- orca, Philine orca T.M. Gosliner, 1988 - (PHILINIDAE)
- orca, Ericusa orca B.C. Cotton, 1952 - syn of: Ericusa fulgetrum orca (B.C. Cotton, 1952) - (VOLUTIDAE)
- orca, Ericusa fulgetrum orca (B.C. Cotton, 1952) - (VOLUTIDAE)
- orcadensis, Bathyberthella orcadensis F.J. García, J.C. García-Gómez, J.S. Troncoso & J.L. Cervera, 1994 - (PLEUROBRANCHIDAE)
- orcadis, Montidelos orcadis (T. Iredale, 1943) - (RHYTIDIDAE)
- orcagnae, Stephanoconus orcagnae Oppenheim, 1901 † - (CONIDAE) (FOSSIL)
- orcas, Amphicyrtoceras orcas (J.W. Hall †) - (ACLEISTOCERATIDAE) (FOSSIL)
- orcasense, Pisidium orcasense V. Sterki, 1922 - syn of: Pisidium casertanum (Poli, 1791) - (SPHAERIIDAE)
- orcesi, Drymaeus expansus orcesi W.K. Weyrauch, 1958 - (BULIMULIDAE)
- orcesi, Thaumastus orcesi W.K. Weyrauch, 1967 - (MEGASPIRIDAE)
- Orcesiellus, syn of: Subgenus Plekocheilus (Aeropictus) W.K. Weyrauch, 1967 (AMPHIBULIMIDAE)
- orcha, Doto orcha N. Yonow, 2000 - (DOTIDAE)
- orchardi, Caucasites orchardi Bucher, 2002 † - (GYMNITIDAE) (FOSSIL)
- orchardi, Dryojuvavites orchardi Tozer, 1994 † - (JUVAVITIDAE) (FOSSIL)
- orchardi, Nuetzelopsis orchardi Frýda & al., 2003 † - (NERITOPSIDAE) (FOSSIL)
- orchardi, Palaeopharus orchardi McRoberts, 2017 † - (PALAEOPHARIDAE) (FOSSIL)
- orchida, Gulella orchida K.C. Emberton, 2001 - (STREPTAXIDAE)
- orchidae, Owensgriffithsius orchidae K.C. Emberton, 2002 - (CYCLOPHORIDAE)
- orchidae, Cyclotopsis orchidae (K.C. Emberton, 2003) - (POMATIIDAE)
- orchidaea, Chelidonura orchidaea A. Perrone, 1990 - (AGLAJIDAE)
- orchidifloris, Murex orchidifloris T. Shikama, 1973 - syn of: Chicoreus orchidiflorus (T. Shikama, 1973) - (MURICIDAE)
- orchidiflorus, Chicoreus orchidiflorus (T. Shikama, 1973) - (MURICIDAE)
- orchidiflorus, Pterynotus orchidiflorus T. Shikama, 1973 - syn of: Chicoreus orchidiflorus (T. Shikama, 1973) - (MURICIDAE)
- orchidiflorus celinamarumai, Latiaxis orchidiflorus celinamarumai (S. Kosuge, 1980) - syn of: Latiaxis cerinamarumai (S. Kosuge, 1980) - (MURICIDAE)
- orchidus, Kalidos orchidus K.C. Emberton, 2007 - (ARIOPHANTIDAE)
- orchis, Sitala orchis H.H. Godwin-Austen, 1891 - (ARIOPHANTIDAE)
- orcia, Yoldiella orcia (W.H. Dall, 1916) - (YOLDIIDAE)
- orcina, Lyncina vitellus orcina T. Iredale, 1931 - (CYPRAEIDAE)
- orcula, Bithynia orcula G.R. von Frauenfeld, 1862 - (BITHYNIIDAE)
- orcula, Helix orcula W.H. Benson, 1850 - syn of: Pupisoma orcula (W.H. Benson, 1850) - (HELICIDAE)
- Orcula, Genus Orcula F. Held, 1837 (ORCULIDAE)
- orcula, Microlampra orcula Pan & Erwin, 2002 † - (ORTHONEMIDAE) (FOSSIL)
- orcula, Pupisoma orcula (W.H. Benson, 1850) - (VERTIGINIDAE)
- Orculella, Genus Orculella C.M. Steenberg, 1925 (ORCULIDAE)
- ORCULIDAE Steenberg, 1925 - Family (GASTROPODA-HETEROBRANCHIA [Subclass]-PULMONATA [Infraclass]-STYLOMMATOPHORA [Order]-ORCULOIDEA [Superfamily])
- orcutti, Amnicola orcutti H.A. Pilsbry, 1928 - syn of: Littoridina orcutti (H.A. Pilsbry, 1928) - (AMNICOLIDAE)
- orcutti, Barleeia orcutti P. Bartsch, 1920 - (BARLEEIIDAE)
- orcutti, Caecum orcutti W.H. Dall, 1885 - (CAECIDAE)
- orcutti, Littoridina orcutti (H.A. Pilsbry, 1928) - (COCHLIOPIDAE)
- orcutti, Epiphragmophora orcutti W.H. Dall, 1900 - (EPIPHRAGMOPHORIDAE)
- orcutti, Fusinus orcutti W.H. Dall, 1915 - syn of: Trachypollia lugubris (C.B. Adams, 1852) - (FASCIOLARIIDAE)
- orcutti, Chlamydoconcha orcutti W.H. Dall, 1884 - (GALEOMMATIDAE)
- orcutti, Lima orcutti L.G. Hertlein & J. Grant, 1972 - syn of: Limaria orbignyi (É. Lamy, 1930) - (LIMIDAE)
- orcutti, Mitra orcutti W.H. Dall, 1920 - syn of: Mitromorpha orcutti (W.H. Dall, 1920) - (MITRIDAE)
- orcutti, Mitromorpha orcutti (W.H. Dall, 1920) - (MITROMORPHIDAE)
- orcutti, Amicula orcutti W.H. Dall, 1884 - (MOPALIIDAE)
- orcutti, Poteria orcutti P. Bartsch, 1942 - (NEOCYCLOTIDAE)
- orcutti, Nuculana orcutti R. Arnold, 1907 † - (NUCULANIDAE) (FOSSIL)
- orcutti, Weinlandipoma orcutti (P. Bartsch, 1946) - (POMATIIDAE)
- orcutti, Nuttallia orcutti W.H. Dall, 1921 - syn of: Nuttallia nuttallii (T.A. Conrad, 1837) - (PSAMMOBIIDAE)
- orcutti, Sanguinolaria orcutti W.H. Dall, 1921 - syn of: Nuttallia nuttallii (T.A. Conrad, 1837) - (PSAMMOBIIDAE)
- orcutti, Macron orcutti W.H. Dall, 1918 - (PSEUDOLIVIDAE)
- orcutti, Bankia orcutti P. Bartsch, 1923 - (TEREDINIDAE)
- orcutti, Holospira orcutti P. Bartsch, 1925 - (UROCOPTIDAE)
- orcutti, Anisospira orcutti W.H. Dall, 1910 - syn of: Anisospira liebmanni (L. Pfeiffer, 1846) - (UROCOPTIDAE)
- orcutti, Macrocallista orcutti W.H. Dall, 1918 - syn of: Megapitaria squalida (G.B. I Sowerby, 1835) - (VENERIDAE)
- orcuttiana, Coralliophila orcuttiana W.H. Dall, 1919 - (MURICIDAE)
- orcuttianum, Epitonium orcuttianum W.H. Dall, 1917 - syn of: Epitonium californicum W.H. Dall, 1917 - (EPITONIIDAE)
- orcuttii, Unio orcuttii B.H. Wright, 1888 - syn of: Elliptio jayensis I. Lea, 1838 - (UNIONIDAE)
- Orcuttipoma, syn of: Genus Rhytidopoma E.R. Sykes, 1901 (POMATIIDAE)
- ordalensis, Tibia ordalensis (J. Almera & A. Bofill, 1886 †) - (ROSTELLARIIDAE) (FOSSIL)
- ordenanum, Epitonium ordenanum H.N. Lowe, 1932 - syn of: Opalia infrequens (C.B. Adams, 1852) - (EPITONIIDAE)
- ordenarum, Opalia ordenarum (M. Smith, 1944) - (EPITONIIDAE)
- ordesae, Xerocrassa ordesae C. Altimira, 1970 - syn of: Amandana ripacurcica montsicciana (A. Bofill, 1890) - (HYGROMIIDAE)
- ordinaria, Ancilla ordinaria E.A. Smith, 1906 - (ANCILLARIIDAE)
- ordinaria, Zemacies ordinaria (P. Marshall, 1918 †) - (BORSONIIDAE) (FOSSIL)
- ordinaria, Euthria ordinaria W.H. Turton, 1932 - syn of: Peristernia fuscotincta (G.B. III Sowerby, 1886) - (BUCCINIDAE)
- ordinaria, Kaliella ordinaria C.M.F. Ancey, 1903 - (CHRONIDAE)
- ordinaria, Polymesoda ordinaria (T. Prime, 1865) - (CYRENIDAE)
- ordinaria, Peristernia ordinaria W.H. Turton, 1932 - syn of: Peristernia fuscotincta (G.B. III Sowerby, 1886) - (FASCIOLARIIDAE)
- ordinaria, Inkinga ordinaria W.H. Turton, 1932 - syn of: Inkinga platystoma (E.A. Smith, 1877) - (HORAICLAVIDAE)
- ordinaria, Mactra ordinaria (E.A. Smith, 1898) - (MACTRIDAE)
- ordinaria, Maorimactra ordinaria E.A. Smith, 1898 - syn of: Mactra ordinaria (E.A. Smith, 1898) - (MACTRIDAE)
- ordinaria, Mangelia ordinaria (E.A. Smith, 1882) - (MANGELIIDAE)
- ordinaria, Nassa ordinaria W.H. Turton, 1932 - syn of: Nassarius capensis (R.W. Dunker, 1846) - (NASSARIIDAE)
- ordinaria, Patella candei ordinaria J.F. Mabille, 1888 - (PATELLIDAE)
- ordinaria, Rissoa ordinaria E.A. Smith, 1890 - (RISSOIDAE)
- ordinaria, Subulona ordinaria H.B. Preston, 1910 - (SUBULINIDAE)
- ordinaria, Macomopsis ordinaria G.B. III Sowerby, 1904 - syn of: Macomopsis crawfordi ordinaria (G.B. III Sowerby, 1904) - (TELLINIDAE)
- ordinaria, Macomopsis crawfordi ordinaria (G.B. III Sowerby, 1904) - (TELLINIDAE)
- ordinaria major, Ancilla ordinaria major W.H. Turton, 1932 - syn of: Ancilla albozonata E.A. Smith, 1904 - (ANCILLARIIDAE)
- ordinarium, Solarium ordinarium E.A. Smith, 1890 - syn of: Architectonica nobilis P.F. Röding, 1798 - (ARCHITECTONICIDAE)
- ordinarium, Quenstedtoceras praelamberti ordinarium (J. Leckenby, 1859 †) - (CARDIOCERATIDAE) (FOSSIL)
- ordinarius, Pseudofax ordinarius (Marshall, 1917 †) - (BUCCINIDAE) (FOSSIL)
- ordinarius, Conus ordinarius C. Linnaeus, 1758 - syn of: Leptoconus ammiralis (C. Linnaeus, 1758) - (CONIDAE)
- ordinarius, Melampus ordinarius J.C. Melvill & J.H. Ponsonby, 1901 - syn of: Melampus lividus (G.P. Deshayes, 1830) - (ELLOBIIDAE)
- ordinata, Filodrillia ordinata C.F. Laseron, 1954 - (BORSONIIDAE)
- ordinata, Crosseola ordinata Rubio & Rolán, 2017 - (CROSSEOLIDAE)
- ordinata, Retispira ordinata W.J. Gordon & E.L. Yochelson, 1987 † - (KNIGHTITIDAE) (FOSSIL)
- ordinata, Iniforis ordinata C.F. Laseron, 1958 - (TRIPHORIDAE)
- ordinatum, Sudeticeras ordinatum E.W.J. Moore, 1950 † - (ANTHRACOCERATIDAE) (FOSSIL)
- ordinatum, Scrinium ordinatum (F.W. Hutton, 1877 †) - (MITROMORPHIDAE) (FOSSIL)
- ordinatum, Protocycloceras ordinatum (Billings, 1865 †) - (PROTOCYCLOCERATIDAE) (FOSSIL)
- ordinei, Horaiclavus ordinei A. Bonfitto & M. Morassi, 2014 - (HORAICLAVIDAE)
- ordis, Allorisma ordis Lutkevitch & Lobanova, 1960 † - syn of: Exochorhynchus similis (Lutkevitch & Lobanova, 1960 †) - (EDMONDIIDAE) (FOSSIL)
- ordis, Exochorhynchus ordis Lutkevitch & Lobanova, 1960 † - syn of: Exochorhynchus similis (Lutkevitch & Lobanova, 1960 †) - (SANGUINOLITIDAE) (FOSSIL)
- ordita, Exilia ordita (L.M.D. Bellardi & O.G. Michelotti, 1841 †) - (PTYCHATRACTIDAE) (FOSSIL)
- ordita, Chrysallida ordita G.S. Coen, 1937 - syn of: Trabecula jeffreysiana (T.A. de M. Monterosato, 1884) - (PYRAMIDELLIDAE)
- orditus, Rhinoclavis orditus O.G. Michelotti, 1861 † - (CERITHIIDAE) (FOSSIL)
- ordo, Solariella ordo (C.R. Laws, 1941 †) - (SOLARIELLIDAE) (FOSSIL)
- ordofasciarum, Eatonina ordofasciarum E. Rolán & J.M. Hernández, 2006 - (CINGULOPSIDAE)
- Ordogeisonoceras, Genus Ordogeisonoceras Frey , 1995 † (GEISONOCERATIDAE) (FOSSIL)
- ordonesi, Prohinnites ordonesi Imlay, 1940 † - (PECTINIDAE) (FOSSIL)
- ordosensis, Hormotoma ordosensis Yü, 1961 † - (MURCHISONIIDAE) (FOSSIL)
- Ordosoceras, Genus Ordosoceras Chang, 1959 † (POLYDESMIIDAE) (FOSSIL)
- ordovica, Boucotspira ordovica Longst, 1924 † - syn of: Boucotspira ordovicia (Longst, 1924 †) - (HELICOTOMIDAE) (FOSSIL)
- ordovicia, Boucotspira ordovicia (Longst, 1924 †) - (HELICOTOMIDAE) (FOSSIL)
- ordovicia, Murchisonia ordovicia Yü, 1961 † - (MURCHISONIIDAE) (FOSSIL)
- ordovicicus, Dystactella ordovicicus (Pojeta & Runnegar 1985) † - (CTENODONTIDAE) (FOSSIL)
- ordovicina, Palaeoscurria ordovicina Horný, 1963 † - (METOPTOMATIDAE) (FOSSIL)
- ordovicius, Euomphalopterus ordovicius Longst, 1924 † - syn of: Boucotspira ordovicia (Longst, 1924 †) - (EUOMPHALIDAE) (FOSSIL)
- ordovicus, Euomphalopterus ordovicus Longst, 1924 † - syn of: Boucotspira ordovicia (Longst, 1924 †) - (EUOMPHALIDAE) (FOSSIL)
- ordovix, Hormotoma ordovix J. Donald, 1902 † - (MURCHISONIIDAE) (FOSSIL)
- Ordtrachia, Genus Ordtrachia G.A. Solem, 1984 (CAMAENIDAE)
- ordunensis, Chondrina ordunensis H.A. Pilsbry, 1918 - syn of: Chondrina kobelti (C.A. Westerlund, 1878) - (CHONDRINIDAE)
- ordunensis, Helicella ordunensis (W. Kobelt, 1882) - (HYGROMIIDAE)
- oreada, Triphora oreada P. Bartsch, 1915 - (TRIPHORIDAE)
- oreades, Mesembrinus oreades (A.V.M.D. D'Orbigny, 1835) - (BULIMULIDAE)
- oreades, Helix oreades D'Orbigny, 1835 - syn of: Mesembrinus oreades (A.V.M.D. D'Orbigny, 1835) - (HELICIDAE)
- Oreades, Subgenus Humboldtiana (Oreades) F.G. Thompson & Brewer, 2000 (HUMBOLDTIANIDAE)
- oreades, Linopyrga oreades (C.F. Laseron, 1959) - (PYRAMIDELLIDAE)
- oreas, Labyrinthus oreas F.C.L. Koch, 1844 - (CAMAENIDAE)
- oreas, Samoana oreas D.M. Crampton & C.M. Cooke, 1953 - (PARTULIDAE)
- oreas, Glessula oreas (L.A. Reeve, 1850) - (SUBULINIDAE)
- Orecopia, Genus Orecopia Knight, 1945 † (OMPHALOTROCHIDAE) (FOSSIL)
- orectes, Ginella orectes L.Y. Jiang, 1982 † - syn of: Ilsanella oblonga (Cobbold, 1921 †) - (HELCIONELLIDAE) (FOSSIL)
- orectes, Ilsanella orectes L.Y. Jiang, 1982 † - syn of: Ilsanella orectus L.Y. Jiang, 1982 † - (SCENELLIDAE) (FOSSIL)
- Orectospira, Genus Orectospira W.H. Dall, 1925 (TURRITELLIDAE)
- orectus, Ilsanella orectus L.Y. Jiang, 1982 † - (SCENELLIDAE) (FOSSIL)
- oregmene, Calliotropis oregmene C. Vilvens, 2007 - (CALLIOTROPIDAE)
- oregon, Calliostoma oregon W.J. Clench & H. Turner, 1960 - (CALLIOSTOMATIDAE)
- oregona, Xylophaga oregona J.R. Voight, 2007 - (XYLOPHAGAIDAE)
- oregona, Kalayoldia oregona (Shumard, 1858 †) - (YOLDIIDAE) (FOSSIL)
- oregonae, Muusoctopus oregonae (R.B. Toll, 1981) - (ENTEROCTOPODIDAE)
- oregonenesis, Cryptomya oregonenesis W.H. Dall, 1909 - syn of: Cryptomya californica (T.A. Conrad, 1837) - (MYIDAE)
- oregonense, Mantelliceras oregonense Anderson, 1958 † - syn of: Calycoceras naviculare (Mantell, 1822 †) - (ACANTHOCERATIDAE) (FOSSIL)
- oregonense, Phlycticrioceras oregonense H.B. Geinitz, 1850 † - syn of: Phlycticrioceras trinodosus (H.B. Geinitz, 1850 †) - (ANISOCERATIDAE) (FOSSIL)
- oregonense, Caecum crebricinctum oregonense P. Bartsch, 1920 - (CAECIDAE)
- oregonense, Eutrephoceras oregonense Miller, 1947 † - (NAUTILIDAE) (FOSSIL)
- oregonensis, Wellsia oregonensis (Anderson, 1938 †) - (AMMONOIDEA (UNASSIGNED)) (FOSSIL)
- oregonensis, Anoptychia oregonensis A. Nützel & al., 2003 † - (ANOPTYCHIIDAE) (FOSSIL)
- oregonensis, Spitidiscus oregonensis Imlay, 1960 † - (BARREMITIDAE) (FOSSIL)
- oregonensis, Bruclarkia oregonensis (T.A. Conrad †) - (BUCCINIDAE) (FOSSIL)
- oregonensis, Cancellaria oregonensis T.A. Conrad, 1865 † - (CANCELLARIIDAE) (FOSSIL)
- oregonensis, Crassinella oregonensis A.M. Keen, 1938 - syn of: Crassinella lunulata (T.A. Conrad, 1834) - (CRASSATELLIDAE)
- oregonensis, Pachydiscus oregonensis Anderson, 1958 † - (DESMOCERATIDAE) (FOSSIL)
- oregonensis, Muusoctopus oregonensis (N.A. Voss & W.G. Pearcy, 1990) - (ENTEROCTOPODIDAE)
- oregonensis, Priscofusus oregonensis T.A. Conrad, 1849 † - syn of: Priscofusus medialis (T.A. Conrad, 1849 †) - (FASCIOLARIIDAE) (FOSSIL)
- oregonensis, Gonatus oregonensis K. Jefferts, 1985 - (GONATIDAE)
- oregonensis, Halobia oregonensis Smith, 1927 † - (HALOBIIDAE) (FOSSIL)
- oregonensis, Kirengella oregonensis Stinchcomb & Angeli, 2002 † - (KIRENGELLIDAE) (FOSSIL)
- oregonensis, Mulinia oregonensis W.H. Dall, 1909 † - syn of: Pseudocardium densatum (T.A. Conrad, 1856 †) - (MACTRIDAE) (FOSSIL)
- oregonensis, Cryptomya oregonensis W.H. Dall, 1909 - syn of: Cryptomya californica (T.A. Conrad, 1837) - (MYIDAE)
- oregonensis, Vaugonia oregonensis Poulton, 1979 † - (MYOPHORELLIDAE) (FOSSIL)
- oregonensis, Cryptonatica oregonensis (T.A. Conrad, 1849 †) - (NATICIDAE) (FOSSIL)
- oregonensis, Bandelopsis oregonensis Frýda & al., 2003 † - (NERITOPSIDAE) (FOSSIL)
- oregonensis, Patinopecten oregonensis H.V.W. Howe, 1922 † - (PECTINIDAE) (FOSSIL)
- oregonensis, Planorbella oregonensis G.W. Tryon, 1865 - (PLANORBIDAE)
- oregonensis, Badouxia oregonensis Taylor, 1998 † - syn of: Badouxia canadensis (Frebold, 1951 †) - (PSILOCERATIDAE) (FOSSIL)
- oregonensis, Odostomia oregonensis W.H. Dall & P. Bartsch, 1907 - (PYRAMIDELLIDAE)
- oregonensis, Fusitriton oregonensis (J.H. Redfield, 1846) - (RANELLIDAE)
- oregonensis, Triton oregonensis R. Arnold, 1907 - syn of: Fusitriton oregonensis (J.H. Redfield, 1846) - (RANELLIDAE)
- oregonensis, Rimella oregonensis H. Turner, 1938 † - syn of: Macilentos macilentus (White, 1889 †) - (RIMELLIDAE) (FOSSIL)
- oregonensis, Succinea oregonensis I. Lea, 1841 - (SUCCINEIDAE)
- oregonensis, Cryptogemma oregonensis W.H. Dall, 1919 - (TURRIDAE)
- oregonensis, Turritella oregonensis (T.A. Conrad, 1849 †) - (TURRITELLIDAE) (FOSSIL)
- oregonensis, Anodonta oregonensis I. Lea, 1838 - (UNIONIDAE)
- oregonensis, Nephronaias oregonensis (I. Lea, 1852) - (UNIONIDAE)
- oregonensis cancellosus, Patinopecten oregonensis cancellosus (Moore †) - (PECTINIDAE) (FOSSIL)
- oregonensis galea, Fusitriton oregonensis galea J.T. Kuroda & T. Habe, 1961 - syn of: Fusitriton galea J.T. Kuroda & T. Habe, 1961 - (RANELLIDAE)
- oregonia, Paziella oregonia H.R. Bullis, 1964 - (MURICIDAE)
- Oregoniateuthis, syn of: Genus Lycoteuthis G.J. Pfeffer, 1900 (LYCOTEUTHIDAE)
- Oregoniceras, syn of: Genus Subprionocyclus Anderson, 1902 † (COLLIGNONICERATIDAE) (FOSSIL)
- Oregonites, syn of: Genus Canavaria Gemmellaro , 1886 † (HILDOCERATIDAE) (FOSSIL)
- oregonius, Gliabates oregonius G.R. Webb, 1959 - (HELMINTHOGLYPTIDAE)
- oreia, Paraboysidia oreia W.S.S. Van Benthem-Jutting, 1950 - (HYPSELOSTOMATIDAE)
- oreina, Clausilia rugosa oreina F. Käufel, 1929 - (CLAUSILIIDAE)
- oreina, Humboldtiana oreina F.G. Thompson & B.A. Brewer, 1999 - (HUMBOLDTIANIDAE)
- oreina, Amandana ripacurcica oreina (P. Fagot, 1888) - (HYGROMIIDAE)
- oreina, Orcula gularis oreina P. Ehrmann, 1933 - (ORCULIDAE)
- Oreina, syn of: Subgenus Tiberia (Orina) A.E.R. Agassiz, 1846 (PYRAMIDELLIDAE)
- oreinos, Clausilia oreinos F. Käufel, 1929 - syn of: Clausilia bidentata abietina (D. Dupuy, 1850) - (CLAUSILIIDAE)
- oreinos, Cochlodina laminata oreinos (A.J. Wagner, 1914) - (CLAUSILIIDAE)
- oreinos, Trochulus oreinos (A.J. Wagner, 1914) - (HYGROMIIDAE)
- oreinos scheerpeltzi, Trochulus oreinos scheerpeltzi E. Mikula, 1957 - (HYGROMIIDAE)
- orejasmirandai, Olivella orejasmirandai M.A. Klappenbach, 1986 - (OLIVELLIDAE)
- orekta, Ennucula orekta T. Iredale, 1939 - (NUCULIDAE)
- orellana, Clathrodrillia orellana W.H. Dall, 1927 - (DRILLIIDAE)
- orenburgensis, Uddenites orenburgensis Ruzhentsev, 1949 † - (MEDLICOTTIIDAE) (FOSSIL)
- orensis, Pseudoclymenia orensis Nalivkina, 1953 † - (PSEUDOCLYMENIIDAE) (FOSSIL)
- Oreobasis, Subgenus Juga (Oreobasis) J.D. Taylor, 1966 (SEMISULCOSPIRIDAE)
- Oreobba, Genus Oreobba H.A. Pilsbry, 1894 (CAMAENIDAE)
- oreodoxa, Cosmotriphora oreodoxa (A.A. Olsson & A. Harbison, 1953) - (TRIPHORIDAE)
- oreodoxa, Turritella oreodoxa A.A. Olsson, 1922 † - (TURRITELLIDAE) (FOSSIL)
- OREOHELICIDAE Pilsbry, 1939 - Family (GASTROPODA-HETEROBRANCHIA [Subclass]-PULMONATA [Infraclass]-STYLOMMATOPHORA [Order]-PUNCTOIDEA [Superfamily])
- Oreohelix, Genus Oreohelix H.A. Pilsbry, 1904 (OREOHELICIDAE)
- Oreohomorus, Subgenus Subulona (Oreohomorus) H.A. Pilsbry, 1919 (SUBULINIDAE)
- Oreokera, Genus Oreokera J. Stanisic, 1987 (CHAROPIDAE)
- Oreomava, Genus Oreomava J.A. Kershaw, 1956 (CHAROPIDAE)
- oreosoma, Atagema oreosoma W.H. Pease, 1863 - syn of: Atagema osseosa (E.F. Kelaart, 1859) - (DISCODORIDIDAE)
- Oreoterebra, Subgenus Terebra (Oreoterebra) Olsson, 1967 † (TEREBRIDAE) (FOSSIL)
- oresignum, Strioterebrum oresignum A.A. Olsson, 1964 † - (TEREBRIDAE) (FOSSIL)
- oresignum hadrum, Strioterebrum oresignum hadrum W.P. Woodring, 1970 - (TEREBRIDAE)
- oresta, Anadara halidonata oresta W.P. Woodring, 1925 - (ARCIDAE)
- Orestella, Genus Orestella Lupu, 1972 † (RADIOLITIDAE) (FOSSIL)
- Orestes, syn of: Genus Phymatopleura Girty, 1939 † (PHYMATOPLEURIDAE) (FOSSIL)
- orestes, Fumonelix orestes (L.R. Hubricht, 1975) - (POLYGYRIDAE)
- Orestia, syn of: Genus Orestella Lupu, 1972 † (RADIOLITIDAE) (FOSSIL)
- orestias, Paralaoma orestias H.B. Preston, 1913 - (PUNCTIDAE)
- Orestites, Genus Orestites Renz, 1911 † (CERATITIDA (UNASSIGNED)) (FOSSIL)
- oretanica, Ananterodonta oretanica Babin & Gutiérrez, 1985 † - (MODIOMORPHIDA (UNASSIGNED)) (FOSSIL)
- oretea, Hadriania oretea A. De Gregorio, 1885 - syn of: Hadriania craticulata (G.B. Brocchi, 1814) - (MURICIDAE)
- oreteus, Tandonia oreteus M. Lessona & C. Pollonera, 1882 - syn of: Tandonia sowerbyi (A.E.J. Férussac, 1823) - (MILACIDAE)
- Oretia, Genus Oretia Marwick, 1953 † (PERGAMIDIIDAE) (FOSSIL)
- orewa, Striodostomia orewa C.R. Laws, 1940 - (PYRAMIDELLIDAE)
- orfellensis, Anchura orfellensis Bricchi, 1950 † - (APORRHAIDAE) (FOSSIL)
- organensis, Liguus flammellus organensis W.J. Clench, 1934 - (ORTHALICIDAE)
- organensis, Ashmunella organensis H.A. Pilsbry, 1936 - (POLYGYRIDAE)
- organi, Hollandites organi Smith, 1914 † - syn of: Frechites occidentalis (Smith, 1914 †) - (BEYRICHITIDAE) (FOSSIL)
- organi, Glycymerita organi (L. C. King, 1934 †) - (GLYCYMERIDIDAE) (FOSSIL)
- organiaca, Pyrenaearia organiaca (P. Fagot, 1905) - (HYGROMIIDAE)
- organiacus, Obscurella organiacus P. Fagot, 1905 - syn of: Cochlostoma martorelli montsiccianum (A. Bofill, 1890) - (COCHLOSTOMATIDAE)
- organicola, Annularops semicana organicola (C. de la Torre & P. Bartsch, 1941) - (POMATIIDAE)
- organisans, Batolites organisans Monfort 1808 † - (HIPPURITIDA (UNASSIGNED)) (FOSSIL)
- Organoceras, Genus Organoceras Myczynski, 1976 † (AMMONOIDEA (UNASSIGNED)) (FOSSIL)
- Organocoptis, Genus Organocoptis M.L. Jaume & C. de la Torre, 1972 (UROCOPTIDAE)
- orghidani, Hohenwartiana orghidani A.V. Grossu, 1955 - (FERUSSACIIDAE)
- orgonensis, Helix orgonensis J. Germain, 1929 - syn of: Murella muralis (O.F. Müller, 1774) - (HELICIDAE)
- orianda, Xerosecta orianda Puzanov, 1925 - syn of: Xeropicta krynickii (Andrzeiewsky in I. Krynicki, 1833) - (HYGROMIIDAE)
- oribasus, Sandlingites oribasus (Dittmar, 1866 †) - (SANDLINGITIDAE) (FOSSIL)
- oribates, Herilla illyrica oribates (R. Sturany, 1909) - (CLAUSILIIDAE)
- oribates, Cochlostoma oribates C.A. Westerlund, 1885 - syn of: Cochlostoma tessellatum (E.A. Rossmässler, 1837) - (COCHLOSTOMATIDAE)
- Oricampylaea, syn of: Genus Campylaea H.H. Beck, 1837 (HELICIDAE)
- orichalceus, Trochus orichalceus R.A. Philippi, 1849 - syn of: Lithopoma phoebium (P.F. Röding, 1798) - (TROCHIDAE)
- Oriella, Subgenus Omphalotropis (Oriella) K.H.J. Thiele, 1927 (ASSIMINEIDAE)
- oriens, Gibberula oriens T. McCleery, 2008 - (CYSTISCIDAE)
- oriens, Fissurella oriens G.B. I Sowerby, 1834 - (FISSURELLIDAE)
- oriens, Deacheospira oriens (J. Perner, 1907 †) - (GOSSELETINIDAE) (FOSSIL)
- oriens, Helicotoma oriens J. Perner, 1903 † - (HELICOTOMIDAE) (FOSSIL)
- oriens, Ruanites oriens (Chlupac & Turek, 1983 †) - (MIMOSPHINCTIDAE) (FOSSIL)
- oriens, Nassa oriens F.P. Marrat, 1880 - syn of: Tritia casta (A.A. Gould, 1850) - (NASSARIIDAE)
- oriens, Gari oriens (G.P. Deshayes, 1855) - (PSAMMOBIIDAE)
- oriens, Psammobia oriens G.P. Deshayes, 1855 - syn of: Gari oriens (G.P. Deshayes, 1855) - (PSAMMOBIIDAE)
- oriens, Unio oriens I. Lea, 1831 - syn of: Hemistena lata C.S. Rafinesque, 1820 - (UNIONIDAE)
- oriens fulvescens, Fissurella oriens fulvescens G.B. I Sowerby, 1835 - (FISSURELLIDAE)
- orientale, Calycoceras orientale E. Matsumoto & al. 1957 † - (ACANTHOCERATIDAE) (FOSSIL)
- orientale, Newboldiceras orientale Thomel 1972 † - (ACANTHOCERATIDAE) (FOSSIL)
- orientale, Probeloceras orientale Bogoslovsky, 1958 † - syn of: Ponticeras orientale (Bogoslovsky, 1958 †) - (ACANTHOCLYMENIIDAE) (FOSSIL)
- orientale, Acrochordiceras orientale Zharnikova, 1981 † - syn of: Acrochordiceras hatschekii Diener, 1907 † - (ACROCHORDICERATIDAE) (FOSSIL)
- orientale, Dzhulfoceras orientale Zakharov, 1994 † - (ARAXOCERATIDAE) (FOSSIL)
- orientale, Caecum orientale P.P. Carpenter, 1868 - syn of: Caecum clarkii P.P. Carpenter, 1859 - (CAECIDAE)
- orientale, Cerion orientale W.J. Clench & C.G. Aguayo, 1951 - (CERIONIDAE)
- orientale, Chaetoderma orientale (H.A. Stork, 1941) - (CHAETODERMATIDAE)
- orientale, Yabeiceras orientale S. Tokunaga & Shimizu, 1926 † - (COLLIGNONICERATIDAE) (FOSSIL)
- orientale, Paradimorphoceras orientale Ruzhentsev & Bogoslovskaya, 1971 † - (DIMORPHOCERATIDAE) (FOSSIL)
- orientale, Phyllodesmium orientale K. Baba, 1991 - (FACELINIDAE)
- orientale, Syngastrioceras orientale (Yin, 1935 †) - (GLAPHYRITIDAE) (FOSSIL)
- orientale, Stenopoceras orientale Chao, 1940 † - (GRYPOCERATIDAE) (FOSSIL)
- orientale, Gyrophiceras orientale F.S. Xu, 1988 † - syn of: Xiaoqiaoceras involutus Brayard & Bucher, 2008 † - (GYRONITIDAE) (FOSSIL)
- orientale, Lepton orientale (J.C. Melvill, 1910) - (LASAEIDAE)
- orientale, Liroceras orientale J.K. Zhao, 1954 † - (LIROCERATIDAE) (FOSSIL)
- orientale, Bamyaniceras orientale Sone & al., 2001 † - (MEDLICOTTIIDAE) (FOSSIL)
- orientale, Meekoceras orientale Shimizu & Jimbo, 1933 † - (MEEKOCERATIDAE) (FOSSIL)
- orientale, Dalmasiceras orientale Sey & Kalacheva, 1999 † - (NEOCOMITIDAE) (FOSSIL)
- orientale, Orthoceras orientale Fliegel, 1901 † - (ORTHOCERATIDAE) (FOSSIL)
- orientale, Oxynoticeras orientale J.H.F. Douvillé, 1916 † - (OXYNOTICERATIDAE) (FOSSIL)
- orientale, Altudoceras orientale F.S. Xu, 1977 † - (PARAGASTRIOCERATIDAE) (FOSSIL)
- orientale, Amusium orientale A. Dey, 1961 † - (PECTINIDAE) (FOSSIL)
- orientale, Ponticeras orientale (Bogoslovsky, 1958 †) - (PONTICERATIDAE) (FOSSIL)
- orientale, Linwuceras orientale F.S. Xu, 1977 † - (PSEUDOHALORITIDAE) (FOSSIL)
- orientale, Reticuloceras orientale Ruzhencev & Bogoslovskaya, 1978 † - (RETICULOCERATIDAE) (FOSSIL)
- orientale, Pisidium orientale (L.A. Prozorova, 1995) - (SPHAERIIDAE)
- orientale, Amuropisidium orientale L.A. Prozorova, 1995 - syn of: Pisidium orientale (L.A. Prozorova, 1995) - (SPHAERIIDAE)
- orientale, Lopingoceras orientale (Fuegel, 1901 †) - (SPYROCERATIDAE) (FOSSIL)
- orientale, Tainoceras orientale Kayser, 1883 † - (TAINOCERATIDAE) (FOSSIL)
- orientale, Paradiscoceras orientale I.S. Barskov † - (TARPHYCERIDA (UNASSIGNED)) (FOSSIL)
- orientalia, Lophonema orientalia Yü, 1961 † - (HELICOTOMIDAE) (FOSSIL)
- Orientalina, syn of: Genus Radomaniola M. Szarowska, 2006 (HYDROBIIDAE)
- orientalis, Acroloxus orientalis N.D. Kruglov & Y.I. Starobogatov, 1991 - (ACROLOXIDAE)
- orientalis, Acteocina orientalis G.Y. Lin, 1983 - (ACTEOCINIDAE)
- orientalis, Nonactaeonina orientalis B. Wade, 1926 † - (ACTEONIDAE) (FOSSIL)
- orientalis, Aeolidiella orientalis L.S.R. Bergh, 1888 - syn of: Anteaeolidiella indica (L.S.R. Bergh, 1888) - (AEOLIDIIDAE)
- orientalis, Philinopsis orientalis (K. Baba, 1949) - (AGLAJIDAE)
- orientalis, Laminella venusta orientalis A. Hyatt & H.A. Pilsbry, 1911 - (AMASTRIDAE)
- orientalis, Amastra reticulata orientalis A. Hyatt & H.A. Pilsbry, 1911 - (AMASTRIDAE)
- orientalis, Ampullaria orientalis R.A. Philippi, 1849 - syn of: Pila scutata (A. Mousson, 1848) - (AMPULLARIIDAE)
- orientalis, Metriomphalus orientalis J.H.F. Douvillé, 1916 † - (ANGARIIDAE) (FOSSIL)
- orientalis, Goniocheila orientalis Abbass, 1967 † - (APORRHAIDAE) (FOSSIL)
- orientalis, Bathyarca orientalis (K.H.J. Thiele & S.G.A. Jaeckel, 1931) - (ARCIDAE)
- orientalis, Pleurophyllidiopsis orientalis G.Y. Lin, 1981 - (ARMINIDAE)
- orientalis, Aviculopecten orientalis Fredericks, 1934 † - (AVICULOPECTINIDAE) (FOSSIL)
- orientalis, Gervillella orientalis (J.H.F. Douvillé, 1916 †) - (BAKEVELLIIDAE) (FOSSIL)
- orientalis, Bellerophon orientalis de Koninck, 1863 † - (BELLEROPHONTIDAE) (FOSSIL)
- orientalis, Tylopoma orientalis (Papaianopol & Macale?, 1999 †) - (BITHYNIIDAE) (FOSSIL)
- orientalis, Pseudobornella orientalis K. Baba, 1932 - syn of: Dendronotus orientalis (K. Baba, 1932) - (BORNELLIDAE)
- orientalis, Maoritomella orientalis R.K. Dell, 1956 - (BORSONIIDAE)
- orientalis, Salpingostoma orientalis Twenhofel, 1928 † - (BUCANIIDAE) (FOSSIL)
- orientalis, Sulcosinus orientalis A.N. Golikov & V.V. Gulbin, 1977 - (BUCCINIDAE)
- orientalis, Neopetraeus catamarcanus orientalis A.S.H. Breure, 1978 - (BULIMULIDAE)
- orientalis, Bulla orientalis T. Habe, 1950 - syn of: Bulla punctulata A. Adams in G.B. II Sowerby, 1850 - (BULLIDAE)
- orientalis, Polybranchia orientalis (E.F. Kelaart, 1858) - (CALIPHYLLIDAE)
- orientalis, Nanotrachia orientalis (G.A. Solem, 1984) - (CAMAENIDAE)
- orientalis, Mouldingia orientalis G.A. Solem, 1984 - syn of: Nanotrachia orientalis (G.A. Solem, 1984) - (CAMAENIDAE)
- orientalis, Trichotropis orientalis M.M. Schepman, 1909 - syn of: Akibumia orientalis (M.M. Schepman, 1909) - (CAPULIDAE)
- orientalis, Cyclocardia orientalis L. Krishtofovich, 1984 † - (CARDITIDAE) (FOSSIL)
- orientalis, Paraceratites orientalis Yabe & Shimizu, 1927 † - (CERATITIDAE) (FOSSIL)
- orientalis, Cerithiopsis orientalis H.B. Preston, 1905 - (CERITHIOPSIDAE)
- orientalis, Chondrina orientalis H. Nordsieck, 1962 - syn of: Chondrina multidentata schista (C.A. Westerlund, 1887) - (CHONDRINIDAE)
- orientalis, Chromodoris orientalis W.B. Rudman, 1983 - (CHROMODORIDIDAE)
- orientalis, Tropidauchenia orientalis (J.F. Mabille, 1887) - (CLAUSILIIDAE)
- orientalis, Oospira orientalis (L. Pfeiffer, 1842) - (CLAUSILIIDAE)
- orientalis, Mentissa gracilicosta orientalis (A.A. Baidashnikov, 1990) - (CLAUSILIIDAE)
- orientalis, Phrygica riedeli orientalis H. Nordsieck, 2004 - (CLAUSILIIDAE)
- orientalis, Alinda biplicata orientalis H. Nordsieck, 2008 - (CLAUSILIIDAE)
- orientalis, Cochlicella orientalis P.M. Pallary, 1929 - syn of: Cochlicella barbara (C. Linnaeus, 1758) - (COCHLICELLIDAE)
- orientalis, Latouchella orientalis (Walcott, 1905 †) - (COREOSPIRIDAE) (FOSSIL)
- orientalis, Idonearca orientalis J.H.F. Douvillé, 1916 † - (CUCULLAEIDAE) (FOSSIL)
- orientalis, Cardiomya orientalis (K.H.J. Thiele & S.G.A. Jaeckel, 1931) - (CUSPIDARIIDAE)
- orientalis, Cylichna orientalis M. Yokoyama, 1920 † - syn of: Adamnestia japonica (A. Adams, 1862) - (CYLICHNIDAE) (FOSSIL)
- orientalis, Zoila orientalis G. Raybaudi Massilia, 1985 - (CYPRAEIDAE)
- orientalis, Cribrarula cribraria orientalis T. Iredale, 1930 - (CYPRAEIDAE)
- orientalis, Cypraeovula fuscodentata orientalis (J.E. Gray, 1825) - (CYPRAEIDAE)
- orientalis, Cyrena orientalis G.P. Deshayes, 1835 - syn of: Corbicula fluminea (O.F. Müller, 1774) - (CYRENIDAE)
- orientalis, Cyrena orientalis J.B.P.A. Lamarck, 1818 - syn of: Corbicula fluminea (O.F. Müller, 1774) - (CYRENIDAE)
- orientalis, Pricella orientalis (E. Perna, 1914 †) - (CYRTOCLYMENIIDAE) (FOSSIL)
- orientalis, Dendronotus orientalis (K. Baba, 1932) - (DENDRONOTIDAE)
- orientalis, Mesopuzosia intermedia orientalis E. Matsumoto, 1954 † - (DESMOCERATIDAE) (FOSSIL)
- orientalis, Obtortio orientalis (M. Yokoyama †) - (DIASTOMATIDAE) (FOSSIL)
- orientalis, Arinia brevispira orientalis J.J. Vermeulen, 1996 - (DIPLOMMATINIDAE)
- orientalis, Halgerda orientalis G.Y. Lin, 1991 - (DISCODORIDIDAE)
- orientalis, Discohelix orientalis Zhu, 1995 † - (DISCOHELICIDAE) (FOSSIL)
- orientalis, Napaeus orientalis F.C. Henríquez, 1995 - (ENIDAE)
- orientalis, Chondrula orientalis L. Pfeiffer, 1848 - (ENIDAE)
- orientalis, Cylindriscala orientalis (K.H.J. Thiele, 1925) - (EPITONIIDAE)
- orientalis, Epitonium orientalis K.H.J. Thiele, 1925 - syn of: Cylindriscala orientalis (K.H.J. Thiele, 1925) - (EPITONIIDAE)
- orientalis, Eucycloidea orientalis Pan, 1977 † - (EUCYCLIDAE) (FOSSIL)
- orientalis, Molpadicola orientalis Grusov, 1957 - (EULIMIDAE)
- orientalis, Falsicolus orientalis J. Marwick, 1931 † - (FASCIOLARIIDAE) (FOSSIL)
- orientalis, Rohillites orientalis Smyshlyaeva & Zakharov, 2015 † - (FLEMINGITIDAE) (FOSSIL)
- orientalis, Anaxenaspis orientalis (Diener, 1895 †) - (FLEMINGITIDAE) (FOSSIL)
- orientalis, Aclistothyra orientalis C.F. Lützen & C. Nielsen, 2005 - (GALEOMMATIDAE)
- orientalis, Fayettevillea orientalis Ruzhentsev & Bogoslovskaya, 1971 † - (GLAPHYRITIDAE) (FOSSIL)
- orientalis, Goniatites orientalis Librovitch, 1940 † - (GONIATITIDAE) (FOSSIL)
- orientalis, Shwedagonia orientalis Pan, 1985 † - (GOSSELETINIDAE) (FOSSIL)
- orientalis, Gryphaea orientalis E. Forbes, 1846 † - (GRYPHAEIDAE) (FOSSIL)
- orientalis, Anatomites orientalis Liang, 1977 † - (HALORITIDAE) (FOSSIL)
- orientalis, Igorella orientalis C. Chen & al., 1981 † - (HELCIONELLIDAE) (FOSSIL)
- orientalis, Beshtashella orientalis Z.X. Qian & Zhang, 1983 † - syn of: Beshtashella tortilis Missarzhevsky & Mambetov, 1981 † - (HELCIONELLOIDEA (unassigned)) (FOSSIL)
- orientalis, Paraformichella orientalis Z.X. Qian & Zhang, 1983 † - syn of: Beshtashella tortilis Missarzhevsky & Mambetov, 1981 † - (HELCIONELLOIDEA (unassigned)) (FOSSIL)
- orientalis, Tingitana orientalis (O. Böttger, 1884) - (HELICIDAE)
- orientalis, Pleuropoma kauaiensis orientalis M.C. Neal, 1934 - (HELICINIDAE)
- orientalis, Aplysiopsis orientalis (K. Baba, 1949) - (HERMAEIDAE)
- orientalis, Panopea orientalis E. Forbes, 1846 - (HIATELLIDAE)
- orientalis, Hiatella arctica orientalis M. Yokoyama, 1920 - (HIATELLIDAE)
- orientalis, Haedropleura orientalis E.W. Vredenburg, 1923 † - (HORAICLAVIDAE) (FOSSIL)
- orientalis, Micromelania orientalis Willmann, 1981 † - (HYDROBIIDAE) (FOSSIL)
- orientalis, Pseudamnicola orientalis (Bukowski, 1896 †) - (HYDROBIIDAE) (FOSSIL)
- orientalis, Akiyoshia orientalis Kabe, 1986 - (HYDROBIIDAE)
- orientalis, Kalitinaia orientalis (K.K. Uvalieva & Sacharnova, 1995) - (HYGROMIIDAE)
- orientalis, Lanceolites orientalis Chao, 1959 † - syn of: Lanceolites bicarinatus Smith, 1932 † - (LANCEOLITIDAE) (FOSSIL)
- orientalis, Akibumia orientalis (M.M. Schepman, 1909) - (LAUBIERINIDAE)
- orientalis, Paralimax orientalis H.R. Simroth, 1912 - syn of: Eumilax intermittens (O. Böttger, 1883) - (LIMACIDAE)
- orientalis, Limaria orientalis (Adams & Reve, 1850 †) - (LIMIDAE) (FOSSIL)
- orientalis, Limaria orientalis (A. Adams & L.A. Reeve, 1850) - (LIMIDAE)
- orientalis, Limaria orientalis R.N. Kilburn, 1998 - syn of: Limaria africana (P. Bartsch, 1915) - (LIMIDAE)
- orientalis, Lacuna orientalis (A.N. Golikov & V.V. Gulbin, 1985) - (LITTORINIDAE)
- orientalis, Ectomaria orientalis (J. Donald, 1906 †) - (LOPHOSPIRIDAE) (FOSSIL)
- orientalis, Worthenia orientalis (F.A. Roemer, 1880 †) - (LOPHOSPIRIDAE) (FOSSIL)
- orientalis, Omospira orientalis J. Donald, 1906 † - syn of: Ectomaria orientalis (J. Donald, 1906 †) - (LOXONEMATIDAE) (FOSSIL)
- orientalis, Valenciennius orientalis (V.V. Bogachev, 1931 †) - (LYMNAEIDAE) (FOSSIL)
- orientalis, Lyocyclus orientalis K.H.J. Thiele, 1925 - (LYOCYCLIDAE)
- orientalis, Maclurites orientalis Yü, 1961 † - (MACLURITIDAE) (FOSSIL)
- orientalis, Bela orientalis K.H.J. Thiele, 1925 - (MANGELIIDAE)
- orientalis, Serrata orientalis F. Boyer, 2008 - (MARGINELLIDAE)
- orientalis, Medlicottia orientalis Liang, 1981 † - (MEDLICOTTIIDAE) (FOSSIL)
- orientalis, Synartinskia orientalis Leonova, 1992 † - (MEDLICOTTIIDAE) (FOSSIL)
- orientalis, Neouddenites orientalis Bogoslovskaya, 1991 † - (MEDLICOTTIIDAE) (FOSSIL)
- orientalis, Ambitoides orientalis Y. Shigeta & Zakharov, 2009 † - (MEEKOCERATIDAE) (FOSSIL)
- orientalis, Prosphingitoides orientalis (Kiparisova, 1961 †) - (MELAGATHICERATIDAE) (FOSSIL)
- orientalis, Juvenites orientalis Chao, 1959 † - syn of: Juvenites sinuosus Kiparisova, 1947 † - (MELAGATHICERATIDAE) (FOSSIL)
- orientalis, Melanopsis orientalis Bukowski, 1892 † - (MELANOPSIDAE) (FOSSIL)
- orientalis, Rhombopsis orientalis B. Wade, 1926 † - (MELONGENIDAE) (FOSSIL)
- orientalis, Mitra orientalis E. Griffith & E. Pidgeon, 1834 - (MITRIDAE)
- orientalis, Paladilhiopsis orientalis Y.I. Starobogatov, 1962 - (MOITESSIERIIDAE)
- orientalis, Chicoreus orientalis S.P. Zhang, 1965 - syn of: Chicoreus asianus J.T. Kuroda, 1942 - (MURICIDAE)
- orientalis, Gervillia orientalis J.H.F. Douvillé, 1916 † - syn of: Gervillella orientalis (J.H.F. Douvillé, 1916 †) - (MYALINIDAE) (FOSSIL)
- orientalis, Myophorella orientalis O. Kobayashi & Tamura, 1955 † - (MYOPHORELLIDAE) (FOSSIL)
- orientalis, Mysidiella orientalis (Bittner 1891) † - (MYSIDIELLIDAE) (FOSSIL)
- orientalis, Cellana radiata orientalis (H.A. Pilsbry, 1891) - (NACELLIDAE)
- orientalis, Cyllene orientalis A. Adams, 1851 - (NASSARIIDAE)
- orientalis, Naticarius orientalis (J.F. Gmelin, 1791) - (NATICIDAE)
- orientalis, Natica orientalis J.F. Gmelin, 1791 - syn of: Naticarius orientalis (J.F. Gmelin, 1791) - (NATICIDAE)
- orientalis, Nautilus orientalis Kayser, 1883 † - syn of: Tainoceras orientale Kayser, 1883 † - (NAUTILIDAE) (FOSSIL)
- orientalis, Nerita orientalis J.F. Gmelin, 1791 - syn of: Naticarius orientalis (J.F. Gmelin, 1791) - (NERITIDAE)
- orientalis, Notabilitus orientalis A.V. Sysoev, 1968 † - (NOTABILITIDAE) (FOSSIL)
- orientalis, Portlandella orientalis L. Krishtofovich, 1969 † - (NUCULANIDAE) (FOSSIL)
- orientalis, Nuculopsis orientalis M. Ichikawa, 1951 † - (NUCULIDAE) (FOSSIL)
- orientalis, Onchidella orientalis (Iw. Taki, 1935) - (ONCHIDIIDAE)
- orientalis, Vishnuites orientalis F.S. Xu, 1988 † - syn of: Vishnuites pralambha Diener, 1897 † - (OPHICERATIDAE) (FOSSIL)
- orientalis, Orculella orientalis (L. Pfeiffer, 1861) - (ORCULIDAE)
- orientalis, Radiocentrum orientalis A. Metcalf, 1980 - (OREOHELICIDAE)
- orientalis, Ostrea orientalis L.W. Dillwyn, 1817 - syn of: Crassostrea bilineata (P.F. Röding, 1798) - (OSTREIDAE)
- orientalis, Oxychilus orientalis S. Clessin, 1877 - syn of: Cellariopsis orientalis (S. Clessin, 1877) - (OXYCHILIDAE)
- orientalis, Trigonodus orientalis (Bittner, 1899 †) - (PACHYCARDIIDAE) (FOSSIL)
- orientalis, Palaeonarica orientalis Pan, 1977 † - (PALAEONARICIDAE) (FOSSIL)
- orientalis, Daubichites orientalis A.M. Popov, 1963 † - (PARAGASTRIOCERATIDAE) (FOSSIL)
- orientalis, Cucullaria orientalis M. Yokoyama, 1922 - syn of: Porterius dalli (E.A. Smith, 1885) - (PARALLELODONTIDAE)
- orientalis, Pectinodonta orientalis M.M. Schepman, 1908 - (PECTINODONTIDAE)
- orientalis, Philine orientalis A. Adams, 1854 - (PHILINIDAE)
- orientalis, Yokoyamaia orientalis G.Y. Lin, 1971 - (PHILINIDAE)
- orientalis, Pholas orientalis J.F. Gmelin, 1791 - (PHOLADIDAE)
- orientalis, Pholadomya orientalis J.H.F. Douvillé, 1916 † - (PHOLADOMYIDAE) (FOSSIL)
- orientalis, Cephalopyge orientalis K. Baba, 1933 - syn of: Cephalopyge trematoides (C. Chun, 1889) - (PHYLLIROIDAE)
- orientalis, Aplexa orientalis Y.I. Starobogatov, 1992 - (PHYSIDAE)
- orientalis, Elysia orientalis J.A. Ortea, L. Moro, G.M. Caballer & J. Espinosa, 2011 - (PLAKOBRANCHIDAE)
- orientalis, Planorbis orientalis G.A. Olivier - syn of: Planorbis planorbis (C. Linnaeus, 1758) - (PLANORBIDAE)
- orientalis, Trigonoclymenia orientalis Nikolaeva & Ivanovich, 2005 † - (PLATYCLYMENIIDAE) (FOSSIL)
- orientalis, Pleurotomaria orientalis F.A. Roemer, 1880 † - syn of: Worthenia orientalis (F.A. Roemer, 1880 †) - (PLEUROTOMARIIDAE) (FOSSIL)
- orientalis, Kaloplocamus orientalis K.H.J. Thiele, 1925 - syn of: Kaloplocamus ramosus (F.J. Cantraine, 1835) - (POLYCERIDAE)
- orientalis, Cetomya orientalis (K.H.J. Thiele & S.G.A. Jaeckel, 1931) - (POROMYIDAE)
- orientalis, Discoclymenia orientalis W. Korn, Bartzsch & Weyer, 2016 † - (POSTTORNOCERATIDAE) (FOSSIL)
- orientalis, Vitrea orientalis M. von Kimakowicz, 1883 - syn of: Vitrea crystallina (O.F. Müller, 1774) - (PRISTILOMATIDAE)
- orientalis, Proctonotus orientalis E.F. Kelaart, 1858 - syn of: Polybranchia orientalis (E.F. Kelaart, 1858) - (PROCTONOTIDAE)
- orientalis, Pronorites orientalis Renz & Renz, 1948 † - syn of: Albanites arbanus (Arthaber, 1911 †) - (PRONORITIDAE) (FOSSIL)
- orientalis, Prosocoelus orientalis Zhang, 1977 † - (PROSOCOELIDAE) (FOSSIL)
- orientalis, Pseudotirolites orientalis Chao & Liang, 1965 † - (PSEUDOTIROLITIDAE) (FOSSIL)
- orientalis, Pugnellus orientalis Lees, 1928 † - (PUGNELLIDAE) (FOSSIL)
- orientalis, Parthenina orientalis (S. Nomura, 1936) - (PYRAMIDELLIDAE)
- orientalis, Cymatium orientalis G. Nevill & H. Nevill, 1874 - syn of: Turritriton labiosus (Wood, 1828) - (RANELLIDAE)
- orientalis, Thatcheriasyrinx orientalis J.C. Melvill, 1904 - syn of: Thatcheriasyrinx orientis (J.C. Melvill, 1904) - (RAPHITOMIDAE)
- orientalis, Ringicula orientalis G.Y. Lin, 1985 - (RINGICULIDAE)
- orientalis, Attenuata orientalis (R.K. Dell, 1956) - (RISSOIDAE)
- orientalis, Nobolira orientalis R.K. Dell, 1956 - syn of: Attenuata orientalis (R.K. Dell, 1956) - (RISSOIDAE)
- orientalis, Jaitlygonia orientalis (Forbes, 1845) † - (RUTITRIGONIIDAE) (FOSSIL)
- orientalis, Finella orientalis M. Yokoyama, 1920 - syn of: Cerithidium fuscum (A. Adams, 1860) - (SCALIOLIDAE)
- orientalis, Crosslandia orientalis K.H.J. Thiele, 1925 - syn of: Crosslandia viridis C.N.E. Eliot, 1902 - (SCYLLAEIDAE)
- orientalis, Seguenzia orientalis K.H.J. Thiele, 1925 - (SEGUENZIIDAE)
- orientalis, Solen orientalis R.W. Dunker, 1850 - syn of: Cultellus maximus (J.F. Gmelin, 1791) - (SOLENIDAE)
- orientalis, Eosteinmannites orientalis Tozer, 1994 † - (STEINMANNITIDAE) (FOSSIL)
- orientalis, Streptacis orientalis A. Nützel & Nakazawa, 2012 † - (STREPTACIDIDAE) (FOSSIL)
- orientalis, Strombus orientalis P.L. Duclos in J.C. Chenu, 1844 - syn of: Tricornis tricornis (J. Lightfoot, 1786) - (STROMBIDAE)
- orientalis, Sibyllonautilus orientalis E.S. Sobolev, 1989 † - (TAINOCERATIDAE) (FOSSIL)
- orientalis, Tapashanites orientalis F.S. Xu, 1977 † - (TAPASHANITIDAE) (FOSSIL)
- orientalis, Cymatoica orientalis W.H. Dall, 1890 - (TELLINIDAE)
- orientalis, Macoma orientalis O.A. Scarlato, 1967 † - syn of: Macoma scarlatoi A.I. Kafanov & K.A. Lutaenko, 1997 † - (TELLINIDAE) (FOSSIL)
- orientalis, Myurella orientalis (U. Aubry, 1999) - (TEREBRIDAE)
- orientalis, Bankia orientalis G.F. Roch, 1929 - syn of: Bankia carinata (J.E. Gray, 1827) - (TEREDINIDAE)
- orientalis, Trigonia orientalis J.H.F. Douvillé, 1916 † - (TRIGONIIDAE) (FOSSIL)
- orientalis, Trigonia orientalis E. Forbes, 1846 † - (TRIGONIIDAE) (FOSSIL)
- orientalis, Pseudomilax orientalis H.R. Simroth, 1912 - syn of: Drilolestes retowskii (O. Böttger, 1884) - (TRIGONOCHLAMYDIDAE)
- orientalis, Pusula orientalis Schilder, 1939 † - (TRIVIIDAE) (FOSSIL)
- orientalis, Jujubinus orientalis F. Nordsieck, 1973 - syn of: Jujubinus elenchoides (A. Issel, 1878) - (TROCHIDAE)
- orientalis, Elongaria orientalis (Lea, 1840) - (UNIONIDAE)
- orientalis, Unio orientalis J.R. Bourguignat, 1852 - syn of: Unio crassus L. Philipsson in A. Retzius, 1788 - (UNIONIDAE)
- orientalis, Microceramus orientalis C.G. Aguayo, 1935 - (UROCOPTIDAE)
- orientalis, Valvata orientalis Fischer in Tchihatcheff, 1866 † - (VALVATIDAE) (FOSSIL)
- orientalis, Globivenus orientalis (L.R. Cox, 1930) - (VENERIDAE)
- orientalis, Flaventia orientalis J.H.F. Douvillé, 1916 † - (VENERIDAE) (FOSSIL)
- orientalis, Cyclina orientalis (G.B. II Sowerby, 1852) - (VENERIDAE)
- orientalis, Tapes orientalis L.A. Reeve, 1864 - syn of: Marcia recens (H.S. Holten, 1802) - (VENERIDAE)
- orientalis, Lioplacodes orientalis Yu, 1974 † - (VIVIPARIDAE) (FOSSIL)
- orientalis, Portlandia orientalis L. Krishtofovich, 1969 † - syn of: Portlandella orientalis L. Krishtofovich, 1969 † - (YOLDIIDAE) (FOSSIL)
- orientalis, Schwartziella orientalis G. Nevill - (ZEBINIDAE)
- orientalis, Cellariopsis orientalis (S. Clessin, 1877) - (ZONITIDAE)
- orientalis, Spelaeopatula orientalis I. Dedov & P. Subai, 2012 - (ZONITIDAE)
- orientalis biliottii, Melanopsis orientalis biliottii Bukowski, 1892 † - (MELANOPSIDAE) (FOSSIL)
- orientalis gabensis, Zoila orientalis gabensis J. Van Heesvelde & J. Deprez, 2007 - (CYPRAEIDAE)
- orientalis hendersoni, Macoma orientalis hendersoni H.A. Rehder, 1939 - syn of: Cymatoica orientalis W.H. Dall, 1890 - (TELLINIDAE)
- orientalis hendersoni, Cymatoica orientalis hendersoni H.A. Rehder, 1939 - syn of: Cymatoica orientalis W.H. Dall, 1890 - (TELLINIDAE)
- orientalis kawamurai, Thatcheriasyrinx orientalis kawamurai J.T. Kuroda, 1959 - syn of: Thatcheriasyrinx orientis kawamurai (J.T. Kuroda, 1959) - (RAPHITOMIDAE)
- orientalis messageri, Tropidauchenia orientalis messageri H. Nordsieck, 2007 - (CLAUSILIIDAE)
- orientalis roseni, Helix orientalis roseni P. Hesse, 1914 - syn of: Paratheba roseni (P. Hesse, 1914) - (HELICIDAE)
- orientalis rufocincta, Tropidauchenia orientalis rufocincta H. Nordsieck, 2007 - (CLAUSILIIDAE)
- orientalis scalarata, Micromelania orientalis scalarata Willmann, 1981 † - (HYDROBIIDAE) (FOSSIL)
- orientalis subcartusiana, Monacha orientalis subcartusiana W.A. Lindholm, 1913 - syn of: Metatheba subcarthusiana (W.A. Lindholm, 1913) - (HYGROMIIDAE)
- orientica, Turbonilla orientica J.X. Corgan, 1970 - (PYRAMIDELLIDAE)
- Orienticoptis, Subgenus Cochlodinella (Orienticoptis) M.L. Jaume & C. de la Torre, 1972 (UROCOPTIDAE)
- orientis, Sonorella orientis H.A. Pilsbry, 1936 - (HELMINTHOGLYPTIDAE)
- orientis, Testudovolva orientis C.N. Cate, 1973 - (OVULIDAE)
- orientis, Thatcheriasyrinx orientis (J.C. Melvill, 1904) - (RAPHITOMIDAE)
- orientis kawamurai, Thatcheriasyrinx orientis kawamurai (J.T. Kuroda, 1959) - (RAPHITOMIDAE)
- Orientogalba, Genus Orientogalba N.D. Kruglov & Y.I. Starobogatov, 1985 (LYMNAEIDAE)
- Orientopecten, syn of: Genus Leptochondria Bittner , 1891 † (LEIOPECTINIDAE) (FOSSIL)
- Orientopecten, syn of: Genus Leptochondria Bittner , 1891 † (LEIOPECTINIDAE) (FOSSIL)
- orientus, Quemocuomegalodon orientus Yao & al., 2003 † - (MEGALODONTIDAE) (FOSSIL)
- oriettae, Umbilia oriettae F.Jr. Lorenz & D. Massiglia, 2005 - (CYPRAEIDAE)
- oriflavens, Vexillum oriflavens J.C. Melvill, 1925 - syn of: Nodicostellaria laterculata (G.B. II Sowerby, 1874) - (COSTELLARIIDAE)
- Oriforina, Subgenus Triphora (Oriforina) J. Gründel, 1975 (TRIPHORIDAE)
- originale, Parakionoceras originale (Barrande, 1868 †) - (ARIONOCERATIDAE) (FOSSIL)
- originale, Cravenoceras originale Ruzhentsev & Bogoslovskaya, 1971 † - (CRAVENOCERATIDAE) (FOSSIL)
- originale, Diceras originale C.É. Bayle, 1873 † - (DICERATIDAE) (FOSSIL)
- originalis, Juresanites originalis Shkolin, 1992 † - (METALEGOCERATIDAE) (FOSSIL)
- originalis, Retroceramus originalis Koschelkina, 1985 † - (RETROCERAMIDAE) (FOSSIL)
- originis, Isculitoides originis (Arthaber, 1911 †) - (PARAGOCERATIDAE) (FOSSIL)
- origolacus, Lentidium origolacus A. Hallan & R.C. Willan, 2010 - (CORBULIDAE)
- orilliense, Beloitoceras orilliense Flower, 1952 † - (ONCOCERATIDAE) (FOSSIL)
- orina, Inchoatia haussknechti orina (C.A. Westerlund, 1894) - (CLAUSILIIDAE)
- orina, Helminthoglypta orina S.S. Berry, 1938 - (HELMINTHOGLYPTIDAE)
- Orina, Subgenus Tiberia (Orina) A.E.R. Agassiz, 1846 (PYRAMIDELLIDAE)
- Orinella, Subgenus Tiberia (Orinella) W.H. Dall & P. Bartsch, 1904 (PYRAMIDELLIDAE)
- orinini, Euomphalus orinini Wenjukov, 1899 † - syn of: Pachystrophia orinini (Wenjukov, 1899 †) - (EUOMPHALIDAE) (FOSSIL)
- orinini, Pachystrophia orinini (Wenjukov, 1899 †) - (HOLOPEIDAE) (FOSSIL)
- orinoccensis, Ampullaria orinoccensis F.H. Troschel, 1848 - syn of: Pomacea glauca (C. Linnaeus, 1758) - (AMPULLARIIDAE)
- orinocensis, Castalia orinocensis J.P.E. Morrison, 1943 - syn of: Castalia stevensi (F.C. Baker, 1930) - (HYRIIDAE)
- orinus, Naesiotus quitensis orinus H.A. Rehder, 1940 - (BULIMULIDAE)
- Oriocrassatella, Genus Oriocrassatella Etheridge Jr., 1907 † (ORIOCRASSATELLIDAE) (FOSSIL)
- ORIOCRASSATELLIDAE Boyd & Newell, 1968 † - Family (BIVALVIA-HETERODONTA [Subclass]-ARCHIHETERODONTA [Infraclass]-ACTINODONTIDA [Order]-ORIOCRASSATELLOIDEA [Superfamily]) (FOSSIL)
- oriola, Oliva tigridella oriola J.B.P.A. Lamarck, 1811 - (OLIVIDAE)
- Oriomphalus, Genus Oriomphalus Horný, 1992 † (ORIOSTOMATIDAE) (FOSSIL)
- orion, Calliostoma orion W.H. Dall, 1889 - (CALLIOSTOMATIDAE)
- orion, Poremskiconus orion (W.J. Broderip, 1833) - (CONIDAE)
- orion, Protissotia orion T.L. Casey, 1965 † - syn of: Protissotia itierianum d'Orbigny, 1841 † - (LYELLICERATIDAE) (FOSSIL)
- Orionoides, Genus Orionoides Spath, 1931 † (PERISPHINCTIDAE) (FOSSIL)
- Oriostoma, Genus Oriostoma Munier-Chalmas, 1876 † (ORIOSTOMATIDAE) (FOSSIL)
- ORIOSTOMATIDAE Koken, 1896 † - Family (GASTROPODA-NERITIMORPHA [Subclass]-ORIOSTOMATOIDEA [Superfamily]) (FOSSIL)
- orirufa, Etrema orirufa C. Hedley, 1922 - (CLATHURELLIDAE)
- orisparvi, Obtusella orisparvi Moreno, A. Peñas & E. Rolán, 2003 † - (RISSOIDAE) (FOSSIL)
- orissaensis, Nassarius orissaensis (H.B. Preston, 1914) - (NASSARIIDAE)
- orissaensis ennurensis, Nassa orissaensis ennurensis H.B. Preston, 1916 - syn of: Nassarius orissaensis (H.B. Preston, 1914) - (NASSARIIDAE)
- orites, Electrina succinea orites C.M. Cooke & W.J. Clench, 1943 † - (ASSIMINEIDAE) (FOSSIL)
- orites, Oospira penangensis orites (F.F. Laidlaw, 1931) - (CLAUSILIIDAE)
- orites, Helix orites C.A. Westerlund, 1889 - syn of: Marmorana serpentina orites C.A. Westerlund, 1889 - (HELICIDAE)
- orites, Marmorana serpentina orites C.A. Westerlund, 1889 - (HELICIDAE)
- orithyia, Pliocathaica orithyia (Von Martens, 1879 †) - (BRADYBAENIDAE) (FOSSIL)
- orithyia, Helix orithyia E.C. Von Martens, 1874 - syn of: Fruticicola phaeozona (E.C. Von Martens, 1874) - (HELICIDAE)
- orithyia, Scenella orithyia (Billings, 1865 †) - (SCENELLIDAE) (FOSSIL)
- oritis, Holospira oritis H.A. Pilsbry & E.P. Cheatum, 1951 - (UROCOPTIDAE)
- orius, Vespericola orius (S.S. Berry, 1933) - (POLYGYRIDAE)
- orixa, Ledella orixa (W.H. Dall, 1927) - (NUCULANIDAE)
- orixa, Leda orixa P. Bartsch, 1915 - syn of: Ledella orixa (W.H. Dall, 1927) - (NUCULANIDAE)
- orixa, Leda orixa W.H. Dall, 1927 - syn of: Ledella orixa (W.H. Dall, 1927) - (NUCULANIDAE)
- Orixa, syn of: Genus Abra J.B.P.A. Lamarck, 1818 (SEMELIDAE)
- oriza, Eucithara oriza (R.B. Hinds, 1843) - (MANGELIIDAE)
- orizabae, Proameria orizabae (L. Pfeiffer, 1856) - (SPIRAXIDAE)
- orizabensis, Amnicola orizabensis J.C.H. Crosse & P.H. Fischer, 1891 - syn of: Aroapyrgus orizabensis (J.C.H. Crosse & P.H. Fischer, 1891) - (AMNICOLIDAE)
- orizabensis, Aroapyrgus orizabensis (J.C.H. Crosse & P.H. Fischer, 1891) - (COCHLIOPIDAE)
- orizabensis, Pseudosubulina orizabensis H.A. Pilsbry, 1907 - (SPIRAXIDAE)
- Orizosoma, syn of: Genus Oryzosoma H.A. Pilsbry, 1891 (OLEACINIDAE)
- orlandoi, Siciliaria calcarae orlandoi (Libero, A. Reitano & al., 2016) - (CLAUSILIIDAE)
- orleanus, Conus orleanus P.F. Röding, 1798 - syn of: Strategoconus litoglyphus (C.H. Hwass in J.G. Bruguière, 1792) - (CONIDAE)
- orlejensis, Palaeozygopleura orlejensis Gromczakiewicz-Lomnicka, 1972 † - (PALAEOZYGOPLEURIDAE) (FOSSIL)
- orlini, Lunulicardia orlini H.K. Mienis, 2009 - (CARDIIDAE)
- orloffensis, Mastoides orloffensis (W. Kobelt, 1905) - (ENIDAE)
- orlovkensis, Corbicula orlovkensis Devjatilova, 1980 † - (CYRENIDAE) (FOSSIL)
- orlovkensis, Pitar orlovkensis Devjatilova, 1991 † - syn of: Pitar altoumbonatum (T. Nagao, 1928 †) - (VENERIDAE) (FOSSIL)
- ormarense, Eudolium ormarense E.W. Vredenburg, 1925 † - (TONNIDAE) (FOSSIL)
- ormarensis, Semicassis ormarensis E.W. Vredenburg, 1925 † - (CASSIDAE) (FOSSIL)
- Ormastralium, syn of: Genus Bolma A. Risso, 1826 (TURBINIDAE)
- ormeai, Epiphragmophora ormeai W.K. Weyrauch, 1956 - (EPIPHRAGMOPHORIDAE)
- ormei, Potamides ormei C.J. Maury, 1917 † - syn of: Dentimides suprasulcatus (W.M. Gabb, 1873 †) - (POTAMIDIDAE) (FOSSIL)
- ormenoi, Muracypraea ormenoi DeVries & al., 2006 † - (CYPRAEIDAE) (FOSSIL)
- ormesi, Penion ormesi (A.W.B. Powell, 1927) - (BUCCINIDAE)
- ormistoni, Kitikamispira ormistoni (Blodgett, 1992 †) - (EUOMPHALOIDEA (UNASSIGNED)) (FOSSIL)
- ormistoni, Kitakamispira ormistoni Blodgett, 1992 † - syn of: Kitikamispira ormistoni (Blodgett, 1992 †) - (EUOMPHALOIDEA (unassigned)) (FOSSIL)
- ormistoni, Gyronema ormistoni Blodgett, 1992 † - syn of: Kitikamispira ormistoni (Blodgett, 1992 †) - (LOPHOSPIRIDAE) (FOSSIL)
- Ormoceras, Genus Ormoceras Stokes, 1840 † (ORMOCERATIDAE) (FOSSIL)
- ORMOCERATIDAE Saeman, 1852 † - Family (CEPHALOPODA-NAUTILOIDEA [Subclass]-ACTINOCERIDA [Order]) (FOSSIL)
- ormophora, Asolene ormophora (P.M.A. Morelet, 1857) - (AMPULLARIIDAE)
- ormophorus, Clanculus ormophorus A. Adams, 1854 - (TROCHIDAE)
- orna, Nassarina orna W.P. Woodring, 1928 † - (COLUMBELLIDAE) (FOSSIL)
- ornamentalis, Murex brevispina ornamentalis W.F. Ponder & E.H. Vokes, 1988 - (MURICIDAE)
- Ornamentaria, syn of: Genus Monetaria F.H. Troschel, 1863 (CYPRAEIDAE)
- ornamentaria, Loxonema ornamentaria Netchaev, 1894 † - syn of: Stephanozyga ornamentaria (Netchaev, 1894 †) - (LOXONEMATIDAE) (FOSSIL)
- ornamentaria, Stephanozyga ornamentaria (Netchaev, 1894 †) - (PSEUDOZYGOPLEURIDAE) (FOSSIL)
- ornamentata, Orania ornamentata R. Houart, 1995 - (MURICIDAE)
- ornamentatus, Napaeus ornamentatus L. Moro, 2009 - (ENIDAE)
- ornata, Perdicella ornata (W. Newcomb, 1854) - (ACHATINELLIDAE)
- ornata, Actinodonta ornata Hicks, 1873 † - syn of: Actinodonta ramseyensis (Hicks, 1873 †) - (ACTINODONTIDAE) (FOSSIL)
- ornata, Davidia ornata Hicks, 1873 † - syn of: Actinodonta ramseyensis (Hicks, 1873 †) - (ACTINODONTIDAE) (FOSSIL)
- ornata, Amalda ornata (T. Ninomiya, 1988) - (ANCILLARIIDAE)
- ornata, Pododesmus ornata É.A.A. Locard, 1897 - (ANOMIIDAE)
- ornata, Anomia ornata W.M. Gabb, 1876 † - (ANOMIIDAE) (FOSSIL)
- ornata, Dolabrifera ornata W.J. Swainson, 1840 - syn of: Elysia ornata (W.J. Swainson, 1840) - (APLYSIIDAE)
- ornata, Architectonica ornata (Lea, 1833 †) - (ARCHITECTONICIDAE) (FOSSIL)
- ornata, Barbatia ornata G.P. Deshayes, 1858 † - (ARCIDAE) (FOSSIL)
- ornata, Filodrillia ornata C. Hedley, 1922 - (BORSONIIDAE)
- ornata, Asthenotoma ornata (J.L.M. Defrance, 1826 †) - (BORSONIIDAE) (FOSSIL)
- ornata, Siphonalia cassidariaeformis ornata A. Adams, 1863 - (BUCCINIDAE)
- ornata, Parastrophia ornata A. Vannozzi, M. Pizzini & B.K. Raines, 2015 - (CAECIDAE)
- ornata, Calliostoma ornata (J.B.P.A. Lamarck, 1822) - (CALLIOSTOMATIDAE)
- ornata, Trochita ornata B. de Basterot, 1825 † - (CALYPTRAEIDAE) (FOSSIL)
- ornata, Amphidromus adamsii ornata H.C. Fulton, 1896 - (CAMAENIDAE)
- ornata, Venericardia ornata (G.P. Deshayes †) - (CARDITIDAE) (FOSSIL)
- ornata, Cyclocardia ornata (G.P. Deshayes, 1858 †) - (CARDITIDAE) (FOSSIL)
- ornata, Ampezzoscala ornata (Münster, 1841 †) - (CERITHIOIDEA (UNASSIGNED)) (FOSSIL)
- ornata, Clathropsis ornata A. Cecalupo & I. Perugia, 2014 - (CERITHIOPSIDAE)
- ornata, Charpentieria ornata (E.A. Rossmässler, 1836) - (CLAUSILIIDAE)
- ornata, Montenegrina helvola ornata Z. Eröss & M. Szekeres, 1999 - (CLAUSILIIDAE)
- ornata, Clymenia ornata G.G. Münster, 1834 † - syn of: Ornatoclymenia ornata (G.G. Münster, 1834 †) - (CLYMENIIDAE) (FOSSIL)
- ornata, Colombellina ornata A.V.M.D. D'Orbigny, 1843 † - (COLOMBELLINIDAE) (FOSSIL)
- ornata, Zafra ornata (W.H. Pease, 1868) - (COLUMBELLIDAE)
- ornata, Columbella ornata E. Ravenel, 1859 - syn of: Parvanachis obesa (C.B. Adams, 1845) - (COLUMBELLIDAE)
- ornata, Archaeospira ornata Yü, 1979 † - syn of: Oelandiella korobkovi (Vostokova, 1962 †) - (COREOSPIRIDAE) (FOSSIL)
- ornata, Crassatina ornata (J.E. Gray in E. Griffith & E. Pidgeon, 1833) - (CRASSATELLIDAE)
- ornata, Cucullaea ornata Buckman, J † - (CUCULLAEIDAE) (FOSSIL)
- ornata, Cylindroteuthis ornata Dzyuba, 2013 † - (CYLINDROTEUTHIDIDAE) (FOSSIL)
- ornata, Canalispira ornata T. McCleery & A. Wakefield, 2007 - (CYSTISCIDAE)
- ornata, Streblopteria ornata (Etheridge †) - (DELTOPECTINIDAE) (FOSSIL)
- ornata, Atagema ornata (C.G. Ehrenberg, 1831) - (DISCODORIDIDAE)
- ornata, Trippa ornata L.S.R. Bergh, 1877 - syn of: Atagema ornata (C.G. Ehrenberg, 1831) - (DISCODORIDIDAE)
- ornata, Discohelix ornata J. Von Hauer, 1853 † - (DISCOHELICIDAE) (FOSSIL)
- ornata, Doris ornata D'Orbigny, 1837 - syn of: Polycera quadrilineata (O.F. Müller, 1776) - (DORIDIDAE)
- ornata, Doris ornata C.G. Ehrenberg, 1831 - syn of: Atagema ornata (C.G. Ehrenberg, 1831) - (DORIDIDAE)
- ornata, Doto ornata J. Alder & A. Hancock, 1842 - syn of: Doto coronata (J.F. Gmelin, 1791) - (DOTIDAE)
- ornata, Doto ornata P. Hesse - syn of: Doto pygmaea L.S.R. Bergh, 1871 - (DOTIDAE)
- ornata, Mytilopsis ornata (P.M.A. Morelet, 1885) - (DREISSENIDAE)
- ornata, Dreissena ornata P.M.A. Morelet, 1885 - syn of: Mytilopsis ornata (P.M.A. Morelet, 1885) - (DREISSENIDAE)
- ornata, Pythia ornata G. Perry, 1811 - syn of: Pythia scarabaeus (C. Linnaeus, 1758) - (ELLOBIIDAE)
- ornata, Ellobium ornata A.E.J. Férussac, 1821 - syn of: Ophicardelus ornatus (A.E.J. Férussac, 1821) - (ELLOBIIDAE)
- ornata, Eopteria ornata Billings, 1865 † - (EOPTERIIDAE) (FOSSIL)
- ornata, Scalaria ornata (Münster, 1841 †) - (EPITONIIDAE) (FOSSIL)
- ornata, Epitonium ornata H.B.S. Friele & J.A. Grieg, 1901 - syn of: Boreoscala greenlandica (G. Perry, 1811) - (EPITONIIDAE)
- ornata, Austraeolis ornata (G.F. Angas, 1864) - (FACELINIDAE)
- ornata, Latirogona ornata (P. Marshall, 1918 †) - (FASCIOLARIIDAE) (FOSSIL)
- ornata, Cuthona ornata K. Baba, 1937 - (FIONIDAE)
- ornata, Flabellina ornata J.J. Risbec, 1928 - syn of: Flabellina bicolor (E.F. Kelaart, 1858) - (FLABELLINIDAE)
- ornata, Flabellina ornata G.F. Angas, 1864 - syn of: Austraeolis ornata (G.F. Angas, 1864) - (FLABELLINIDAE)
- ornata, Helioclymenia ornata Pajchlowa, 1972 † - (GLATZIELLIDAE) (FOSSIL)
- ornata, Nodospira ornata E.L. Yochelson & Dutro, 1960 † - (GOSSELETINIDAE) (FOSSIL)
- ornata, Hypselentoma ornata Batten, 1989 † - (GOSSELETINIDAE) (FOSSIL)
- ornata, Helix ornata L. Parreyss, 1885 - syn of: Josephinella phocaea (J.R. Roth, 1855) - (HELICIDAE)
- ornata, Vivianella ornata (E.F.R.K. Koken, 1896 †) - (HELICOTOMIDAE) (FOSSIL)
- ornata, Viviana ornata E.F.R.K. Koken, 1896 † - syn of: Vivianella ornata (E.F.R.K. Koken, 1896 †) - (HELICOTOMIDAE) (FOSSIL)
- ornata, Hermaea ornata F.M. MacFarland, 1966 - syn of: Placida dendritica (J. Alder & A. Hancock, 1843) - (HERMAEIDAE)
- ornata, Hippocardia ornata Winchell & Marcy, 1866 † - (HIPPOCARDIIDAE) (FOSSIL)
- ornata, Hippocardia ornata Cleland, 1911 † - syn of: Conocardium plinthinatus R.M. Branson, 1942 † - (HIPPOCARDIIDAE) (FOSSIL)
- ornata, Sabinia ornata Özer & Fenerici, 1983 † - (HIPPURITIDA (UNASSIGNED)) (FOSSIL)
- ornata, Ohrigocea ornata (P. Radoman, 1957) - (HYDROBIIDAE)
- ornata, Cornuella ornata (K.E.I. von Eichwald, 1840 †) - (HYPSELOCONIDAE) (FOSSIL)
- ornata, Iravadia ornata H.F. Blanford, 1867 - (IRAVADIIDAE)
- ornata, Phaneroptyxis ornata Maire, 1927 † - (ITIERIIDAE) (FOSSIL)
- ornata, Liarea ornata A.W.B. Powell, 1954 - (LIAREIDAE)
- ornata, Limacina ornata O.G. Costa, 1861 - syn of: Capulus ungaricus (C. Linnaeus, 1758) - (LIMACINIDAE)
- ornata, Littorina ornata J.G. Jeffreys, 1865 - syn of: Littorina obtusata (C. Linnaeus, 1758) - (LITTORINIDAE)
- ornata, Divaricella ornata (A.E.R. Agassiz, 1845 †) - (LUCINIDAE) (FOSSIL)
- ornata, Divalinga ornata L.A. Reeve, 1850 - syn of: Divalinga quadrisulcata (A.V.M.D. D'Orbigny, 1846) - (LUCINIDAE)
- ornata, Zagrabica ornata Macale?, 2002 † - (LYMNAEIDAE) (FOSSIL)
- ornata, Macluritella ornata (Lochman, 1966 †) - (MACLURITIDAE) (FOSSIL)
- ornata, Mactra ornata J.E. Gray, 1837 - syn of: Mactra achatina ornata J.E. Gray, 1837 - (MACTRIDAE)
- ornata, Mactra achatina ornata J.E. Gray, 1837 - (MACTRIDAE)
- ornata, Carinata ornata Volobueva, 1981 † - (MALLETIIDAE) (FOSSIL)
- ornata, Spineilo ornata Kalishevich, 1973 † - (MALLETIIDAE) (FOSSIL)
- ornata, Neilo ornata (Sowerby, 1846 †) - (MALLETIIDAE) (FOSSIL)
- ornata, Bela ornata É.A.A. Locard, 1891 - syn of: Mangelia costulata A. Risso, 1826 - (MANGELIIDAE)
- ornata, Mangelia ornata G.B. III Sowerby, 1896 - syn of: Guraleus ornatus (G.B. III Sowerby, 1896) - (MANGELIIDAE)
- ornata, Cytharopsis ornata W.H. Pease, 1868 - syn of: Zafra ornata (W.H. Pease, 1868) - (MANGELIIDAE)
- ornata, Bela nebula ornata É.A.A. Locard, 1897 - (MANGELIIDAE)
- ornata, Marginella ornata J.H. Redfield, 1870 - (MARGINELLIDAE)
- ornata, Melanopsis ornata G.P. Deshayes, 1862 † - syn of: Eginea ornata (G.P. Deshayes, 1862 †) - (MELANOPSIDAE) (FOSSIL)
- ornata, Mesodesma ornata J.E. Gray in E. Griffith & E. Pidgeon, 1833 - syn of: Crassatina ornata (J.E. Gray in E. Griffith & E. Pidgeon, 1833) - (MESODESMATIDAE)
- ornata, Knightinella ornata A. Nützel & Ketwetsuriya, 2016 † - (MICRODOMATIDAE) (FOSSIL)
- ornata, Pterygia ornata G.H. Schubert & J.A. Wagner, 1829 - syn of: Pterygia nucea (J.F. Gmelin, 1791) - (MITRIDAE)
- ornata, Mitra ornata L.C. Kiener, 1838 - syn of: Mitra rossiae L.A. Reeve, 1844 - (MITRIDAE)
- ornata, Mitra ornata A. Adams, 1853 - syn of: Vexillum curviliratum (G.B. III Sowerby, 1874) - (MITRIDAE)
- ornata, Barrimysia ornata (K.H. Barnard, 1964) - (MONTACUTIDAE)
- ornata, Callomysia ornata (K.H. Barnard, 1964) - syn of: Barrimysia ornata (K.H. Barnard, 1964) - (MONTACUTIDAE)
- ornata, Cerithiozone ornata A. Nützel & Nakazawa, 2012 † - (MURCHISONIIDAE) (FOSSIL)
- ornata, Gervillia ornata Moore † - (MYALINIDAE) (FOSSIL)
- ornata, Tugonia ornata (B. de Basterot, 1825 †) - (MYIDAE) (FOSSIL)
- ornata, Myophoria ornata Münster, 1841 † - (MYOPHORIIDAE) (FOSSIL)
- ornata, Cellana ornata (L.W. Dillwyn, 1817) - (NACELLIDAE)
- ornata, Nassa ornata L.C. Kiener, 1834 - syn of: Nassarius stolatus (J.F. Gmelin, 1791) - (NASSARIIDAE)
- ornata, Nerita ornata E. Forbes, 1846 - (NERITIDAE)
- ornata, Nerita ornata L.W. Stephenson, 1953 † - (NERITIDAE) (FOSSIL)
- ornata, Nerita ornata G.B. I Sowerby, 1833 - syn of: Nerita scabricosta ornata (G.B. I Sowerby, 1833) - (NERITIDAE)
- ornata, Nerita scabricosta ornata (G.B. I Sowerby, 1833) - (NERITIDAE)
- ornata, Cassianopsis ornata (Münster, 1841 †) - (NERITOPSIDAE) (FOSSIL)
- ornata, Eumetula ornata (K.H.J. Thiele, 1912) - (NEWTONIELLIDAE)
- ornata, Arcopsis ornata J.M.R.M. Viader, 1951 - syn of: Ribriarca polycymoides ornata (J.M.R.M. Viader, 1951) - (NOETIIDAE)
- ornata, Ribriarca polycymoides ornata (J.M.R.M. Viader, 1951) - (NOETIIDAE)
- ornata, Nuculana ornata D'Orbigny, 1845 - (NUCULANIDAE)
- ornata, Menneroctenia ornata Kalishevich, 1973 † - syn of: Spineilo ornata Kalishevich, 1973 † - (NUCULIDA (unassigned)) (FOSSIL)
- ornata, Nucula ornata Sowerby, 1846 † - syn of: Neilo ornata (Sowerby, 1846 †) - (NUCULIDAE) (FOSSIL)
- ornata, Arctoplax ornata Cherns, 1998 † - (OCHMAZOCHITONIDAE) (FOSSIL)
- ornata, Oliva ornata F.P. Marrat, 1867 - (OLIVIDAE)
- ornata, Porphyria ornata P.F. Röding, 1798 - syn of: Oliva oliva (C. Linnaeus, 1758) - (OLIVIDAE)
- ornata, Omalogyra atomus ornata P. Dautzenberg, 1889 - (OMALOGYRIDAE)
- ornata, Acanthodoris ornata A.E. Verrill, 1879 - syn of: Acanthodoris pilosa (P.C. Abildgaard in O.F. Müller, 1789) - (ONCHIDORIDIDAE)
- ornata, Lytospira ornata Lochman, 1966 † - syn of: Macluritella ornata (Lochman, 1966 †) - (OPHILETIDAE) (FOSSIL)
- ornata, Limondinia ornata Valdés & P. Lozouet, 2000 † - (OPISTHOBRANCHIA (UNASSIGNED)) (FOSSIL)
- ornata, Ostrea ornata Devjatilova, 1981 † - (OSTREIDAE) (FOSSIL)
- ornata, Doryssa ornata (F. Poey, 1858) - (PACHYCHILIDAE)
- ornata, Eginea ornata (G.P. Deshayes, 1862 †) - (PACHYCHILIDAE) (FOSSIL)
- ornata, Patella ornata Moore † - (PATELLIDAE) (FOSSIL)
- ornata, Adacnarca ornata (M.A. Crozier, 1966) - (PHILOBRYIDAE)
- ornata, Lissarca ornata M.A. Crozier, 1966 - syn of: Adacnarca ornata (M.A. Crozier, 1966) - (PHILOBRYIDAE)
- ornata, Ornatoclymenia ornata (G.G. Münster, 1834 †) - (PIRICLYMENIIDAE) (FOSSIL)
- ornata, Elysia ornata (W.J. Swainson, 1840) - (PLAKOBRANCHIDAE)
- ornata, Fossarus ornata Münster, 1841 † - syn of: Cassianopsis ornata (Münster, 1841 †) - (PLANAXIDAE) (FOSSIL)
- ornata, Trochoclymenia ornata Petter, 1960 † - syn of: Endosiphonites muensteri Ansted, 1838 † - (PLATYCLYMENIIDAE) (FOSSIL)
- ornata, Berthella ornata (T.F. Cheeseman, 1878) - (PLEUROBRANCHIDAE)
- ornata, Anculosa ornata I. Lea, 1868 - (PLEUROCERIDAE)
- ornata, Pleurotomaria ornata (Sowerby, 1821 †) - (PLEUROTOMARIIDAE) (FOSSIL)
- ornata, Pleurotomaria ornata F.A. von Quenstedt, 1857 † - syn of: Obornella lentiformis (Eudes-Deslongchamps, 1849 †) - (PLEUROTOMARIIDAE) (FOSSIL)
- ornata, Limacia ornata (K. Baba, 1937) - (POLYCERIDAE)
- ornata, Kalinga ornata J. Alder & A. Hancock, 1864 - (POLYCERIDAE)
- ornata, Polycera ornata D'Orbigny, 1837 - syn of: Polycera quadrilineata (O.F. Müller, 1776) - (POLYCERIDAE)
- ornata, Chondrothyretes impressa ornata (C. de la Torre & P. Bartsch, 1938) - (POMATIIDAE)
- ornata, Cerithidea ornata A. Adams, 1863 - (POTAMIDIDAE)
- ornata, Ptychostoma ornata A. Nützel & Erwin, 2001 † - (PROSTYLIFERIDAE) (FOSSIL)
- ornata, Psammobia ornata G.P. Deshayes, 1855 - syn of: Gari maculosa J.B.P.A. Lamarck, 1818 - (PSAMMOBIIDAE)
- ornata, Pilsbryspira ornata D'Orbigny, 1847 - syn of: Pilsbryspira albocincta (C.B. Adams, 1845) - (PSEUDOMELATOMIDAE)
- ornata, Shedhornia ornata Kulas & Batten, 1997 † - (PSEUDOPHORIDAE) (FOSSIL)
- ornata, Plocezyga ornata (Mark, 1912 †) - (PSEUDOZYGOPLEURIDAE) (FOSSIL)
- ornata, Purpurina ornata Orbigny, 1853 † - syn of: Ambercyclus orbignyanus (Hudleston, 1893 †) - (PURPURINIDAE) (FOSSIL)
- ornata, Nodostoma ornata (Wood, 1848 †) - (PYRAMIDELLIDAE) (FOSSIL)
- ornata, Colsyrnola ornata (A.A. Gould, 1861) - (PYRAMIDELLIDAE)
- ornata, Turbonilla ornata (A.V.M.D. D'Orbigny, 1840) - (PYRAMIDELLIDAE)
- ornata, Pyramidella ornata A.A. Gould, 1861 - syn of: Colsyrnola ornata (A.A. Gould, 1861) - (PYRAMIDELLIDAE)
- ornata, Daphnella ornata R.B. Hinds, 1844 - (RAPHITOMIDAE)
- ornata, Raphitoma ornata É.A.A. Locard, 1892 - syn of: Bela nebula ornata É.A.A. Locard, 1897 - (RAPHITOMIDAE)
- ornata, Rissoella ornata L.R.L. Simone, 1995 - (RISSOELLIDAE)
- ornata, Lucidestea ornata (A.N. Golikov & O.V. Kussakin, 1967) - (RISSOIDAE)
- ornata, Rissoa ornata R.A. Philippi, 1847 - syn of: Rissoa splendida K.E.I. von Eichwald, 1830 - (RISSOIDAE)
- ornata, Runcina ornata (J.L.A. Quatrefages, 1844) - (RUNCINIDAE)
- ornata, Scissurella ornata W.L. May, 1908 - (SCISSURELLIDAE)
- ornata, Carenzia ornata B.A. Marshall, 1991 - (SEGUENZIIDAE)
- ornata, Semele ornata A.A. Gould, 1862 - syn of: Semele purpurascens (J.F. Gmelin, 1791) - (SEMELIDAE)
- ornata, Sepiella ornata (P.C.A.S.L. Rang, 1837) - (SEPIIDAE)
- ornata, Tenagodus ornata Lundgreen, 1885 † - (SILIQUARIIDAE) (FOSSIL)
- ornata, Lodderena ornata (A.A. Olsson & J.T.L. McGinty, 1958) - (SKENEIDAE)
- ornata, Lissospira ornata (A.E. Verrill, 1884) - (SKENEIDAE)
- ornata, Decorochilina ornata Tassell, 1982 † - syn of: Decorochilina australe (Tassell, 1982 †) - (SOLENISCIDAE) (FOSSIL)
- ornata, Stenothyra ornata T.N. Annandale & B. Prashad, 1921 - (STENOTHYRIDAE)
- ornata, Struthiolarella ornata (Sowerby, 1846 †) - (STRUTHIOLARIIDAE) (FOSSIL)
- ornata, Sinospira ornata Yin, 1932 † - (SUBULITIDAE) (FOSSIL)
- ornata, Terebra ornata J.E. Gray, 1834 - (TEREBRIDAE)
- ornata, Pyrgulifera ornata L.W. Stephenson, 1953 † - (THIARIDAE) (FOSSIL)
- ornata, Subclymenia ornata Shimanskiy, 1967 † - (TRIGONOCERATIDAE) (FOSSIL)
- ornata, Cosmotriphora ornata (G.P. Deshayes, 1832) - (TRIPHORIDAE)
- ornata, Conotalopia ornata (G.B. III Sowerby, 1903) - (TROCHIDAE)
- ornata, Gemmula ornata (P. Marshall, 1918 †) - (TURRIDAE) (FOSSIL)
- ornata, Turritella ornata Münster, 1841 † - syn of: Scalaria ornata (Münster, 1841 †) - (TURRITELLIDAE) (FOSSIL)
- ornata, Lampsilis ornata T.A. Conrad, 1835 - (UNIONIDAE)
- ornata, Septilumen ornata (J. Gundlach in L. Pfeiffer, 1859) - (UROCOPTIDAE)
- ornata, Lioconcha ornata (L.W. Dillwyn, 1817) - (VENERIDAE)
- ornata, Trigonocallista ornata M. Ichikawa & K. Maeda, 1963 † - syn of: Loxo japonica (K. Amano, 1957 †) - (VENERIDAE) (FOSSIL)
- ornata, Lemintina ornata Lea, 1833 † - syn of: Serpulorbis squamulosus T.A. Conrad, 1834 † - (VERMETIDAE) (FOSSIL)
- ornata, Trigonulina ornata (A.V.M.D. D'Orbigny, 1842) - (VERTICORDIIDAE)
- ornata, Kosovia ornata (P.S. Pavlovic, 1931 †) - (VIVIPARIDAE) (FOSSIL)
- ornata, Paludina ornata B. Phillips, 1871 † - (VIVIPARIDAE) (FOSSIL)
- ornata, Paludina ornata P.M.A. Morelet, 1851 - syn of: Pyrgophorus coronatus (L. Pfeiffer, 1840) - (VIVIPARIDAE)
- ornata, Vivipara ornata A. Fuchs, 1877 † - syn of: Holandriana fuchsi (W.A. Wenz, 1928 †) - (VIVIPARIDAE) (FOSSIL)
- ornata, Voluta ornata A.H. Verrill, 1950 - syn of: Voluta musica C. Linnaeus, 1758 - (VOLUTIDAE)
- ornata atticae, Asthenotoma ornata atticae (F. Nordsieck, 1977) - (BORSONIIDAE)
- ornata canarica, Asthenotoma ornata canarica (J.L.M. Defrance, 1826) - (BORSONIIDAE)
- ornata densestriata, Struthiolaria ornata densestriata H.F.A. von Ihering, 1897 † - syn of: Struthiolarella densestriata (H.F.A. von Ihering, 1897 †) - (STRUTHIOLARIIDAE) (FOSSIL)
- ornata depressa, Pleurotomaria ornata depressa W.H. Hudleston † - (PLEUROTOMARIIDAE) (FOSSIL)
- ornata marplatensis, Doris ornata marplatensis G.J. Franceschi, 1928 - syn of: Polycera quadrilineata (O.F. Müller, 1776) - (DORIDIDAE)
- ornata ortmanni, Neilo ornata ortmanni Erdmann & Morra, 1985 - (MALLETIIDAE)
- ornata prior, Clymenia ornata prior C.N. Lange, 1929 † - syn of: Ornatoclymenia ornata (G.G. Münster, 1834 †) - (CLYMENIIDAE) (FOSSIL)
- ornata prior, Cymaclymenia ornata prior C.N. Lange, 1929 † - syn of: Ornatoclymenia ornata (G.G. Münster, 1834 †) - (CYMACLYMENIIDAE) (FOSSIL)
- ornata serpentina, Marginella ornata serpentina F.P. Jousseaume, 1875 - syn of: Marginella lussii B. Hayes & V.G. Millard, 1995 - (MARGINELLIDAE)
- ornata simillima, Divaricella ornata simillima A.E.M. Cossmann & M.A. Peyrot, 1921 † - (LUCINIDAE) (FOSSIL)
- ornata simillinia, Divaricella ornata simillinia A.E.M. Cossmann & M.A. Peyrot, 1921 † - syn of: Divaricella ornata simillima A.E.M. Cossmann & M.A. Peyrot, 1921 † - (LUCINIDAE) (FOSSIL)
- ornata sudetica, Oxyclymenia ornata sudetica Renz, 1914 † - syn of: Cymaclymenia striata (G.G. Münster, 1832 †) - (CLYMENIIDAE) (FOSSIL)
- ornata vittata, Volvarina ornata vittata J.H. Redfield, 1870 - syn of: Volvarina vittata J.H. Redfield, 1870 - (MARGINELLIDAE)
- ornatella, Microcystis ornatella H.H. Beck, 1837 - (EUCONULIDAE)
- ornatellus, Hyolithes ornatellus Resser, 1939 † - (HYOLITHIDAE) (FOSSIL)
- ornati, Posidonia ornati F.A. von Quenstedt, 1851 † - syn of: Bositra buchi (F.A. Roemer, 1836 †) - (POSIDONIIDAE) (FOSSIL)
- Ornatimormus, Subgenus Drymaeus (Ornatimormus) W.K. Weyrauch, 1958 (BULIMULIDAE)
- ornatinoda, Bohaispira ornatinoda Y.F. Huang, 1983 † - (BOHAISPIRIDAE) (FOSSIL)
- ornatissima, Architectonica ornatissima Seeley, 1864 † - (ARCHITECTONICIDAE) (FOSSIL)
- ornatissima, Khasiella ornatissima W.H. Benson - (ARIOPHANTIDAE)
- ornatissima, Bucania ornatissima L. Waagen, 1880 † - syn of: Retispira ornatissima (L. Waagen, 1880 †) - (BUCANIIDAE) (FOSSIL)
- ornatissima, Cadlinella ornatissima (J.J. Risbec, 1928) - (CHROMODORIDIDAE)
- ornatissima, Kaliella ornatissima A.R.J.B. Bavay & P. Dautzenberg, 1912 - (CHRONIDAE)
- ornatissima, Cardiomya ornatissima (A.V.M.D. D'Orbigny, 1853) - (CUSPIDARIIDAE)
- ornatissima, Cuspidaria ornatissima W.H. Dall, 1881 - (CUSPIDARIIDAE)
- ornatissima, Zittelihalobia ornatissima (Smith, 1927 †) - (HALOBIIDAE) (FOSSIL)
- ornatissima, Retispira ornatissima (L. Waagen, 1880 †) - (KNIGHTITIDAE) (FOSSIL)
- ornatissima, Divaricella ornatissima (A.V.M.D. D'Orbigny, 1846) - (LUCINIDAE)
- ornatissima, Modiomorpha ornatissima Johnston, 1887 † - syn of: Volsellina ornatissima (Johnston, 1887 †) - (MODIOMORPHIDAE) (FOSSIL)
- ornatissima, Sphenia ornatissima D'Orbigny in R. de la Sagra, 1853 - syn of: Cardiomya ornatissima (A.V.M.D. D'Orbigny, 1853) - (MYIDAE)
- ornatissima, Volsellina ornatissima (Johnston, 1887 †) - (MYTILIDAE) (FOSSIL)
- ornatissima, Yokoyamaia ornatissima (M. Yokoyama, 1927) - (PHILINIDAE)
- ornatissima, Philine ornatissima M. Yokoyama, 1927 - syn of: Yokoyamaia ornatissima (M. Yokoyama, 1927) - (PHILINIDAE)
- ornatissima, Plocezyga ornatissima Hoare & Sturgeon, 1980 † - (PSEUDOZYGOPLEURIDAE) (FOSSIL)
- ornatissima, Purpurina ornatissima Moore † - (PURPURINIDAE) (FOSSIL)
- ornatissima, Odostomia ornatissima (F. Haas, 1943) - (PYRAMIDELLIDAE)
- ornatissima, Solariella ornatissima (M.M. Schepman, 1908) - (SOLARIELLIDAE)
- ornatissima, Linearis ornatissima Weller, 1907 † - (TELLINIDAE) (FOSSIL)
- ornatissima, Chionopsis ornatissima (W.J. Broderip, 1835) - (VENERIDAE)
- ornatissima, Venus ornatissima W.J. Broderip, 1835 - syn of: Chionopsis ornatissima (W.J. Broderip, 1835) - (VENERIDAE)
- ornatissima perrostrata, Cardiomya ornatissima perrostrata W.H. Dall, 1881 - syn of: Cardiomya perrostrata (W.H. Dall, 1881) - (CUSPIDARIIDAE)
- ornatissimum, Yubariceras ornatissimum (F. Stoliczka, 1864 †) - (ACANTHOCERATIDAE) (FOSSIL)
- ornatissimum, Bittium ornatissimum P. Bartsch, 1911 - (CERITHIIDAE)
- ornatissimum, Eumorphoceras ornatissimum Miller & Youngquist, 1948 † - (GIRTYOCERATIDAE) (FOSSIL)
- ornatissimum, Pojetorum ornatissimum (Barrande, 1881 †) - (HIPPOCARDIIDAE) (FOSSIL)
- ornatissimum, Foordiceras ornatissimum Miller & Youngquist, 1949 † - (KONINCKIOCERATIDAE) (FOSSIL)
- ornatissimum, Irinoceras ornatissimum (Koninck, 1882 †) - (PRIONOCERATIDAE) (FOSSIL)
- ornatissimum, Bellastraea ornatissimum (Tenison Woods, 1877 †) - (TURBINIDAE) (FOSSIL)
- ornatissimus, Conus ornatissimus Martin, 1883 † - (CONIDAE) (FOSSIL)
- ornatissimus, Iberus alonensis ornatissimus C. Cobos, 1979 - (HELICIDAE)
- ornatissimus, Brachidontes ornatissimus A.V.M.D. A.V.M.D. D'Orbigny, 1844 † - (MYTILIDAE) (FOSSIL)
- ornatissimus, Lithodomus ornatissimus Mayer-Eymar, 1887 - syn of: Lithophaga corrugata (R.A. Philippi, 1846) - (MYTILIDAE)
- ornatissimus, Spondylus ornatissimus Böhm, 1927 † - (SPONDYLIDAE) (FOSSIL)
- Ornatoclymenia, Genus Ornatoclymenia Bogoslovsky, 1979 † (PIRICLYMENIIDAE) (FOSSIL)
- Ornatoconcha, Genus Ornatoconcha V.J. Lus, 1987 (BUCCINIDAE)
- ornatocostatum, Keenocardium ornatocostatum (Volobueva, 1981 †) - (CARDIIDAE) (FOSSIL)
- ornatoparvum, Stellaxis ornatoparvum F. Sacco, 1896 † - (ARCHITECTONICIDAE) (FOSSIL)
- Ornatoptygmatis, Genus Ornatoptygmatis Lyssenko, 1990 † (NEOGASTROPODA (UNASSIGNED)) (FOSSIL)
- Ornatosinuitina, Genus Ornatosinuitina Blodgett & Frýda, 1999 † (BUCANELLIDAE) (FOSSIL)
- Ornatospira, Genus Ornatospira Pan, 1982 † (PLEUROTOMARIIDAE) (FOSSIL)
- ornatula, Cerion ornatula C.J. Maynard, 1913 - (CERIONIDAE)
- ornatula, Poleumita ornatula J. Perner, 1903 † - syn of: Oriostoma ornatula (J. Perner, 1903 †) - (EUOMPHALIDAE) (FOSSIL)
- ornatula, Oriostoma ornatula (J. Perner, 1903 †) - (ORIOSTOMATIDAE) (FOSSIL)
- ornatulaclappi, Cerion ornatulaclappi (C.J. Maynard, 1913) - (CERIONIDAE)
- ornatularufina, Strophiops ornatularufina C.J. Maynard, 1913 - (CERIONIDAE)
- ornatum, Metoicoceras ornatum Moreman, 1942 † - syn of: Metoicoceras gibbosum A. Hyatt, 1903 † - (ACANTHOCERATIDAE) (FOSSIL)
- ornatum, Pseudagathiceras ornatum Ehiro & Araki, 1997 † - (ADRIANITIDAE) (FOSSIL)
- ornatum, Mortoniceras ornatum van Hoepen, 1944 † - (BRANCOCERATIDAE) (FOSSIL)
- ornatum, Buccinum ornatum L.C. Kiener, 1834 - syn of: Nassarius stolatus (J.F. Gmelin, 1791) - (BUCCINIDAE)
- ornatum, Cardium ornatum K.E.I. von Eichwald, 1855 - syn of: Cerastoderma glaucum (J.G. Bruguière, 1789) - (CARDIIDAE)
- ornatum, Cerastoderma ornatum K.E.I. von Eichwald, 1855 - syn of: Cerastoderma glaucum (J.G. Bruguière, 1789) - (CARDIIDAE)
- ornatum, Cardium ornatum G.B. III Sowerby, 1877 - syn of: Vasticardium fultoni (G.B. III Sowerby, 1916) - (CARDIIDAE)
- ornatum, Cenoceras ornatum Foord & Crick, 1890 † - (CENOCERATIDAE) (FOSSIL)
- ornatum, Cerion torrei ornatum H.A. Pilsbry & E.G. Vanatta, 1899 - (CERIONIDAE)
- ornatum, Ceratosoma ornatum L.S.R. Bergh, 1890 - syn of: Ceratosoma tenue F.D. Abraham, 1876 - (CHROMODORIDIDAE)
- ornatum, Obscurella ornatum A. Moquin-Tandon, 1855 - syn of: Cochlostoma obscurum (J.P.R. Draparnaud, 1801) - (COCHLOSTOMATIDAE)
- ornatum, Conocardium ornatum Cleland, 1911 † - syn of: Conocardium plinthinatus R.M. Branson, 1942 † - (CONOCARDIIDAE) (FOSSIL)
- ornatum, Vexillum ornatum J.H.F. Link, 1807 - syn of: Vexillum taeniatum (J.B.P.A. Lamarck, 1811) - (COSTELLARIIDAE)
- ornatum, Diastoma ornatum J.H.F. Douvillé, 1916 † - (DIASTOMATIDAE) (FOSSIL)
- ornatum, Protacrioceras ornatum (A.V.M.D. D'Orbigny, 1850 †) - (EMERICICERATIDAE) (FOSSIL)
- ornatum, Crucilobiceras ornatum Trueman & Williams † - (EODEROCERATIDAE) (FOSSIL)
- ornatum, Sagaminopteron ornatum T. Tokioka & K. Baba, 1964 - (GASTROPTERIDAE)
- ornatum, Platyteichum ornatum C.O. Waterhouse, 1983 † - (GOSSELETINIDAE) (FOSSIL)
- ornatum, Protornoceras ornatum Dybczynski, 1913 † - (KIRSOCERATIDAE) (FOSSIL)
- ornatum, Kosmoceras ornatum Schlotheim, 1820 † - (KOSMOCERATIDAE) (FOSSIL)
- ornatum, Brochidium ornatum E.F.R.K. Koken, 1889 † - syn of: Brochidium aries (Laube, 1869 †) - (LIOTIIDAE) (FOSSIL)
- ornatum, Cyclostrema ornatum A.E. Verrill, 1884 - syn of: Lissospira ornata (A.E. Verrill, 1884) - (LIOTIIDAE)
- ornatum, Lunulacardium ornatum J.W. Hall, 1843 † - (LUNULACARDIIDAE) (FOSSIL)
- ornatum, Paratrematoceras ornatum Schastlivtseva, 1981 † - (MICHELINOCERATIDAE) (FOSSIL)
- ornatum, Penicillus ornatum J.C. Chenu, 1842 - syn of: Verpa philippinensis (J.C. Chenu, 1843) - (PENICILLIDAE)
- ornatum, Dioscopoma ornatum (H.H. Godwin-Austen, 1881) - (POMATIIDAE)
- ornatum, Discamphiceras ornatum Taylor, 1998 † - (PSILOCERATIDAE) (FOSSIL)
- ornatum, Aylacostoma ornatum Unknown Author - (THIARIDAE)
- ornatum, Atoxon ornatum C. Pollonera, 1906 - (UROCYCLIDAE)
- ornatum, Westonoceras ornatum (Troedsson, 1926 †) - (WESTONOCERATIDAE) (FOSSIL)
- ornatum, Thuleoceras ornatum Troedsson, 1926 † - syn of: Westonoceras ornatum (Troedsson, 1926 †) - (WESTONOCERATIDAE) (FOSSIL)
- ornatum alpinum, Protacrioceras ornatum alpinum Sarkar, 1955 † - (EMERICICERATIDAE) (FOSSIL)
- ornatum flexuosum, Protacrioceras ornatum flexuosum Sarkar, 1955 † - (EMERICICERATIDAE) (FOSSIL)
- ornatum latispirum, Protacrioceras ornatum latispirum (Thomel, 1965 †) - (EMERICICERATIDAE) (FOSSIL)
- ornatum similis, Calliostoma ornatum similis W.H. Turton, 1932 - syn of: Calliostoma ornata (J.B.P.A. Lamarck, 1822) - (CALLIOSTOMATIDAE)
- ornatum tuherculatum, Protacrioceras ornatum tuherculatum Sarkar, 1955 † - (EMERICICERATIDAE) (FOSSIL)
- ornatus, Amphithalamus ornatus (A.W.B. Powell, 1927) - (ANABATHRIDAE)
- ornatus, Ancyloceras ornatus A.V.M.D. D'Orbigny, 1850 † - syn of: Protacrioceras ornatum (A.V.M.D. D'Orbigny, 1850 †) - (ANCYLOCERATIDAE) (FOSSIL)
- ornatus, Helicaulax ornatus (A.V.M.D. D'Orbigny, 1843 †) - (APORRHAIDAE) (FOSSIL)
- ornatus, Chenopus ornatus Buvignier, 1852 † - (APORRHAIDAE) (FOSSIL)
- ornatus, Dermatobranchus ornatus (L.S.R. Bergh, 1874) - (ARMINIDAE)
- ornatus, Aviculopecten ornatus Hall 1883 † - (AVICULOPECTINIDAE) (FOSSIL)
- ornatus, Coelocyclus ornatus Northrop, 1939 † - (BELLEROPHONTIDAE) (FOSSIL)
- ornatus, Bucanopsis ornatus Weller, 1920 † - syn of: Retispira ornatus (Weller, 1920 †) - (BELLEROPHONTIDAE) (FOSSIL)
- ornatus, Manuaniceras ornatus Besairie, 1936 † - (BRANCOCERATIDAE) (FOSSIL)
- ornatus, Polybranchia ornatus K. Baba, 1937 - (CALIPHYLLIDAE)
- ornatus, Pachnodus ornatus (H. Dufo, 1840) - (CERASTUIDAE)
- ornatus, Columbites ornatus Smith, 1932 † - syn of: Columbites parisianus A. Hyatt & Smith, 1905 † - (COLUMBITIDAE) (FOSSIL)
- ornatus, Conus ornatus C.J. Maury, 1917 † - (CONIDAE) (FOSSIL)
- ornatus, Conus ornatus Michelotti, 1847 † - (CONIDAE) (FOSSIL)
- ornatus, Conus ornatus Hutton, 1873 † - (CONIDAE) (FOSSIL)
- ornatus, Conus ornatus G.B. I Sowerby, 1833 - syn of: Purpuriconus magellanicus (C.H. Hwass in J.G. Bruguière, 1792) - (CONIDAE)
- ornatus, Conus ornatus P.F. Röding, 1798 - syn of: Strategoconus monile (C.H. Hwass in J.G. Bruguière, 1792) - (CONIDAE)
- ornatus, Crestjahitus ornatus Syssoiev, 1968 † - (CRESTJAHITIDAE) (FOSSIL)
- ornatus, Cyrtolites ornatus T.A. Conrad, 1838 † - (CYRTOLITIDAE) (FOSSIL)
- ornatus, Gonyodiscus ornatus Mathews, 1929 † - syn of: Hemiprionites typus (L. Waagen, 1895 †) - (DISCIDAE) (FOSSIL)
- ornatus, Ophicardelus ornatus (A.E.J. Férussac, 1821) - (ELLOBIIDAE)
- ornatus, Ambercyclus ornatus (Sowerby, 1819 †) - (EUCYCLIDAE) (FOSSIL)
- ornatus, Latirus ornatus W.G. Lyons & Snyder, 2015 - (FASCIOLARIIDAE)
- ornatus, Pectunculus ornatus J.M.R.M. Viader, 1951 - syn of: Ribriarca polycymoides ornata (J.M.R.M. Viader, 1951) - (GLYCYMERIDIDAE)
- ornatus, Goniatites ornatus Klipstein, 1843 † - syn of: Trachyceras muensteri (Wissmann, 1841 †) - (GONIATITIDAE) (FOSSIL)
- ornatus, Lepthoplites ornatus Spath, 1926 † - (HOPLITIDAE) (FOSSIL)
- ornatus, Blodgettinotus ornatus Frýda, 1999 † - (KNIGHTITIDAE) (FOSSIL)
- ornatus, Retispira ornatus (Weller, 1920 †) - (KNIGHTITIDAE) (FOSSIL)
- ornatus, Valhalites ornatus (Girty, 1911 †) - (KONINCKIOCERATIDAE) (FOSSIL)
- ornatus, Endolobus ornatus Girty, 1911 † - syn of: Valhalites ornatus (Girty, 1911 †) - (KONINCKIOCERATIDAE) (FOSSIL)
- ornatus, Stiliger ornatus (C.G. Ehrenberg, 1828) - (LIMAPONTIIDAE)
- ornatus, Lithoglyphus ornatus Papaianopol, 2006 † - (LITHOGLYPHIDAE) (FOSSIL)
- ornatus, Guraleus ornatus (G.B. III Sowerby, 1896) - (MANGELIIDAE)
- ornatus, Margarites ornatus (J.E. De Kay, 1843) - (MARGARITIDAE)
- ornatus, Trophon ornatus H. Strebel, 1904 - syn of: Xymenopsis corrugata (L.A. Reeve, 1848) - (MURICIDAE)
- ornatus, Modiolus ornatus W.M. Gabb, 1864 † - (MYTILIDAE) (FOSSIL)
- ornatus, Nassarius ornatus L.C. Kiener, 1834 - syn of: Nassarius stolatus (J.F. Gmelin, 1791) - (NASSARIIDAE)
- ornatus, Nautilus ornatus Foord & Crick, 1890 † - syn of: Cenoceras ornatum Foord & Crick, 1890 † - (NAUTILIDAE) (FOSSIL)
- ornatus, Callistoctopus ornatus (A.A. Gould, 1852) - (OCTOPODIDAE)
- ornatus, Octopus ornatus A.A. Gould, 1852 - syn of: Callistoctopus ornatus (A.A. Gould, 1852) - (OCTOPODIDAE)
- ornatus, Liguus fasciatus ornatus C.T. Simpson, 1920 - (ORTHALICIDAE)
- ornatus, Oxychilus ornatus F. Riedel, 1964 - (OXYCHILIDAE)
- ornatus, Paludomus ornatus W.H. Benson, 1856 - (PALUDOMIDAE)
- ornatus, Paraceltites ornatus Miller & Furnish, 1940 † - (PARACELTITIDAE) (FOSSIL)
- ornatus, Isculites ornatus McLearn, 1947 † - syn of: Episculites browni (McLearn, 1939 †) - (PARAGOCERATIDAE) (FOSSIL)
- ornatus, Caribachlamys ornatus (J.B.P.A. Lamarck, 1819) - (PECTINIDAE)
- ornatus, Prodromites ornatus Smith, 1903 † - (PRODROMITIDAE) (FOSSIL)
- ornatus, Raphitoma ornatus H. Strebel, 1904 - syn of: Tritonoturris capensis (E.A. Smith, 1882) - (RAPHITOMIDAE)
- ornatus, Dientomochilus ornatus (G.P. Deshayes, 1835 †) - (RIMELLIDAE) (FOSSIL)
- ornatus, Cyrtospira ornatus E.F.R.K. Koken & J. Perner, 1925 † - (SUBULITIDAE) (FOSSIL)
- ornatus, Phaedrysmocheilus ornatus E.S. Sobolev, 1989 † - (TAINOCERATIDAE) (FOSSIL)
- ornatus, Tentaculites ornatus J. de C. Sowerby, 1839 † - (TENTACULITIDAE) (FOSSIL)
- ornatus, Cyclostremiscus ornatus A.A. Olsson & J.T.L. McGinty, 1958 - syn of: Lodderena ornata (A.A. Olsson & J.T.L. McGinty, 1958) - (TORNIDAE)
- ornatus, Trochus ornatus Klipstein, 1843 † - (TROCHIDAE) (FOSSIL)
- ornatus, Trochus ornatus J.B.P.A. Lamarck, 1822 - syn of: Calliostoma ornata (J.B.P.A. Lamarck, 1822) - (TROCHIDAE)
- ornatus, Unio ornatus I. Lea, 1861 - syn of: Fusconaia barnesiana (I. Lea, 1829) - (UNIONIDAE)
- ornatus, Pitar ornatus Devjatilova, 1981 † - (VENERIDAE) (FOSSIL)
- ornatus, Viviparus ornatus M. von Neumayr in M. von Neumayr & C.R.C. Paul, 1875 † - (VIVIPARIDAE) (FOSSIL)
- ornatus abbas, Ambercyclus ornatus abbas Hudleston † - (EUCYCLIDAE) (FOSSIL)
- ornatus horrida, Ambercyclus ornatus horrida Hudleston † - (EUCYCLIDAE) (FOSSIL)
- ornatwn, Cerion torrei ornatwn H.A. Pilsbry & E.G. Vanatta, 1898 - (CERIONIDAE)
- Ornithopecten, Genus Ornithopecten Cox, 1962 (ORNITHOPECTINIDAE) (FOSSIL)
- ORNITHOPECTINIDAE Hautmann, 2011 † - Family (BIVALVIA-PTERIOMORPHIA [Subclass]-PECTINIDA [Order]-HETEROPECTINOIDEA [Superfamily]) (FOSSIL)
- ornithoptera, Glycymeris ornithoptera (A.C. Chapman & F.A. Singleton, 1925 †) - (GLYCYMERIDIDAE) (FOSSIL)
- ornithorica, Diplommatina ornithorica W.S.S. Van Benthem-Jutting - (DIPLOMMATINIDAE)
- Ornithoteuthis, Genus Ornithoteuthis Y.K. Okada, 1927 (OMMASTREPHIDAE)
- Ornollus, Genus Ornollus Heidelberger, 2001 † (EUOMPHALINA (UNASSIGNED)) (FOSSIL)
- Ornopsis, Genus Ornopsis Wade, 1916 † (FASCIOLARIIDAE) (FOSSIL)
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