Gulick, 1900) - (BRADYBAENIDAE)
- izurense, Gloripallium izurense Masuda 1958 † - (PECTINIDAE) (FOSSIL)
- izurensis, Macoma izurensis Yokoyama † - (TELLINIDAE) (FOSSIL)
- izushichitojimana, Nipponochlamys izushichitojimana (H.A. Pilsbry & Y. Hirase, 1904) - (HELICARIONIDAE)
- izushichtoensis, Trochochlamys praealta izushichtoensis (H.A. Pilsbry & Y. Hirase, 1903) - (HELICARIONIDAE)
- izushotoensis, Nucula izushotoensis (T.A. Okutani, 1966) - (NUCULIDAE)
- izvorica, Bythinella izvorica P. Glöer & D.G. Georgiev, 2011 - (BYTHINELLIDAE)
- izzatullaevi, Cochlicopa izzatullaevi Y.I. Starobogatov, 1996 - (COCHLICOPIDAE)
- izzatullaevi, Pseudonapaeus izzatullaevi A.G. Kuznetsov, 1999 - (ENIDAE)
- izzatullaevi, Levanderiella izzatullaevi (I.M. Likharev & A. Wiktor, 1980) - (PARMACELLIDAE)
- izzatullaevi, Euglesa izzatullaevi F. Zatrawkin, 1987 - syn of: Pisidium lilljeborgi S. Clessin, 1886 - (SPHAERIIDAE)
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