- obulus, Nesodiscus obulus (A.A. Gould, 1846) - (ENDODONTIDAE)
- obumbrans, Taramelliceras obumbrans Hölder, 1955 † - (OPPELIIDAE) (FOSSIL)
- obunca, Palaeanodonta obunca (Netschajew, 1894 †) - (PALAEANODONTIDAE) (FOSSIL)
- obuncus, Unio obuncus I. Lea, 1871 - syn of: Fusconaia cor (T.A. Conrad, 1834) - (UNIONIDAE)
- obuti, Paranowakia obuti Boucek, 1964 † - (PARANOWAKIIDAE) (FOSSIL)
- obvallatum, Pararaphistoma obvallatum (Wahlenberg, 1821 †) - (LESUEURILLIDAE) (FOSSIL)
- obvallatum, Raphistoma obvallatum Wahlenberg, 1821 † - syn of: Pararaphistoma obvallatum (Wahlenberg, 1821 †) - (RAPHISTOMATIDAE) (FOSSIL)
- obvelata, Monetaria obvelata (J.B.P.A. Lamarck, 1810) - (CYPRAEIDAE)
- obvelata, Monetaria obvelata J.C. Melvill, 1888 - syn of: Monetaria annulus (C. Linnaeus, 1758) - (CYPRAEIDAE)
- obvelata, Sclerodoris obvelata O.F. Müller, 1776 - syn of: Sclerodoris tuberculata C.N.E. Eliot, 1904 - (DISCODORIDIDAE)
- obvelata, Platydoris obvelata O. Fabricius, 1797 - syn of: Platydoris argo (C. Linnaeus, 1767) - (DISCODORIDIDAE)
- obvelata, Doris obvelata O.F. Müller, 1776 - syn of: Cadlina laevis (C. Linnaeus, 1767) - (DORIDIDAE)
- obvelata, Doris obvelata G. Johnston, 1838 - syn of: Jorunna tomentosa (G.L.C.F.D. Cuvier, 1804) - (DORIDIDAE)
- obvelata nubilis, Monetaria obvelata nubilis G.R. Sulliotti, 1924 - (CYPRAEIDAE)
- obvelatum, Buccinum obvelatum G.P. Deshayes in E.S.J.L. de Laborde & M. Linant, 1834 - syn of: Nassarius arcularia plicatus (P.F. Röding, 1798) - (BUCCINIDAE)
- obvelatus, Nassarius obvelatus G.P. Deshayes, 1834 - syn of: Nassarius arcularia (C. Linnaeus, 1758) - (NASSARIIDAE)
- obversa, Carditamera obversa O.A.L. Mörch, 1861 - syn of: Carditamera radiata (Sowerby, 1833) - (CARDITIDAE)
- obversa, Iberus obversa I. von Born, 1788 - syn of: Iberus gualtieranus (C. Linnaeus, 1758) - (HELICIDAE)
- obvia, Helicella obvia (K.T. Menke, 1828) - (HYGROMIIDAE)
- obvia, Holmitheca obvia A.V. Sysoev, 1968 † - (TETRATHECIDAE) (FOSSIL)
- obvia erdelii, Helicella obvia erdelii K.T. Menke, 1828 - (HYGROMIIDAE)
- obvia pappi, Helicella obvia pappi H. Schütt, 1962 - (HYGROMIIDAE)
- obvoluta, Amphibola obvoluta I.H. Jonas, 1846 - syn of: Amphibola crenata (J.F. Gmelin, 1791) - (AMPHIBOLIDAE)
- obvoluta, Helicodonta obvoluta (O.F. Müller, 1774) - (HELICODONTIDAE)
- obvoluta, Moerchia obvoluta A. Adams, 1860 - (PYRAMIDELLIDAE)
- obvoluta, Rissoina obvoluta (A. Adams, 1860) - (RISSOINIDAE)
- obvoluta, Zilchistrophia obvoluta (F. Haas, 1949) - (SCOLODONTIDAE)
- obvoluta, Morchiella obvoluta (A. Adams, 1870) - (TORNIDAE)
- obvoluta, Anodonta obvoluta K.T. Menke, 1830 - syn of: Anodonta cygnea (C. Linnaeus, 1758) - (UNIONIDAE)
- obvoluta albanica, Helicodonta obvoluta albanica A.J. Wagner, 1914 - (HELICODONTIDAE)
- obvoluta bosniaca, Helicodonta obvoluta bosniaca (O. Böttger, 1885) - (HELICODONTIDAE)
- obvoluta calabrica, Helicodonta obvoluta calabrica E. Degner, 1927 - (HELICODONTIDAE)
- obvoluta dentata, Helicodonta obvoluta dentata (C.A. Westerlund, 1876) - (HELICODONTIDAE)
- obvolutus, Malleus obvolutus L. de Folin in L. de Folin & J.P.L. Périer, 1867 - syn of: Malleus regula (P. Forsskål in C. Niebuhr, 1775) - (MALLEIDAE)
- Obwerukunio, Genus Obwerukunio D. Van Damme & G.E. Pickford, 2010 (UNIONIDAE)
- ocalana, Pseudodostia ocalana G.J. Vermeij & R. Portell, 2013 † - (NERITIDAE) (FOSSIL)
- ocalanus, Pseudomiltha ocalanus W.H. Dall, 1903 † - (LUCINIDAE) (FOSSIL)
- ocalensis, Nayadina ocalensis (F.S. MacNeil, 1934 †) - (ELIGMIDAE) (FOSSIL)
- ocalensis, Vulsella ocalensis F.S. MacNeil, 1934 † - syn of: Nayadina ocalensis (F.S. MacNeil, 1934 †) - (PTERIIDAE) (FOSSIL)
- ocalis, Belgrandiella ocalis H.D. Boeters, 2008 - (HYDROBIIDAE)
- ocalum, Amusium ocalum W.H. Dall † - (PECTINIDAE) (FOSSIL)
- Ocana, syn of: Genus Lunella P.F. Röding, 1798 (TURBINIDAE)
- ocana, Holospira ocana P. Bartsch, 1906 - (UROCOPTIDAE)
- ocanensis, Pomacea ocanensis (W. Kobelt, 1914) - (AMPULLARIIDAE)
- ocarina, Granulina ocarina F. Fernandes, 1987 - (MARGINELLIDAE)
- occa, Murex occa G.B. II Sowerby, 1834 - (MURICIDAE)
- occa, Pinctada occa L.A. Reeve, 1857 - syn of: Pinctada imbricata P.F. Röding, 1798 - (PTERIIDAE)
- occabus, Microptychis occabus Hoare & Sturgeon, 1981 † - (PSEUDOZYGOPLEURIDAE) (FOSSIL)
- occaecata, Neptunea occaecata K. Fraussen & Y. Terryn, 2007 - (BUCCINIDAE)
- occasa, Keeneia occasa E.M. Fletcher 1958 † - (PLATYCERATIDAE) (FOSSIL)
- occasiuncula, Bythinella occasiuncula H.D. Boeters & G. Falkner, 2001 - (BYTHINELLIDAE)
- occasiuncula, Bankia occasiuncula T. Iredale, 1932 - syn of: Bankia australis (W.T. Calman, 1920) - (TEREDINIDAE)
- occata, Diptychophlia occata (R.B. Hinds, 1843) - (BORSONIIDAE)
- occata, Juga occata (R.B. Hinds, 1844) - (SEMISULCOSPIRIDAE)
- occata, Melanoides occata R.B. Hinds - (THIARIDAE)
- occata, Radiatula occata (I. Lea, 1860) - (UNIONIDAE)
- occatilla, Semele occatilla J.C. Melvill, 1901 - syn of: Semele striata (L.A. Reeve, 1853) - (SEMELIDAE)
- Occenebra, syn of: Genus Ocenebra J.E. Gray, 1847 (MURICIDAE)
- occidanea, Leptochondria occidanea (F.B. Meek, 1877 †) - (LEIOPECTINIDAE) (FOSSIL)
- occidaneus, Aviculopecten occidaneus F.B. Meek, 1877 † - syn of: Leptochondria occidanea (F.B. Meek, 1877 †) - (AVICULOPECTINIDAE) (FOSSIL)
- occidaneus, Allodiscus occidaneus B.A. Marshall & G.M. Barker, 2008 - (CHAROPIDAE)
- occidens, Corbicula occidens G.P. Deshayes, 1854 - syn of: Corbicula striatella G.P. Deshayes, 1854 - (CYRENIDAE)
- occidens, Fissurella occidens A.A. Gould, 1846 - syn of: Fissurella peruviana occidens A.A. Gould, 1846 - (FISSURELLIDAE)
- occidens, Fissurella peruviana occidens A.A. Gould, 1846 - (FISSURELLIDAE)
- occidens, Orthonychia occidens Walcott, 1884 † - (ORTHONYCHIIDAE) (FOSSIL)
- occidens, Phanerotrema occidens (J.W. Hall, 1867 †) - (PHANEROTREMATIDAE) (FOSSIL)
- occidens, Pleurotomaria occidens J.W. Hall, 1867 † - syn of: Phanerotrema occidens (J.W. Hall, 1867 †) - (PLEUROTOMARIIDAE) (FOSSIL)
- occidens, Gari occidens (J.F. Gmelin, 1791) - (PSAMMOBIIDAE)
- occidens, Solen occidens J.F. Gmelin, 1791 - syn of: Gari occidens (J.F. Gmelin, 1791) - (SOLENIDAE)
- occidens, Spondylus occidens G.B. III Sowerby, 1903 - (SPONDYLIDAE)
- occidens, Anticlimax occidens H.A. Pilsbry & A.A. Olsson, 1952 - (TORNIDAE)
- occidens jamarci, Spondylus occidens jamarci T.A. Okutani, 1983 - (SPONDYLIDAE)
- occidens mireilleae, Spondylus occidens mireilleae K.L. Lamprell & J.M. Healy, 2001 - syn of: Spondylus mireilleae K.L. Lamprell & J.M. Healy, 2001 - (SPONDYLIDAE)
- occidentale, Sharpeiceras occidentale Benavides-Caceres, 1956 † - syn of: Sharpeiceras florencae Spath, 1925 † - (ACANTHOCERATIDAE) (FOSSIL)
- occidentale, Deroceras occidentale (A.V. Grossu & D. Lupu, 1966) - (AGRIOLIMACIDAE)
- occidentale, Euhystrichoceras occidentale Reyment, 1955 † - (BRANCOCERATIDAE) (FOSSIL)
- occidentale, Caecum occidentale (P. Bartsch, 1920) - (CAECIDAE)
- occidentale, Fartulum occidentale P. Bartsch, 1920 - syn of: Caecum occidentale (P. Bartsch, 1920) - (CAECIDAE)
- occidentale, Calliostoma occidentale (J.W. Mighels & C.B. Adams, 1842) - (CALLIOSTOMATIDAE)
- occidentale, Leconteia occidentale Smith 1927 † - (CLIONITITIDAE) (FOSSIL)
- occidentale, Herringtonium occidentale J. Lewis, 1856 - syn of: Sphaerium occidentale (J. Lewis, 1856) - (CORBULIDAE)
- occidentale, Adelopoma occidentale (R.J.L. Guppy, 1872) - (DIPLOMMATINIDAE)
- occidentale, Alpenoceras occidentale (J.J.F. Whiteaves, 1890 †) - (DISCOSORIDAE) (FOSSIL)
- occidentale, Carychium occidentale H.A. Pilsbry, 1891 - (ELLOBIIDAE)
- occidentale, Epitonium occidentale (P. Nyst, 1871) - (EPITONIIDAE)
- occidentale, Siphonodentalium occidentale J. Henderson, 1920 - syn of: Pulsellum occidentale (J. Henderson, 1920) - (GADILIDAE)
- occidentale, Gastrioceras occidentale Miller & M.J. Faber, 1892 † - (GASTRIOCERATIDAE) (FOSSIL)
- occidentale, Acutimitoceras occidentale Bockwinkel & Ebbighausen, 2006 † - (GATTENDORFIIDAE) (FOSSIL)
- occidentale, Neoglyphioceras occidentale Kullmann, 1961 † - (GONIATITIDAE) (FOSSIL)
- occidentale, Gonioceras occidentale J.W. Hall, 1847 † - (GONIOCERATIDAE) (FOSSIL)
- occidentale, Protogrammoceras occidentale Dommergues, 1982 † - (HILDOCERATIDAE) (FOSSIL)
- occidentale, Bollandoceras occidentale W. Korn & Titus, 2011 † - (MAXIGONIATITIDAE) (FOSSIL)
- occidentale, Coralliophila occidentale S. Kosuge & C. Fernández, 1988 - (MURICIDAE)
- occidentale, Dacrydium occidentale E.A. Smith, 1885 - (MYTILIDAE)
- occidentale, Onchidium occidentale L. Guilding, 1825 - syn of: Vaginulus occidentalis (L. Guilding, 1825) - (ONCHIDIIDAE)
- occidentale, Cyrtoceras occidentale J.J.F. Whiteaves, 1890 † - syn of: Alpenoceras occidentale (J.J.F. Whiteaves, 1890 †) - (ONCOCERIDA (unassigned)) (FOSSIL)
- occidentale, Xolotrema occidentale H.A. Pilsbry & J.H. Ferriss, 1907 - (POLYGYRIDAE)
- occidentale, Rhytidopoma occidentale C. de la Torre & P. Bartsch, 1941 - (POMATIIDAE)
- occidentale, Chondropoma poeyanum occidentale C. de la Torre & P. Bartsch, 1938 - (POMATIIDAE)
- occidentale, Psiloceras occidentale Frebold, 1967 † - syn of: Badouxia canadensis (Frebold, 1951 †) - (PSILOCERATIDAE) (FOSSIL)
- occidentale, Leptodesma occidentale Girty, 1927 † - (PTERINEIDAE) (FOSSIL)
- occidentale, Actinodesma occidentale J.W. Hall † - (PTERINEIDAE) (FOSSIL)
- occidentale, Glyptodesma occidentale J.W. Hall † - syn of: Actinodesma occidentale J.W. Hall † - (PTERINEIDAE) (FOSSIL)
- occidentale, Pulsellum occidentale (J. Henderson, 1920) - (PULSELLIDAE)
- occidentale, Cymatium occidentale O.A.L. Mörch, 1877 - syn of: Septa occidentalis O.A.L. Mörch, 1877 - (RANELLIDAE)
- occidentale, Sphaerium occidentale (J. Lewis, 1856) - (SPHAERIIDAE)
- occidentale, Pisidium occidentale W. Newcomb, 1861 - syn of: Pisidium casertanum (Poli, 1791) - (SPHAERIIDAE)
- occidentale, Cyclas occidentale J. Lewis, 1856 - syn of: Sphaerium occidentale (J. Lewis, 1856) - (SPHAERIIDAE)
- occidentale, Tainoceras occidentale (Swallow, 1858 †) - (TAINOCERATIDAE) (FOSSIL)
- occidentale, Vaginulus occidentale L. Guilding, 1825 - syn of: Vaginulus occidentalis (L. Guilding, 1825) - (VERONICELLIDAE)
- occidentale amphibium, Sphaerium occidentale amphibium V. Sterki, 1907 - syn of: Sphaerium occidentale (J. Lewis, 1856) - (SPHAERIIDAE)
- occidentale aurita, Epitonium occidentale aurita (O.A.L. Mörch, 1875) - (EPITONIIDAE)
- occidentale sulcatum, Dentalium occidentale sulcatum A.E. Verrill, 1884 - syn of: Antalis occidentalis (W. Stimpson, 1851) - (DENTALIIDAE)
- occidentalis, Tornatellaria occidentalis H.A. Pilsbry & C.M. Cooke, 1916 - (ACHATINELLIDAE)
- occidentalis, Partulina dwightii occidentalis H.A. Pilsbry & C.M. Cooke, 1914 - (ACHATINELLIDAE)
- occidentalis, Achatina occidentalis H.A. Pilsbry, 1904 - (ACHATINIDAE)
- occidentalis, Aclis occidentalis (H. Hemphill, 1894) - (ACLIDIDAE)
- occidentalis, Aeolidiella occidentalis L.S.R. Bergh, 1875 - (AEOLIDIIDAE)
- occidentalis, Leptachatina nitida occidentalis C.M. Cooke, 1910 - (AMASTRIDAE)
- occidentalis, Byssopteria occidentalis Fenton & Fenton, 1924 † - (AMBONYCHIIDAE) (FOSSIL)
- occidentalis, Pila occidentalis A. Mousson, 1887 - (AMPULLARIIDAE)
- occidentalis, Antillocaprina occidentalis (Whtifield) † - (ANTILLOCAPRINIDAE) (FOSSIL)
- occidentalis, Arrhoges occidentalis (H.H. Beck, 1836) - (APORRHAIDAE)
- occidentalis, Arca occidentalis R.A. Philippi, 1847 - syn of: Arca zebra occidentalis R.A. Philippi, 1847 - (ARCIDAE)
- occidentalis, Arca zebra occidentalis R.A. Philippi, 1847 - (ARCIDAE)
- occidentalis, Aviculopecten occidentalis (Shumard, 1855 †) - (AVICULOPECTINIDAE) (FOSSIL)
- occidentalis, Baculites occidentalis F.B. Meek, 1862 † - (BACULITIDAE) (FOSSIL)
- occidentalis, Frechites occidentalis (Smith, 1914 †) - (BEYRICHITIDAE) (FOSSIL)
- occidentalis, Euhadra senckenbergiana occidentalis M. Azuma, M. Tatewaki & S. Okamura, 1987 - (BRADYBAENIDAE)
- occidentalis, Drymaeus occidentalis K. Miller, 1879 - (BULIMULIDAE)
- occidentalis, Bulla occidentalis A. Adams, 1850 - (BULLIDAE)
- occidentalis, Trochita occidentalis Gray, 1850 † - (CALYPTRAEIDAE) (FOSSIL)
- occidentalis, Baudinella occidentalis F. Köhler, 2011 - (CAMAENIDAE)
- occidentalis, Nipponochloritis occidentalis M. Azuma, 1982 - (CAMAENIDAE)
- occidentalis, Mouldingia occidentalis G.A. Solem, 1984 - (CAMAENIDAE)
- occidentalis, Caprina occidentalis T.A. Conrad, 1855 † - syn of: Neokimbleia planata (T.A. Conrad, 1855 †) - (CAPRINIDAE) (FOSSIL)
- occidentalis, Caprinula occidentalis T.A. Conrad, 1855 † - syn of: Neokimbleia planata (T.A. Conrad, 1855 †) - (CAPRINULIDAE) (FOSSIL)
- occidentalis, Icuncula occidentalis N.H. Ludbrook, 1978 † - (CAPULIDAE) (FOSSIL)
- occidentalis, Cyclocardia occidentalis (T.A. Conrad, 1855 †) - (CARDITIDAE) (FOSSIL)
- occidentalis, Diacria schmidti occidentalis Leyen & S. Van Der Spoel, 1982 - (CAVOLINIIDAE)
- occidentalis, Cavolinia tridentata occidentalis W.H. Dall, 1908 - (CAVOLINIIDAE)
- occidentalis, Ceratites occidentalis Smith, 1914 † - syn of: Frechites occidentalis (Smith, 1914 †) - (CERATITIDAE) (FOSSIL)
- occidentalis, Alabina occidentalis (H. Hemphill, 1894) - (CERITHIIDAE)
- occidentalis, Onithochiton occidentalis (A.A. Gould, 1846) - (CHITONIDAE)
- occidentalis, Abida occidentalis P. Fagot, 1888 - (CHONDRINIDAE)
- occidentalis, Clathurella occidentalis L.A. Reeve, 1846 - syn of: Rimosodaphnella morra (W.H. Dall, 1881) - (CLATHURELLIDAE)
- occidentalis, Alopia occidentalis O. Böttger, 1879 - syn of: Alopia microstoma M. von Kimakowicz, 1883 - (CLAUSILIIDAE)
- occidentalis, Serrulina sieversi occidentalis I.M. Likharev, 1962 - (CLAUSILIIDAE)
- occidentalis, Montenegrina perstriata occidentalis H. Nordsieck, 1977 - (CLAUSILIIDAE)
- occidentalis, Macedonica frauenfeldi occidentalis S.G.A. Jaeckel, 1954 - (CLAUSILIIDAE)
- occidentalis, Armenica disjuncta occidentalis E. Neubert & H.P.M.G. Menkhorst, 1994 - (CLAUSILIIDAE)
- occidentalis, Surcula occidentalis Woods, 1922 † - (CLAVATULIDAE) (FOSSIL)
- occidentalis, Clio occidentalis W.H. Dall, 1871 - syn of: Clio pyramidata C. Linnaeus, 1767 - (CLIIDAE)
- occidentalis, Cochlicella conoidea occidentalis P.M. Pallary, 1897 - (COCHLICELLIDAE)
- occidentalis, Heleobia occidentalis (A. Doering, 1884) - (COCHLIOPIDAE)
- occidentalis, Collonia occidentalis W.D. Smith, 1927 † - (COLLONIIDAE) (FOSSIL)
- occidentalis, Homalopoma occidentalis (A.E.M. Cossmann, 1903 †) - (COLLONIIDAE) (FOSSIL)
- occidentalis, Conus occidentalis C. Linnaeus, 1758 - syn of: Leptoconus ammiralis (C. Linnaeus, 1758) - (CONIDAE)
- occidentalis, Neocryptaulax occidentalis Stanton, 1895 † - syn of: Hokkaidoconcha occidentalis (Stanton, 1895 †) - (CRYPTAULACIDAE) (FOSSIL)
- occidentalis, Bullaria occidentalis Adams, 1850 † - syn of: Bulla stampinensis A.E.M. Cossmann, 1879 † - (CYLICHNIDAE) (FOSSIL)
- occidentalis, Notocypraea piperita occidentalis (T. Iredale, 1935) - (CYPRAEIDAE)
- occidentalis, Gibberula occidentalis T. McCleery, 2008 - (CYSTISCIDAE)
- occidentalis, Antalis occidentalis (W. Stimpson, 1851) - (DENTALIIDAE)
- occidentalis, Anguispira kochi occidentalis E.C. Von Martens, 1882 - (DISCIDAE)
- occidentalis, Dreissena occidentalis É.A.A. Locard, 1893 - syn of: Dreissena polymorpha (P.S. Pallas, 1771) - (DREISSENIDAE)
- occidentalis, Everettia occidentalis T.S. Liew, M. Schilthuizen & J.J. Vermeulen, 2009 - (DYAKIIDAE)
- occidentalis, Microtralia occidentalis (L. Pfeiffer, 1854) - (ELLOBIIDAE)
- occidentalis, Leuconia occidentalis L. Pfeiffer, 1854 - syn of: Microtralia ovulum (L. Pfeiffer, 1840) - (ELLOBIIDAE)
- occidentalis, Mautodontha occidentalis A.F. Sartori, O. Gargominy & Fontaine, 2014 - (ENDODONTIDAE)
- occidentalis, Eubranchus occidentalis F.M. MacFarland, 1966 - syn of: Eubranchus rustyus (Er. Marcus, 1961) - (EUBRANCHIDAE)
- occidentalis, Dondice occidentalis (H. Engel, 1925) - (FACELINIDAE)
- occidentalis, Glacidorbis occidentalis Bunn & D.R. Stoddart, 1983 - (GLACIDORBIDAE)
- occidentalis, Fayettevillea occidentalis Ruzhentsev & Bogoslovskaya, 1971 † - (GLAPHYRITIDAE) (FOSSIL)
- occidentalis, Halobia occidentalis J.J.F. Whiteaves, 1889 † - syn of: Chuluaria occidentalis (J.J.F. Whiteaves, 1889 †) - (HALOBIIDAE) (FOSSIL)
- occidentalis, Andangularia occidentalis A. Nützel & Erwin, 2004 † - (HARPIDAE) (FOSSIL)
- occidentalis, Helicina occidentalis L. Guilding, 1828 - (HELICINIDAE)
- occidentalis, Holopea occidentalis Nicholson, 1872 † - (HOLOPEIDAE) (FOSSIL)
- occidentalis, Pseudosonneratia occidentalis Casey † - (HOPLITIDAE) (FOSSIL)
- occidentalis, Mauidrillia occidentalis P.A. Maxwell, 1988 † - (HORAICLAVIDAE) (FOSSIL)
- occidentalis, Belgrandia occidentalis S. Clessin, 1887 - syn of: Belgrandia lusitanica (A. Paladilhe, 1867) - (HYDROBIIDAE)
- occidentalis, Elbasania occidentalis (P. Subai, 1999) - (HYGROMIIDAE)
- occidentalis, Trichia occidentalis J. Castillejo, 1986 - (HYGROMIIDAE)
- occidentalis, Harmozica occidentalis B. Hausdorf, 2004 - (HYGROMIIDAE)
- occidentalis, Monacha occidentalis A. Bofill & F. Haas, 1919 - syn of: Monacha granulata (J. Alder, 1830) - (HYGROMIIDAE)
- occidentalis, Ponentina occidentalis C.A. Récluz, 1845 - syn of: Ponentina subvirescens (J.C. Bellamy, 1839) - (HYGROMIIDAE)
- occidentalis, Permophorus occidentalis (F.B. Meek & Hayden, 1865 †) - (KALENTERIDAE) (FOSSIL)
- occidentalis, Stutchburia occidentalis F.B. Meek & Hayden, 1865 † - syn of: Permophorus occidentalis (F.B. Meek & Hayden, 1865 †) - (KALENTERIDAE) (FOSSIL)
- occidentalis, Timanites occidentalis Miller & Warren, 1936 † - syn of: Timanites keyserlingi Miller & Warren, 1936 † - (KOENENITIDAE) (FOSSIL)
- occidentalis, Pythinella occidentalis (E.A. Smith, 1885) - (LASAEIDAE)
- occidentalis, Lytopelte occidentalis A.V. Grossu & D. Lupu, 1966 - syn of: Deroceras occidentale (A.V. Grossu & D. Lupu, 1966) - (LIMACIDAE)
- occidentalis, Limopsis occidentalis B.C. Cotton, 1930 - (LIMOPSIDAE)
- occidentalis, Lottia occidentalis L.A. Reeve, 1855 - syn of: Lottia leucopleura (J.F. Gmelin, 1791) - (LOTTIIDAE)
- occidentalis, Lucina occidentalis T. Nagao, 1930 † - syn of: Miltha amakusensis Tashiro, 1976 † - (LUCINIDAE) (FOSSIL)
- occidentalis, Palaeoneilo occidentalis Guskov & Demskaja, 1984 † - (MALLETIIDAE) (FOSSIL)
- occidentalis, Serrata occidentalis F. Boyer, 2008 - (MARGINELLIDAE)
- occidentalis, Thaumastus occidentalis W.K. Weyrauch, 1960 - (MEGASPIRIDAE)
- occidentalis, Popovites occidentalis Tozer, 1965 † - (MELAGATHICERATIDAE) (FOSSIL)
- occidentalis, Murchisonella occidentalis (H. Hemphill, 1894) - (MURCHISONELLIDAE)
- occidentalis, Nassarius turbinellus occidentalis M.A. Peyrot, 1924 † - (NASSARIIDAE) (FOSSIL)
- occidentalis, Nautilus occidentalis Swallow, 1860 † - (NAUTILIDAE) (FOSSIL)
- occidentalis, Nerinea occidentalis Stanton, 1947 † - (NERINEIDAE) (FOSSIL)
- occidentalis, Clidophorus occidentalis F.B. Meek & Hayden, 1865 † - syn of: Permophorus occidentalis (F.B. Meek & Hayden, 1865 †) - (NUCULANIDAE) (FOSSIL)
- occidentalis, Octopus occidentalis J.J.S. Steenstrup in W.E. Hoyle, 1885 - (OCTOPODIDAE)
- occidentalis, Liguus fasciatus occidentalis C. de la Torre - (ORTHALICIDAE)
- occidentalis, Neithea occidentalis (T.A. Conrad, 1855 †) - (PECTINIDAE) (FOSSIL)
- occidentalis, Pecten occidentalis Shumard, 1855 † - syn of: Aviculopecten occidentalis (Shumard, 1855 †) - (PECTINIDAE) (FOSSIL)
- occidentalis, Pholadomya occidentalis Morton, 1833 † - (PHOLADOMYIDAE) (FOSSIL)
- occidentalis, Physa occidentalis G.W. Tryon, 1865 - (PHYSIDAE)
- occidentalis, Planorbella occidentalis J.G. Cooper, 1870 - (PLANORBIDAE)
- occidentalis, Biomphalaria occidentalis W.L. Paraense, 1981 - (PLANORBIDAE)
- occidentalis, Ferrissia occidentalis B. Walker, 1924 - syn of: Ferrissia walkeri (H.A. Pilsbry & J.H. Ferriss, 1907) - (PLANORBIDAE)
- occidentalis, Helisoma newberryi occidentalis G.D. Hanna, 1924 - (PLANORBIDAE)
- occidentalis, Triopha occidentalis (J.W. Fewkes, 1889) - (POLYCERIDAE)
- occidentalis, Triodopsis occidentalis H.A. Pilsbry & J.H. Ferriss, 1907 - syn of: Xolotrema occidentale H.A. Pilsbry & J.H. Ferriss, 1907 - (POLYGYRIDAE)
- occidentalis, Opisthosiphon vaughani occidentalis P. Bartsch, 1946 - (POMATIIDAE)
- occidentalis, Potamides occidentalis N.H. Woods in Bosworth, 1922 † - (POTAMIDIDAE) (FOSSIL)
- occidentalis, Stenopronorites occidentalis Kullmann, 1962 † - (PRONORITIDAE) (FOSSIL)
- occidentalis, Hokkaidoconcha occidentalis (Stanton, 1895 †) - (PROVANNIDAE) (FOSSIL)
- occidentalis, Pseudomonotis occidentalis J.J.F. Whiteaves, 1889 † - syn of: Chuluaria occidentalis (J.J.F. Whiteaves, 1889 †) - (PSEUDOMONOTIDAE) (FOSSIL)
- occidentalis, Euphyllites occidentalis Guex, 1980 † - (PSILOCERATIDAE) (FOSSIL)
- occidentalis, Chuluaria occidentalis (J.J.F. Whiteaves, 1889 †) - (PTERINOPECTINIDAE) (FOSSIL)
- occidentalis, Ptychatractus occidentalis R.E.C. Stearns, 1873 - (PTYCHATRACTIDAE)
- occidentalis, Brachystomia occidentalis (L. Gougerot, 1981 †) - (PYRAMIDELLIDAE) (FOSSIL)
- occidentalis, Eulimella occidentalis H. Hemphill, 1894 - syn of: Murchisonella occidentalis (H. Hemphill, 1894) - (PYRAMIDELLIDAE)
- occidentalis, Septa occidentalis O.A.L. Mörch, 1877 - (RANELLIDAE)
- occidentalis, Gyrineum lessonae occidentalis A.E.M. Cossmann & M.A. Peyrot, 1923 † - (RANELLIDAE) (FOSSIL)
- occidentalis, Annabellia occidentalis M. Shea & R.J. Griffiths, 2010 - (RHYTIDIDAE)
- occidentalis, Sagda occidentalis H.B. Baker, 1935 - (SAGDIDAE)
- occidentalis, Schizodus occidentalis Reed, 1930 † - (SCHIZODIDAE) (FOSSIL)
- occidentalis, Seguenzia occidentalis W.H. Dall, 1908 - (SEGUENZIIDAE)
- occidentalis, Solemya occidentalis G.P. Deshayes, 1857 - (SOLEMYIDAE)
- occidentalis, Solemya occidentalis E. de C. Rios, 1985 - syn of: Solemya notialis L.R.L. Simone, 2009 - (SOLEMYIDAE)
- occidentalis, Solemya occidentalis Stanton, 1895 † - syn of: Acharax stantoni (E.H. Vokes, 1955 †) - (SOLEMYIDAE) (FOSSIL)
- occidentalis, Pseudosubulina berendti occidentalis (H.A. Pilsbry, 1899) - (SPIRAXIDAE)
- occidentalis, Haploptychius occidentalis (P.M. Heude, 1874) - (STREPTAXIDAE)
- occidentalis, Cymatoica occidentalis W.H. Dall, 1890 - syn of: Cymatoica undulata (S.C.T. Hanley, 1844) - (TELLINIDAE)
- occidentalis, Tethys occidentalis (N.H. Odhner, 1936) - (TETHYDIDAE)
- occidentalis, Circulus occidentalis H.A. Pilsbry & A.A. Olsson, 1941 † - (TORNIDAE) (FOSSIL)
- occidentalis, Marionia occidentalis L.S.R. Bergh, 1884 - syn of: Marionia cucullata (J.P.Y. Couthouy, 1852) - (TRITONIIDAE)
- occidentalis, Cleotrivia occidentalis (F.A. Schilder, 1922) - (TRIVIIDAE)
- occidentalis, Trochus occidentalis J.W. Mighels & C.B. Adams, 1842 - syn of: Calliostoma occidentale (J.W. Mighels & C.B. Adams, 1842) - (TROCHIDAE)
- occidentalis, Tropites occidentalis Smith, 1904 † - syn of: Tropites dilleri Smith, 1904 † - (TROPITIDAE) (FOSSIL)
- occidentalis, Pleurotoma occidentalis L.A. Reeve, 1846 - syn of: Rimosodaphnella morra (W.H. Dall, 1881) - (TURRIDAE)
- occidentalis, Ptychobranchus occidentalis (T.A. Conrad, 1836) - (UNIONIDAE)
- occidentalis, Unio occidentalis J.R. Bourguignat, 1889 - syn of: Unio arcuatus N.R. Bouchard-Chantereaux, 1838 - (UNIONIDAE)
- occidentalis, Dipsas occidentalis P.M. Heude, 1885 - syn of: Cristaria plicata (W.E. Leach, 1815) - (UNIONIDAE)
- occidentalis, Cochlodinella variegata occidentalis C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- occidentalis, Pachymyonia occidentalis Dickins, 1957 † - (VACUNELLIDAE) (FOSSIL)
- occidentalis, Macromphalina occidentalis P. Bartsch, 1907 - (VANIKORIDAE)
- occidentalis, Vasseuria occidentalis Munier & Chalmas, 1880 † - (VASSEURIDAE) (FOSSIL)
- occidentalis, Dosinia occidentalis N.H. Ludbrook, 1978 † - (VENERIDAE) (FOSSIL)
- occidentalis, Turtonia occidentalis W.H. Dall, 1871 - syn of: Turtonia minuta (O. Fabricius, 1780) - (VENERIDAE)
- occidentalis, Tapes occidentalis L.A. Reeve, 1864 - syn of: Marcia recens (H.S. Holten, 1802) - (VENERIDAE)
- occidentalis, Vaginulus occidentalis (L. Guilding, 1825) - (VERONICELLIDAE)
- occidentalis, Veronicella occidentalis L. Pfeiffer, 1854 - syn of: Veronicella cubensis (L. Pfeiffer, 1840) - (VERONICELLIDAE)
- occidentalis, Vertigo occidentalis V. Sterki, 1907 - (VERTIGINIDAE)
- occidentalis, Lioplax occidentalis H.A. Pilsbry, 1935 - (VIVIPARIDAE)
- occidentalis, Hypsipleura occidentalis Stanton, 1895 † - syn of: Hokkaidoconcha occidentalis (Stanton, 1895 †) - (ZYGOPLEURIDAE) (FOSSIL)
- occidentalis aurita, Epitonium occidentalis aurita O.A.L. Mörch, 1875 - syn of: Epitonium occidentale (P. Nyst, 1871) - (EPITONIIDAE)
- occidentalis beui, Septa occidentalis beui F. García-Talavera, 1985 - (RANELLIDAE)
- occidentalis debilisculptus, Thaumastus occidentalis debilisculptus W.K. Weyrauch, 1960 - (MEGASPIRIDAE)
- occidentalis labradorensis, Arrhoges occidentalis labradorensis (C.W. Johnson, 1930) - (APORRHAIDAE)
- occidentalis pura, Trochus occidentalis pura J.G. Jeffreys, 1865 - syn of: Calliostoma occidentale (J.W. Mighels & C.B. Adams, 1842) - (TROCHIDAE)
- occidentalis sasamorii, Ptychatractus occidentalis sasamorii (J.T. Kuroda, 1943) - (PTYCHATRACTIDAE)
- Occidentella, syn of: Genus Onchidella J.E. Gray, 1850 (ONCHIDIIDAE)
- occidentiformis, Corbicula occidentiformis R.A.M. Brandt, 1974 - (CYRENIDAE)
- Occidentocerithium, Genus Occidentocerithium Nützel & al., 2003 † (CERITHIIDAE) (FOSSIL)
- occidua, Cuspidaria occidua B.C. Cotton, 1931 - (CUSPIDARIIDAE)
- occidua, Cerodrillia occidua P.J. Fallon, 2016 - (DRILLIIDAE)
- occidua, Diodora occidua B.C. Cotton, 1930 - (FISSURELLIDAE)
- occidua, Cheilea occidua B.C. Cotton, 1935 - (HIPPONICIDAE)
- occidua, Divaricella occidua (B.C. Cotton & F.C. Godfrey, 1938) - (LUCINIDAE)
- occidua, Volvarina occidua (B.C. Cotton, 1944) - (MARGINELLIDAE)
- occidua, Pagodula occidua B.A. Marshall & R. Houart, 2011 - (MURICIDAE)
- occidua, Vema occidua B.A. Marshall, 2006 - (NEOPILINIDAE)
- occidua, Alvania occidua (B.C. Cotton, 1944) - (RISSOIDAE)
- occidua, Ascorhis occidua W.F. Ponder & K.B. Clark, 1988 - (TATEIDAE)
- occidua, Viriolopsis occidua B.A. Marshall, 1983 - (TRIPHORIDAE)
- occidua, Archimediella occidua (B.C. Cotton & N.H. Woods, 1935) - (TURRITELLIDAE)
- occidua, Notovoluta occidua B.C. Cotton, 1946 - (VOLUTIDAE)
- occiduale, Phylloceras occiduale Canavari, 1882 † - (PHYLLOCERATIDAE) (FOSSIL)
- occidualis, Suturoglypta occidualis J. Espinosa & J.A. Ortea, 2013 - (COLUMBELLIDAE)
- occiduum, Pachycrommium occiduum K.V.W. Palmer, 1953 † - (AMPULLINIDAE) (FOSSIL)
- occiduus, Callistochiton occiduus E.A. Ashby & B.C. Cotton, 1934 - (CALLISTOPLACIDAE)
- occiduus, Clavus occiduus F.E. Wells, 1991 - (DRILLIIDAE)
- occiduus, Cadulus occiduus J.C. Verco, 1911 - (GADILIDAE)
- occiduus, Clanculus undatus occiduus (B.C. Cotton & F.C. Godfrey, 1934) - (TROCHIDAE)
- Occirhenea, Genus Occirhenea T. Iredale, 1933 (CAMAENIDAE)
- occitana, Thoralispira occitana Horný & Vizcaïno, 1995 † - (SINUITIDAE) (FOSSIL)
- occitanica, Diodora occitanica C.A. Récluz, 1843 - syn of: Diodora graeca (C. Linnaeus, 1758) - (FISSURELLIDAE)
- occitanica, Ocenebra occitanica A.E.M. Cossmann & M.A. Peyrot, 1923 † - (MURICIDAE) (FOSSIL)
- occitanica, Syndosmya occitanica C.A. Récluz in J.C. Chenu, 1844 - syn of: Abra alba (Wood, 1802) - (SEMELIDAE)
- occitanicus, Hoplites occitanicus O. von Retowski, 1893 † - syn of: Pseudoneocomites retowskyi (Sarasin & Schönderlmayer, 1901 †) - (HOPLITIDAE) (FOSSIL)
- occitanicus, Pseudoneocomites occitanicus (O. von Retowski, 1893 †) - (NEOCOMITIDAE) (FOSSIL)
- occludens, Catantostoma occludens J. Perner, 1907 † - syn of: Prokopelia occludens (J. Perner, 1907 †) - (CATANTOSTOMATIDAE) (FOSSIL)
- occludens, Prokopelia occludens (J. Perner, 1907 †) - (GOSSELETINIDAE) (FOSSIL)
- occlusa, Ampullaria occlusa P.H. Fischer & J.C.H. Crosse, 1890 - syn of: Pomacea flagellata (T. Say, 1829) - (AMPULLARIIDAE)
- occlusa, Anadara occlusa (L.A. Reeve, 1844) - (ARCIDAE)
- occlusa, Assyriella bellardii occlusa (A. Mousson, 1854) - (HELICIDAE)
- occlusa, Natica occlusa S.V. Wood † - (NATICIDAE) (FOSSIL)
- occlusa, Tropidophora occlusa (O.A.L. Mörch, 1852) - (POMATIIDAE)
- occlusa, Prolesophanta occlusa T. Iredale, 1933 - (RHYTIDIDAE)
- occlusum, Phyllopachyceras occlusum (Tate) † - (PHYLLOCERATIDAE) (FOSSIL)
- occlusus, Typhinellus occlusus (T.A. Garrard, 1963) - (MURICIDAE)
- occlusus, Tenagodus occlusus (Tenison Woods, 1877 †) - (SILIQUARIIDAE) (FOSSIL)
- occulata, Cylichna occulata J.W. Mighels & C.B. Adams, 1842 - syn of: Cylichna occulta (J.W. Mighels & Adams, 1842) - (CYLICHNIDAE)
- Occulator, syn of: Subgenus Happia (Happiella) F.C. Baker, 1925 (SCOLODONTIDAE)
- occulatum, Buccinum occulatum L.W. Dillwyn, 1817 - syn of: Terebra guttata (P.F. Röding, 1798) - (BUCCINIDAE)
- occulatus, Phyllonotus occulatus L.A. Reeve, 1845 - syn of: Phyllonotus oculatus (L.A. Reeve, 1845) - (MURICIDAE)
- occulta, Armina occulta Mehrotra, Caballer & Chavanich, 2017 - (ARMINIDAE)
- occulta, Assiminea occulta E. Rolán, 2013 - (ASSIMINEIDAE)
- occulta, Bulla occulta (J.W. Mighels & C.B. Adams, 1842) - syn of: Cylichna occulta (J.W. Mighels & Adams, 1842) - (BULLIDAE)
- occulta, Bulla occulta J.W. Mighels & C.B. Adams, 1842 - syn of: Cylichna occulta (J.W. Mighels & Adams, 1842) - (BULLIDAE)
- occulta, Crepipatella occulta Veliz, H. Winkler, Guisados & R. Collin, 2012 - (CALYPTRAEIDAE)
- occulta, Ptychodon occulta N.H. Odhner, 1921 - (CHAROPIDAE)
- occulta, Rupestrella occulta (E.A. Rossmässler, 1839) - (CHONDRINIDAE)
- occulta, Albinaria arcadica occulta H. Nordsieck, 2015 - (CLAUSILIIDAE)
- occulta, Alopia vicina occulta R. von Kimakowicz, 1931 - (CLAUSILIIDAE)
- occulta, Cylichna occulta (J.W. Mighels & Adams, 1842) - (CYLICHNIDAE)
- occulta, Ismaila occulta T.H. Ho, 1981 - syn of: Dendronotus iris J.G. Cooper, 1863 - (DENDRONOTIDAE)
- occulta, Eatoniella occulta W.F. Ponder, 1983 - (EATONIELLIDAE)
- occulta, Hendersonia occulta (T. Say, 1831) - (HELICINIDAE)
- occulta, Galba occulta M. Jackiewicz, 1959 - syn of: Ladislavella terebra (C.A. Westerlund, 1885) - (LYMNAEIDAE)
- occulta, Volvarina occulta J. Espinosa & J.A. Ortea, 2013 - (MARGINELLIDAE)
- occulta, Granulina occulta (T.A. de M. Monterosato, 1869) - (MARGINELLIDAE)
- occulta, Neolepetopsis occulta J.H. McLean, 1990 - (NEOLEPETOPSIDAE)
- occulta, Palaeomutela occulta Betekhtina † - (PALAEOMUTELIDAE) (FOSSIL)
- occulta, Haurakia occulta (K.H.J. Thiele, 1925) - (RISSOIDAE)
- occulta, Rissoina occulta Yokoyama, 1926 † - (RISSOINIDAE) (FOSSIL)
- occulta, Elliptio occulta (I. Lea, 1843) - (UNIONIDAE)
- occulta, Torrecoptis occulta (C. de la Torre, 1912) - (UROCOPTIDAE)
- occulta, Hendersoniella occulta (T. Say, 1831) - (UROCOPTIDAE)
- occulta, Dosinia occulta E. Fischer-Piette & D. Delmas, 1967 - syn of: Dosinia hepatica (J.B.P.A. Lamarck, 1818) - (VENERIDAE)
- occulta, Notovoluta kreuslerae occulta T.A. Darragh, 1988 † - (VOLUTIDAE) (FOSSIL)
- occulta densistriata, Cylichna occulta densistriata W. Leche, 1878 - syn of: Cylichnoides densistriata (W. Leche, 1878) - (CYLICHNIDAE)
- occulta gibilfunnensis, Rupestrella occulta gibilfunnensis (A. De Gregorio, 1895) - (CHONDRINIDAE)
- occulta greenfieldi, Torrecoptis occulta greenfieldi C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- occulta maculosa, Torrecoptis occulta maculosa C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- occultata, Campylaea planospira occultata (M. Paulucci, 1886) - (HELICIDAE)
- occultata, Anculosa occultata E.A. Smith, 1922 - (PLEUROCERIDAE)
- Occultator, syn of: Subgenus Happia (Happiella) F.C. Baker, 1925 (SCOLODONTIDAE)
- occultidens, Odostomia occultidens W.L. May, 1915 - (PYRAMIDELLIDAE)
- occultornatum, Sudeticeras occultornatum W. Korn & Ebbighausen, 2006 † - (ANTHRACOCERATIDAE) (FOSSIL)
- occultospira, Volvarina occultospira B.M. Landau, F. Da Silva & S.M. Heitz, 2016 † - (MARGINELLIDAE) (FOSSIL)
- occultum, Paracrioceras occultum (Seeley, 1865 †) - (ANCYLOCERATIDAE) (FOSSIL)
- occultum, Caecum occultum L. de Folin, 1867 - (CAECIDAE)
- occultum, Tragorhacoceras occultum (Mojsisovics, 1873 †) - (DISCOPHYLLITIDAE) (FOSSIL)
- occultum, Lychnoceras occultum P.A. Zhuravleva, 1974 † - syn of: Almaloceras abaeratum P.A. Zhuravleva, 1974 † - (ONCOCERIDA (unassigned)) (FOSSIL)
- occultum, Phylloceras occultum Mojsisovics, 1873 † - syn of: Tragorhacoceras occultum (Mojsisovics, 1873 †) - (PHYLLOCERATIDAE) (FOSSIL)
- occultum, Opisthocoelicum occultum (C. de la Torre & J. Henderson, 1921) - (POMATIIDAE)
- occultus, Fidelites occultus (Barrande, 1865 †) - (AGONIATITIDAE) (FOSSIL)
- occultus, Crioceras occultus Seeley, 1865 † - syn of: Paracrioceras occultum (Seeley, 1865 †) - (ANCYLOCERATIDAE) (FOSSIL)
- occultus, Arion occultus R. Anderson, 2004 - (ARIONIDAE)
- occultus, Bulimus occultus L.A. Reeve, 1849 - syn of: Bahiensis occultus (L.A. Reeve, 1849) - (BULIMULIDAE)
- occultus, Joculator occultus A. Cecalupo & I. Perugia, 2012 - (CERITHIOPSIDAE)
- occultus, Cyrtolites occultus J. Perner, 1903 † - (CYRTOLITIDAE) (FOSSIL)
- occultus, Goniatites occultus Barrande, 1865 † - syn of: Fidelites occultus (Barrande, 1865 †) - (GONIATITIDAE) (FOSSIL)
- occultus, Bahiensis occultus (L.A. Reeve, 1849) - (ODONTOSTOMIDAE)
- occultus, Proplanulites occultus Buckman † - (PERISPHINCTIDAE) (FOSSIL)
- occultus, Kurilipisidium occultus L.A. Prozorova, 1996 - syn of: Pisidium conventus S. Clessin, 1877 - (SPHAERIIDAE)
- occultus platypleura, Aphyllites occultus platypleura Frech, 1889 † - syn of: Foordites platypleura (Frech, 1889 †) - (MIMOCERATIDAE) (FOSSIL)
- oceana, Maclurites oceana Billings, 1865 † - (MACLURITIDAE) (FOSSIL)
- Oceanesia, Subgenus Liardetia (Oceanesia) F.C. Baker, 1938 (EUCONULIDAE)
- oceani, Ampullaria oceani Münster, 1840 † - (AMPULLARIIDAE) (FOSSIL)
- oceani, Crenipecten oceani (Goldfuss) † - (AVICULOPECTINIDAE) (FOSSIL)
- oceani, Harpagodes oceani (A. Brongniart, 1821 †) - (HARPAGODIDAE) (FOSSIL)
- oceani, Histioteuthis oceani (G.C. Robson, 1948) - (HISTIOTEUTHIDAE)
- oceani, Phasianella oceani G.A. Goldfuss, 1844 † - (PHASIANELLIDAE) (FOSSIL)
- oceani, Alvania oceani d'Orbigny, 1852 † - (RISSOIDAE) (FOSSIL)
- oceani, Strombus oceani A. Brongniart, 1821 † - syn of: Harpagodes oceani (A. Brongniart, 1821 †) - (STROMBIDAE) (FOSSIL)
- oceani, Arcopagia oceani Orbigny, 1850 † - (TELLINIDAE) (FOSSIL)
- oceanica, Anadara oceanica (R.P. Lesson, 1831) - (ARCIDAE)
- oceanica, Arca oceanica R.P. Lesson, 1831 - syn of: Anadara oceanica (R.P. Lesson, 1831) - (ARCIDAE)
- oceanica, Spinula oceanica Z.A. Filatova, 1958 - syn of: Bathyspinula calcarella (W.H. Dall, 1908) - (BATHYSPINULIDAE)
- oceanica, Bradybaena circulus oceanica T. Habe, 1962 - (BRADYBAENIDAE)
- oceanica, Carinaria oceanica A.J.B.M. Vayssière, 1904 - syn of: Carinaria lamarcki F. Péron & C.A. Lesueur, 1810 - (CARINARIIDAE)
- oceanica, Cryptomella oceanica (W.H. Dall, 1908) - (CLATHURELLIDAE)
- oceanica, Megalocranchia oceanica (N.A. Voss, 1960) - (CRANCHIIDAE)
- oceanica, Luria lurida oceanica (F.A. Schilder, 1930) - (CYPRAEIDAE)
- oceanica, Bela oceanica É.A.A. Locard, 1897 - (MANGELIIDAE)
- oceanica, Bela oceanica É.A.A. Locard, 1891 - syn of: Bela oceanica É.A.A. Locard, 1897 - (MANGELIIDAE)
- oceanica, Volvarina oceanica S. Gofas, 1989 - (MARGINELLIDAE)
- oceanica, Purpura oceanica É.A.A. Locard, 1882 - syn of: Stramonita haemastoma (C. Linnaeus, 1767) - (MURICIDAE)
- oceanica, Neilonella oceanica Z.A. Filatova, 1958 - (NEILONELLIDAE)
- oceanica, Turbonilla oceanica W.R.B. Oliver, 1915 - (PYRAMIDELLIDAE)
- oceanica, Pleurotomella oceanica W.H. Dall, 1908 - syn of: Cryptomella oceanica (W.H. Dall, 1908) - (RAPHITOMIDAE)
- oceanica, Testacella oceanica J.P.S. Grateloup, 1855 - syn of: Testacella maugei A.E.J. Férussac, 1819 - (TESTACELLIDAE)
- oceanica, Viriola oceanica C.F. Laseron, 1958 - (TRIPHORIDAE)
- oceanica, Gibbula oceanica H.A. Pilsbry, 1903 - (TROCHIDAE)
- oceanica, Plicoliva zelindae oceanica J. Coltro, 2005 - (VOLUTIDAE)
- oceanica, Pandalosia oceanica C.F. Laseron, 1956 - syn of: Schwartziella ephamilla (R.B. Watson, 1886) - (ZEBINIDAE)
- oceanicum, Clypeomorus oceanicum C. Hedley, 1899 - syn of: Clypeomorus bifasciata (G.B. II Sowerby, 1855) - (CERITHIIDAE)
- oceanicum, Raphitoma oceanicum É.A.A. Locard, 1892 - syn of: Bela oceanica É.A.A. Locard, 1897 - (RAPHITOMIDAE)
- Oceanida, Genus Oceanida L. de Folin, 1870 (EULIMIDAE)
- oceanida, Pleurotomella oceanida W.H. Dall, 1919 - syn of: Pleurotomella orariana (W.H. Dall, 1908) - (RAPHITOMIDAE)
- oceanida, Litharium oceanida (W.H. Dall, 1924) - (TRIPHORIDAE)
- oceanitis, Heliacus oceanitis (R. Bieler, 1993) - (ARCHITECTONICIDAE)
- oceanitis, Torinista oceanitis R. Bieler, 1993 - syn of: Heliacus oceanitis (R. Bieler, 1993) - (ARCHITECTONICIDAE)
- oceanodromae, Plicifusus oceanodromae W.H. Dall, 1919 - (BUCCINIDAE)
- oceanus, Pachydiscus oceanus (C.J. Maury, 1930 †) - (DESMOCERATIDAE) (FOSSIL)
- oceanus, Nautilus oceanus J.W. Hall, 1882 † - syn of: Cliftonoceras oceanus (J.W. Hall, 1882 †) - (NAUTILIDAE) (FOSSIL)
- oceanus, Cliftonoceras oceanus (J.W. Hall, 1882 †) - (URANOCERATIDAE) (FOSSIL)
- ocella, Granulina ocella T. McCleery, 2010 - (MARGINELLIDAE)
- Ocellaria, syn of: Genus Cribrarula E. Strand, 1929 (CYPRAEIDAE)
- ocellata, Aplysia ocellata D'Orbigny, 1839 - syn of: Aplysia dactylomela P.C.A.S.L. Rang, 1828 - (APLYSIIDAE)
- ocellata, Arca ocellata L.A. Reeve, 1844 - (ARCIDAE)
- ocellata, Arca ocellata W. Kobelt, 1889 - syn of: Arca boucardi F.P. Jousseaume, 1894 - (ARCIDAE)
- ocellata, Armina ocellata G.P. Deshayes, 1830 - syn of: Armina maculata C.S. Rafinesque, 1814 - (ARMINIDAE)
- ocellata, Felimida ocellata (J.A. Ortea, S. Gofas & Á. Valdés, 1997) - (CHROMODORIDIDAE)
- ocellata, Lienardia ocellata F.P. Jousseaume, 1884 - (CLATHURELLIDAE)
- ocellata, Mitrella ocellata (J.F. Gmelin, 1791) - (COLUMBELLIDAE)
- ocellata, Pictocolumbella ocellata (J.H.F. Link, 1807) - (COLUMBELLIDAE)
- ocellata, Columbella ocellata L.A. Reeve, 1859 - syn of: Suturoglypta iontha (E. Ravenel, 1861) - (COLUMBELLIDAE)
- ocellata, Columbella ocellata J.H.F. Link, 1807 - syn of: Pictocolumbella ocellata (J.H.F. Link, 1807) - (COLUMBELLIDAE)
- ocellata, Pyrene ocellata J.H.F. Link, 1807 - syn of: Pictocolumbella ocellata (J.H.F. Link, 1807) - (COLUMBELLIDAE)
- ocellata, Costasiella ocellata H.R. Simroth, 1895 - syn of: Costasiella ocellifera (H.R. Simroth, 1895) - (COSTASIELLIDAE)
- ocellata, Costellaria ocellata L.A. Reeve, 1844 - syn of: Vexillum interstriatum (G.B. II Sowerby, 1870) - (COSTELLARIIDAE)
- ocellata, Erosaria ocellata (C. Linnaeus, 1758) - (CYPRAEIDAE)
- ocellata, Cypraea ocellata C. Linnaeus, 1758 - syn of: Erosaria ocellata (C. Linnaeus, 1758) - (CYPRAEIDAE)
- ocellata, Platydoris ocellata K.M. Dorgan, Á. Valdés & T.M. Gosliner, 2002 - (DISCODORIDIDAE)
- ocellata, Leucozonia ocellata (J.F. Gmelin, 1791) - (FASCIOLARIIDAE)
- ocellata, Cuthona ocellata (R.L. Schmekel, 1966) - (FIONIDAE)
- ocellata, Monacha ocellata (J.R. Roth, 1839) - (HYGROMIIDAE)
- ocellata, Loligopsis ocellata R. Owen, 1881 - (IDIOSEPIIDAE)
- ocellata, Swainsonia ocellata (W.J. Swainson, 1831) - (MITRIDAE)
- ocellata, Purpura ocellata L.C. Kiener, 1835 - syn of: Acanthais brevidentata (W. Wood, 1828) - (MURICIDAE)
- ocellata, Morula ocellata L.A. Reeve, 1846 - syn of: Ergalatax contracta (L.A. Reeve, 1846) - (MURICIDAE)
- ocellata, Nerita ocellata E.J. Le Guillou, 1841 - (NERITIDAE)
- ocellata, Argonerita ocellata G. von dem Busch, 1844 - syn of: Nerita ocellata E.J. Le Guillou, 1841 - (NERITIDAE)
- ocellata, Phyllidia ocellata G.L.C.F.D. Cuvier, 1804 - (PHYLLIDIIDAE)
- ocellata, Berthella ocellata (S. Delle Chiaje, 1830) - (PLEUROBRANCHIDAE)
- ocellata, Hemilienardia ocellata F.P. Jousseaume, 1888 - syn of: Lienardia ocellata F.P. Jousseaume, 1884 - (RAPHITOMIDAE)
- ocellata, Sepiella ocellata G.J. Pfeffer, 1884 - (SEPIIDAE)
- ocellata, Melibe ocellata L.S.R. Bergh, 1888 - (TETHYDIDAE)
- ocellata, Alcyna ocellata (A. Adams, 1860) - (TROCHIDAE)
- ocellata, Voluta ocellata J.F. Gmelin, 1791 - syn of: Mitrella ocellata (J.F. Gmelin, 1791) - (VOLUTIDAE)
- ocellata ekerae, Swainsonia ocellata ekerae W.O. Cernohorsky, 1973 - (MITRIDAE)
- ocellata fasciomaculata, Erosaria ocellata fasciomaculata G.S. Coen, 1949 - syn of: Erosaria nebrites (J.C. Melvill, 1888) - (CYPRAEIDAE)
- ocellata guttata, Mitrella ocellata guttata G.B. I Sowerby, 1832 - syn of: Mitrella guttata (G.B. I Sowerby, 1832) - (COLUMBELLIDAE)
- ocellata incisa, Swainsonia ocellata incisa (A. Adams & L.A. Reeve, 1850) - (MITRIDAE)
- ocellata mariae, Scabricola ocellata mariae A. Adams, 1853 - syn of: Scabricola mariae (A. Adams, 1853) - (MITRIDAE)
- ocellata sublevigata, Swainsonia ocellata sublevigata L. Bozzetti, 2016 - (MITRIDAE)
- ocellata undula, Phyllidia ocellata undula N. Yonow, 1986 - syn of: Phyllidia ocellata G.L.C.F.D. Cuvier, 1804 - (PHYLLIDIIDAE)
- ocellatula, Zafra ocellatula (R.P.J. Hervier, 1899) - (COLUMBELLIDAE)
- ocellatum, Buccinum ocellatum J.F. Gmelin, 1791 - syn of: Leucozonia ocellata (J.F. Gmelin, 1791) - (BUCCINIDAE)
- ocellatum, Calliostoma ocellatum (L.A. Reeve, 1863) - (CALLIOSTOMATIDAE)
- ocellatus, Actinocyclus ocellatus C.G. Ehrenberg - (ACTINOCYCLIDAE)
- ocellatus, Phycophila ocellatus J.C. van Hasselt, 1824 - syn of: Plakobranchus ocellatus (J.C. van Hasselt, 1824) - (APLYSIIDAE)
- ocellatus, Cerithium ocellatus J.G. Bruguière, 1792 - syn of: Cerithium stercumuscarum A. Valenciennes, 1833 - (CERITHIIDAE)
- ocellatus, Napaeus ocellatus (A. Mousson, 1872) - (ENIDAE)
- ocellatus, Eubranchus ocellatus (J. Alder & A. Hancock, 1864) - (EUBRANCHIDAE)
- ocellatus, Nassarius ocellatus H.H. Kool & J. Galindo, 2014 - (NASSARIIDAE)
- ocellatus, Octopus ocellatus J.E. Gray, 1849 - syn of: Amphioctopus fangsiao (A.V.M.D. D'Orbigny, 1839) - (OCTOPODIDAE)
- ocellatus, Plakobranchus ocellatus (J.C. van Hasselt, 1824) - (PLAKOBRANCHIDAE)
- ocellatus, Plocamopherus ocellatus (W.P.E.S. Rüppell & F.S. Leuckart, 1828) - (POLYCERIDAE)
- ocellatus, Spondylus ocellatus L.A. Reeve, 1856 - (SPONDYLIDAE)
- ocellatus, Tremoctopus ocellatus P. Brock, 1882 - syn of: Tremoctopus violaceus S. Delle Chiaje, 1830 - (TREMOCTOPODIDAE)
- ocellifera, Costasiella ocellifera (H.R. Simroth, 1895) - (COSTASIELLIDAE)
- ocellifera, Doto ocellifera H.R. Simroth, 1895 - syn of: Costasiella ocellifera (H.R. Simroth, 1895) - (DOTIDAE)
- ocelliferus, Fusinus ocelliferus (J.B.P.A. Lamarck, 1816) - (FASCIOLARIIDAE)
- ocelliferus, Fusinus ocelliferus J.B.P.A. Lamarck, 1816 - syn of: Fusinus ocelliferus (J.B.P.A. Lamarck, 1816) - (FASCIOLARIIDAE)
- ocelliferus adamsii, Fusinus ocelliferus adamsii H.C. Küster & W. Kobelt, 1876 - (FASCIOLARIIDAE)
- ocelliferus cinnamomeus, Fusinus ocelliferus cinnamomeus L.A. Reeve, 1847 - (FASCIOLARIIDAE)
- ocelliferus robustior, Fusinus ocelliferus robustior G.B. III Sowerby, 1880 - (FASCIOLARIIDAE)
- ocelligera, Aglaja ocelligera (L.S.R. Bergh, 1893) - (AGLAJIDAE)
- ocelligera, Kentrodoris ocelligera (H.F.A. von Ihering) - (DISCODORIDIDAE)
- ocelligera, Doris ocelligera (L.S.R. Bergh, 1881) - (DORIDIDAE)
- ocellina, Nitidella ocellina F. Nordsieck, 1975 - syn of: Mitrella broderipi (G.B. I Sowerby, 1844) - (COLUMBELLIDAE)
- ocellina, Cantharidella ocellina (C. Hedley, 1911) - (TROCHIDAE)
- Ocellochiton, syn of: Genus Callochiton J.E. Gray, 1847 (CALLOCHITONIDAE)
- ocellus, Gibberula ocellus (W.H. Dall, 1927) - (CYSTISCIDAE)
- Ocenebra, Genus Ocenebra J.E. Gray, 1847 (MURICIDAE)
- Ocenebrellus, syn of: Subgenus Pteropurpura (Ocinebrellus) F.P. Jousseaume, 1880 (MURICIDAE)
- Ocenebrina, syn of: Genus Ocinebrina F.P. Jousseaume, 1880 (MURICIDAE)
- Ocenotrophon, Genus Ocenotrophon J.H. McLean, 1995 (MURICIDAE)
- Ochetoceras, Genus Ochetoceras von Buch, 1831 † (OPPELIIDAE) (FOSSIL)
- Ochetochilus, Genus Ochetochilus Szabo, 1983 † (EULIMIDAE) (FOSSIL)
- Ochetoclava, Subgenus Rhinoclavis (Ochetoclava) Woodring, 1928 † (CERITHIIDAE) (FOSSIL)
- Ochetoclava, syn of: Genus Rhinoclavis W.J. Swainson, 1840 (CERITHIIDAE)
- Ochetoctena, Genus Ochetoctena Oliver, 2014 (THYASIRIDAE)
- ochetonotus, Euhoplites ochetonotus (Seeley 1864 †) - (HOPLITIDAE) (FOSSIL)
- ochetonotus nodosa, Euhoplites ochetonotus nodosa Spath † - (HOPLITIDAE) (FOSSIL)
- ochetostomae, Pseudopythina ochetostomae B.S. Morton & P.H. Scott, 1989 - (KELLIIDAE)
- Ocheyoherpia, Genus Ocheyoherpia L. Salvini-Plawén, 1978 (PHYLLOMENIIDAE)
- ochiaiensis, Venericardia ferruginea ochiaiensis K. Chinzei, 1959 † - (CARDITIDAE) (FOSSIL)
- ochlockoneensis, Pecten ochlockoneensis W.C. Mansfield, 1932 † - (PECTINIDAE) (FOSSIL)
- ochlockoneensis, Turritella ochlockoneensis W.C. Mansfield, 1930 † - (TURRITELLIDAE) (FOSSIL)
- Ochmazochiton, Genus Ochmazochiton Hoare & Smith, 1984 † (OCHMAZOCHITONIDAE) (FOSSIL)
- OCHMAZOCHITONIDAE Hoare & Smith, 1984 † - Family (POLYPLACOPHORA-NEOLORICATA [Subclass]) (FOSSIL)
- ochotense, Buccinum ochotense Middendorf, 1848 - (BUCCINIDAE)
- ochotense, Ciliatocardium ciliatum ochotense A.I. Kafanov, 1981 - (CARDIIDAE)
- ochotense, Punctulum ochotense A.N. Golikov & B.I. Sirenko, 1998 - syn of: Punctulum flavum (T.A. Okutani, 1964) - (RISSOIDAE)
- ochotense declivis, Plicibuccinum ochotense declivis T. Habe & K. Itô, 1976 - syn of: Plicibuccinum declivis (T. Habe & K. Itô, 1976) - (BUCCINIDAE)
- ochotensis, Neptunea ochotensis A.N. Golikov, 1962 - (BUCCINIDAE)
- ochotensis, Lussivolutopsius ochotensis Y.I. Kantor, 1986 - (BUCCINIDAE)
- ochotensis, Serripes ochotensis Ilyina, 1963 † - (CARDIIDAE) (FOSSIL)
- ochotensis, Cardiomya ochotensis O.A. Scarlato, 1972 - (CUSPIDARIIDAE)
- ochotensis, Acirsa ochotensis A.T. von Middendorff, 1849 - syn of: Acirsa borealis (C. Lyell, 1841) - (EPITONIIDAE)
- ochotensis, Limacina helicina ochotensis L.S. Shkoldina, 1999 - (LIMACINIDAE)
- ochotensis, Margarites ochotensis R.A. Philippi, 1846 - syn of: Margarites schantaricus (A.T. von Middendorff, 1849) - (MARGARITIDAE)
- ochotensis, Anasibirites ochotensis Bytschkov, 1976 † - (MELAGATHICERATIDAE) (FOSSIL)
- ochotensis, Mytilus ochotensis Slodkewitsch, 1936 † - (MYTILIDAE) (FOSSIL)
- ochotensis, Nuculana ochotensis O.A. Scarlato, 1981 - syn of: Nuculana minuta (O.F. Müller, 1776) - (NUCULANIDAE)
- ochotensis, Octopus ochotensis (M. Sasaki, 1920) - (OCTOPODIDAE)
- ochotensis, Aelga ochotensis (Khomenko, 1938 †) - (PERIPLOMATIDAE) (FOSSIL)
- ochotensis, Trochus ochotensis R.A. Philippi, 1851 - syn of: Margarites schantaricus (A.T. von Middendorff, 1849) - (TROCHIDAE)
- ochotensis, Velutina ochotensis K.M. Derjugin, 1950 - syn of: Limneria undata (T. Brown, 1839) - (VELUTINIDAE)
- ochotensis, Phreagena ochotensis (O.A. Scarlato, 1981) - (VESICOMYIDAE)
- ochotensis, Musashia ochotensis A. Oleinik, 1991 † - (VOLUTIDAE) (FOSSIL)
- ochotensis, Megayoldia ochotensis O.A. Scarlato, 1981 - syn of: Megayoldia thraciaeformis (D.H. Storer, 1838) - (YOLDIIDAE)
- ochotensis, Megayoldia ochotensis O.A. Scarlato, 1981 - syn of: Megayoldia thraciaeformis (D.H. Storer, 1838) - (YOLDIIDAE)
- ochotensis, Cnesterium ochotensis Khomenko, 1922 † - syn of: Yoldia notabilis M. Yokoyama, 1922 - (YOLDIIDAE) (FOSSIL)
- ochoterenai, Subcollina ochoterenai Pavia, 2000 † - (AMMONOIDEA (UNASSIGNED)) (FOSSIL)
- ochotica, Kolhymamnicola ochotica F. Zatrawkin & V.V. Bogatov, 1988 - (AMNICOLIDAE)
- ochotica, Cyclocardia ochotica (Slodkewitsch, 1936 †) - (CARDITIDAE) (FOSSIL)
- ochotica, Entomonotis ochotica (Keyserling, 1848 †) - (MONOTIDAE) (FOSSIL)
- ochotica, Mya ochotica Ilyina, 1957 † - (MYIDAE) (FOSSIL)
- ochotica, Maclearnia ochotica Milova, 1985 † - (PECTINIDAE) (FOSSIL)
- ochotica, Nuttallia ochotica (Slodkewitsch, 1936 †) - (PSAMMOBIIDAE) (FOSSIL)
- ochotica, Middendorffinaia ochotica V.V. Bogatov, 2000 - syn of: Unio crassus L. Philipsson in A. Retzius, 1788 - (UNIONIDAE)
- ochotica, Policordia ochotica O.A. Scarlato, 1981 - syn of: Policordia pilula (J.P.L. Pelseneer, 1911) - (VERTICORDIIDAE)
- ochotica, Archivesica ochotica O.A. Scarlato, 1981 - (VESICOMYIDAE)
- ochoticum, Angulaticeras ochoticum Repin, 1972 † - (SCHLOTHEIMIIDAE) (FOSSIL)
- Ochotoceras, syn of: Genus Eleganticeras Sowerby, 1815 † (HILDOCERATIDAE) (FOSSIL)
- Ochotochlamys, Subgenus Argopecten (Ochotochlamys) Unknown † (PECTINIDAE) (FOSSIL)
- ochra, Charopa ochra W.H. Webster, 1904 - (CHAROPIDAE)
- ochracea, Acmaea ochracea W.H. Dall, 1871 - syn of: Lottia scutum (J. Rathke, 1833) - (ACMAEIDAE)
- ochracea, Ampullaria ochracea J.C. Jay, 1836 - syn of: Pomacea flagellata (T. Say, 1829) - (AMPULLARIIDAE)
- ochracea, Borsonia ochracea K.H.J. Thiele, 1925 - (BORSONIIDAE)
- ochracea, Echinix ochracea F.G. Thompson & E. Naranjo-Garcia, 2012 - (ECHINICHIDAE)
- ochracea, Helicina ochracea F. Poey - syn of: Emoda silacea (P.M.A. Morelet, 1849) - (HELICINIDAE)
- ochracea, Lottia ochracea W.H. Dall, 1871 - syn of: Lottia instabilis (A.A. Gould, 1846) - (LOTTIIDAE)
- ochracea, Lucina ochracea L.A. Reeve, 1850 - syn of: Lucinisca fenestrata (R.B. Hinds, 1845) - (LUCINIDAE)
- ochracea, Mactra ochracea E.C. Von Martens, 1880 - (MACTRIDAE)
- ochracea, Alaginella ochracea (G.F. Angas, 1871) - (MARGINELLIDAE)
- ochracea, Marginella ochracea G.F. Angas, 1871 - syn of: Alaginella ochracea (G.F. Angas, 1871) - (MARGINELLIDAE)
- ochracea, Mitra ochracea R.P.J. Hervier, 1897 - syn of: Vexillum ochraceum (R.P.J. Hervier, 1897) - (MITRIDAE)
- ochracea, Ostrea ochracea G.B. II Sowerby, 1871 - syn of: Crassostrea columbiensis (L.G. Hertlein, 1951) - (OSTREIDAE)
- ochracea, Crassostrea ochracea G.B. II Sowerby, 1871 - syn of: Crassostrea columbiensis (L.G. Hertlein, 1951) - (OSTREIDAE)
- ochracea, Oxyloma ochracea F.E. De Betta, 1852 - syn of: Oxyloma elegans (A. Risso, 1826) - (SUCCINEIDAE)
- ochracea, Tellina ochracea (P.P. Carpenter, 1864) - (TELLINIDAE)
- ochracea, Laciolina ochracea P.P. Carpenter, 1864 - syn of: Tellina ochracea (P.P. Carpenter, 1864) - (TELLINIDAE)
- ochracea, Leptodea ochracea (T. Say, 1817) - (UNIONIDAE)
- ochraceum, Vexillum ochraceum (R.P.J. Hervier, 1897) - (COSTELLARIIDAE)
- ochraceus, Vermiculatus ochraceus (P.M.A. Morelet, 1863) - (BULIMULIDAE)
- ochraceus, Conus ochraceus J.B.P.A. Lamarck, 1810 - syn of: Lindaconus spurius (J.F. Gmelin, 1791) - (CONIDAE)
- ochraceus, Paralimax ochraceus H.R. Simroth, 1901 - syn of: Eumilax brandti (E.C. Von Martens, 1880) - (LIMACIDAE)
- ochraceus, Milax ochraceus (P. Bérenguier, 1900) - (MILACIDAE)
- ochraceus, Trochus ochraceus R.A. Philippi, 1846 - syn of: Pomaulax gibberosa (L.W. Dillwyn, 1817) - (TROCHIDAE)
- ochracina, Succinea ochracina J. Gundlach in F. Poey, 1858 - (SUCCINEIDAE)
- ochraspiris, Bulimulus ochraspiris R.M. Branson & W.D. McCoy, 1965 - syn of: Bulimulus unicolor (G.B. I Sowerby, 1833) - (BULIMULIDAE)
- ochreata, Erodona ochreata R.B. Hinds, 1843 - syn of: Erodona mactroides F.M. Daudin, 1802 - (ERODONIDAE)
- ochridana, Pseudohoratia ochridana (W. Polinski, 1929) - (HYDROBIIDAE)
- ochridensis, Montenegrina perstriata ochridensis (A.J. Wagner, 1925) - (CLAUSILIIDAE)
- Ochridopyrgula, syn of: Genus Ohridopyrgula P. Radoman, 1955 (HYDROBIIDAE)
- ochrobrunnea, Crassispira ochrobrunnea J.C. Melvill, 1923 - (PSEUDOMELATOMIDAE)
- ochrocheilus, Drymaeus ochrocheilus E.A. Smith, 1877 - (BULIMULIDAE)
- Ochroderma, Genus Ochroderma C.M.F. Ancey, 1885 (SUBULINIDAE)
- Ochrodermatina, Subgenus Ochroderma (Ochrodermatina) K.H.J. Thiele, 1931 (SUBULINIDAE)
- Ochrodermella, Subgenus Ochroderma (Ochrodermella) H.A. Pilsbry, 1907 (SUBULINIDAE)
- ochroglottis, Canarium ochroglottis R.T. Abbott, 1960 - (STROMBIDAE)
- ochroglottis, Canarium ochroglottis (R.T. Abbott, 1960) - syn of: Canarium ochroglottis R.T. Abbott, 1960 - (STROMBIDAE)
- ochroglottis betuleti, Canarium ochroglottis betuleti G.C. Kronenberg, 1991 - syn of: Canarium betuleti (G.C. Kronenberg, 1991) - (STROMBIDAE)
- ochroleuca, Eatonina ochroleuca (Š. Brusina, 1869) - (CINGULOPSIDAE)
- ochroleuca, Drillia ochroleuca J.C. Melvill & E.R. Sykes, 1897 - (DRILLIIDAE)
- ochroleuca, Ficus ochroleuca K.T. Menke, 1845 - syn of: Xanthochorus cassidiformis (H.M.D. de Blainville, 1832) - (FICIDAE)
- ochroleuca, Ostrea ochroleuca J.F. Gmelin, 1791 - syn of: Mimachlamys varia (C. Linnaeus, 1758) - (OSTREIDAE)
- ochroleuca, Mimachlamys ochroleuca J.F. Gmelin, 1791 - syn of: Mimachlamys varia (C. Linnaeus, 1758) - (PECTINIDAE)
- ochroleuca, Cingula ochroleuca Š. Brusina, 1869 - (RISSOIDAE)
- ochroleuca, Rissoia ochroleuca J.W. Brazier, 1894 - syn of: Onoba australiae (G.R. von Frauenfeld, 1867) - (RISSOIDAE)
- ochroleuca, Petricola ochroleuca J.B.P.A. Lamarck, 1818 - syn of: Gastrana fragilis (C. Linnaeus, 1758) - (VENERIDAE)
- ochroleucum, Buccinum ochroleucum J.F. Gmelin, 1791 - syn of: Galeodea echinophora (C. Linnaeus, 1758) - (BUCCINIDAE)
- ochroleucum, Galeodea ochroleucum J.F. Gmelin, 1791 - syn of: Galeodea echinophora (C. Linnaeus, 1758) - (CASSIDAE)
- ochroleucum, Chilostoma achates ochroleucum (J.F. Babor & J. Koštal, 1894) - (HELICIDAE)
- ochroleucus, Graphiconus ochroleucus (J.F. Gmelin, 1791) - (CONIDAE)
- ochroleucus, Trochus ochroleucus J.F. Gmelin, 1791 - (TROCHIDAE)
- ochroleucus, Clanculus ochroleucus (R.A. Philippi, 1853) - (TROCHIDAE)
- ochroleucus tmetus, Graphiconus ochroleucus tmetus (J.R. le B. Tomlin, 1937) - (CONIDAE)
- ochroleurcus, Trochus ochroleurcus J.F. Gmelin, 1791 - syn of: Trochus ochroleucus J.F. Gmelin, 1791 - (TROCHIDAE)
- ochropicta, Venus ochropicta I. Krynicki, 1837 - syn of: Pitar rudis (G.S. Poli, 1795) - (VENERIDAE)
- ochrostigmata, Natica ochrostigmata H.A. Rehder, 1980 - syn of: Notocochlis cernica (F.P. Jousseaume, 1874) - (NATICIDAE)
- ochrostoma, Callistocharis ochrostoma (A. Garrett, 1872) - (BOTHRIEMBRYONTIDAE)
- ochrostoma, Bulimus ochrostoma A. Garrett, 1872 - syn of: Callistocharis ochrostoma (A. Garrett, 1872) - (BULIMULIDAE)
- ochrostoma, Liarea ochrostoma W.H. Pease, 1865 - (LIAREIDAE)
- ochrostoma, Pascula ochrostoma (H.M.D. de Blainville, 1832) - (MURICIDAE)
- ochrostoma, Drupella ochrostoma W. Wood, 1828 - syn of: Muricodrupa fenestrata (H.M.D. de Blainville, 1832) - (MURICIDAE)
- ochrostoma, Natica ochrostoma C.A. Récluz, 1850 - syn of: Polinices lacteus L. Guilding, 1834 - (NATICIDAE)
- ochrostoma heptagonalis, Drupa ochrostoma heptagonalis L.A. Reeve, 1846 - syn of: Ergalatax heptagonalis (L.A. Reeve, 1846) - (MURICIDAE)
- ochseni, Amphidoxa ochseni (R.A. Philippi, 1855) - (CHAROPIDAE)
- ochsenii, Plectostylus ochsenii R.W. Dunker, 1855 - (BOTHRIEMBRYONTIDAE)
- ochsneri, Naesiotus ochsneri W.H. Dall, 1917 - (BULIMULIDAE)
- ochsneri, Colubraria ochsneri L.G. Hertlein & E.C. Allison, 1968 - (COLUBRARIIDAE)
- ochsneri, Melanella ochsneri (P. Bartsch, 1917) - (EULIMIDAE)
- ochsneri, Saccella ochsneri (Anderson & Martin †) - (NUCULANIDAE) (FOSSIL)
- ochsneri, Crassispira ochsneri L.G. Hertlein & A.M. Strong, 1949 - syn of: Cleospira ochsneri (L.G. Hertlein & A.M. Strong, 1949) - (PSEUDOMELATOMIDAE)
- ochsneri, Monilispira ochsneri L.G. Hertlein & A.M. Strong, 1949 - syn of: Cleospira ochsneri (L.G. Hertlein & A.M. Strong, 1949) - (PSEUDOMELATOMIDAE)
- ochsneri, Cleospira ochsneri (L.G. Hertlein & A.M. Strong, 1949) - (STRICTISPIRIDAE)
- ochsneri, Teinostoma ochsneri A.M. Strong & L.G. Hertlein, 1939 - (TORNIDAE)
- Ochsneria, syn of: Genus Naesiotus J.A. Albers, 1850 (BULIMULIDAE)
- Ochtephila, Genus Ochtephila H.H. Beck, 1837 (HYGROMIIDAE)
- Ochthephila, syn of: Genus Ochtephila H.H. Beck, 1837 (HYGROMIIDAE)
- ochthogyra, Sitala ochthogyra (O.F. von Möllendorff, 1901) - (ARIOPHANTIDAE)
- ochthogyra, Omphalotropis ochthogyra J.F. Quadras & O.F. von Möllendorff, 1894 - (ASSIMINEIDAE)
- ochthoplax, Camaena ochthoplax (W.H. Benson, 1860) - (CAMAENIDAE)
- ochum, Aegires ochum J.A. Ortea, J. Espinosa & G.M. Caballer, 2013 - (AEGIRIDAE)
- ochuroma, Xanthochorus ochuroma DeVries, 2005 † - (MURICIDAE) (FOSSIL)
- ochyra, Strombina ochyra W.P. Woodring, 1964 † - (COLUMBELLIDAE) (FOSSIL)
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