- iacobaeus waikikius, Pecten iacobaeus waikikius W.H. Dall, P. Bartsch & H.A. Rehder, 1938 - syn of: Pecten waikikius W.H. Dall, P. Bartsch & H.A. Rehder, 1938 - (PECTINIDAE)
- iacobinica, Latouchella iacobinica D. Geyer, 1986 † - syn of: Idiohamites dorsetensis Spath, 1926 † - (COREOSPIRIDAE) (FOSSIL)
- iacobinica, Igorella iacobinica D. Geyer, 1986 † - (HELCIONELLIDAE) (FOSSIL)
- iacosta, Cathaica iacosta O.F. von Möllendorff, 1899 - syn of: Cathaica cavimargo (E.C. Von Martens, 1879) - (BRADYBAENIDAE)
- Iacra, Genus Iacra H. Adams & A. Adams, 1856 (SEMELIDAE)
- iacula, Hypselodoris iacula T.M. Gosliner & R.F. Johnson, 1999 - (CHROMODORIDIDAE)
- iadola, Monacha iadola J.R. Bourguignat in É.A.A. Locard, 1882 - syn of: Eutheba cantiana (G. Montagu, 1803) - (HYGROMIIDAE)
- iae, Xerosecta iae (P.M. Pallary, 1896) - (HYGROMIIDAE)
- iaeviusculum, Hoplocrioceras iaeviusculum (A. von Koenen, 1902 †) - (ACRIOCERATIDAE) (FOSSIL)
- iaira, Linguella iaira (L.S.R. Bergh, 1865, 1864) - (ARMINIDAE)
- Ianacus, syn of: Genus Crepidula J.B.P.A. Lamarck, 1799 (CALYPTRAEIDAE)
- Ianacus, syn of: Genus Crepidula J.B.P.A. Lamarck, 1799 (CALYPTRAEIDAE)
- ianlochi, Murexsul ianlochi (R. Houart, 1987) - (MURICIDAE)
- ianninii, Limax ianninii F.L. Giusti, 1973 - (LIMACIDAE)
- iansa, Conasprella iansa (E.J. Petuch, 1979) - (CONIDAE)
- iansa, Coltroconus iansa (E.J. Petuch, 1979) - syn of: Conasprella iansa (E.J. Petuch, 1979) - (CONIDAE)
- ianthe, Kylix ianthe (W.H. Dall, 1919) - (DRILLIIDAE)
- ianthe, Pseudamnicola ianthe C. Radea & A. Parmakelis, 2016 - (HYDROBIIDAE)
- ianthina, Strophiops ianthina (C.J. Maynard, 1889) - (CERIONIDAE)
- ianthina, Pteraeolidia ianthina (G.F. Angas, 1864) - (FACELINIDAE)
- ianthina, Janthina ianthina J.H.F. Link, 1807 - syn of: Janthina janthina (C. Linnaeus, 1758) - (JANTHINIDAE)
- Ianthina, syn of: Genus Janthina P.F. Röding, 1798 (JANTHINIDAE)
- Ianthinopsis, Genus Ianthinopsis Meek & Worthen, 1866 † (SOLENISCIDAE) (FOSSIL)
- ianthinum, Cerithium ianthinum A.A. Gould, 1849 - (CERITHIIDAE)
- ianthinus, Joculator ianthinus A. Cecalupo & I. Perugia, 2013 - (CERITHIOPSIDAE)
- ianthostoma, Littoraria ianthostoma R.L. Stuckey & D.G. Reid, 2002 - (LITTORINIDAE)
- ianusi, Prunum ianusi J. Espinosa & J.A. Ortea, 2015 - (MARGINELLIDAE)
- Iapetocardia, Genus Iapetocardia Rogalla & Amler, 2006 † (PSEUDOBIGALEAIDAE) (FOSSIL)
- iarae, Trophon iarae R. Houart, 1998 - (MURICIDAE)
- iarkini, Pecchiolia iarkini Meszaros, 1957 † - (VERTICORDIIDAE) (FOSSIL)
- Iaronia, syn of: Genus Caelatura T.A. Conrad, 1865 (BARLEEIIDAE)
- Iaton, syn of: Genus Jaton G.G. Pusch, 1837 (MURICIDAE)
- iatricus, Chiton iatricus R. Winckworth, 1930 - syn of: Chiton peregrinus K.H.J. Thiele, 1909 - (CHITONIDAE)
- iatriensis, Pavlovia iatriensis (Ilovaisky, 1917 †) - (DORSOPLANITIDAE) (FOSSIL)
- iaxa, Stenomelania iaxa (A. Mousson) - (THIARIDAE)
- iba, Montenegrina laxa iba H. Nordsieck - (CLAUSILIIDAE)
- ibanezi, Leptochiton ibanezi Sirenko & Sellanes, 2016 - (LEPTOCHITONIDAE)
- ibaraoensis, Helicophanta ibaraoensis (G.F. Angas, 1879) - (ACAVIDAE)
- ibarensis, Herilla bosniensis ibarensis (A.J. Wagner, 1919) - (CLAUSILIIDAE)
- ibari, Glycymeris ibari R.A. Philippi, 1887 † - (GLYCYMERIDIDAE) (FOSSIL)
- ibari, Panopea ibari R.A. Philippi, 1887 † - (HIATELLIDAE) (FOSSIL)
- ibariformis, Glycymerita ibariformis D. Frassinetti & Covacevich, 1983 † - (GLYCYMERIDIDAE) (FOSSIL)
- ibarrae, Volvarina ibarrae J. Espinosa & J.A. Ortea, 1998 - (MARGINELLIDAE)
- ibarrae, Chondrothyra uniplicata ibarrae M.L. Jaume, 1984 - (POMATIIDAE)
- ibazoricum, Carychium ibazoricum R.A. Bank & E. Gittenberger, 1985 - (ELLOBIIDAE)
- ibbetson, Rostrocorbula ibbetson (Morris 1853) † - (CORBULIDAE) (FOSSIL)
- ibbetsoni, Proconulus ibbetsoni (Morris & J. Lycett, 1851 †) - (PROCONULIDAE) (FOSSIL)
- ibbetsoni weldonis, Proconulus ibbetsoni weldonis (Hudleston †) - (PROCONULIDAE) (FOSSIL)
- ibera, Caucasocressa ibera B. Hausdorf, 2003 - (HYGROMIIDAE)
- ibera, Parmacella ibera (K.E.I. von Eichwald, 1841) - (PARMACELLIDAE)
- Iberellus, Subgenus Allognathus (Iberellus) P. Hesse, 1908 (HELICIDAE)
- ibergense, Conocardium ibergense Beushausen, 1895 † - syn of: Babinicardia ibergense (Beushausen, 1895 †) - (CONOCARDIIDAE) (FOSSIL)
- ibergense, Babinicardia ibergense (Beushausen, 1895 †) - (HIPPOCARDIIDAE) (FOSSIL)
- Ibergia, Genus Ibergia Blodgett & Frýda, 1999 † (GOSSELETINIDAE) (FOSSIL)
- Iberhoratia, Genus Iberhoratia B. Arconada & M.A. Ramos, 2007 (HYDROBIIDAE)
- iberia, Ticocystiscus iberia J. Espinosa & J.A. Ortea, 2002 - (CYSTISCIDAE)
- iberica, Aldanella iberica Gubanov & al., 2004 † - (ALDANELLIDAE) (FOSSIL)
- iberica, Amalda iberica B.M. Landau & F. Da Silva, 2006 † - (ANCILLARIIDAE) (FOSSIL)
- iberica, Borsonia iberica (M. Rouault, 1849 †) - (BORSONIIDAE) (FOSSIL)
- iberica, Odonteuxina iberica (J.R. Roth in M. Wagner, 1850) - (CLAUSILIIDAE)
- iberica, Hydrobia iberica P. Jodot, 1953 - (HYDROBIIDAE)
- iberica, Helicella iberica (J.P. Rambur, 1869) - (HYGROMIIDAE)
- iberica, Lepidochitona iberica P. Kaas & R.A. Van Belle, 1981 - (LEPIDOCHITONIDAE)
- iberica, Granulina iberica R. La Perna, B.M. Landau & R. Marquet, 2001 † - (MARGINELLIDAE) (FOSSIL)
- iberica, Pseudosimnia adriatica iberica C.N. Cate, 1973 - (OVULIDAE)
- iberica, Limacia iberica G.M. Caballer, Almón & J. Pérez, 2016 - (POLYCERIDAE)
- iberica, Meekia iberica Saul & W.P. Popenoe, 1962 † - (TANCREDIIDAE) (FOSSIL)
- ibericola, Nennapteria ibericola Kriz 2005 † - (PTERINEIDAE) (FOSSIL)
- ibericum, Tympanoceras ibericum Kullmann, 1962 † - (CRAVENOCERATIDAE) (FOSSIL)
- ibericum, Karsteniceras ibericum Vasicek & Wiedemann, 1994 † - syn of: Karsteniceras beyrichii (D.L.G. Karsten, 1858 †) - (LEPTOCERATOIDIDAE) (FOSSIL)
- ibericum, Paracymatoceras ibericum Tintant † - (NAUTILIDAE) (FOSSIL)
- ibericum, Pisidium ibericum S. Clessin, 1873 - syn of: Pisidium casertanum (Poli, 1791) - (SPHAERIIDAE)
- ibericus, Hexaplex trunculus ibericus (F. Settepassi, 1969) - (MURICIDAE)
- ibericus, Unio mancus ibericus C.R. Altaba, 1992 - (UNIONIDAE)
- Iberites, Genus Iberites Hyatt, 1900 † (HUNGARITIDAE) (FOSSIL)
- iberoclathratus, Nassarius iberoclathratus B.M. Landau, F. Da Silva & C. Gili, 2009 † - (NASSARIIDAE) (FOSSIL)
- iberogallicum, Prochaetoderma iberogallicum L. Salvini-Plawén, 1999 - (PROCHAETODERMATIDAE)
- iberogermanicus, Conus iberogermanicus D. Röckel, E. Rolán & A. Monteiro, 1980 - syn of: Africonus irregularis (G.B. II Sowerby, 1858) - (CONIDAE)
- iberopyrenaica, Alzoniella iberopyrenaica B. Arconada, E. Rolán & H.D. Boeters, 2007 - (HYDROBIIDAE)
- Iberus, Genus Iberus P.D. Montfort, 1810 (HELICIDAE)
- ibex, Metalycaeus ibex Páll-Gergely & Hunyadi, 2017 - (CYCLOPHORIDAE)
- ibex, Tragophylloceras ibex (F.A. von Quenstedt, 1843 †) - (JURAPHYLLITIDAE) (FOSSIL)
- ibex, Sibirites ibex L. Waagen, 1895 † - syn of: Anasibirites angulosus (L. Waagen, 1895 †) - (SIBIRITIDAE) (FOSSIL)
- ibex, Strobiligera ibex (W.H. Dall, 1881) - (TRIPHORIDAE)
- ibex, Triphora ibex W.H. Dall, 1881 - syn of: Strobiligera ibex (W.H. Dall, 1881) - (TRIPHORIDAE)
- ibexense, Kiotoceras ibexense Flower, 1976 † - (ENDOCERATIDAE) (FOSSIL)
- ibexense, Catoraphiceras ibexense Hook & Flower, 1977 † - (PROTOCYCLOCERATIDAE) (FOSSIL)
- ibitingus, Microlinices ibitingus L.R.L. Simone, 2014 - (NATICIDAE)
- ibizenca, Parvioris ibizenca (F. Nordsieck, 1968) - (EULIMIDAE)
- ibizenca, Gibbula ibizenca F. Nordsieck, 1982 - (TROCHIDAE)
- ibizense, Binelliceras ibizense (Wiedmann, 1962 †) - (CRIOCERATITIDAE) (FOSSIL)
- ibnishaqi, Mimimitoceras ibnishaqi W. Korn, Bockwinkel & Ebbighausen, 2015 † - (PRIONOCERATIDAE) (FOSSIL)
- ibnrushdi, Czarnoclymenia ibnrushdi W. Korn, 1999 † - (PLATYCLYMENIIDAE) (FOSSIL)
- ibnsinai, Platyclymenia ibnsinai W. Korn, 1999 † - (PLATYCLYMENIIDAE) (FOSSIL)
- ibntufayli, Sellaclymenia ibntufayli (W. Korn, 1999 †) - (SELLACLYMENIIDAE) (FOSSIL)
- ibo, Gyaloceras ibo Reyment, 1955 † - (OPPELIIDAE) (FOSSIL)
- Ibotrigonia, Genus Ibotrigonia Kobayashi in Kobayashi & Tamura, 1957 † (MYOPHORELLIDAE) (FOSSIL)
- ibrahimi, Gisortia ibrahimi Abbass, 1967 † - (CYPRAEIDAE) (FOSSIL)
- ibukicola, Euhadra senckenbergiana ibukicola H.A. Pilsbry, 1928 - (BRADYBAENIDAE)
- iburica, Corbula iburica M. Yokoyama, 1932 † - (CORBULIDAE) (FOSSIL)
- iburica, Corbicula iburica (M. Yokoyama, 1931 †) - (CYRENIDAE) (FOSSIL)
- Ibycus, Genus Ibycus D.F. Heynemann, 1862 (ARIOPHANTIDAE)
- icaensis, Arginella icaensis Rivera, 1957 † - (NOETIIDAE) (FOSSIL)
- icafra, Curveulima icafra (P. Bartsch, 1915) - (EULIMIDAE)
- icafra, Melanella icafra P. Bartsch, 1915 - syn of: Curveulima icafra (P. Bartsch, 1915) - (EULIMIDAE)
- icafra, Odostomia icafra P. Bartsch, 1915 - (PYRAMIDELLIDAE)
- icana, Anodonta icana É.A.A. Locard, 1890 - syn of: Anodonta cygnea (C. Linnaeus, 1758) - (UNIONIDAE)
- Icanotia, Genus Icanotia Stoliczka, 1870 † (ICANOTIIDAE) (FOSSIL)
- ICANOTIIDAE Casey, 1961 † - Family (BIVALVIA-HETERODONTA [Subclass]-EUHETERODONTA [Infraclass]-IMPARIDENTIA [Superorder]-VENERIDA [Order]-TELLINOIDEA [Superfamily]) (FOSSIL)
- icarus, Cacozeliana icarus (C.É. Bayle, 1880) - (CERITHIIDAE)
- icarus, Cerithium icarus C.É. Bayle, 1880 - syn of: Cacozeliana icarus (C.É. Bayle, 1880) - (CERITHIIDAE)
- icarus, Otohoplites icarus Casey † - (HOPLITIDAE) (FOSSIL)
- Icarus, syn of: Genus Oxynoe C.S. Rafinesque, 1814 (OXYNOIDAE)
- icarus, Coluzea icarus M.G. Harasewych, 1986 - (TURBINELLIDAE)
- icaunensis, Actaeonina icaunensis Cotteau † - syn of: Liocarenus gymna (A.E.M. Cossmann, 1918 †) - (ACTEONINIDAE) (FOSSIL)
- icaunensis, Harpagodes icaunensis (Cotteau, 1854 †) - (HARPAGODIDAE) (FOSSIL)
- icela, Turbonilla icela J.C. Melvill, 1910 - (PYRAMIDELLIDAE)
- icelum, Neostylidium eschrichtii icelum (P. Bartsch, 1907) - (CERITHIIDAE)
- iceniae, Turbitrigonia iceniae D.P. Kelly, 1984 † - (MYOPHORELLIDAE) (FOSSIL)
- icenorum, Asthenotoma icenorum (Wood, 1877 †) - (BORSONIIDAE) (FOSSIL)
- icenorum, Drillia icenorum Harmer, 1915 † - (DRILLIIDAE) (FOSSIL)
- icenorum, Pleurotoma icenorum Wood, 1877 † - syn of: Asthenotoma icenorum (Wood, 1877 †) - (TURRIDAE) (FOSSIL)
- ichikawai, Nuculites ichikawai Nakazawa & Newell, 1968 † - (MALLETIIDAE) (FOSSIL)
- ichikawensis, Eufenella ichikawensis M. Yokoyama, 1927 † - syn of: Finella pupoides A. Adams, 1860 - (DIASTOMATIDAE) (FOSSIL)
- ichikawensis, Rissoa ichikawensis M. Yokoyama, 1927 † - syn of: Finella pupoides A. Adams, 1860 - (RISSOIDAE) (FOSSIL)
- ichinoseana, Fusiconus ichinoseana (J.T. Kuroda, 1956) - (CONIDAE)
- ichinoseana prioris, Asprella ichinoseana prioris J.T. Kuroda, 1956 - syn of: Fusiconus ichinoseana (J.T. Kuroda, 1956) - (CONIDAE)
- ichnoides, Hipparionoceras ichnoides Flower, 1945 † - (POLYELASMOCERATIDAE) (FOSSIL)
- Ichnusa, syn of: Genus Bela J.E. Gray, 1847 (MANGELIIDAE)
- ichnusae, Milax ichnusae M. Lessona & C. Pollonera, 1882 - syn of: Milax nigricans (R.A. Philippi, 1836) - (MILACIDAE)
- Ichnusarion, syn of: Genus Ariunculus R.P. Lesson, 1881 (ARIONIDAE)
- Ichnusomunda, Genus Ichnusomunda F.L. Giusti & G. Manganelli, 1990 (HYGROMIIDAE)
- Ichnusotricha, Genus Ichnusotricha F.L. Giusti & G. Manganelli, 1987 (HYGROMIIDAE)
- ichthyandri, Daphnella ichthyandri A.V. Sysoev & D.L. Ivanov, 1985 - (RAPHITOMIDAE)
- ichthyodes, Ichthyomenia ichthyodes (G.F. Pruvot, 1890) - (DONDERSIIDAE)
- ichthyodes, Dondersia ichthyodes G.F. Pruvot, 1890 - syn of: Ichthyomenia ichthyodes (G.F. Pruvot, 1890) - (DONDERSIIDAE)
- ichthyodes, Ismenia ichthyodes G.F. Pruvot, 1891 - syn of: Ichthyomenia ichthyodes (G.F. Pruvot, 1890) - (DONDERSIIDAE)
- Ichthyomenia, Genus Ichthyomenia H.A. Pilsbry, 1898 (DONDERSIIDAE)
- Ichthyosarcolites, Genus Ichthyosarcolites Desmarest, 1817 † (ICHTHYOSARCOLITIDAE) (FOSSIL)
- ICHTHYOSARCOLITIDAE Douvillé, 1887 † - Family (BIVALVIA-HETERODONTA [Subclass]-EUHETERODONTA [Infraclass]-HIPPURITIDA [Order]-CAPRINOIDEA [Superfamily]) (FOSSIL)
- ichthys, Pseudorhaphitoma ichthys (J.C. Melvill, 1910) - (MANGELIIDAE)
- ichtyomma, Helix ichtyomma F. Held, 1857 - syn of: Chilostoma achates E.A. Rossmässler, 1835 - (HELICIDAE)
- Ichythomenia, syn of: Genus Heathia K.H.J. Thiele, 1913 (DONDERSIIDAE)
- ickeae, Canarium ickeae C. Beets, 1987 † - (STROMBIDAE) (FOSSIL)
- ickei, Megatylotus ickei (K. Martin, 1914 †) - (AMPULLINIDAE) (FOSSIL)
- ickei, Ancilla ickei K. Martin, 1914 † - (ANCILLARIIDAE) (FOSSIL)
- ickei, Rhinoclavis ickei (M.M. Schepman, 1906) - (CERITHIIDAE)
- ickei, Clypeomorus ickei K. Martin, 1914 - syn of: Cerithium coralium (L.C. Kiener, 1841) - (CERITHIIDAE)
- ickei, Cerithium ickei L. Vignal, 1908 - syn of: Cerithium munitum G.B. II Sowerby, 1855 - (CERITHIIDAE)
- ickei, Cerithium ickei K. Martin, 1914 - syn of: Cerithium coralium (L.C. Kiener, 1841) - (CERITHIIDAE)
- ickei, Lithoconus ickei Martin, 1906 † - (CONIDAE) (FOSSIL)
- ickei, Bicorbula ickei Martin, 1914 † - (CORBULIDAE) (FOSSIL)
- ickei, Pugilina ickei Martin, 1906 † - (MELONGENIDAE) (FOSSIL)
- ickei, Dientomochilus ickei Martin, 1914 † - (RIMELLIDAE) (FOSSIL)
- ickei, Pleurotoma ickei Martin, 1906 † - (TURRIDAE) (FOSSIL)
- ickei, Lyria ickei (K. Martin, 1906 †) - (VOLUTIDAE) (FOSSIL)
- ickei, Volutilithes ickei K. Martin, 1914 † - syn of: Athleta subambiguus (K. Martin, 1914 †) - (VOLUTIDAE) (FOSSIL)
- icmalea, Xerosecta icmalea P.M. Pallary - (HYGROMIIDAE)
- Icoplax, syn of: Genus Callochiton J.E. Gray, 1847 (CALLOCHITONIDAE)
- icosiphyllus, Trophon icosiphyllus R. Tate, 1888 † - (MURICIDAE) (FOSSIL)
- icosisculpta, Emarginula icosisculpta L.R.L. Simone & C.M. Cunha, 2014 - (FISSURELLIDAE)
- icterica, Archachatina marginata icterica (J.C. Bequaert & W.J. Clench, 1936) - (ACHATINIDAE)
- icterica, Lucina icterica L.A. Reeve, 1850 - syn of: Semele proficua (R. Pulteney, 1799) - (LUCINIDAE)
- icterica, Retinella olivetorum icterica (N. Tiberi, 1872) - (ZONITIDAE)
- ictericus, Mesembrinus depictus ictericus E.C. Von Martens, 1873 - (BULIMULIDAE)
- ictericus, Drymaeus lilacinus ictericus E.C. Von Martens, 1893 - (BULIMULIDAE)
- ictericus, Drymaeus poecilus ictericus (C.M.F. Ancey, 1892) - (BULIMULIDAE)
- ictericus, Spondylus ictericus L.A. Reeve, 1856 - (SPONDYLIDAE)
- icterina, Monetaria moneta icterina (J.B.P.A. Lamarck, 1810) - (CYPRAEIDAE)
- icterina, Elliptio icterina T.A. Conrad, 1834 - (UNIONIDAE)
- icterius, Loripes icterius L.A. Reeve, 1850 - (LUCINIDAE)
- icterostomus, Drymaeus icterostomus (E.C. Von Martens, 1901) - (BULIMULIDAE)
- Icthyosarcolites, syn of: Genus Ichthyosarcolites Desmarest, 1817 † (ICHTHYOSARCOLITIDAE) (FOSSIL)
- Ictis, syn of: Genus Limapontia G. Johnston, 1836 (LIMAPONTIIDAE)
- ictriella, Iravadia ictriella (J.C. Melvill, 1910) - (IRAVADIIDAE)
- ictriella, Rissoa ictriella J.C. Melvill, 1910 - syn of: Iravadia ictriella (J.C. Melvill, 1910) - (RISSOIDAE)
- Icuncula, Genus Icuncula T. Iredale, 1924 (CAPULIDAE)
- Icunculus, syn of: Genus Icuncula T. Iredale, 1924 (CAPULIDAE)
- ida, Columbella ida P.L. Duclos, 1846 - syn of: Parvanachis pygmaea (G.B. I Sowerby, 1832) - (COLUMBELLIDAE)
- ida, Raphitoma ida K.H.J. Thiele, 1925 - syn of: Tritonoturris capensis (E.A. Smith, 1882) - (RAPHITOMIDAE)
- ida, Katherinella ida Tegland, 1928 - syn of: Agriopoma morrhuanum (W.H. Dall, 1902) - (VENERIDAE)
- idae, Tornatellides idae C.M. Cooke & H.A. Pilsbry, 1915 - (ACHATINELLIDAE)
- idae, Partulina rufa idae F. Borcherding, 1901 - (ACHATINELLIDAE)
- idae, Sagenites idae Mojsisovics, 1893 † - syn of: Eusagenites tschermaki (Mojsisovics, 1893 †) - (HALORITIDAE) (FOSSIL)
- idae, Ceratopoma idae (L. Pfeiffer, 1856) - (HELICINIDAE)
- idae, Mitra idae J.C. Melvill, 1893 - (MITRIDAE)
- idae, Atrimitra idae (R.V. Melville, 1893 †) - (MITRIDAE) (FOSSIL)
- idae, Idatellina idae (W.H. Dall, 1891) - (TELLINIDAE)
- idae, Tellinella idae W.H. Dall, 1891 - syn of: Idatellina idae (W.H. Dall, 1891) - (TELLINIDAE)
- idae, Idaoceras idae (Mojsisovics, 1893 †) - (THETIDITIDAE) (FOSSIL)
- idae, Vaginula idae C.G. Semper, 1885 - syn of: Semperula wallacei (A. Issel, 1874) - (VERONICELLIDAE)
- idae anisoplax, Tornatellides idae anisoplax H.A. Pilsbry & C.M. Cooke, 1915 - (ACHATINELLIDAE)
- idaea, Albinaria idaea (L. Pfeiffer, 1862) - (CLAUSILIIDAE)
- idaea, Chlamys idaea L.A. Reeve, 1853 - syn of: Karnekampia sulcata (O.F. Müller, 1776) - (PECTINIDAE)
- idaea amabilis, Albinaria idaea amabilis H. Engelhardt & J.W.F. Slik, 1994 - (CLAUSILIIDAE)
- idaea letoana, Albinaria idaea letoana H. Nordsieck, 2017 - (CLAUSILIIDAE)
- idaea lindneri, Albinaria idaea lindneri H. Nordsieck, 1998 - (CLAUSILIIDAE)
- idaea pichcapunlla, Albinaria idaea pichcapunlla F.W. Welter-Schultes & V. Wiese, 1991 - (CLAUSILIIDAE)
- idaea rolli, Albinaria idaea rolli H. Nordsieck, 1977 - (CLAUSILIIDAE)
- idaea venosa, Albinaria idaea venosa (O. Böttger, 1883) - (CLAUSILIIDAE)
- idaea zeus, Albinaria idaea zeus (L. Pfeiffer, 1850) - (CLAUSILIIDAE)
- Idahocolumbites, Genus Idahocolumbites Guex & al., 2005 † (COLUMBITIDAE) (FOSSIL)
- idahoense, Hellenites idahoense (Smith, 1932 †) - (COLUMBITIDAE) (FOSSIL)
- idahoense, Helisoma anceps idahoense H.B. Baker, 1945 - (PLANORBIDAE)
- idahoense, Pristiloma idahoense H.A. Pilsbry, 1902 - (PRISTILOMATIDAE)
- idahoense, Pisidium idahoense E.W. Roper, 1890 - (SPHAERIIDAE)
- idahoensis, Zacoleus idahoensis H.A. Pilsbry, 1903 - (ARIOLIMACIDAE)
- idahoensis, Stenoconites idahoensis W.J. Gordon, 1966 † - (AULACOCERATIDAE) (FOSSIL)
- idahoensis, Aviculopecten idahoensis F.B. Meek, 1871 † - (AVICULOPECTINIDAE) (FOSSIL)
- idahoensis, Gosseletina idahoensis (Girty, 1910 †) - (GOSSELETINIDAE) (FOSSIL)
- idahoensis, Pyrgulopsis idahoensis H.A. Pilsbry, 1933 - (HYDROBIIDAE)
- idahoensis, Hyolithes idahoensis Resser, 1938 † - syn of: Hyolithes cecrops Walcott, 1917 † - (HYOLITHIDAE) (FOSSIL)
- idahoensis, Brochidiella idahoensis A. Nützel & Erwin, 2001 † - (LIOTIIDAE) (FOSSIL)
- idahoensis, Stagnicola idahoensis J. Henderson, 1931 - (LYMNAEIDAE)
- idahoensis, Oreohelix idahoensis (W. Newcomb, 1866) - (OREOHELICIDAE)
- idahoensis, Pleurotomaria idahoensis Girty, 1910 † - syn of: Gosseletina idahoensis (Girty, 1910 †) - (PLEUROTOMARIIDAE) (FOSSIL)
- idahoensis, Phaedrysmocheilus idahoensis (Kummel, 1953 †) - (TAINOCERATIDAE) (FOSSIL)
- idahoensis, Valvata idahoensis Taylor, 1981 † - (VALVATIDAE) (FOSSIL)
- idahoensis, Vertigo idahoensis H.A. Pilsbry, 1934 - (VERTIGINIDAE)
- Idaholanx, Genus Idaholanx S.A. Clark, S.C. Campbell & Lydeard, 2017 (LYMNAEIDAE)
- Idahospira, Genus Idahospira Nützel & Erwin 2004 † (CAENOGASTROPODA (UNASSIGNED)) (FOSSIL)
- idaleum, Latiaxis idaleum A.C. Bernardi, 1853 - syn of: Mipus gyratus (R.B. Hinds, 1844) - (MURICIDAE)
- idalia, Cardinia idalia A.V.M.D. D'Orbigny, 1850 † - (CARDINIIDAE) (FOSSIL)
- Idalia, syn of: Genus Okenia F.S. Leuckart & H.G. Bronn in K.T. Menke, 1830 (GONIODORIDIDAE)
- Idaliella, syn of: Genus Okenia F.S. Leuckart & H.G. Bronn in K.T. Menke, 1830 (GONIODORIDIDAE)
- idalima, Miralda idalima J.C. Melvill, 1896 - (PYRAMIDELLIDAE)
- idalina, Zafrona idalina (P.L. Duclos, 1840) - (COLUMBELLIDAE)
- Idalina, syn of: Genus Okenia F.S. Leuckart & H.G. Bronn in K.T. Menke, 1830 (GONIODORIDIDAE)
- idalinae, Drillia idalinae F.R. Bernard & K. Nicolay, 1984 - (DRILLIIDAE)
- idalium, Epitonium idalium (J.C. Melvill, 1912) - (EPITONIIDAE)
- idaltu, Homo sapiens idaltu White & al., 2003 † - (Hominidae) (FOSSIL)
- Idamera, syn of: Genus Plectorhagada T. Iredale, 1933 (CAMAENIDAE)
- idanica, Candidula idanica É.A.A. Locard, 1881 - syn of: Candidula gigaxii (L. Pfeiffer, 1850) - (HYGROMIIDAE)
- Idanoceras, Genus Idanoceras Henderson & McKenzie 2002 † (LABECERATIDAE) (FOSSIL)
- Idaoceras, Genus Idaoceras Tozer , 1994 † (THETIDITIDAE) (FOSSIL)
- Idas, Genus Idas T. Iredale, 1939 (MYTILIDAE)
- Idasola, syn of: Genus Idas T. Iredale, 1939 (MYTILIDAE)
- Idatellina, Genus Idatellina M. Huber, Langleit & Kreipl, 2015 (TELLINIDAE)
- iddingsi, Arctica iddingsi Stanton, 1899 - (ARCTICIDAE)
- iddingsi, Cerithium iddingsi A.A. Olsson, 1928 † - (CERITHIIDAE) (FOSSIL)
- iddingsi, Turritella iddingsi A.A. Olsson, 1928 † - (TURRITELLIDAE) (FOSSIL)
- Iddingsia, Genus Iddingsia Olsson, 1929 † (CERITHIIDAE) (FOSSIL)
- ide, Suteria ide (J.E. Gray, 1850) - (CHAROPIDAE)
- idea, Pholadomya idea d'Orbigny, 1850 † - (PHOLADOMYIDAE) (FOSSIL)
- ideliense, Peripetoceras ideliense I.S. Barskov & Shilovsky, 2014 † - (LIROCERATIDAE) (FOSSIL)
- idensis, Glycymeris idensis S. Kanno, 1956 † - (GLYCYMERIDIDAE) (FOSSIL)
- identa, Turritella identa (T.A. Conrad, 1841 †) - (TURRITELLIDAE) (FOSSIL)
- identala, Macoma identala W.H. Dall, 1900 - (TELLINIDAE)
- Idesa, Subgenus Alcadia (Idesa) H. Adams & A. Adams, 1856 (HELICINIDAE)
- idia, Pleurotomaria idia J.W. Hall, 1861 † - syn of: Pleurotomaria zitteli Holzapfel, 1882 † - (PLEUROTOMARIIDAE) (FOSSIL)
- Idiobeloceras, syn of: Genus Beloceras Hyatt , 1884 † (BELOCERATIDAE) (FOSSIL)
- Idiocheila, syn of: Genus Pusia W.J. Swainson, 1840 (COSTELLARIIDAE)
- Idiochila, syn of: Genus Pusia W.J. Swainson, 1840 (COSTELLARIIDAE)
- idiochila, Dentimargo idiochila (J.S. Schwengel, 1943) - (MARGINELLIDAE)
- IDIOCTOPODIDAE - syn of Family: AMPHITRETIDAE
- Idioctopus, syn of: Genus Amphitretus W.E. Hoyle, 1885 (AMPHITRETIDAE)
- Idioctopus, syn of: Genus Amphitretus W.E. Hoyle, 1885 (AMPHITRETIDAE)
- Idiocycloceras, Genus Idiocycloceras Spath, 1928 † (MACROCEPHALITIDAE) (FOSSIL)
- idiogenes, Upsilodon idiogenes H.A. Pilsbry, 1956 - (POLYGYRIDAE)
- Idiohamites, Genus Idiohamites Spath , 1925 † (ANISOCERATIDAE) (FOSSIL)
- Idiomela, Subgenus Helix (Idiomela) T.D.A. Cockerell, 1921 (HELICIDAE)
- idiomorpha, Lienardia idiomorpha (R.P.J. Hervier, 1897) - (CLATHURELLIDAE)
- idiopoma, Natica idiopoma H.A. Pilsbry & H.N. Lowe, 1932 - (NATICIDAE)
- Idiopoma, Genus Idiopoma H.A. Pilsbry, 1901 (VIVIPARIDAE)
- idioptyx, Zaptyx kikaiensis idioptyx H.A. Pilsbry, 1909 - (CLAUSILIIDAE)
- Idiopyrgus, Genus Idiopyrgus H.A. Pilsbry, 1911 (POMATIOPSIDAE)
- Idioraphe, Subgenus Teinostoma (Idioraphe) H.A. Pilsbry, 1922 † (TORNIDAE) (FOSSIL)
- IDIOSEPIIDAE Appellöf, 1898 - Family (CEPHALOPODA-COLEOIDEA [Subclass]-DECAPODIFORMES [Superorder]-DECAPODIFORMES (unassigned) [Order])
- Idiosepion, syn of: Genus Idiosepius J.J.S. Steenstrup, 1881 (IDIOSEPIIDAE)
- Idiosepius, Genus Idiosepius J.J.S. Steenstrup, 1881 (IDIOSEPIIDAE)
- Idiostemma, Genus Idiostemma H.A. Pilsbry & E.G. Vanatta, 1898 (UROCOPTIDAE)
- Idioteredo, syn of: Genus Teredothyra P. Bartsch, 1921 (TEREDINIDAE)
- Idioteuthis, Genus Idioteuthis M. Sasaki, 1916 (MASTIGOTEUTHIDAE)
- idiotrypa, Hemicycla idiotrypa J.F. Mabille, 1883 - syn of: Hemicycla consobrina (A.E.J. Férussac, 1821) - (HELICIDAE)
- Idiozaptyx, syn of: Genus Zaptyx H.A. Pilsbry, 1901 (CLAUSILIIDAE)
- idjowensis, Mitra idjowensis C.H. Oostingh, 1939 - syn of: Nebularia fraga (J.R.C. Quoy & J.P. Gaimard, 1833) - (MITRIDAE)
- Idoceras, Genus Idoceras Burckhardt, 1906 † (AMMONOIDEA (UNASSIGNED)) (FOSSIL)
- idoceroides, Graefenbergites idoceroides (Dorn, 1930 †) - (PERISPHINCTIDAE) (FOSSIL)
- idoleum, Mipus idoleum I.H. Jonas, 1847 - syn of: Mipus gyratus (R.B. Hinds, 1844) - (MURICIDAE)
- Idolum, syn of: Genus Gonidomus W.J. Swainson, 1840 (STREPTAXIDAE)
- idonea, Dallarca idonea (T.A. Conrad, 1832 †) - (ARCIDAE) (FOSSIL)
- idonea, Bicorbula idonea (T.A. Conrad, 1833 †) - (CORBULIDAE) (FOSSIL)
- idonea, Glycymeris idonea T.A. Conrad, 1833 † - (GLYCYMERIDIDAE) (FOSSIL)
- idonea, Limopsis idonea (T. Iredale, 1929) - (LIMOPSIDAE)
- idonea, Oliva idonea T.A. Conrad, 1839 † - (OLIVIDAE) (FOSSIL)
- idonea, Tellina idonea G.P. Deshayes, 1857 † - (TELLINIDAE) (FOSSIL)
- idonea, Triphora idonea J.C. Melvill & R. Standen, 1901 - (TRIPHORIDAE)
- Idonearca, Subgenus Cucullaea (Idonearca) Conrad, 1862 † (CUCULLAEIDAE) (FOSSIL)
- idoneus, Acteon idoneus T.A. Conrad, 1833 † - (ACTEONIDAE) (FOSSIL)
- idoneus, Sirius idoneus (T. Iredale, 1931) - (CAPULIDAE)
- idoneus, Donax idoneus T.A. Conrad, 1872 † - (DONACIDAE) (FOSSIL)
- idosia, Engina idosia (P.L. Duclos, 1835) - (BUCCINIDAE)
- idothea, Cymatosyrinx idothea W.H. Dall, 1919 - (DRILLIIDAE)
- Idothea, syn of: Genus Fimbria J.K. Megerle Von Mühlfeld, 1811 (LUCINIDAE)
- idothea, Turbonilla idothea P. Bartsch, 1927 - (PYRAMIDELLIDAE)
- Idotoea, syn of: Genus Fimbria J.K. Megerle Von Mühlfeld, 1811 (LUCINIDAE)
- idriaensis, Acutostrea idriaensis (W.M. Gabb, 1869 †) - (FLEMINGOSTREIDAE) (FOSSIL)
- idriaensis, Ostrea idriaensis W.M. Gabb, 1869 † - syn of: Acutostrea idriaensis (W.M. Gabb, 1869 †) - (OSTREIDAE) (FOSSIL)
- idrianus, Tirolites idrianus (J. Von Hauer, 1865 †) - (TIROLITIDAE) (FOSSIL)
- idrina, Anodonta idrina G.B. Spinelli, 1851 - syn of: Anodonta cygnea (C. Linnaeus, 1758) - (UNIONIDAE)
- idrinella, Anodonta idrinella J.R. Bourguignat, 1885 - syn of: Anodonta cygnea (C. Linnaeus, 1758) - (UNIONIDAE)
- idryta, Hemicycla idryta J.F. Mabille, 1882 - syn of: Hemicycla bidentalis (J.B.P.A. Lamarck, 1811) - (HELICIDAE)
- idsubonini, Parayoldiella idsubonini (Z.A. Filatova, 1971) - (NUCULANIDAE)
- idsubonini, Yoldiella idsubonini Z.A. Filatova, 1971 - syn of: Parayoldiella idsubonini (Z.A. Filatova, 1971) - (YOLDIIDAE)
- idulia, Columbella idulia P.L. Duclos, 1840 - syn of: Euplica scripta (J.B.P.A. Lamarck, 1822) - (COLUMBELLIDAE)
- idulia, Euplica idulia P.L. Duclos, 1835 - syn of: Euplica scripta (J.B.P.A. Lamarck, 1822) - (COLUMBELLIDAE)
- Idulia, syn of: Genus Doto L. Oken, 1815 (DOTIDAE)
- Iduliana, syn of: Genus Hancockia P.H. Gosse, 1877 (HANCOCKIIDAE)
- Iduliella, syn of: Genus Doto L. Oken, 1815 (DOTIDAE)
- idunae, Pseudocardioceras idunae (Diener, 1920 †) - (JUVAVITIDAE) (FOSSIL)
- Idyla, Genus Idyla H. Adams & A. Adams, 1855 (CLAUSILIIDAE)
- idyllia, Nassa idyllia J.C. Melvill & R. Standen, 1901 - syn of: Nassarius idyllius (J.C. Melvill & R. Standen, 1901) - (NASSARIIDAE)
- idyllica, Isabellaria idyllica (E. Gittenberger, 1987) - (CLAUSILIIDAE)
- idyllium, Antillophos idyllium K. Fraussen & G.T. Poppe, 2005 - (NASSARIIDAE)
- idyllius, Nassarius idyllius (J.C. Melvill & R. Standen, 1901) - (NASSARIIDAE)
- Idylopsina, syn of: Genus Bulgarica O. Böttger, 1877 (CLAUSILIIDAE)
- idzumonis, Euhadra idzumonis H.A. Pilsbry & J.T. Gulick, 1900 - (BRADYBAENIDAE)
- ieacocki, Alvania ieacocki R.B. Watson, 1875 - syn of: Alvania leacocki (R.B. Watson, 1873) - (RISSOIDAE)
- ieetwaarti, Albinaria ieetwaarti E. Gittenberger & H.P.M.G. Menkhorst, 1992 - syn of: Albinaria inauris ietswaarti E. Gittenberger & H.P.M.G. Menkhorst, 1992 - (CLAUSILIIDAE)
- iehringi, Anodontites tenebricosa iehringi (H.F.A. von Ihering, 1893) - (MYCETOPODIDAE)
- iejimanus, Coniglobus mercatorius iejimanus (H.A. Pilsbry & Y. Hirase, 1905) - (CAMAENIDAE)
- iejimensis, Carditella iejimensis I. Hayami & T. Kase, 1993 - (CONDYLOCARDIIDAE)
- iejimensis, Sansonia iejimensis T. Kase, 1998 - (PICKWORTHIIDAE)
- iemanja, Taringa iemanja J. Alvim & A. Pimenta, 2013 - (DISCODORIDIDAE)
- iemanja, Murexiella iemanja E.J. Petuch, 1979 - syn of: Favartia glypta (M. Smith, 1938) - (MURICIDAE)
- iemanjai, Murexiella iemanjai E.J. Petuch, 1979 - syn of: Favartia glypta (M. Smith, 1938) - (MURICIDAE)
- ierapetranus, Mastus ierapetranus W.J.M. Maassen, 1995 - (ENIDAE)
- iesakai, Crassatellites iesakai A. Mizuno, 1952 † - syn of: Crassatella inconspicuus T. Nagao, 1928 † - (CRASSATELLIDAE) (FOSSIL)
- iesakai, Periploma iesakai K. Oyama & A. Mizuno, 1958 † - (PERIPLOMATIDAE) (FOSSIL)
- iessoensis, Obesotoma iessoensis (E.A. Smith, 1875) - (MANGELIIDAE)
- ietswaarti, Albinaria ietswaarti E. Gittenberger & H.P.M.G. Menkhorst, 1992 - syn of: Albinaria inauris ietswaarti E. Gittenberger & H.P.M.G. Menkhorst, 1992 - (CLAUSILIIDAE)
- ietswaarti, Albinaria inauris ietswaarti E. Gittenberger & H.P.M.G. Menkhorst, 1992 - (CLAUSILIIDAE)
- ievesense, Discoceras ievesense Balaschov, 1953 † - (DISCOCERATIDAE) (FOSSIL)
- Ifremeria, Genus Ifremeria P. Bouchet & A. Warén, 1991 (PROVANNIDAE)
- ifrimae, Kitchinites ifrimae Salazar & al., 2010 † - (DESMOCERATIDAE) (FOSSIL)
- iga, Buccinum iga J.G. Bruguière, 1789 † - syn of: Tritia miga (J.G. Bruguière, 1789 †) - (BUCCINIDAE) (FOSSIL)
- igarkae, Lymnaea igarkae Gundrizer & Y.I. Starobogatov, 1979 - (LYMNAEIDAE)
- Igarkiella, Genus Igarkiella Vassiljeva, 1998 (IGARKIELLIDAE) (FOSSIL)
- IGARKIELLIDAE Parkhaev, 2001 † - Family (HELCIONELLOIDA-ARCHAEOBRANCHIA [Subclass]-HELCIONELLIFORMES [Order]-HELCIONELLOIDEA [Superfamily]) (FOSSIL)
- igbarasana, Ryssota sauli igbarasana P. Bartsch, 1939 - (CHRONIDAE)
- igembiense, Pseudopeas igembiense M. Connolly, 1923 - (SUBULINIDAE)
- ighinae, Hexaplex ighinae L.M.D. Bellardi, 1872 † - (MURICIDAE) (FOSSIL)
- ighinai, Ptychocerithium ighinai (O.G. Michelotti, 1861 †) - (CERITHIIDAE) (FOSSIL)
- ighinai, Conus ighinai Michelotti, 1861 † - (CONIDAE) (FOSSIL)
- igilicus, Oxychilus igilicus F.L. Giusti, 1968 - syn of: Oxychilus draparnaudi (H.H. Beck, 1837) - (OXYCHILIDAE)
- igla, Montereina igla (Er. Marcus & Ev. Marcus, 1967) - (DISCODORIDIDAE)
- iglesiasi, Turbonilla iglesiasi A. Peñas & E. Rolán, 2010 - (PYRAMIDELLIDAE)
- Iglica, Genus Iglica A. Wagner, 1927 (HYDROBIIDAE)
- ignacia, Turbonilla ignacia W.H. Dall & P. Bartsch, 1909 - (PYRAMIDELLIDAE)
- Ignara, Genus Ignara Sinitsyna, 1986 † (PTERIIDA (UNASSIGNED)) (FOSSIL)
- ignara, Ignara ignara Sinitsyna 1986 † - (PTERIIDA (UNASSIGNED)) (FOSSIL)
- ignari, Unio ignari J.R. Bourguignat, 1889 - syn of: Unio arcuatus N.R. Bouchard-Chantereaux, 1838 - (UNIONIDAE)
- ignariformis, Unio ignariformis J.R. Bourguignat, 1889 - syn of: Unio arcuatus N.R. Bouchard-Chantereaux, 1838 - (UNIONIDAE)
- ignati, Alabina ignati P. Bartsch, 1911 - (CERITHIIDAE)
- ignava, Rugadentia ignava (C. Hedley, 1908) - (PYRAMIDELLIDAE)
- ignava, Linopyrga ignava (C. Hedley, 1908) - syn of: Rugadentia ignava (C. Hedley, 1908) - (PYRAMIDELLIDAE)
- ignavus, Bulimus ignavus L.A. Reeve, 1849 - syn of: Bulimulus unicolor (G.B. I Sowerby, 1833) - (BULIMULIDAE)
- ignea, Pisania ignea (J.F. Gmelin, 1791) - (BUCCINIDAE)
- ignea, Grandinenia ignea H. Nordsieck, 2012 - (CLAUSILIIDAE)
- ignea, Costellaria ignea W. Wood, 1828 - syn of: Vexillum costatum (J.F. Gmelin, 1791) - (COSTELLARIIDAE)
- ignea, Chondropoma ignea (L.A. Reeve, 1838) - (POMATIIDAE)
- ignekensis, Astarte ignekensis Imlay, 1961 † - (ASTARTIDAE) (FOSSIL)
- ignescens, Naninia ignescens (L. Pfeiffer) - (ARIOPHANTIDAE)
- igneus, Spondylus igneus H.C. Fulton, 1915 - syn of: Spondylus nicobaricus K. Schreibers, 1793 - (SPONDYLIDAE)
- igneus, Jujubinus igneus T.A. de M. Monterosato, 1896 - (TROCHIDAE)
- igneus, Jujubinus igneus R. Sturany, 1896 - syn of: Jujubinus exasperatus (T. Pennant, 1777) - (TROCHIDAE)
- ignicolor, Chondropometes vignalense ignicolor C. de la Torre & P. Bartsch, 1938 - (POMATIIDAE)
- ignicoma, Lucidella ignicoma (R.J.L. Guppy, 1868) - (HELICINIDAE)
- ignicula, Engina ignicula K. Fraussen, 2004 - (BUCCINIDAE)
- igniculus, Cellana igniculus T. Kase, T. Nakano, Y. Kurihara & T. Haga, 2013 † - (NACELLIDAE) (FOSSIL)
- ignifer, Afer ignifer (K. Fraussen & A. Trencart, 2008) - (BUCCINIDAE)
- ignifer, Marginella ignifer S.G. Veldsman, 2017 - (MARGINELLIDAE)
- ignifer, Streptosiphon ignifer K. Fraussen & A. Trencart, 2008 - syn of: Afer ignifer (K. Fraussen & A. Trencart, 2008) - (TURBINELLIDAE)
- igniflua, Thalassohelix igniflua (L.A. Reeve, 1852) - (CHAROPIDAE)
- igniflua, Therasia igniflua L.A. Reeve, 1852 - syn of: Thalassohelix igniflua (L.A. Reeve, 1852) - (CHAROPIDAE)
- igniflua, Daphnella igniflua (L.A. Reeve, 1845) - (RAPHITOMIDAE)
- igniflua, Pleurotoma igniflua L.A. Reeve, 1845 - syn of: Monostiolum tessellatum (L.A. Reeve, 1844) - (TURRIDAE)
- ignilabre albilabre, Pomatias ignilabre albilabre C.B. Adams, 1851 - syn of: Adamsiella ignilabris (C.B. Adams, 1849) - (POMATIIDAE)
- ignilabris, Adamsiella ignilabris (C.B. Adams, 1849) - (POMATIIDAE)
- ignis, Learchis ignis Crescini, De Sisto & Villalba, 2013 - (FACELINIDAE)
- ignis, Berthellina ignis J. Alvim & A. Pimenta, 2015 - (PLEUROBRANCHIDAE)
- ignis, Janolus ignis M.C. Miller & R.C. Willan, 1986 - (PROCTONOTIDAE)
- ignivenatus, Kendrickia ignivenatus G.A. Solem, 1985 - (CAMAENIDAE)
- ignobilis, Helicostyla ignobilis G.B. I Sowerby, 1841 - (BRADYBAENIDAE)
- ignobilis, Bostryx ignobilis R.A. Philippi, 1867 - (BULIMULIDAE)
- ignobilis, Bursina ignobilis (A.G. Beu, 1987) - (BURSIDAE)
- ignobilis, Pinguiphaedusa ignobilis (E.R. Sykes, 1895) - (CLAUSILIIDAE)
- ignobilis, Gradiella ignobilis (Böhm, 1895 †) - (COELOSTYLINIDAE) (FOSSIL)
- ignobilis, Conus ignobilis A.G. Olivi, 1792 - syn of: Lautoconus ventricosus (J.F. Gmelin, 1791) - (CONIDAE)
- ignobilis, Conus ignobilis A. Scacchi, 1836 - syn of: Lautoconus ventricosus (J.F. Gmelin, 1791) - (CONIDAE)
- ignobilis, Corbicula ignobilis P.M. Heude, 1887 - syn of: Corbicula fluminea (O.F. Müller, 1774) - (CYRENIDAE)
- ignobilis, Daonella ignobilis C. Chen, 1976 † - (DAONELLIDAE) (FOSSIL)
- ignobilis, Harpagodes ignobilis (Morris & J. Lycett, 1851 †) - (HARPAGODIDAE) (FOSSIL)
- ignobilis, Mitra ignobilis L.A. Reeve, 1844 - syn of: Mitra ustulata L.A. Reeve, 1844 - (MITRIDAE)
- ignobilis, Potadoma ignobilis K.H.J. Thiele, 1911 - (PACHYCHILIDAE)
- ignobilis, Rugulina ignobilis (K.H.J. Thiele, 1912) - (PENDROMIDAE)
- ignobilis, Triphora ignobilis K.H.J. Thiele, 1925 - (TRIPHORIDAE)
- ignobilis, Venus ignobilis H.E. Anton in R.A. Philippi, 1847 - syn of: Marcia hiantina (J.B.P.A. Lamarck, 1818) - (VENERIDAE)
- ignobilis rufa, Conus ignobilis rufa A. Scacchi, 1836 - syn of: Lautoconus ventricosus (J.F. Gmelin, 1791) - (CONIDAE)
- Ignoceras, Genus Ignoceras Flower, 1976 † (ENDOCERATIDAE) (FOSSIL)
- ignolea, Glossus ignolea L.C. Glenn, 1904 † - (GLOSSIDAE) (FOSSIL)
- ignorabilis, Koloonella ignorabilis (A. Peñas & E. Rolán, 1997) - (MURCHISONELLIDAE)
- ignorabilis, Eulimella ignorabilis A. Peñas & E. Rolán, 1997 - syn of: Koloonella ignorabilis (A. Peñas & E. Rolán, 1997) - (PYRAMIDELLIDAE)
- ignorata, Megacardita ignorata (A.E.M. Cossmann & M.A. Peyrot, 1912 †) - (CARDITIDAE) (FOSSIL)
- ignorata, Helix ignorata O. Böttger, 1905 - syn of: Monacha ignorata (O. Böttger, 1905) - (HELICIDAE)
- ignorata, Monacha ignorata (O. Böttger, 1905) - (HYGROMIIDAE)
- ignorata, Orculella ignorata B. Hausdorf, 1996 - (ORCULIDAE)
- ignorata, Hindsiclava ignorata D. Frassinetti & Covacevich, 1995 - (PSEUDOMELATOMIDAE)
- ignorata, Stephanozyga ignorata (Trautschold, 1867 †) - (PSEUDOZYGOPLEURIDAE) (FOSSIL)
- ignorata, Odostomia ignorata (T.A. de M. Monterosato, 1917) - (PYRAMIDELLIDAE)
- ignorata, Rissoa ignorata P.M. Pallary, 1920 - syn of: Alvania subareolata T.A. de M. Monterosato, 1869 - (RISSOIDAE)
- ignorata, Opacuincola ignorata M. Haase, 2008 - (TATEIDAE)
- ignorata, Zygopleura ignorata Trautschold, 1867 † - syn of: Stephanozyga ignorata (Trautschold, 1867 †) - (ZYGOPLEURIDAE) (FOSSIL)
- ignoratus, Gyraulus ignoratus Schlickum & Puisségur, 1977 † - (PLANORBIDAE) (FOSSIL)
- ignota, Metassiminea ignota K.H.J. Thiele, 1927 - (ASSIMINEIDAE)
- ignota, Strophiops eurystoma ignota C.J. Maynard, 1896 - (CERIONIDAE)
- ignota, Clione ignota Janssen, 2012 † - (CLIONIDAE) (FOSSIL)
- ignota, Trippa ignota A. Pruvot-Fol, 1954 - (DISCODORIDIDAE)
- ignota, Fusceulima ignota (K.H.J. Thiele, 1925) - (EULIMIDAE)
- ignota, Pyrgulopsis ignota R. Hershler, H.P. Liu & H.G. Lang, 2010 - (HYDROBIIDAE)
- ignota, Candidula ignota J.F. Mabille, 1865 - syn of: Candidula intersecta (J.L.M. Poiret, 1801) - (HYGROMIIDAE)
- ignota, Plicacesta ignota (Devjatilova, 1981 †) - (LIMIDAE) (FOSSIL)
- ignota, Dentimargo ignota F.P. Jousseaume, 1875 - syn of: Dentimargo neglecta (G.B. I Sowerby, 1846) - (MARGINELLIDAE)
- ignota, Borissia ignota (Pronina, 1969 †) - (NUCULANIDAE) (FOSSIL)
- ignota, Uptonia ignota (C.T. Simpson, 1855 †) - (POLYMORPHITIDAE) (FOSSIL)
- ignota, Alvania ignota A. Cecalupo & I. Perugia, 2009 - (RISSOIDAE)
- ignota, Tegula ignota J. Ramírez-Böhme, 1976 - (TEGULIDAE)
- ignotellus, Anisus ignotellus (W. Dybowski, 1913) - (PLANORBIDAE)
- ignotum, Cyrtotoma ignotum P. Bartsch & J.P.E. Morrison, 1942 - syn of: Aperostoma mexicanum (K.T. Menke, 1830) - (NEOCYCLOTIDAE)
- ignotum, Crocidopoma gundlachi ignotum C. de la Torre & P. Bartsch, 1942 - (NEOCYCLOTIDAE)
- ignotum, Chondrothyrium violaceum ignotum C. de la Torre & P. Bartsch, 1938 - (POMATIIDAE)
- ignotus, Aidemofusus ignotus A. Kosyan & Y.I. Kantor, 2013 - (BUCCINIDAE)
- ignotus, Kellyconus ignotus (W.P. Cargile, 1998) - (CONIDAE)
- Igonoia, Genus Igonoia R.L. Squires, 2011 † (TROCHIDAE) (FOSSIL)
- Igorella, Genus Igorella Rozanov & al., 1969 † (HELCIONELLIDAE) (FOSSIL)
- Igorellina, syn of: Genus Igorella Rozanov & al., 1969 † (HELCIONELLIDAE) (FOSSIL)
- igori, Lithancylus igori Mikhailova & Baraboshkin, 2001 † - (ANCYLOCERATIDAE) (FOSSIL)
- igori, Pyramus igori Biakov, 2005 † - (MEGADESMIDAE) (FOSSIL)
- iguallalensis, Coactunio iguallalensis (D. Mongin, 1963 †) - (UNIONIDAE) (FOSSIL)
- iguallalensis, Chamberlainia iguallalensis D. Mongin, 1963 † - syn of: Coactunio iguallalensis (D. Mongin, 1963 †) - (UNIONIDAE) (FOSSIL)
- iguapensis, Helicina iguapensis H.A. Pilsbry, 1900 - (HELICINIDAE)
- iguapensis, Streptaxis iguapensis H.F.A. von Ihering, 1901 - (STREPTAXIDAE)
- iguapensis, Speironepion iguapensis (H.A. Pilsbry, 1901) - (STROPHOCHEILIDAE)
- iguazuensis, Chilina iguazuensis D.E. Gutiérrez Gregoric & A. Rumi, 2008 - (CHILINIDAE)
- iguazuensis, Eupera iguazuensis C.F. Ituarte, 1989 - (SPHAERIIDAE)
- Iheringella, syn of: Genus Haasica E. Strand, 1932 (MYCETOPODIDAE)
- iheringi, Felipponea iheringi (H.A. Pilsbry, 1933) - (AMPULLARIIDAE)
- iheringi, Cyerce iheringi J.P.L. Pelseneer, 1892 - syn of: Cyerce cristallina (S. Trinchese, 1881) - (CALIPHYLLIDAE)
- iheringi, Calliostoma iheringi W.H. Dall, 1927 - syn of: Calliostoma militaris H.F.A. von Ihering, 1907 - (CALLIOSTOMATIDAE)
- iheringi, Patagonicardium iheringi D. Frassinetti & Covacevich, 1999 † - (CARDIIDAE) (FOSSIL)
- iheringi, Semicassis labiata iheringi (A. Carcelles, 1953) - (CASSIDAE)
- iheringi, Stephanoda iheringi C.M.F. Ancey, 1899 - syn of: Radiodiscus iheringi (C.M.F. Ancey, 1899) - (CHAROPIDAE)
- iheringi, Chilina iheringi W.B. Marshall, 1933 - syn of: Chilina dombeiana (J.G. Bruguière, 1789) - (CHILINIDAE)
- iheringi, Chromodoris iheringi L.S.R. Bergh, 1879 - syn of: Felimida luteorosea (J.L. Rapp, 1827) - (CHROMODORIDIDAE)
- iheringi, Conus iheringi J. Frenguelli, 1946 - syn of: Lamniconus carcellesi (C.M. Martins, 1945) - (CONIDAE)
- iheringi, Cyanocyclas iheringi W.B. Marshall, 1927 - syn of: Corbicula limosa (W.G. Maton, 1809) - (CYRENIDAE)
- iheringi, Gastrocopta iheringi (H.H. Suter, 1900) - (GASTROCOPTIDAE)
- iheringi, Alcadia iheringi A.J. Wagner, 1910 - (HELICINIDAE)
- iheringi, Radiodiscus iheringi (C.M.F. Ancey, 1899) - (HELICODISCIDAE)
- iheringi, Diplodon iheringi C.T. Simpson, 1914 - syn of: Rhipidodonta burroughiana (I. Lea, 1834) - (HYRIIDAE)
- iheringi, Castalina iheringi W.B. Marshall - syn of: Castalia undosa E.C. Von Martens, 1895 - (HYRIIDAE)
- iheringi, Potamolithus iheringi H.A. Pilsbry, 1896 - (LITHOGLYPHIDAE)
- iheringi, Trinitasia iheringi (W.H. Dall, 1897) - (MACTRIDAE)
- iheringi, Megaspira iheringi H.A. Pilsbry, 1925 - (MEGASPIRIDAE)
- iheringi, Callionepion iheringi H.A. Pilsbry & E.G. Vanatta, 1899 - (MEGASPIRIDAE)
- Iheringi, Mycetopoda Iheringi M. Doello-Jurado, 1923 - syn of: Mycetopoda soleniformis D'Orbigny, 1835 - (MYCETOPODIDAE)
- iheringi, Cyclodontina iheringi (W.B. Marshall, 1926) - (ODONTOSTOMIDAE)
- iheringi, Peltella iheringi J.L.M. Leme, 1968 - (ORTHALICIDAE)
- iheringi, Doryssa iheringi (F.C. Baker, 1913) - (PACHYCHILIDAE)
- iheringi, Pupilla iheringi H.H. Suter, 1900 - (PUPILLIDAE)
- iheringi, Turbonilla iheringi S. Clessin, 1900 - syn of: Turbonilla brasiliensis S. Clessin, 1902 - (PYRAMIDELLIDAE)
- iheringi, Pyrunculus iheringi H.F.A. von Ihering, 1915 - syn of: Pyrunculus caelatus (K.J. Bush, 1885) - (RETUSIDAE)
- iheringi, Happia iheringi (S. Clessin, 1888) - (SCOLODONTIDAE)
- iheringi, Retigyra iheringi (P. Dautzenberg & H. Fischer, 1897) - (SEGUENZIOIDEA (UNASSIGNED))
- iheringi, Streptaxis iheringi H.A. Pilsbry, 1930 - (STREPTAXIDAE)
- iheringi, Antarctodarwinella iheringi Y. Camacho-García & Zinsmeister, 1989 † - (STRUTHIOLARIIDAE) (FOSSIL)
- iheringi, Tellina iheringi W.H. Dall, 1900 - (TELLINIDAE)
- iheringi, Peratotoma iheringi A.E.M. Cossmann, 1899 † - (TURRIDAE) (FOSSIL)
- iheringi, Unio iheringi B.H. Wright, 1898 - syn of: Sphenonaias taumilapana (T.A. Conrad, 1855) - (UNIONIDAE)
- iheringi, Anodonta iheringi S. Clessin, 1882 - syn of: Anodontites patagonica J.B.P.A. Lamarck, 1819 - (UNIONIDAE)
- iheringi, Gomphina iheringi Zinsmeister 1984 † - (VENERIDAE) (FOSSIL)
- iheringi, Austrocallista iheringi (A.E.M. Cossmann, 1898 †) - (VENERIDAE) (FOSSIL)
- iheringi, Meretrix iheringi W.H. Dall, 1891 - syn of: Tivela dentaria (J.B.P.A. Lamarck, 1818) - (VENERIDAE)
- iheringi schadei, Schleschiella iheringi schadei H. Modell, 1950 - syn of: Rhipidodonta hylaea (A.V.M.D. D'Orbigny, 1835) - (HYRIIDAE)
- iheringiana, Corbula iheringiana H.A. Pilsbry, 1897 - syn of: Sphenia fragilis (H. Adams & A. Adams, 1854) - (CORBULIDAE)
- iheringiana, Sphenia iheringiana H.A. Pilsbry, 1897 - (MYIDAE)
- Iheringicardium, Subgenus Hedecardium (Iheringicardium) Schneider, 2002 † (CARDIIDAE) (FOSSIL)
- iheringii, Swiftopecten iheringii del Rio, 1995 † - (PECTINIDAE) (FOSSIL)
- Iheringinucula, Genus Iheringinucula del Rio & Camacho, 1996 † (NUCULIDA (UNASSIGNED)) (FOSSIL)
- iherminieri, Bulimulus iherminieri (P. Fischer, 1857) - (BULIMULIDAE)
- iheyaensis, Bradybaena phaeogramma iheyaensis H.A. Pilsbry & Y. Hirase, 1905 - (BRADYBAENIDAE)
- iheyaensis, Satsuma iheyaensis H.A. Pilsbry & Y. Hirase, 1905 - (CAMAENIDAE)
- Iheyaspira, Genus Iheyaspira T.A. Okutani, T. Sasaki & E. Tsuchida, 2000 (SKENEIDAE)
- ihiihiensis, Achatinella apexfulva ihiihiensis D.A. Welch, 1942 - (ACHATINELLIDAE)
- ihli, Lyrodiscus ihli (B. Klika, 1891 †) - (ZONITIDAE) (FOSSIL)
- ihungia, Dentalium ihungia J. Marwick, 1931 † - (DENTALIIDAE) (FOSSIL)
- ihungia, Aoteadrillia ihungia (J. Marwick, 1931 †) - (HORAICLAVIDAE) (FOSSIL)
- Ihungia, Genus Ihungia Marwick, 1931 † (RISSOIDAE) (FOSSIL)
- iidensis, Glycymeris iidensis S. Kanno, 1956 † - syn of: Glycymeris idensis S. Kanno, 1956 † - (GLYCYMERIDIDAE) (FOSSIL)
- iijimai, Neoprososthenia iijimai (R.A.M. Brandt, 1970) - (POMATIOPSIDAE)
- iijimakuniakii, Megalophaedusa iijimakuniakii H. Minato & T. Habe, 1983 - (CLAUSILIIDAE)
- iitomiensis, Amussiopecten iitomiensis Y. Otuka, 1934 † - (PECTINIDAE) (FOSSIL)
- iizukai, Pleuroploca iizukai M. Yokoyama, 1928 - syn of: Pleuroploca audouini (I.H. Jonas, 1846) - (FASCIOLARIIDAE)
- iizukai, Meretrix iizukai M. Yokoyama, 1925 - syn of: Compsomyax subdiaphana (Carpenter, 1864) - (VENERIDAE)
- ijimae, Mesophaedusa ijimae (P. Ehrmann, 1900) - (CLAUSILIIDAE)
- iju, Hallaxa iju T.M. Gosliner & S. Johnson, 1994 - (ACTINOCYCLIDAE)
- ijzermani, Trivellona ijzermani Schilder 1937 - (TRIVIIDAE)
- ikanensis, Alycaeus ikanensis Foon & Liew, 2017 - (CYCLOPHORIDAE)
- ikanensis, Plectostoma ikanensis T.S. Liew, J.J. Vermeulen & al., 2014 - (DIPLOMMATINIDAE)
- ikaria, Deroceras ikaria P.L. Reischütz, 1983 - (AGRIOLIMACIDAE)
- ikaros, Mediterranea hydatina ikaros F. Riedel, 1983 - (OXYCHILIDAE)
- ikebei, Dianadema ikebei Morton & T. Haga, 2014 - (CLAVAGELLIDAE)
- ikebei, Myadora ikebei T. Habe, 1950 - (MYOCHAMIDAE)
- ikebei, Nuculana ikebei M. Suzuki & K. Kanehara, 1936 - (NUCULANIDAE)
- ikebei, Pulchrastele ikebei F.S. MacNeil, 1960 † - (TROCHIDAE) (FOSSIL)
- ikebei, Turritella ikebei (T. Kotaka, 1951 †) - (TURRITELLIDAE) (FOSSIL)
- Ikedaella, syn of: Genus Notoplax H. Adams, 1861 (ACANTHOCHITONIDAE)
- ikedai, Profundiconus ikedai T. Ninomiya, 1987 - (CONIDAE)
- ikedai, Nassarius ikedai Thach, 2017 - (NASSARIIDAE)
- ikenoi, Megalophaedusa ikenoi H. Minato, 1980 - (CLAUSILIIDAE)
- ikensis, Somoholites ikensis Ruzhentsev, 1950 † - (SOMOHOLITIDAE) (FOSSIL)
- iki, Anarithma iki E.A. Kay, 1979 - syn of: Anarithma metula (R.B. Hinds, 1843) - (MITROMORPHIDAE)
- iki, Brookula iki E.A. Kay, 1979 - (SEGUENZIOIDEA (UNASSIGNED))
- ikiana, Succinea ikiana H.A. Pilsbry & Y. Hirase, 1904 - (SUCCINEIDAE)
- ikianus, Graphoceras ikianus (Yokoyama †) - (GRAPHOCERATIDAE) (FOSSIL)
- ikiensis, Acusta despecta ikiensis H.A. Pilsbry & Y. Hirase, 1904 - (BRADYBAENIDAE)
- ikiensis, Hemizaptyx stimpsoni ikiensis H.A. Pilsbry, 1905 - (CLAUSILIIDAE)
- ikukoae, Calliostoma ikukoae K. Sakurai, 1994 - syn of: Otukaia kiheiziebisu (Y. Otuka, 1939) - (CALLIOSTOMATIDAE)
- ikukoae, Otukaia ikukoae K. Sakurai, 1994 - syn of: Otukaia kiheiziebisu (Y. Otuka, 1939) - (CALLIOSTOMATIDAE)
- ikukoae, Iniforis ikukoae (S. Kosuge, 1963) - (TRIPHORIDAE)
- ikvae, Microstele ikvae Prisyazhnyuk, 1971 † - (PUPILLIDAE) (FOSSIL)
- Ilaira, Genus Ilaira H. Adams & A. Adams, 1854 (LIOTIIDAE)
- ilanae, Xeropicta ilanae L. Forcart, 1981 - (HYGROMIIDAE)
- ilanense, Teicherticeras ilanense S. Shen, 1975 † - (TEICHERTICERATIDAE) (FOSSIL)
- ilanensis, Hemizaptyx ilanensis H. Nordsieck, 2003 - (CLAUSILIIDAE)
- Ilanga, Genus Ilanga D.G. Herbert, 1987 (SOLARIELLIDAE)
- ilapiriensis, Microcystis ilapiriensis K.C. Emberton & T.A. Pearce, 2000 - (EUCONULIDAE)
- ilapiryae, Sitala ilapiryae K.C. Emberton, 2000 - (ARIOPHANTIDAE)
- ilariae, Epitonium ilariae L. Bozzetti, 2007 - (EPITONIIDAE)
- ilariae, Comitas ilariae L. Bozzetti, 1991 - (PSEUDOMELATOMIDAE)
- Ilaucanianus, syn of: Genus Llaucanianus W.K. Weyrauch, 1967 (BULIMULIDAE)
- ilbi, Ilbia ilbi R.F. Burn, 1963 - (ILBIIDAE)
- Ilbia, Genus Ilbia R.F. Burn, 1963 (ILBIIDAE)
- ILBIIDAE Burn, 1963 - Family (GASTROPODA-HETEROBRANCHIA [Subclass]-OPISTHOBRANCHIA [Infraclass]-CEPHALASPIDEA [Order]-RUNCINOIDEA [Superfamily])
- Ildica, Genus Ildica L.S.R. Bergh, 1889 (RUNCINIDAE)
- ildiko, Calcarovula ildiko F.Jr. Lorenz, 2006 - (OVULIDAE)
- ile, Inella ile F.P. Jousseaume, 1898 - (TRIPHORIDAE)
- ilegiensis, Phrygica ilegiensis H. Nordsieck, 2004 - (CLAUSILIIDAE)
- ilerdensis, Chondrina ilerdensis P. Fagot, 1888 - syn of: Chondrina farinesii sexplicata A. Bofill, 1886 - (CHONDRINIDAE)
- Ilerdus, Genus Ilerdus Calzada, 1989 † (CALLIOTROPIDAE) (FOSSIL)
- ilfa, Turbonilla ilfa P. Bartsch, 1927 - (PYRAMIDELLIDAE)
- Ilfremeria, syn of: Genus Ifremeria P. Bouchet & A. Warén, 1991 (PROVANNIDAE)
- ilgazdaglariensis, Vitrea ilgazdaglariensis E. Neubert & F. Riedel, 1993 - (PRISTILOMATIDAE)
- ilhabelaensis, Simnialena ilhabelaensis D. Fehse, 2001 - (OVULIDAE)
- ilhabelensis, Calliostoma ilhabelensis A.C.G. Prado, 2003 - syn of: Calliostoma tupinamba A.P.S. Dornellas, 2012 - (CALLIOSTOMATIDAE)
- ilhagwilensis, Euspira ilhagwilensis J.M. Pacaud, 2016 † - (NATICIDAE) (FOSSIL)
- ilheocola, Auris ilheocola S. Moricand, 1833 - (BULIMULIDAE)
- Iliamneme, Subgenus Acrotoma (Iliamneme) A.A. Schileyko, 2007 (CLAUSILIIDAE)
- ilici, Valvata ilici Š. Brusina, 1897 † - (VALVATIDAE) (FOSSIL)
- ilidioi, Flabellina ilidioi G. Calado, J.A. Ortea & G.M. Caballer, 2005 - (FLABELLINIDAE)
- ilieni, Pyrgula elegantissima ilieni E. Jekelius, 1932 † - (HYDROBIIDAE) (FOSSIL)
- iliensis, Gigantomilax iliensis C.O. Van Regteren Altena, 1954 - syn of: Michaelisia nataliana (G.A. Michaelis, 1892) - (LIMACIDAE)
- iliensis, Lymnaea iliensis E.P. Lazareva, 1967 - (LYMNAEIDAE)
- Ilikala, Subgenus Leptachatina (Ilikala) C.M. Cooke, 1911 (AMASTRIDAE)
- Ilikalo, syn of: Subgenus Leptachatina (Ilikala) C.M. Cooke, 1911 (AMASTRIDAE)
- Iliochione, syn of: Genus Anomalocardia H.C.F. Schumacher, 1817 (VENERIDAE)
- ilione, Pseudamnicola ilione C. Radea & A. Parmakelis, 2016 - (HYDROBIIDAE)
- Ilionia, syn of: Genus Illionia Billings, 1874 † (LUCINIDAE) (FOSSIL)
- ilisima, Berthellina ilisima Er. Marcus & Ev. Marcus, 1967 - (PLEUROBRANCHIDAE)
- iliuliukensis, Odostomia iliuliukensis W.H. Dall & P. Bartsch, 1909 - (PYRAMIDELLIDAE)
- iliuliukensis, Alvania iliuliukensis P. Bartsch, 1911 - syn of: Alvania compacta (P.P. Carpenter, 1864) - (RISSOIDAE)
- ilius, Deroceras ilius H.R. Simroth, 1901 - (AGRIOLIMACIDAE)
- iljinae, Turricaspia iljinae (A.N. Golikov & Y.I. Starobogatov, 1966) - (HYDROBIIDAE)
- Iljinella, syn of: Genus Pyrgula G.J. De Cristofori & G. Jan, 1832 (HYDROBIIDAE)
- iljinensis, Anomia iljinensis V.N. Sinelnikova, 1991 † - (ANOMIIDAE) (FOSSIL)
- iljinensis, Chlamys iljinensis V.N. Sinelnikova, 1990 † - (PECTINIDAE) (FOSSIL)
- iljinensis, Gomphinella iljinensis V.N. Sinelnikova, 1990 † - (VENERIDAE) (FOSSIL)
- illa, Costasiella illa (Er. Marcus, 1965) - (COSTASIELLIDAE)
- illacidata, Subcancilla illacidata (W.P. Woodring, 1928 †) - (MITRIDAE) (FOSSIL)
- illamellata, Cochlodinella illamellata (B.H. Wright in L. Pfeiffer, 1864) - (UROCOPTIDAE)
- illarana, Semotrachia illarana G.A. Solem, 1993 - (CAMAENIDAE)
- illasiaca, Helix illasiaca G.B. Adami, 1885 - syn of: Faustina illyrica (G. Stabile, 1864) - (HELICIDAE)
- illasiacum, Cochlostoma illasiacum N. Pini, 1884 - syn of: Eupomatias henricae P. von Ströbel, 1851 - (COCHLOSTOMATIDAE)
- illauta, Mediterranea illauta J.R. Bourguignat, 1880 - syn of: Mediterranea hydatina (E.A. Rossmässler, 1838) - (OXYCHILIDAE)
- illawarensis, Aviculopecten illawarensis Morris, 1845 † - syn of: Deltopecten illawarrensis (Morris, 1845 †) - (AVICULOPECTINIDAE) (FOSSIL)
- illawarensis, Deltopecten illawarensis Morris, 1845 † - syn of: Deltopecten illawarrensis (Morris, 1845 †) - (DELTOPECTINIDAE) (FOSSIL)
- illawarensis, Pecten illawarensis Morris, 1845 † - syn of: Deltopecten illawarrensis (Morris, 1845 †) - (PECTINIDAE) (FOSSIL)
- illawarra, Conus illawarra T.A. Garrard, 1961 - syn of: Austroconus sydneyensis (G.B. III Sowerby, 1887) - (CONIDAE)
- illawarra, Leptoconus illawarra T.A. Garrard, 1961 - syn of: Austroconus sydneyensis (G.B. III Sowerby, 1887) - (CONIDAE)
- illawarrensis, Deltopecten illawarrensis (Morris, 1845 †) - (DELTOPECTINIDAE) (FOSSIL)
- illawarrensis, Pecten illawarrensis Morris, 1845 † - syn of: Deltopecten illawarrensis (Morris, 1845 †) - (PECTINIDAE) (FOSSIL)
- Illawarrotheca, Genus Illawarrotheca Malinky , 2009 † (AUSTRALOTHECIDAE) (FOSSIL)
- illbilleeana, Semotrachia illbilleeana G.A. Solem, 1993 - (CAMAENIDAE)
- illecebra, Thala illecebra J.C. Melvill, 1927 - syn of: Thala milium (L.A. Reeve, 1845) - (COSTELLARIIDAE)
- illecebra, Mitra illecebra J.C. Melvill, 1927 - syn of: Thala milium (L.A. Reeve, 1845) - (MITRIDAE)
- illecebrosa, Illex illecebrosa C.A. Lesueur, 1821 - syn of: Illex illecebrosus (C.A. Lesueur, 1821) - (OMMASTREPHIDAE)
- illecebrosus, Illex illecebrosus (C.A. Lesueur, 1821) - (OMMASTREPHIDAE)
- illecebrosus, Scaphander illecebrosus T. Iredale, 1925 - (SCAPHANDRIDAE)
- illecta, Corbula illecta (C.R. Laws, 1941 †) - (CORBULIDAE) (FOSSIL)
- illepida, Nuculana illepida T. Iredale, 1929 - (NUCULANIDAE)
- illepida, Struthiolaria illepida J.A. Bartrum & Powell, 1928 † - (STRUTHIOLARIIDAE) (FOSSIL)
- Illesca, Genus Illesca Olsson, 1932 † (CARDIIDA (UNASSIGNED)) (FOSSIL)
- illesca, Lamprodoma illesca A.A. Olsson, 1931 † - (OLIVELLIDAE) (FOSSIL)
- illesca, Pecten illesca A.A. Olsson, 1932 † - (PECTINIDAE) (FOSSIL)
- illesca, Turritella illesca A.A. Olsson, 1932 † - (TURRITELLIDAE) (FOSSIL)
- illevis, Poromya illevis C. Hedley, 1913 - (POROMYIDAE)
- Illex, Genus Illex J.J.S. Steenstrup, 1880 (OMMASTREPHIDAE)
- illheocola, Auris illheocola S. Moricand, 1833 - syn of: Auris ilheocola S. Moricand, 1833 - (BULIMULIDAE)
- illibata, Tornatellaria sykesii illibata C.M. Cooke & H.A. Pilsbry, 1916 - (ACHATINELLIDAE)
- illibata, Indomitrella conspersa illibata (R.P.J. Hervier, 1899) - (COLUMBELLIDAE)
- illibatus, Gyraulus illibatus C.A. Westerlund, 1883 - (PLANORBIDAE)
- illibrata, Asteracmea illibrata (J.C. Verco, 1906) - (LOTTIIDAE)
- illibrata, Helcioniscus illibrata J.C. Verco, 1906 - syn of: Asteracmea illibrata (J.C. Verco, 1906) - (NACELLIDAE)
- illicita, Gymnobela illicita W.H. Dall, 1927 - (RAPHITOMIDAE)
- illicita, Sphincterochila illicita (A. Mousson, 1874) - (SPHINCTEROCHILIDAE)
- illicitum, Ropaloceras illicitum P.A. Zhuravleva, 1972 † - syn of: Lysagoroceras subfusiforme (Münster, 1840 †) - (DISCOSORIDA (unassigned)) (FOSSIL)
- illimis, Leptachatina illimis C.M. Cooke, 1910 - (AMASTRIDAE)
- illineata, Hemizyga illineata Knight, 1930 † - (PSEUDOZYGOPLEURIDAE) (FOSSIL)
- illineatus, Orthonema illineatus Erwin, 1988 † - (ORTHONEMATIDAE) (FOSSIL)
- illinoiensis, Ectomaria illinoiensis Weller, 1916 † - syn of: Hypasteroceras planulatum (Fucini, 1903 †) - (LOPHOSPIRIDAE) (FOSSIL)
- illinoiensis, Hypergonia illinoiensis Weller, 1916 † - (ORTHONEMIDAE) (FOSSIL)
- illinoisensis, Trepospira illinoisensis (A.H. Worthen, 1884 †) - (EOTOMARIIDAE) (FOSSIL)
- illinoisensis, Euomphalus illinoisensis Thein & Nitecki, 1974 † - (EUOMPHALIDAE) (FOSSIL)
- illinoisensis, Promytilus illinoisensis (A.H. Worthen, 1884 †) - (MYTILIDAE) (FOSSIL)
- illinoisensis, Preshumardites illinoisensis (Miller & Gurley, 1896 †) - (SHUMARDITIDAE) (FOSSIL)
- illinoisensis, Valvata sincera illinoisensis H.B. Baker, 1930 † - (VALVATIDAE) (FOSSIL)
- illiolus, Conus illiolus Dall, 1915 † - (CONIDAE) (FOSSIL)
- Illionia, Genus Illionia Billings, 1874 † (LUCINIDAE) (FOSSIL)
- illirensis, Atlasica illirensis (P.M. Pallary, 1936) - (HELICIDAE)
- illirica, Saccella illirica (F. Carrozza, 1987) - (NUCULANIDAE)
- illius, Medlicottia illius A. De Gregorio, 1930 † - (MEDLICOTTIIDAE) (FOSSIL)
- Illonesta, syn of: Genus Paryphantopsis K.H.J. Thiele, 1928 (CHAROPIDAE)
- illota, Barbatia illota (G.B. I Sowerby, 1833) - (ARCIDAE)
- illota, Arca illota G.B. I Sowerby, 1833 - syn of: Barbatia illota (G.B. I Sowerby, 1833) - (ARCIDAE)
- illota, Platyrhaphe illota (A.A. Gould, 1859) - (CYCLOPHORIDAE)
- illota, Sulcerato illota (R. Tate, 1890) - (TRIVIIDAE)
- illotus, Margarites illotus (R.B. Watson, 1886) - (MARGARITIDAE)
- illovoense, Epitonium illovoense (K.H. Barnard, 1963) - (EPITONIIDAE)
- illovoensis, Scala illovoensis K.H. Barnard, 1963 - syn of: Epitonium idalium (J.C. Melvill, 1912) - (EPITONIIDAE)
- illudens, Gyroma illudens J. Perner, 1907 † - (CATANTOSTOMATIDAE) (FOSSIL)
- illuminata, Nanaja illuminata A.A. Schileyko, 1978 - (HYGROMIIDAE)
- illuminata, Cellana illuminata A.A. Gould, 1846 - syn of: Cellana strigilis (J.B. Hombron & C.H. Jacquinot, 1841) - (NACELLIDAE)
- illuminata, Patella illuminata A.A. Gould, 1846 - syn of: Cellana strigilis (J.B. Hombron & C.H. Jacquinot, 1841) - (PATELLIDAE)
- illuminata, Polycera illuminata A.A. Gould, 1841 - syn of: Palio dubia (G.O. Sars, 1829) - (POLYCERIDAE)
- illuminatus, Chiton illuminatus L.A. Reeve, 1847 - syn of: Callochiton puniceus (A.A. Gould, 1846) - (CHITONIDAE)
- illuminatus, Lepidopleurus illuminatus L.A. Reeve, 1847 - syn of: Callochiton puniceus (A.A. Gould, 1846) - (LEPTOCHITONIDAE)
- Illunellaria, Subgenus Euxina (Illunellaria) W.A. Lindholm, 1924 (CLAUSILIIDAE)
- Illunellaria, syn of: Genus Euxina O. Böttger, 1877 (CLAUSILIIDAE)
- illusa, Stomatella illusa T. Iredale, 1940 - syn of: Stomatella impertusa (H.W. Burrows, 1815) - (TROCHIDAE)
- illusana, Helix illusana G. Servain - syn of: Arianta arbustorum (C. Linnaeus, 1758) - (HELICIDAE)
- illustra, Dentherona illustra (C.J. Gabriel, 1947) - (CHAROPIDAE)
- illustre, Strioterebrum illustre W.M.L. Malcolm & Y. Terryn, 2012 - (TEREBRIDAE)
- illustris, Claraxis illustris T. Iredale, 1936 - syn of: Granosolarium asperum (R.B. Hinds, 1844) - (ARCHITECTONICIDAE)
- illustris, Newboldius illustris H. Rolle, 1905 - syn of: Newboldius crichtoni (W.J. Broderip, 1836) - (BULIMULIDAE)
- illustris, Camaena illustris (L. Pfeiffer, 1842) - (CAMAENIDAE)
- illustris, Strigileuxina illustris E. Neubert, 1993 - (CLAUSILIIDAE)
- illustris, Helix illustris L. Pfeiffer, 1862 - syn of: Camaena illustris (L. Pfeiffer, 1842) - (HELICIDAE)
- illustris, Paladilhiopsis robiciana illustris (H. Schütt, 1970) - (MOITESSIERIIDAE)
- illustris, Haugia illustris (Denckmann, 1887 †) - (PHYMATOCERATIDAE) (FOSSIL)
- illustris, Troschelvindex illustris F. Poey - (POMATIIDAE)
- illustris, Rissoina illustris G.B. III Sowerby, 1894 - (RISSOINIDAE)
- illustris, Ilanga illustris (R. Sturany, 1903) - (SOLARIELLIDAE)
- illustris, Turritella illustris J.C. Melvill, 1904 - syn of: Turritella fultoni J.C. Melvill, 1897 - (TURRITELLIDAE)
- illustris vanbuensis, Camaena illustris vanbuensis (E.A. Smith, 1896) - (CAMAENIDAE)
- illuviosa, Xerotricha illuviosa G. Nevill, 1880 - syn of: Xerotricha conspurcata (J.P.R. Draparnaud, 1801) - (HYGROMIIDAE)
- illuviosa, Anodonta illuviosa J.R. Bourguignat, 1881 - syn of: Anodonta cygnea (C. Linnaeus, 1758) - (UNIONIDAE)
- Illyanassa, Genus Illyanassa † (NEOGASTROPODA (UNASSIGNED)) (FOSSIL)
- illyrica, Abida illyrica (E.A. Rossmässler, 1837) - (CHONDRINIDAE)
- illyrica, Granaria frumentum illyrica (E.A. Rossmässler, 1835) - (CHONDRINIDAE)
- illyrica, Herilla illyrica (O.F. von Möllendorff, 1899) - (CLAUSILIIDAE)
- illyrica, Balea illyrica C.A. Westerlund, 1878 - syn of: Balea perversa (C. Linnaeus, 1758) - (CLAUSILIIDAE)
- illyrica, Faustina illyrica (G. Stabile, 1864) - (HELICIDAE)
- illyrica, Iglica illyrica H. Schütt, 1975 - (HYDROBIIDAE)
- illyrica, Leptochondria illyrica (Bittner, 1890 †) - (LEIOPECTINIDAE) (FOSSIL)
- illyrica, Simnia spelta illyrica F.A. Schilder, 1927 - (OVULIDAE)
- Illyrica, syn of: Genus Carpathica A. Wagner, 1895 (OXYCHILIDAE)
- illyrica, Ferrissia illyrica (M. von Neumayr, 1880 †) - (PLANORBIDAE) (FOSSIL)
- illyrica, Vitrea illyrica (A.J. Wagner, 1907) - (PRISTILOMATIDAE)
- illyrica diabasis, Herilla illyrica diabasis (A.J. Wagner, 1919) - (CLAUSILIIDAE)
- illyrica medorella, Herilla illyrica medorella H. Nordsieck, 1971 - (CLAUSILIIDAE)
- illyrica medoroides, Herilla illyrica medoroides (A.J. Wagner, 1915) - (CLAUSILIIDAE)
- illyrica oribates, Herilla illyrica oribates (R. Sturany, 1909) - (CLAUSILIIDAE)
- illyrica savnikensis, Herilla illyrica savnikensis H. Nordsieck, 1971 - (CLAUSILIIDAE)
- illyrica tiesenhauseni, Faustina illyrica tiesenhauseni (P.V. Gredler, 1889) - (HELICIDAE)
- Illyricella, Genus Illyricella Neubauer, Mandic & Harzhauser, 2016 † (HYDROBIIDAE) (FOSSIL)
- Illyricocongeria, Genus Illyricocongeria Mandic, 2015 † (DREISSENIDAE) (FOSSIL)
- illyricum, Helix punctulatus illyricum G.B. I Sowerby, 1824 - (HELICIDAE)
- illyricus, Cochlostoma illyricus C.A. Westerlund, 1885 - syn of: Eupomatias henricae P. von Ströbel, 1851 - (COCHLOSTOMATIDAE)
- illyricus, Crystallus illyricus A.J. Wagner, 1907 - syn of: Vitrea illyrica (A.J. Wagner, 1907) - (PRISTILOMATIDAE)
- illyricus, Tirolites illyricus Mojsisovics, 1882 † - syn of: Tirolites idrianus (J. Von Hauer, 1865 †) - (TIROLITIDAE) (FOSSIL)
- Illyriobanatica, Subgenus Orcula (Illyriobanatica) Páll-Gergely & Deli, 2013 (ORCULIDAE)
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