- unia, Albinaria brevicollis unia (O. Böttger, 1883) - (CLAUSILIIDAE)
- Uniandra, Subgenus Ensidens (Uniandra) Haas, 1913 (UNIONIDAE)
- uniangulare, Tornoceras uniangulare (T.A. Conrad, 1842 †) - (TORNOCERATIDAE) (FOSSIL)
- uniangulare compressum, Tornoceras uniangulare compressum A.H. Clarke, 1899 † - syn of: Tornoceras compressum (A.H. Clarke, 1899 †) - (TORNOCERATIDAE) (FOSSIL)
- uniangulare obesum, Tornoceras uniangulare obesum A.H. Clarke, 1899 † - syn of: Tornoceras obesum (A.H. Clarke, 1899 †) - (TORNOCERATIDAE) (FOSSIL)
- uniangulare widderi, Tornoceras uniangulare widderi House, 1965 † - syn of: Tornoceras widderi House, 1965 † - (TORNOCERATIDAE) (FOSSIL)
- uniangularis, Goniatites uniangularis T.A. Conrad, 1842 † - syn of: Tornoceras uniangulare (T.A. Conrad, 1842 †) - (GONIATITIDAE) (FOSSIL)
- uniangularis, Turritella uniangularis J.B.P.A. Lamarck, 1804 † - (TURRITELLIDAE) (FOSSIL)
- uniangulata, Cancellaria uniangulata G.P. Deshayes, 1830 - (CANCELLARIIDAE)
- uniangulata, Helicotoma uniangulata J.W. Hall, 1847 † - syn of: Macluritella uniangulata (J.W. Hall, 1847 †) - (HELICOTOMIDAE) (FOSSIL)
- uniangulata, Macluritella uniangulata (J.W. Hall, 1847 †) - (MACLURITIDAE) (FOSSIL)
- uniarmata, Ambigua signata uniarmata (M. Paulucci, 1881) - (HELICIDAE)
- uniarmata, Truncatellina uniarmata (H.C. Küster, 1856) - (VERTIGINIDAE)
- unibalteata, Natica unibalteata J.Y. Liu, 1977 - (NATICIDAE)
- unica, Leptoplax unica (H.F. Nierstrasz, 1905) - (ACANTHOCHITONIDAE)
- unica, Aclis unica G. Montagu, 1803 - syn of: Graphis albida (F. Kanmacher, 1798) - (ACLIDIDAE)
- unica, Antirotella unica Heidelberger, 2001 † - (ANOMPHALIDAE) (FOSSIL)
- unica, Cardita unica B.F. Kensley & Pether, 1986 † - (CARDITIDAE) (FOSSIL)
- unica, Zagrabica unica Macale?, 2002 † - (LYMNAEIDAE) (FOSSIL)
- unica, Palaeolucina unica Reed, 1932 † - (MACTROMYIDAE) (FOSSIL)
- unica, Hydroginella unica F. Boyer, A. Wakefield & T. McCleery, 2003 - (MARGINELLIDAE)
- unica, Callianax unica W.P. Woodring, 1928 † - (OLIVELLIDAE) (FOSSIL)
- unica, Dissona unica Kulikova 1968 † - (OVULIDAE) (FOSSIL)
- unica, Strophostylus unica J.W. Hall, 1862 † - (PLATYCERATIDAE) (FOSSIL)
- Unica, Genus Unica Gorbach, 1985 † (PTERIIDA (UNASSIGNED)) (FOSSIL)
- unica, Chemnitzia unica (G. Montagu, 1803) - (PYRAMIDELLIDAE)
- unica, Odostomia unica J. Makiyama, 1927 - (PYRAMIDELLIDAE)
- unica, Thesbia unica A.V. Sysoev, 1988 - (RAPHITOMIDAE)
- unicamera, Hebetorthoceras unicamera (Smith, 1938 †) - (PSEUDORTHOCERATIDAE) (FOSSIL)
- unicanaliculatus, Belemnites unicanaliculatus J.D.W. Hartmann in Zieten, 1830 † - (BELEMNITELLIDAE) (FOSSIL)
- UNICARDIOPSIDAE Chavan, 1969 † - Family (BIVALVIA-HETERODONTA [Subclass]-EUHETERODONTA [Infraclass]-IMPARIDENTIA [Superorder]-VENERIDA [Order]-TELLINOIDEA [Superfamily]) (FOSSIL)
- Unicardiopsis, Genus Unicardiopsis Chavan, 1969 † (UNICARDIOPSIDAE) (FOSSIL)
- Unicardium, Genus Unicardium D'Orbigny, 1850 † (MACTROMYIDAE) (FOSSIL)
- unicarina, Buvignieria unicarina (Buvignier, 1843 †) - (RISSOINIDAE) (FOSSIL)
- unicarina, Elachorbis unicarina C.R. Laws, 1940 † - (TORNIDAE) (FOSSIL)
- unicarinalis, Fossarus unicarinalis (J.E. Tenison-Woods, 1876) - (PLANAXIDAE)
- unicarinata, Alaria unicarinata Hudleston, 1884 † - (APORRHAIDAE) (FOSSIL)
- unicarinata, Tromina unicarinata R.A. Philippi, 1868 - syn of: Tromina dispectata R.K. Dell, 1990 - (BUCCINIDAE)
- Unicarinata, Genus Unicarinata Pan, 1982 † (CAENOGASTROPODA (UNASSIGNED)) (FOSSIL)
- unicarinata, Iphinoe unicarinata (W.J. Broderip & G.B. I Sowerby, 1829) - (CAPULIDAE)
- unicarinata, Trichotropis unicarinata W.J. Broderip & G.B. I Sowerby, 1829 - syn of: Iphinoe unicarinata (W.J. Broderip & G.B. I Sowerby, 1829) - (CAPULIDAE)
- unicarinata, Gymnentome unicarinata D.T. Dockery, 1993 † - (CASSIOPIDAE) (FOSSIL)
- unicarinata, Promathildia unicarinata F.A. von Quenstedt, 1856 † - syn of: Clathrobaculus humberti (F.A. von Quenstedt, 1856 †) - (GORDENELLIDAE) (FOSSIL)
- unicarinata, Pyrgula unicarinata Š. Brusina, 1902 † - (HYDROBIIDAE) (FOSSIL)
- unicarinata, Brasovia producta unicarinata (E. Jekelius, 1944 †) - (HYDROBIIDAE) (FOSSIL)
- unicarinata, Acanthina unicarinata G.B. Sowerby, 1835 - syn of: Acanthinucella spirata (H.M.D. de Blainville, 1832) - (MURICIDAE)
- unicarinata, Tianzhushanospira unicarinata Yü, 1979 † - (PELAGIELLIDAE) (FOSSIL)
- unicarinata, Tropidophora tricarinata unicarinata (J.B.P.A. Lamarck, 1822) - (POMATIIDAE)
- unicarinata, Protorcula unicarinata E.A.L. Kittl, 1899 † - (PROTORCULIDAE) (FOSSIL)
- unicarinata, Powellisetia unicarinata (A.W.B. Powell, 1930) - (RISSOIDAE)
- unicarinata, Scenella unicarinata T. Kobayashi, 1934 † - (SCENELLIDAE) (FOSSIL)
- unicarinata, Notosetia unicarinata A.W.B. Powell, 1930 - syn of: Powellisetia unicarinata (A.W.B. Powell, 1930) - (SKENEIDAE)
- unicarinata, Fusoterebra terebrina unicarinata F. Sacco † - (TEREBRIDAE) (FOSSIL)
- unicarinata, Latitrigonia unicarinata Kobayashi & Tamura, 1957 † - (TRIGONIIDAE) (FOSSIL)
- unicarinata, Nototriphora unicarinata B.A. Marshall, 1983 - (TRIPHORIDAE)
- unicarinata, Pseudostomatella unicarinata J.T. Kuroda - (TROCHIDAE)
- unicarinata, Coluzea unicarinata (G.P. Deshayes, 1835 †) - (TURBINELLIDAE) (FOSSIL)
- unicarinata, Turritella unicarinata Woodward, 1833 † - (TURRITELLIDAE) (FOSSIL)
- unicarinata, Valvata unicarinata Lörenthey, 1893 † - (VALVATIDAE) (FOSSIL)
- unicarinata lata, Iphinoe unicarinata lata T. Habe, 1961 - (CAPULIDAE)
- unicarinatum, Cerithium unicarinatum A. Adams, 1854 - syn of: Cerithidea charbonnieri (S.A.A. Petit De La Saussaye, 1851) - (CERITHIIDAE)
- unicarinatus, Ambercyclus bisertus unicarinatus (Hudleston ex W.I. Bean MS †) - (EUCYCLIDAE) (FOSSIL)
- unicarinatus, Fusinus unicarinatus G.P. Deshayes, 1835 † - (FASCIOLARIIDAE) (FOSSIL)
- unicarinatus, Fusus unicarinatus R.A. Philippi, 1868 - syn of: Tromina dispectata R.K. Dell, 1990 - (FASCIOLARIIDAE)
- unicarinatus, Trophon unicarinatus G.W. Tryon, 1880 - syn of: Tromina dispectata R.K. Dell, 1990 - (MURICIDAE)
- unicarinatus, Terefundus quadricinctus unicarinatus R.K. Dell, 1956 - (MURICIDAE)
- unicarinatus, Dimorphotectus unicarinatus J. Szabo, 1981 † - (TROCHIDAE) (FOSSIL)
- unicarinatus, Macroceramus unicarinatus (J.B.P.A. Lamarck, 1822) - (UROCOPTIDAE)
- unicarinifera, Valvata unicarinifera Hislop, 1859 † - (VALVATIDAE) (FOSSIL)
- unicincta, Eulima unicincta M. Yokoyama, 1922 - (EULIMIDAE)
- unicincta, Muellerpalia haszprunari unicincta (Lörenthey, 1906 †) - (HYDROBIIDAE) (FOSSIL)
- unicincta, Melanopsis unicincta Blanckenhorn, 1897 † - (MELANOPSIDAE) (FOSSIL)
- unicincta, Nassa unicincta T. Say, 1826 - syn of: Engoniophos unicinctus (T. Say, 1826) - (NASSARIIDAE)
- unicincta, Besla unicincta E. Robba, 2013 † - (PYRAMIDELLIDAE) (FOSSIL)
- unicincta, Turbonilla unicincta J.C. Melvill, 1910 - (PYRAMIDELLIDAE)
- unicincta, Ericusa fulgetrum unicincta J.C. Verco, 1912 - (VOLUTIDAE)
- unicinctus, Engoniophos unicinctus (T. Say, 1826) - (NASSARIIDAE)
- unicinctus, Phos unicinctus T. Say, 1826 - syn of: Engoniophos unicinctus (T. Say, 1826) - (NASSARIIDAE)
- unicinctus, Plesiotrochus unicinctus (C.B. Adams, 1853) - (PLESIOTROCHIDAE)
- unicingulata, Austrocarina unicingulata N.H. Ludbrook, 1978 † - (HORAICLAVIDAE) (FOSSIL)
- unicirrhus, Scaeurgus unicirrhus (S. Delle Chiaje, 1841) - (OCTOPODIDAE)
- unicolor, Ampelita unicolor L. Pfeiffer, 1846 - (ACAVIDAE)
- unicolor, Leptocala sylvatica unicolor (C.B. Adams, 1849) - (ACHATINIDAE)
- unicolor, Limicolaria flammea unicolor (W. Kobelt, 1880) - (ACHATINIDAE)
- unicolor, Acmaea unicolor E. Forbes, 1844 - syn of: Tectura virginea (O.F. Müller, 1776) - (ACMAEIDAE)
- unicolor, Acteon tornatilis unicolor A. Scacchi, 1836 - (ACTEONIDAE)
- unicolor, Aplysia unicolor A. Risso, 1818 - syn of: Aplysia punctata (G.L.C.F.D. Cuvier, 1803) - (APLYSIIDAE)
- unicolor, Pisania unicolor (G.F. Angas, 1867) - (BUCCINIDAE)
- unicolor, Bulimulus unicolor (G.B. I Sowerby, 1833) - (BULIMULIDAE)
- unicolor, Drymaeus lilacinus unicolor E.C. Von Martens, 1893 - (BULIMULIDAE)
- unicolor, Neopetraeus cora unicolor (L. Pfeiffer, 1881) - (BULIMULIDAE)
- unicolor, Papuina unicolor (L. Pfeiffer, 1848) - (CAMAENIDAE)
- unicolor, Cardium unicolor G.B. II Sowerby, 1840 - syn of: Acrosterigma simplex (L. Spengler, 1799) - (CARDIIDAE)
- unicolor, Casmaria unicolor (P.M. Pallary, 1926) - (CASSIDAE)
- unicolor, Joculator unicolor A. Cecalupo & I. Perugia, 2012 - (CERITHIOPSIDAE)
- unicolor, Grandinenia unicolor H. Nordsieck, 2012 - (CLAUSILIIDAE)
- unicolor, Albinaria unicolor O. Böttger, 1878 - (CLAUSILIIDAE)
- unicolor, Andiniella flammulata unicolor H. Nordsieck, 2005 - (CLAUSILIIDAE)
- unicolor, Alia unicolor G.B. I Sowerby, 1832 - syn of: Alia unifasciata (G.B. I Sowerby, 1832) - (COLUMBELLIDAE)
- unicolor, Conus unicolor G.B. II Sowerby, 1834 - syn of: Rhizoconus hyaena concolor (G.B. II Sowerby, 1841) - (CONIDAE)
- unicolor, Pusia unicolor M. Herrmann, 2012 - (COSTELLARIIDAE)
- unicolor, Campylaea unicolor S. Clessin, 1887 - syn of: Cingulifera cingulatum baldense (E.A. Rossmässler, 1839) - (HELICIDAE)
- unicolor, Hemicycla unicolor G.P.L.K. Gude, 1896 - syn of: Hemicycla psathyra bituminosa (J.F. Mabille, 1883) - (HELICIDAE)
- unicolor, Helicina variabilis unicolor J.B. von Spix, 1836 - (HELICINIDAE)
- unicolor, Ischnochiton tigrinus unicolor H.A. Pilsbry, 1893 - (ISCHNOCHITONIDAE)
- unicolor, Littorina unicolor K.T. Menke, 1845 - syn of: Littorina obtusata (C. Linnaeus, 1758) - (LITTORINIDAE)
- unicolor, Lottia unicolor E. Forbes, 1844 - syn of: Tectura virginea (O.F. Müller, 1776) - (LOTTIIDAE)
- unicolor, Mactra unicolor J.B.G.M. Bory De Saint-Vincent, 1827 - syn of: Scissodesma nitida (J.F. Gmelin, 1791) - (MACTRIDAE)
- unicolor, Cryptospira strigata unicolor J.J. Bert, 1985 - (MARGINELLIDAE)
- unicolor, Scholvienia bifasciatus unicolor (R.A. Philippi, 1869) - (MEGASPIRIDAE)
- unicolor, Plicopurpura unicolor W.J. Swainson, 1840 - syn of: Haustrum haustorium (J.F. Gmelin, 1791) - (MURICIDAE)
- unicolor, Nassarius unicolor (J.B. Hombron & C.H. Jacquinot, 1848) - (NASSARIIDAE)
- unicolor, Nassa unicolor E.A. Smith, 1884 - syn of: Nassarius dorsatus (P.F. Röding, 1798) - (NASSARIIDAE)
- unicolor, Zeuxis unicolor J.B. Hombron & C.H. Jacquinot, 1848 - syn of: Nassarius unicolor (J.B. Hombron & C.H. Jacquinot, 1848) - (NASSARIIDAE)
- unicolor, Cryptonatica unicolor A.T. von Middendorff, 1849 - syn of: Cryptonatica affinis (J.F. Gmelin, 1791) - (NATICIDAE)
- unicolor, Pecten unicolor J.B.P.A. Lamarck, 1819 - syn of: Flexopecten glaber (C. Linnaeus, 1758) - (PECTINIDAE)
- unicolor, Cyclostoma unicolor G.A. Olivier, 1804 - (POMATIIDAE)
- unicolor, Crassispira unicolor (G.B. I Sowerby, 1834) - (PSEUDOMELATOMIDAE)
- unicolor, Tortulosa nietneri unicolor (J. Collett, 1899) - (PUPINIDAE)
- unicolor, Leiostracus coxeiranus unicolor (S. Moricand, 1836) - (SIMPULOPSIDAE)
- unicolor, Leiostracus vittatus unicolor H.A. Pilsbry, 1892 - (SIMPULOPSIDAE)
- unicolor, Spondylus unicolor G.B. II Sowerby, 1847 - (SPONDYLIDAE)
- unicolor, Succinea unicolor G.W. Tryon, 1866 - (SUCCINEIDAE)
- unicolor, Terebra unicolor H.B. Preston, 1908 - syn of: Terebra amanda R.B. Hinds, 1844 - (TEREBRIDAE)
- unicolor, Triphora unicolor P. Bartsch, 1907 - syn of: Triphora galapagensis P. Bartsch, 1907 - (TRIPHORIDAE)
- unicolor, Obovaria unicolor I. Lea, 1845 - (UNIONIDAE)
- unicolor, Phaneroporus unicolor H.R. Simroth, 1894 - (UROCYCLIDAE)
- unicolor, Lamelliconcha unicolor (G.B. I Sowerby, 1835) - (VENERIDAE)
- unicolor, Eupala unicolor (G.A. Olivier, 1804) - (VIVIPARIDAE)
- unicolor, Cymbium unicolor J.H.F. Link, 1807 - syn of: Cymbium cymbium (C. Linnaeus, 1758) - (VOLUTIDAE)
- unicolor carvoidea, Eupala unicolor carvoidea E.C. Von Martens - (VIVIPARIDAE)
- unicolor elatior, Eupala unicolor elatior (E.C. Von Martens, 1897) - (VIVIPARIDAE)
- unicolor lenfanti, Eupala unicolor lenfanti (J. Germain, 1907) - (VIVIPARIDAE)
- unicolor petenensis, Bulimulus unicolor petenensis P.M.A. Morelet, 1851 - syn of: Bulimulus unicolor (G.B. I Sowerby, 1833) - (BULIMULIDAE)
- unicolor ugandae, Eupala unicolor ugandae G. Mandahl-Barth, 1954 - (VIVIPARIDAE)
- unicolorata, Nassa unicolorata L.A. Reeve, 1853 - syn of: Nassarius dorsatus (P.F. Röding, 1798) - (NASSARIIDAE)
- unicolorata, Powelliphanta lignaria unicolorata (A.W.B. Powell, 1930) - (RHYTIDIDAE)
- unicoloris, Zeuxis unicoloris L.C. Kiener, 1834 - syn of: Nassarius unicolor (J.B. Hombron & C.H. Jacquinot, 1848) - (NASSARIIDAE)
- unicolorum, Buccinum unicolorum L.C. Kiener, 1834 - syn of: Nassarius dorsatus (P.F. Röding, 1798) - (BUCCINIDAE)
- unicolorus, Nassarius unicolorus L.C. Kiener, 1834 - syn of: Nassarius unicolor (J.B. Hombron & C.H. Jacquinot, 1848) - (NASSARIIDAE)
- UNICONIDAE Ljaschenko, 1955 † - Family (TENTACULITA-TENTACULITIDA [Order]) (FOSSIL)
- Uniconocyclites, Genus Uniconocyclites Farsan, 1994 † (UNICONOCYCLITIDAE) (FOSSIL)
- UNICONOCYCLITIDAE Farsan, 1994 † - Family (TENTACULITA-CHONIOCONARIDA [Subclass]-TROMPETOCONARIDA [Superorder]-UNICONOMORPHITIDA [Order]) (FOSSIL)
- Uniconomorphites, Genus Uniconomorphites Farsan, 1994 † (UNICONOMORPHITIDAE) (FOSSIL)
- UNICONOMORPHITIDAE Farsan, 1994 † - Family (TENTACULITA-CHONIOCONARIDA [Subclass]-TROMPETOCONARIDA [Superorder]-UNICONOMORPHITIDA [Order]) (FOSSIL)
- Uniconus, Genus Uniconus Ljaschenko, 1955 † (UNICONIDAE) (FOSSIL)
- unicordata, Odostomia unicordata S. Nomura, 1938 - (PYRAMIDELLIDAE)
- unicordatum, Bathybuccinum unicordatum A.N. Golikov & B.I. Sirenko, 1988 - (BUCCINIDAE)
- unicorne, Buccinum unicorne J.G. Bruguière, 1789 - syn of: Acanthina unicornis (J.G. Bruguière, 1789) - (BUCCINIDAE)
- unicornia, Scintilla unicornia C.F. Lützen & C. Nielsen, 2005 - (GALEOMMATIDAE)
- unicornis, Buccinum unicornis J.G. Bruguière, 1789 - syn of: Acanthina unicornis (J.G. Bruguière, 1789) - (BUCCINIDAE)
- unicornis, Chama unicornis R.A. Philippi, 1836 - syn of: Chama gryphoides C. Linnaeus, 1758 - (CHAMIDAE)
- unicornis, Siphonochelus unicornis R. Houart, 1991 - (MURICIDAE)
- unicornis, Acanthina unicornis (J.G. Bruguière, 1789) - (MURICIDAE)
- unicornis, Murex unicornis L.A. Reeve, 1849 - syn of: Ceratostoma nuttalli (T.A. Conrad, 1837) - (MURICIDAE)
- Unicornis, syn of: Genus Acanthina G. Fischer von Waldheim, 1807 (MURICIDAE)
- unicornis, Tibia unicornis L.W. Dillwyn, 1817 - syn of: Tibia fusus (C. Linnaeus, 1758) - (ROSTELLARIIDAE)
- unicornis, Strombus unicornis L.W. Dillwyn, 1817 - syn of: Tibia fusus (C. Linnaeus, 1758) - (STROMBIDAE)
- unicornis, Cyclostremiscus unicornis (H.A. Pilsbry & A.A. Olsson, 1945) - (TORNIDAE)
- unicornium, Inella unicornium L.R.L. Simone, 2006 - (TRIPHORIDAE)
- unicornu, Formosana antilopina unicornu (O. Böttger & P.B. Schmacker, 1894) - (CLAUSILIIDAE)
- unicoronata, Galeodea unicoronata (A.E.M. Cossmann, 1923 †) - (CASSIDAE) (FOSSIL)
- unicoronata raricrenata, Galeodea unicoronata raricrenata (A.E.M. Cossmann, 1923) - (CASSIDAE)
- unicostata, Chartronella unicostata Batten & A. Stokes, 1986 † - (ATAPHRIDAE) (FOSSIL)
- unicostata, Gyroscala unicostata L.A. Reeve, 1873 - syn of: Gyroscala rupicola (J.D. Kurtz, 1860) - (EPITONIIDAE)
- unicostata, Emarginula unicostata Seeley ex MS Gardner † - (FISSURELLIDAE) (FOSSIL)
- unicostata, Limatula unicostata W.E. Leach in J.E. Gray, 1852 - syn of: Limatula subauriculata (G. Montagu, 1808) - (LIMIDAE)
- unicostata, Pseudorhaphitoma unicostata R.N. Kilburn & H. Dekker, 2008 - syn of: Pseudorhaphitoma uncicostata R.N. Kilburn & H. Dekker, 2008 - (MANGELIIDAE)
- unicrenata, Diplommatina unicrenata H.H. Godwin-Austen, 1892 - (DIPLOMMATINIDAE)
- unicristata, Armenica unicristata O. Böttger, 1877 - (CLAUSILIIDAE)
- unicristata, Armenica unicristata N.N. Akramowski - syn of: Armenica disjuncta (L.L.G. de Mortillet, 1854) - (CLAUSILIIDAE)
- unicum, Clinopegma unicum H.A. Pilsbry, 1905 - syn of: Clinopegma magnum unicum (H.A. Pilsbry, 1905) - (BUCCINIDAE)
- unicum, Buccinum unicum H.A. Pilsbry, 1905 - syn of: Clinopegma magnum unicum (H.A. Pilsbry, 1905) - (BUCCINIDAE)
- unicum, Clinopegma magnum unicum (H.A. Pilsbry, 1905) - (BUCCINIDAE)
- unicum, Calliostoma unicum R.W. Dunker, 1860 - syn of: Tristichotrochus unicus (R.W. Dunker, 1860) - (CALLIOSTOMATIDAE)
- unicum, Homalopoma unicum Y.F. Huang, C.C. Fu & G.T. Poppe, 2016 - (COLLONIIDAE)
- unicum, Salaputium unicum I. Hayami & T. Kase, 1993 - syn of: Salaputium sublamellatum (W. Kobelt, 1885) - (CRASSATELLIDAE)
- unicum, Dagnoceras unicum Kiparisova, 1961 † - syn of: Metadagnoceras unicum (Kiparisova, 1961 †) - (DINARITIDAE) (FOSSIL)
- unicum, Metadagnoceras unicum (Kiparisova, 1961 †) - (KHVALYNITIDAE) (FOSSIL)
- unicum, Schistoceras unicum Miller & Owen, 1937 † - (SCHISTOCERATIDAE) (FOSSIL)
- unicum shinagawense, Calliostoma unicum shinagawense S. Tokunaga, 1906 - syn of: Calliostoma shinagawaense (S. Tokunaga, 1906) - (CALLIOSTOMATIDAE)
- unicus, Doridunculus unicus Matynov & I.S. Roginskaya, 2005 - (AKIODORIDIDAE)
- unicus, Tristichotrochus unicus (R.W. Dunker, 1860) - (CALLIOSTOMATIDAE)
- unicus, Cyclophorus unicus J.F. Mabille, 1887 - (CYCLOPHORIDAE)
- unicus, Vorobyevites unicus Shevyrev, 1995 † - (KHVALYNITIDAE) (FOSSIL)
- unicus, Khvalynites unicus Kiparisova, 1961 † - syn of: Metadagnoceras unicum (Kiparisova, 1961 †) - (KHVALYNITIDAE) (FOSSIL)
- unicus, Eogunnarites unicus (Yabe, 1904 †) - (KOSSMATICERATIDAE) (FOSSIL)
- unicus, Abyssotrophon unicus R.V. Egorov, 1993 - syn of: Abyssotrophon delicatus (J.T. Kuroda, 1953) - (MURICIDAE)
- unicus, Platyceras unicus J.W. Hall, 1879 † - (PLATYCERATIDAE) (FOSSIL)
- unicus, Spondylus unicus F.P. Jousseaume in É. Lamy, 1927 - syn of: Spondylus layardi L.A. Reeve, 1856 - (SPONDYLIDAE)
- unicus, Trochus unicus R.W. Dunker, 1860 - syn of: Tristichotrochus unicus (R.W. Dunker, 1860) - (TROCHIDAE)
- unicus, Turbo unicus G. Montagu, 1803 - syn of: Graphis albida (F. Kanmacher, 1798) - (TURBINIDAE)
- unidens, Modulus unidens Auct. non J.S. Schröter, 1788 - syn of: Modulus guernei P. Dautzenberg, 1900 - (MODULIDAE)
- unidens, Odostomia unidens (Requien, 1848) - (PYRAMIDELLIDAE)
- unidens, Odostomia unidens E. Réquien, 1848 - syn of: Odostomia plicata (G. Montagu, 1803) - (PYRAMIDELLIDAE)
- unidenta, Neritina unidenta T.H. Aldrich, 1911 † - (NERITIDAE) (FOSSIL)
- unidentata, Stylodonta unidentata (H.S. Holten, 1802) - (ACAVIDAE)
- unidentata, Coripia unidentata (B. de Basterot, 1825 †) - (CARDITIDAE) (FOSSIL)
- unidentata, Fectola unidentata F.M. Climo, 1978 - (CHAROPIDAE)
- unidentata, Chondrina unidentata C. Altimira, 1959 - syn of: Chondrina farinesii C. des Moulins, 1835 - (CHONDRINIDAE)
- unidentata, Idyla castalia unidentata (H.C. Küster, 1861) - (CLAUSILIIDAE)
- unidentata, Carychiella eumicrum unidentata (Kókay, 2006 †) - (ELLOBIIDAE) (FOSSIL)
- unidentata, Chondrula unidentata A. Issel, 1866 - syn of: Chondrula tridens (O.F. Müller, 1774) - (ENIDAE)
- unidentata, Nesonanina unidentata W.J. Clench, 1957 - (HELICARIONIDAE)
- unidentata, Helix unidentata J.H. Chemnitz, 1795 - syn of: Stylodonta unidentata (H.S. Holten, 1802) - (HELICIDAE)
- unidentata, Helix unidentata H.S. Holten, 1802 - syn of: Stylodonta unidentata (H.S. Holten, 1802) - (HELICIDAE)
- unidentata, Helicina unidentata L. Pfeiffer, 1849 - syn of: Poenia lirata (L. Pfeiffer, 1847) - (HELICINIDAE)
- unidentata, Petasina unidentata (J.P.R. Draparnaud, 1805) - (HYGROMIIDAE)
- unidentata, Mysella unidentata (N.H. Odhner, 1924) - (MONTACUTIDAE)
- unidentata, Neritina unidentata C.A. Récluz, 1850 - (NERITIDAE)
- unidentata, Pupilla unidentata C.A. Westerlund, 1876 - syn of: Pupilla triplicata (S.E. Studer, 1820) - (PUPILLIDAE)
- unidentata, Pupilla unidentata C. Pfeiffer, 1821 - syn of: Pupilla muscorum (C. Linnaeus, 1758) - (PUPILLIDAE)
- unidentata, Odostomia unidentata (G. Montagu, 1803) - (PYRAMIDELLIDAE)
- unidentata, Gulella unidentata L. Pfeiffer - (STREPTAXIDAE)
- unidentata, Perrottetia unidentata Inkhavilay & S. Panha, 2016 - (STREPTAXIDAE)
- unidentata, Pupisoma unidentata (H.H. Godwin-Austen, 1910) - (VERTIGINIDAE)
- unidentata albella, Odostomia unidentata albella S.L. Lovén, 1846 - syn of: Odostomia unidentata (G. Montagu, 1803) - (PYRAMIDELLIDAE)
- unidentata alpestris, Petasina unidentata alpestris (S. Clessin, 1878) - (HYGROMIIDAE)
- unidentata bohemica, Petasina unidentata bohemica (V. Ložek, 1948) - (HYGROMIIDAE)
- unidentata carpatica, Petasina unidentata carpatica (W. Polinski, 1929) - (HYGROMIIDAE)
- unidentata elata, Odostomia unidentata elata J.G. Jeffreys, 1867 - syn of: Odostomia unidentata (G. Montagu, 1803) - (PYRAMIDELLIDAE)
- unidentata exanthematica, Helix unidentata exanthematica E.C. Von Martens in C.C. von der Decken, 1869 - syn of: Stylodonta unidentata (H.S. Holten, 1802) - (HELICIDAE)
- unidentata globata, Helix unidentata globata E.C. Von Martens in C.C. von der Decken, 1869 - syn of: Stylodonta unidentata (H.S. Holten, 1802) - (HELICIDAE)
- unidentata globosa, Stylodonta unidentata globosa E.C. Von Martens, 1869 - (ACAVIDAE)
- unidentata norica, Petasina unidentata norica (W. Polinski, 1929) - (HYGROMIIDAE)
- unidentata pyramidata, Helix unidentata pyramidata L. Pfeiffer, 1848 - syn of: Stylodonta unidentata (H.S. Holten, 1802) - (HELICIDAE)
- unidentata sarsi, Odostomia unidentata sarsi F. Nordsieck, 1972 - syn of: Odostomia unidentata (G. Montagu, 1803) - (PYRAMIDELLIDAE)
- unidentata sinistrorsa, Helix unidentata sinistrorsa L. Pfeiffer, 1848 - syn of: Stylodonta unidentata (H.S. Holten, 1802) - (HELICIDAE)
- unidentata subalpestris, Petasina unidentata subalpestris (W. Polinski, 1929) - (HYGROMIIDAE)
- unidentatum, Buccinum unidentatum H.C. Küster, 1858 - syn of: Nassarius dentifer (W.L. Powys, 1835) - (BUCCINIDAE)
- unidentatus, Lauria unidentatus J.N. Vallot, 1801 - syn of: Lauria cylindracea (E.M. Da Costa, 1778) - (LAURIIDAE)
- unidentatus, Murex unidentatus G.B. II Sowerby, 1834 - syn of: Murex trapa P.F. Röding, 1798 - (MURICIDAE)
- unidentatus, Spelaeodiscus unidentatus J. Bole, 1961 - (SPELAEODISCIDAE)
- unidentatus, Mirinaba unidentatus (G.B. I Sowerby, 1825) - (STROPHOCHEILIDAE)
- unidentatus, Jujubinus unidentatus (R.A. Philippi, 1844) - (TROCHIDAE)
- unidentatus, Turbo unidentatus G. Montagu, 1803 - syn of: Odostomia unidentata (G. Montagu, 1803) - (TURBINIDAE)
- Unidentia, Genus Unidentia S.V. Millen & A. Hermosillo, 2012 (UNIDENTIIDAE)
- UNIDENTIIDAE Millen & Hermosillo, 2012 - Family (GASTROPODA-HETEROBRANCHIA [Subclass]-OPISTHOBRANCHIA [Infraclass]-NUDIBRANCHIA [Order]-AEOLIDIOIDEA [Superfamily])
- unidigitata, Cyrtulotibia unidigitata (R.B. Newton, 1922 †) - (ROSTELLARIIDAE) (FOSSIL)
- unifasciale, Vexillum unifasciale (J.B.P.A. Lamarck, 1811) - (COSTELLARIIDAE)
- unifasciale, Strigatella unifasciale L.C. Kiener, 1838 - syn of: Strigatella assimilis W.H. Pease, 1868 - (MITRIDAE)
- unifasciale affinis, Vexillum unifasciale affinis (L.A. Reeve, 1844) - (COSTELLARIIDAE)
- unifasciale venustula, Vexillum unifasciale venustula (L.A. Reeve, 1844) - (COSTELLARIIDAE)
- unifascialis, Cryptoconus unifascialis (G.P. Deshayes, 1834 †) - (CONIDAE) (FOSSIL)
- unifascialis, Strigatella unifascialis L.C. Kiener, 1838 - syn of: Strigatella assimilis W.H. Pease, 1868 - (MITRIDAE)
- unifascialis, Mitra unifascialis J.B.P.A. Lamarck, 1811 - syn of: Vexillum unifasciale (J.B.P.A. Lamarck, 1811) - (MITRIDAE)
- unifascialis, Purpura unifascialis J.B.P.A. Lamarck, 1816 - syn of: Stramonita haemastoma (C. Linnaeus, 1767) - (MURICIDAE)
- unifasciata, Nanina unifasciata A. Risso, 1826 - syn of: Cyclope neritea (C. Linnaeus, 1758) - (ARIOPHANTIDAE)
- unifasciata, Barleeia unifasciata (G. Montagu, 1803) - (BARLEEIIDAE)
- unifasciata, Cominella unifasciata G.B. III Sowerby, 1886 - syn of: Orania castanea (H.C. Küster, 1886) - (BUCCINIDAE)
- unifasciata, Cancellaria unifasciata W.H. Dall, 1909 - (CANCELLARIIDAE)
- unifasciata, Solatopupa unifasciata E. Caziot, 1910 - syn of: Solatopupa similis (J.G. Bruguière, 1792) - (CHONDRINIDAE)
- unifasciata, Alia unifasciata (G.B. I Sowerby, 1832) - (COLUMBELLIDAE)
- unifasciata, Columbella unifasciata G.B. I Sowerby, 1832 - syn of: Alia unifasciata (G.B. I Sowerby, 1832) - (COLUMBELLIDAE)
- unifasciata, Purpuradusta fimbriata unifasciata (J.W. Mighels, 1845) - (CYPRAEIDAE)
- unifasciata, Clavus unifasciata E.A. Smith, 1888 - syn of: Clavus enna (W.H. Dall, 1918) - (DRILLIIDAE)
- unifasciata, Rossmaessleria sicanoides unifasciata (W. Kobelt, 1881) - (HELICIDAE)
- unifasciata, Candidula unifasciata (J.L.M. Poiret, 1801) - (HYGROMIIDAE)
- unifasciata, Austrolittorina unifasciata (J.E. Gray, 1826) - (LITTORINIDAE)
- unifasciata, Lacuna unifasciata P.P. Carpenter, 1856 - (LITTORINIDAE)
- unifasciata, Nodilittorina unifasciata J.E. Gray, 1826 - syn of: Austrolittorina unifasciata (J.E. Gray, 1826) - (LITTORINIDAE)
- unifasciata, Littorina unifasciata J.E. Gray, 1826 - syn of: Austrolittorina unifasciata (J.E. Gray, 1826) - (LITTORINIDAE)
- unifasciata, Eucithara unifasciata (G.P. Deshayes, 1834) - (MANGELIIDAE)
- unifasciata, Mangelia unifasciata (G.P. Deshayes, 1835) - (MANGELIIDAE)
- unifasciata, Mangelia unifasciata O.G. Costa, 1844 - syn of: Mangelia vauquelini (B.C.M. Payraudeau, 1826) - (MANGELIIDAE)
- unifasciata, Marginella unifasciata W.H. Turton, 1932 - syn of: Marginella munda E.A. Smith, 1904 - (MARGINELLIDAE)
- unifasciata, Mitromorpha olivoidea unifasciata M.E.J. Bucquoy, P. Dautzenberg & G.F. Dollfus, 1885 - (MITROMORPHIDAE)
- unifasciata, Tritia unifasciata (L.C. Kiener, 1834 †) - (NASSARIIDAE) (FOSSIL)
- unifasciata, Nassa unifasciata L. Paolucci, 1871 - syn of: Cyclope neritea (C. Linnaeus, 1758) - (NASSARIIDAE)
- unifasciata, Natica unifasciata J.B.P.A. Lamarck, 1822 - (NATICIDAE)
- unifasciata, Tibersyrnola unifasciata (E. Forbes, 1844) - (PYRAMIDELLIDAE)
- unifasciata, Turbonilla unifasciata (P.P. Carpenter, 1857) - (PYRAMIDELLIDAE)
- unifasciata, Manzonia unifasciata Dautzemburg, 1889 - (RISSOIDAE)
- unifasciata, Turbinella unifasciata W. Wood, 1828 - syn of: Latirus unifasciatus (W. Wood, 1828) - (TURBINELLIDAE)
- unifasciata, Pleurotoma unifasciata G.P. Deshayes, 1835 - syn of: Mangelia unifasciata (G.P. Deshayes, 1835) - (TURRIDAE)
- unifasciata, Voluta unifasciata W. Wood, 1828 - syn of: Vexillum unifasciatum (W. Wood, 1828) - (VOLUTIDAE)
- unifasciata acosmia, Candidula unifasciata acosmia (J.R. Bourguignat, 1882) - (HYGROMIIDAE)
- unifasciata antipodum, Austrolittorina unifasciata antipodum R.A. Philippi, 1847 - syn of: Austrolittorina antipodum (R.A. Philippi, 1847) - (LITTORINIDAE)
- unifasciata concolor, Cominella unifasciata concolor G.B. III Sowerby, 1897 - syn of: Orania castanea (H.C. Küster, 1886) - (BUCCINIDAE)
- unifasciata derelicta, Mangelia unifasciata derelicta L.A. Reeve, 1846 - (MANGELIIDAE)
- unifasciata fernandezensis, Littorina unifasciata fernandezensis J.P. Rosewater, 1970 - syn of: Austrolittorina fernandezensis (J.P. Rosewater, 1970) - (LITTORINIDAE)
- unifasciata fernandezensis, Austrolittorina unifasciata fernandezensis (J.P. Rosewater, 1970) - syn of: Austrolittorina fernandezensis (J.P. Rosewater, 1970) - (LITTORINIDAE)
- unifasciata galli, Mangelia unifasciata galli (Ant. Bivona-Bernardi, 1838) - (MANGELIIDAE)
- unifasciata nigronodulosa, Cominella unifasciata nigronodulosa W.H. Turton, 1932 - syn of: Orania castanea (H.C. Küster, 1886) - (BUCCINIDAE)
- unifasciata profuga, Candidula unifasciata profuga (A. Schmidt, 1854) - (HYGROMIIDAE)
- unifasciata rugosiuscula, Candidula unifasciata rugosiuscula (A. Michaud, 1831) - (HYGROMIIDAE)
- unifasciata rugulosa, Mangelia unifasciata rugulosa R.A. Philippi, 1844 - (MANGELIIDAE)
- unifasciata soosiana, Candidula unifasciata soosiana (H. Wagner, 1933) - (HYGROMIIDAE)
- unifasciata subangulata, Mangelia unifasciata subangulata (É.A.A. Locard & E. Caziot, 1900) - (MANGELIIDAE)
- unifasciata vincae, Candidula unifasciata vincae (C. De Stefani, 1883) - (HYGROMIIDAE)
- unifasciatum, Vexillum unifasciatum (W. Wood, 1828) - (COSTELLARIIDAE)
- unifasciatum, Epitonium unifasciatum (G.B. II Sowerby, 1844) - (EPITONIIDAE)
- unifasciatum, Canarium unifasciatum (K. Martin, 1916 †) - (STROMBIDAE) (FOSSIL)
- unifasciatus, Naesiotus unifasciatus (G.B. I Sowerby, 1833) - (BULIMULIDAE)
- unifasciatus, Lautoconus unifasciatus (L.C. Kiener, 1850) - (CONIDAE)
- unifasciatus, Latirus unifasciatus (W. Wood, 1828) - (FASCIOLARIIDAE)
- unifasciatus, Phyllonotus unifasciatus A. Adams, 1863 - syn of: Ocinebrellus falcata (G.B. II Sowerby, 1834) - (MURICIDAE)
- unifasciatus, Sinum unifasciatus C.A. Récluz, 1843 - (NATICIDAE)
- unifasciatus, Semelangulus unifasciatus (G.B. Sowerby, 1867) - (TELLINIDAE)
- unifasciatus, Turbo unifasciatus G. Montagu, 1803 - syn of: Barleeia unifasciata (G. Montagu, 1803) - (TURBINIDAE)
- unifilosa, Megastomia unifilosa (E. Saurin, 1962) - (PYRAMIDELLIDAE)
- unifilosa, Lissotesta unifilosa (K.H.J. Thiele, 1912) - (SEGUENZIOIDEA (UNASSIGNED))
- unifilosa, Submargarita unifilosa K.H.J. Thiele, 1912 - syn of: Lissotesta unifilosa (K.H.J. Thiele, 1912) - (TURBINIDAE)
- uniforme, Meghimatium uniforme F.F. Laidlaw, 1937 - (PHILOMYCIDAE)
- uniformis, Strophiops uniformis C.J. Maynard, 1913 - (CERIONIDAE)
- uniformis, Longstaffia uniformis (Reed, 1901 †) - (LOPHOSPIRIDAE) (FOSSIL)
- uniformis, Pleuromya uniformis (Sowerby, 1813 †) - (PLEUROMYIDAE) (FOSSIL)
- uniformis, Pleurotomaria uniformis Reed, 1901 † - syn of: Longstaffia uniformis (Reed, 1901 †) - (PLEUROTOMARIIDAE) (FOSSIL)
- uniformis, Toxoconcha uniformis Stoppani, 1858 † - (PROTORCULIDAE) (FOSSIL)
- uniformis, Stenomelania uniformis (J.R.C. Quoy & J.P. Gaimard, 1834) - (THIARIDAE)
- uniformis, Anticlimax uniformis F. Rubio & E. Rolán, 2014 - (TORNIDAE)
- uniformis, Turmalites uniformis Lyashenko, 1969 † - (TURMALITIDAE) (FOSSIL)
- Uniformites, Genus Uniformites Ljaschenko, 1969 † (TENTACULITIDAE) (FOSSIL)
- Uniformitheca, Genus Uniformitheca Missarzhevsky & Mambetov, 1981 † (TURCUTHECIDAE) (FOSSIL)
- Uniigenus, syn of: Genus Unio L. Philipsson, 1788 (UNIONIDAE)
- unilabiatum, Chondropoma unilabiatum (J. Gundlach in L. Pfeiffer, 1860) - (POMATIIDAE)
- unilabiatum dunkeri, Chondropoma unilabiatum dunkeri (R. Arango in L. Pfeiffer, 1866) - (POMATIIDAE)
- unilabiatum maisianum, Chondropoma unilabiatum maisianum C.G. Aguayo, 1953 - (POMATIIDAE)
- unilabiatum obsoletum, Chondropoma unilabiatum obsoletum C. de la Torre & P. Bartsch, 1938 - (POMATIIDAE)
- unilabiatum rubrum, Chondropoma unilabiatum rubrum C. de la Torre & P. Bartsch, 1938 - (POMATIIDAE)
- unilabiatum unilahiatum, Chondropoma unilabiatum unilahiatum (J. Gundlach in L. Pfeiffer, 1860) - (POMATIIDAE)
- unilahiatum, Chondropoma unilabiatum unilahiatum (J. Gundlach in L. Pfeiffer, 1860) - (POMATIIDAE)
- unilamellata, Bulimus unilamellata D'Orbigny, 1842 - syn of: Leptinaria unilamellata (A.V.M.D. D'Orbigny, 1842) - (BULIMULIDAE)
- unilamellata, Mautodontha unilamellata (A. Garrett, 1884) - (ENDODONTIDAE)
- unilamellata, Leptinaria unilamellata (A.V.M.D. D'Orbigny, 1842) - (SUBULINIDAE)
- unilamellatus, Ptychodon unilamellatus W.K. Weyrauch, 1965 - (CHAROPIDAE)
- Unilamellatus, syn of: Genus Rotadiscus H.A. Pilsbry, 1926 (CHAROPIDAE)
- unilateralis, Cucullaea unilateralis Sowerby, 1840 † - syn of: Dolabra unilateralis (Sowerby, 1840 †) - (CUCULLAEIDAE) (FOSSIL)
- unilateralis, Gregorioiscala unilateralis (E.C. Von Martens, 1902) - (EPITONIIDAE)
- unilateralis, Haliotis unilateralis J.B.P.A. Lamarck, 1822 - (HALIOTIDAE)
- unilateralis, Dolabra unilateralis (Sowerby, 1840 †) - (MYOPHORICARDIIDAE) (FOSSIL)
- unilateralis, Thyasira unilateralis K.H. Barnard, 1964 - (THYASIRIDAE)
- unilineata, Aeolidia unilineata J. Alder & A. Hancock, 1864 - syn of: Phidiana unilineata (J. Alder & A. Hancock, 1864) - (AEOLIDIIDAE)
- unilineata, Xesta unilineata H. Fischer, 1898 - syn of: Chalepotaxis infantilis (P.V. Gredler, 1884) - (ARIOPHANTIDAE)
- unilineata, Engina mendicaria unilineata P. Dautzenberg, 1929 - (BUCCINIDAE)
- unilineata, Chaetopleura unilineata E.H.J. Leloup, 1954 - (CHAETOPLEURIDAE)
- unilineata, Acrilla unilineata A. Heilprin, 1880 † - (EPITONIIDAE) (FOSSIL)
- unilineata, Eulima unilineata (A. Adams & L.A. Reeve, 1850) - (EULIMIDAE)
- unilineata, Phidiana unilineata (J. Alder & A. Hancock, 1864) - (FACELINIDAE)
- unilineata, Eucithara unilineata (E.A. Smith, 1876) - (MANGELIIDAE)
- unilineata, Volvarina unilineata (F.P. Jousseaume, 1875) - (MARGINELLIDAE)
- unilineata, Mitromorpha unilineata M. Chino & P. Stahlschmidt, 2014 - (MITROMORPHIDAE)
- unilineata, Syrnola unilineata (A. Garrett, 1873) - (PYRAMIDELLIDAE)
- unilineata, Gemmula congener unilineata A.W.B. Powell, 1967 - (TURRIDAE)
- unilineatum, Cerithium unilineatum W.H. Pease, 1861 - syn of: Cerithium zebrum L.C. Kiener, 1841 - (CERITHIIDAE)
- unilineatum, Terebra unilineatum T.A. Conrad, 1841 † - (TEREBRIDAE) (FOSSIL)
- unilirata, Mauidrillia unilirata Powell, 1942 † - (HORAICLAVIDAE) (FOSSIL)
- unilirata, Lironoba unilirata (J.E. Tenison-Woods, 1878) - (RISSOIDAE)
- uniliratum, Turbolidium uniliratum (K.J. Bush, 1899) - (PYRAMIDELLIDAE)
- uniliratus, Scrupus uniliratus A.W.B. Powell, 1931 - (TORNIDAE)
- unilobatus, Sellagoniatites unilobatus (J.W. Hall, 1879 †) - (AGONIATITIDAE) (FOSSIL)
- unilobatus, Cadulus unilobatus V. Scarabino & F. Scarabino, 2011 - (GADILIDAE)
- unilobatus, Goniatites unilobatus J.W. Hall, 1879 † - syn of: Sellagoniatites unilobatus (J.W. Hall, 1879 †) - (GONIATITIDAE) (FOSSIL)
- unimaculata, Imaclava unimaculata (G.B. I Sowerby, 1834) - (DRILLIIDAE)
- unimaculata, Cyllene unimaculata A. Adams, 1855 - (NASSARIIDAE)
- unimaculata, Natica unimaculata L.A. Reeve, 1855 - syn of: Polinices otis W.J. Broderip & Sowerby, 1829 - (NATICIDAE)
- unimaculata, Tellina radiata unimaculata J.B.P.A. Lamarck, 1818 - (TELLINIDAE)
- unimaculata, Pleurotoma unimaculata G.B. I Sowerby, 1834 - syn of: Imaclava unimaculata (G.B. I Sowerby, 1834) - (TURRIDAE)
- unimaculatum, Corculum unimaculatum G.B. I Sowerby in W.J. Broderip & G.B. I Sowerby, 1833 - syn of: Corculum cardissa (C. Linnaeus, 1758) - (CARDIIDAE)
- unimaculatus, Polinices unimaculatus L.A. Reeve, 1855 - syn of: Polinices otis W.J. Broderip & Sowerby, 1829 - (NATICIDAE)
- uninodocarinata, Neilsonia uninodocarinata (Hyde, 1953 †) - (GOSSELETINIDAE) (FOSSIL)
- uninodocarinata, Murchisonia uninodocarinata Hyde, 1953 † - syn of: Neilsonia uninodocarinata (Hyde, 1953 †) - (MURCHISONIIDAE) (FOSSIL)
- uninodum, Cacheoceras uninodum Flower, 1976 † - (ALLOTRIOCERATIDAE) (FOSSIL)
- Unio, Genus Unio L. Philipsson, 1788 (UNIONIDAE)
- unioides, Crassatella unioides (Stanton †) - (CRASSATELLIDAE) (FOSSIL)
- unioides, Pleurophopsis unioides van Winkle, 1919 † - (KELLIELLIDAE) (FOSSIL)
- unioides, Pleuromya unioides (F.A. Roemer, 1835 †) - (PLEUROMYIDAE) (FOSSIL)
- unioides, Lamellidens unioides H. Nesemann, S. Sharma, G. Sharma & al., 2007 - (UNIONIDAE)
- Uniomerus, Genus Uniomerus T.A. Conrad, 1853 (UNIONIDAE)
- unionae, Crioceratites unionae (Dimitrova, 1967 †) - (CRIOCERATITIDAE) (FOSSIL)
- unionae, Hamulina unionae Dimitrova, 1967 † - syn of: Crioceratites unionae (Dimitrova, 1967 †) - (HAMULINIDAE) (FOSSIL)
- Unionea, syn of: Genus Unio L. Philipsson, 1788 (UNIONIDAE)
- Unionella, Genus Unionella Etheridge, 1888 (UNIONELLIDAE) (FOSSIL)
- UNIONELLIDAE Skawina & Dzik, 2011 † - Family (BIVALVIA-PALAEOHETERODONTA [Subclass]-UNIONIDA [Order]-SILESUNIONOIDEA [Superfamily]) (FOSSIL)
- Unionelloides, Genus Unionelloides Gu, 1962 † (UNIONIDAE) (FOSSIL)
- unionensis, Eratoidea unionensis T. McCleery, 2011 - (MARGINELLIDAE)
- Unionerus, syn of: Genus Uniomerus T.A. Conrad, 1853 (UNIONIDAE)
- Unionetta, Genus Unionetta F. Haas, 1955 (UNIONIDAE)
- UNIONIDA (UNASSIGNED) - Family (BIVALVIA-PALAEOHETERODONTA [Subclass]-UNIONIDA [Order]) (FOSSIL)
- UNIONIDAE Rafinesque, 1820 - Family (BIVALVIA-PALAEOHETERODONTA [Subclass]-UNIONIDA [Order]-UNIONOIDEA [Superfamily])
- unioniformis, Edmondia unioniformis (B. Phillips, 1836 †) - (EDMONDIIDAE) (FOSSIL)
- unioniformis, Celtoides unioniformis Newell, 1957 † - (KALENTERIDAE) (FOSSIL)
- unioniformis, Prothyris unioniformis Yang, 1983 † - (PROTHYRIDAE) (FOSSIL)
- unioniformis, Sanguinolites unioniformis Winchell, 1862 † - (SANGUINOLITIDAE) (FOSSIL)
- Unionites, Genus Unionites Wissman, 1841 † (TRIGONODIDAE) (FOSSIL)
- Unionium, syn of: Genus Pinctada P.F. Röding, 1798 (PTERIIDAE)
- unionoides, Ischyrodonta unionoides F.B. Meek, 1893 † - (ISCHYRODONTIDAE) (FOSSIL)
- unionoides westonensis, Ischyrodonta unionoides westonensis Foerste, 1924 † - (ISCHYRODONTIDAE) (FOSSIL)
- Unionum, syn of: Genus Pinctada P.F. Röding, 1798 (PTERIIDAE)
- Unionvillites, Genus Unionvillites Silberling & Nichols, 1982 † (DANUBITIDAE) (FOSSIL)
- uniophora, Neotrigonia uniophora (Gray, 1847) - (TRIGONIIDAE)
- uniophora, Trigonia uniophora J.E. Gray in J.B. Jukes, 1847 - syn of: Neotrigonia uniophora (Gray, 1847) - (TRIGONIIDAE)
- uniophora crebrisculpta, Neotrigonia uniophora crebrisculpta N.H. Odhner, 1917 - syn of: Neotrigonia uniophora (Gray, 1847) - (TRIGONIIDAE)
- uniophora crebrisculpta, Trigonia uniophora crebrisculpta N.H. Odhner, 1917 - syn of: Neotrigonia uniophora (Gray, 1847) - (TRIGONIIDAE)
- uniopsis, Anodonta uniopsis J.B.P.A. Lamarck, 1819 - syn of: Microcondylaea compressa (K.T. Menke, 1830) - (UNIONIDAE)
- Uniopsis, syn of: Genus Alasmidonta T. Say, 1818 (UNIONIDAE)
- uniornatum, Acrosterigma uniornatum E. Vidal, 1999 - (CARDIIDAE)
- unipalatalis, Albinaria amalthea unipalatalis H. Nordsieck, 2017 - (CLAUSILIIDAE)
- unipalatalis, Alopia glauca unipalatalis M. von Kimakowicz, 1883 - (CLAUSILIIDAE)
- Unipeltoceras, Genus Unipeltoceras Jeannet , 1951 † (ASPIDOCERATIDAE) (FOSSIL)
- uniperata, Pruvotina uniperata L. Salvini-Plawén, 1978 - (PRUVOTINIDAE)
- Uniplicaria, Subgenus Gulella (Uniplicaria) L. Pfeiffer, 1856 (STREPTAXIDAE)
- uniplicata, Auriculella uniplicata W.H. Pease, 1868 - (ACHATINELLIDAE)
- uniplicata, Amastra uniplicata W.D. Hartman, 1888 - (AMASTRIDAE)
- uniplicata, Borsonia uniplicata (A. von Koenen, 1872 ) - (BORSONIIDAE)
- uniplicata, Cancellaria uniplicata G.B. I Sowerby, 1832 - syn of: Hertleinia mitriformis (Sowerby, 1832) - (CANCELLARIIDAE)
- uniplicata, Euphaedusa loczyi uniplicata H. Nordsieck, 2012 - (CLAUSILIIDAE)
- uniplicata, Cecilioides uniplicata J.R. Bourguignat, 1864 - syn of: Cecilioides acicula (O.F. Müller, 1774) - (FERUSSACIIDAE)
- uniplicata, Helix uniplicata A.E.J. Férussac, 1827 - syn of: Bulimulus uniplicatus (A.E.J. Férussac, 1827) - (HELICIDAE)
- uniplicata, Simnialena uniplicata (G.B. II Sowerby, 1849) - (OVULIDAE)
- uniplicata, Ovulum uniplicata G.W. Tryon, 1885 - syn of: Simnia avena (G.B. II Sowerby, 1832) - (OVULIDAE)
- uniplicata, Simnia uniplicata Sowerby, 1848 - syn of: Simnialena uniplicata (G.B. II Sowerby, 1849) - (OVULIDAE)
- uniplicata, Neosimnia uniplicata C.W. Andrews, 1971 - syn of: Simnialena marferula C.N. Cate, 1973 - (OVULIDAE)
- uniplicata, Chondrothyra uniplicata C. de la Torre & P. Bartsch, 1938 - (POMATIIDAE)
- uniplicata, Ringicula uniplicata F.W. Hutton, 1885 † - (RINGICULIDAE) (FOSSIL)
- uniplicata, Kurodina uniplicata G.B. III Sowerby, 1900 - syn of: Fulgoraria smithi (G.B. III Sowerby, 1901) - (VOLUTIDAE)
- uniplicata ibarrae, Chondrothyra uniplicata ibarrae M.L. Jaume, 1984 - (POMATIIDAE)
- uniplicata jucunda, Auriculella uniplicata jucunda H.A. Pilsbry & C.M. Cooke, 1915 - (ACHATINELLIDAE)
- uniplicata vetuscula, Amastra uniplicata vetuscula C.M. Cooke, 1917 - (AMASTRIDAE)
- uniplicatum, Atomodesma uniplicatum C.O. Waterhouse, 1979 † - (ATOMODESMATIDAE) (FOSSIL)
- uniplicatus, Bulimulus uniplicatus (A.E.J. Férussac, 1827) - (BULIMULIDAE)
- uniplicatus, Clavilithes uniplicatus (J.B.P.A. Lamarck, 1803 †) - (FASCIOLARIIDAE) (FOSSIL)
- uniplicatus, Discostrobilops uniplicatus (A. Braun in Walchner, 1851 †) - (STROBILOPSIDAE) (FOSSIL)
- uniradiata, Gari uniradiata (G.B. Brocchi, 1814 †) - (PSAMMOBIIDAE) (FOSSIL)
- uniradiatus, Solecurtus uniradiatus (G.B. Brocchi, 1814 †) - (SOLECURTIDAE) (FOSSIL)
- uniseriale, Cerithium uniseriale Sowerby, 1849 † - (CERITHIIDAE) (FOSSIL)
- uniserialis, Cominella uniserialis (Sanberger, 1863 †) - (BUCCINIDAE) (FOSSIL)
- uniserialis, Turris uniserialis (G.P. Deshayes †) - (TURRIDAE) (FOSSIL)
- uniseriata, Galeodea uniseriata F. Settepassi, 1970 - syn of: Galeodea echinophora (C. Linnaeus, 1758) - (CASSIDAE)
- uniserrata, Kinkaidia uniserrata (Batten, 1966 †) - (MICRODOMATIDAE) (FOSSIL)
- unisinuata, Aporrhais unisinuata (C.L.F. von Sandberger, 1861 †) - (APORRHAIDAE) (FOSSIL)
- unispathulata, Kokopapa unispathulata F.M. Climo & Mahlfeld, 2011 - (PUNCTIDAE)
- unispinosa, Cuphotifer unispinosa (Moore, 1867 †) - (APORRHAIDAE) (FOSSIL)
- unispinosa, Alaria unispinosa Moore, 1867 † - syn of: Cuphotifer unispinosa (Moore, 1867 †) - (APORRHAIDAE) (FOSSIL)
- unispinosa, Eupleura unispinosa W.H. Dall, 1890 - syn of: Eupleura muriciformis (W.J. Broderip, 1833) - (MURICIDAE)
- unispinosum, Unipeltoceras unispinosum (F.A. von Quenstedt, 1847 †) - (ASPIDOCERATIDAE) (FOSSIL)
- unispirata, Scissurella unispirata K. Bandel, 1998 - syn of: Scissurella evaensis K. Bandel, 1998 - (SCISSURELLIDAE)
- unistriata, Exiligada unistriata F. Criscione, A. Law & F. Köhler, 2012 - (CAMAENIDAE)
- unistriata, Cardiomya unistriata J.A. Allen, 2011 - (CUSPIDARIIDAE)
- unisulca, Rissoa unisulca Buvignier, 1843 † - (RISSOIDAE) (FOSSIL)
- unisulcata, Ambonychinia unisulcata Isberg, 1934 † - (AMBONYCHIIDAE) (FOSSIL)
- unisulcata, Perrona unisulcata A.E.M. Cossmann, 1900 † - (CLAVATULIDAE) (FOSSIL)
- unisulcata, Columbella unisulcata W. Kobelt, 1897 - syn of: Pseudamycla miltostoma (J.E. Tenison-Woods, 1877) - (COLUMBELLIDAE)
- unisulcata, Pseudamycla unisulcata W. Kobelt, 1897 - syn of: Pseudamycla miltostoma (J.E. Tenison-Woods, 1877) - (COLUMBELLIDAE)
- unisulcata, Platystoma unisulcata T.A. Conrad, 1842 † - syn of: Platyostoma unisulcata (T.A. Conrad, 1842 †) - (GASTROPODA INCERTAE SEDIS) (FOSSIL)
- unisulcata, Matsumotoa unisulcata (Amano 1956) † - (NOETIIDAE) (FOSSIL)
- unisulcata, Platyostoma unisulcata (T.A. Conrad, 1842 †) - (PLATYCERATIDAE) (FOSSIL)
- unisulcata, Platyclymenia unisulcata Czarnocki, 1989 † - (PLATYCLYMENIIDAE) (FOSSIL)
- unisulcata, Bathrotomaria unisulcata H. Winkler, 1989 † - syn of: Pleurotomaria subornata Münster, 1844 † - (PLEUROTOMARIIDAE) (FOSSIL)
- unisulcata, Tjaernoeia unisulcata (G.W. Chaster, 1897) - (TJAERNOEIIDAE)
- unisulcata, Turritella unisulcata J.B.P.A. Lamarck, 1804 † - (TURRITELLIDAE) (FOSSIL)
- unisulcatus, Rhinoclavis unisulcatus (J.B.P.A. Lamarck, 1804 †) - (CERITHIIDAE) (FOSSIL)
- unisulcatus, Cerithiopsis unisulcatus Author unknown † - (CERITHIOPSIDAE) (FOSSIL)
- unisulcatus, Pedipes unisulcatus J.G. Cooper, 1866 - (ELLOBIIDAE)
- unisulcatus, Polinices unisulcatus (J. Marwick, 1924 †) - (NATICIDAE) (FOSSIL)
- unisulcatus, Tornus unisulcatus (G.W. Chaster, 1896) - (TORNIDAE)
- unitaeniata, Chromodoris annae unitaeniata E. André, 1896 - (CHROMODORIDIDAE)
- unitaeniata, Helix unitaeniata O. Böttger, 1885 - syn of: Helix pomatia C. Linnaeus, 1758 - (HELICIDAE)
- Unitas, Genus Unitas K.V.W. Palmer, 1947 (CANCELLARIIDAE)
- unituberculata, Latitrigonia unituberculata Kobayashi & Tamura, 1957 † - (TRIGONIIDAE) (FOSSIL)
- unituberculatum, Crioceratites requienianum unituberculatum Sarkar, 1955 † - (CRIOCERATITIDAE) (FOSSIL)
- unituberculatus, Balearites balearis unituberculatus Sarkar, 1955 † - (CRIOCERATITIDAE) (FOSSIL)
- unius, Mastus unius (O. Böttger, 1885) - (ENIDAE)
- uniuspecei, Eulimella uniuspecei A. Peñas & E. Rolán, 2016 - (PYRAMIDELLIDAE)
- universa, Strophiops universa C.J. Maynard, 1913 - (CERIONIDAE)
- universitatis, Chromodoris universitatis T.D.A. Cockerell, 1901 - syn of: Felimare californiensis (L.S.R. Bergh, 1879) - (CHROMODORIDIDAE)
- universitatis, Hypselodoris universitatis T.D.A. Cockerell, 1901 - syn of: Felimare californiensis (L.S.R. Bergh, 1879) - (CHROMODORIDIDAE)
- univestis, Egila univestis C.F. Laseron, 1959 - (PYRAMIDELLIDAE)
- univitta, Aclophoropsis univitta (C.F. Laseron, 1954) - (TRIPHORIDAE)
- unizonalis, Alia unizonalis J.E. Gray, 1839 - syn of: Alia unifasciata (G.B. I Sowerby, 1832) - (COLUMBELLIDAE)
- unizonalis, Columbella unizonalis J.E. Gray, 1839 - syn of: Alia unifasciata (G.B. I Sowerby, 1832) - (COLUMBELLIDAE)
- unizonalis, Clavus unizonalis (J.B.P.A. Lamarck, 1822) - (DRILLIIDAE)
- unizonalis, Oliva carneola unizonalis P. Dautzenberg, 1927 - (OLIVIDAE)
- unizonalis, Pleurotoma unizonalis J.B.P.A. Lamarck, 1822 - syn of: Clavus unizonalis (J.B.P.A. Lamarck, 1822) - (TURRIDAE)
- unizonata, Leiostyla unizonata J.R. Bourguignat, 1869 - syn of: Leiostyla anglica (W. Wood, 1828) - (LAURIIDAE)
- Unklesbayella, Genus Unklesbayella Hoare & al., 1978 † (MEGADESMIDAE) (FOSSIL)
- unklesbayi, Metacoceras unklesbayi Miller & Youngquist, 1949 † - (TAINOCERATIDAE) (FOSSIL)
- Unklesbyella, syn of: Genus Unklesbayella Hoare & al., 1978 † (MEGADESMIDAE) (FOSSIL)
- Unquatornoceras, Genus Unquatornoceras † (GONIATITIDA (UNASSIGNED)) (FOSSIL)
- unsa, Aglaja unsa Er. Marcus & Ev. Marcus, 1969 - (AGLAJIDAE)
- untalatum, Acaroceras untalatum B.Z. Li, 1984 † - (ACAROCERATIDAE) (FOSSIL)
- unthanksensis, Holsingeria unthanksensis (R. Hershler, 1989) - (HYDROBIIDAE)
- unulatoplicatile, Pseudogarnieria unulatoplicatile (Stchirowsky, 1894 †) - (NEOCOMITIDAE) (FOSSIL)
- unuscarinatum, Buccinum unuscarinatum R. Tiba, 1981 - (BUCCINIDAE)
- unzhensis, Shurovites unzhensis A.V. Guzhov, 2004 † - (CRYPTAULACIDAE) (FOSSIL)
- unzhensis, Cryptaulax unzhensis A.V. Guzhov, 2004 † - (CRYPTAULACIDAE) (FOSSIL)
- uozumi, Diplommatina uozumi H. Minato, 1976 - (DIPLOMMATINIDAE)
- upanemensis, Hippochrenes upanemensis Beurlen, 1964 † - (ROSTELLARIIDAE) (FOSSIL)
- upatoiensis, Exogyra upatoiensis L.W. Stephenson, 1914 † - (GRYPHAEIDAE) (FOSSIL)
- Upella, Genus Upella Pchelintsev, 1968 † (OPISTHOBRANCHIA (UNASSIGNED)) (FOSSIL)
- upembae, Truncatellina upembae W. Adam, 1954 - (VERTIGINIDAE)
- Upembella, Genus Upembella B. Rowson & J.L. van Goethem, 2012 (UROCYCLIDAE)
- Uperotus, Genus Uperotus J.É. Guettard, 1770 (TEREDINIDAE)
- upjohnni, Deceptrix upjohnni (Portlock, 1843 †) - (CARDIOLARIIDAE) (FOSSIL)
- upolensis, Ostodes upolensis A. Mousson - (NEOCYCLOTIDAE)
- upolensis, Stenogyra upolensis A. Mousson - syn of: Opeas operanum (L. Pfeiffer, 1846) - (SUBULINIDAE)
- Upsilodon, Subgenus Polygyra (Upsilodon) H.A. Pilsbry, 1930 (POLYGYRIDAE)
- uptonense, Neocardioceras uptonense Cobban, 1988 † - (ACANTHOCERATIDAE) (FOSSIL)
- uptonensis, Alcithoe uptonensis L. C. King, 1934 † - (VOLUTIDAE) (FOSSIL)
- Uptonia, Genus Uptonia Geczy, 1976 † (POLYMORPHITIDAE) (FOSSIL)
- uptonioides, Pseudarisphinctes uptonioides Enay, 1966 † - syn of: Passendorferia uptonioides (Enay, 1966 †) - (AMMONOIDEA (unassigned)) (FOSSIL)
- uptonioides, Passendorferia uptonioides (Enay, 1966 †) - (PERISPHINCTIDAE) (FOSSIL)
- upwarensis, Astarte upwarensis H. Woods, 1891 † - (ASTARTIDAE) (FOSSIL)
- upwarensis, Belemnites upwarensis Keeping, 1883 † - (BELEMNITELLIDAE) (FOSSIL)
- upwarensis, Cardita upwarensis Woods, 1906 † - (CARDITIDAE) (FOSSIL)
- upwarensis, Littorina upwarensis Keeping † - (LITTORINIDAE) (FOSSIL)
- upwarensis, Oistotrigonia upwarensis (Lycett, 1875) † - (PTEROTRIGONIIDAE) (FOSSIL)
- urabaensis, Pomacea cumingii urabaensis T. Pain, 1956 - (AMPULLARIIDAE)
- urahoroensis, Provanna urahoroensis K. Amano & B.W. Jenkins, 2013 † - (PROVANNIDAE) (FOSSIL)
- Urakawites, Genus Urakawites Matsumoto, 1955 † (PACHYDISCIDAE) (FOSSIL)
- uralense, Gzheloceras uralense Ruzhentsev & Shimanskiy, 1954 † - (GZHELOCERATIDAE) (FOSSIL)
- uralense, Intoceras uralense Kusina, 1971 † - (INTOCERATIDAE) (FOSSIL)
- uralense, Coelogasteroceras uralense I.S. Barskov & Shilovsky, 2014 † - (LIROCERATIDAE) (FOSSIL)
- uralense, Schistoceras uralense Ruzhentsev, 1939 † - (SCHISTOCERATIDAE) (FOSSIL)
- uralense, Nothosporadoceras uralense Bogoslovsky, 1971 † - (SPORADOCERATIDAE) (FOSSIL)
- uralense, Sporadoceras uralense Tokarenko, 1903 † - syn of: Sporadoceras bidens (C.L.F. von Sandberger, 1851 †) - (SPORADOCERATIDAE) (FOSSIL)
- uralense, Fasciculoceras uralense Bogoslovsky, 1969 † - (TEICHERTICERATIDAE) (FOSSIL)
- uralensis, Marathonites uralensis Ruzhentsev, 1940 † - (ADRIANITIDAE) (FOSSIL)
- uralensis, Agoniatites uralensis Bogoslovsky, 1969 † - syn of: Chlupacites uralensis (Bogoslovsky, 1969 †) - (AGONIATITIDAE) (FOSSIL)
- uralensis, Zonovia uralensis (A.V.M.D. D'Orbigny, 1845 †) - (AULACOSTEPHANIDAE) (FOSSIL)
- uralensis, Amphiscapha uralensis Licharev, 1975 † - (EUOMPHALIDAE) (FOSSIL)
- uralensis, Glaphyrites uralensis Ruzhentsev & Bogoslovskaya, 1971 † - (GLAPHYRITIDAE) (FOSSIL)
- uralensis, Pyrgula uralensis B.M. Logvinenko & Y.I. Starobogatov, 1968 - (HYDROBIIDAE)
- uralensis, Aquilonites uralensis A.M. Popov & Kusina, 1997 † - (INTOCERATIDAE) (FOSSIL)
- uralensis, Koenenites uralensis Bogoslovsky, 1969 † - (KOENENITIDAE) (FOSSIL)
- uralensis, Chlupacites uralensis (Bogoslovsky, 1969 †) - (LATANARCESTIDAE) (FOSSIL)
- uralensis, Stenopronorites uralensis (Karpinsky, 1889 †) - (PRONORITIDAE) (FOSSIL)
- uralica, Kiaclymenia uralica (Bogoslovsky, 1955 †) - (BILOCLYMENIIDAE) (FOSSIL)
- uralica, Cyrtoclymenia uralica Nalivkina † - (CYRTOCLYMENIIDAE) (FOSSIL)
- uralica, Myophorella uralica Saveliev, 1960 † - (MYOPHORELLIDAE) (FOSSIL)
- uralica, Falciclymenia uralica Bogoslovsky, 1960 † - (RECTOCLYMENIIDAE) (FOSSIL)
- uralicum, Agathiceras uralicum (Karpinsky, 1874 †) - (AGATHICERATIDAE) (FOSSIL)
- uralicum, Conocardium uralicum (Verneuil, 1845 †) - (CONOCARDIIDAE) (FOSSIL)
- uralicum, Gephyroceras uralicum Holzapfel, 1899 † - syn of: Ponticeras uralicum (Holzapfel, 1899 †) - (GEPHUROCERATIDAE) (FOSSIL)
- uralicum, Trigonogastrioceras uralicum Librovich, 1957 † - (GONIATITIDA (UNASSIGNED)) (FOSSIL)
- uralicum, Hexameroceras uralicum Kiselev, 1984 † - (HEMIPHRAGMOCERATIDAE) (FOSSIL)
- uralicum, Ponticeras uralicum (Holzapfel, 1899 †) - (PONTICERATIDAE) (FOSSIL)
- uralicum, Praeglyphioceras uralicum Nalivkina, 1936 † - (PRAEGLYPHIOCERATIDAE) (FOSSIL)
- uralicum, Neothrincoceras uralicum (Fredericks, 1915 †) - (THRINCOCERATIDAE) (FOSSIL)
- uralicum, Werneroceras uralicum Bogoslovsky, 1959 † - (WERNEROCERATIDAE) (FOSSIL)
- uralicus, Pericleites uralicus Librovitch, 1941 † - (AGATHICERATIDAE) (FOSSIL)
- uralicus, Aviculopecten uralicus Fredericks, 1915 † - (AVICULOPECTINIDAE) (FOSSIL)
- uralicus, Uralobactrites uralicus Doguzhaeva, 2002 † - (BACTRITIDAE) (FOSSIL)
- uralicus, Bellerophon uralicus Murchison & al., 1845 † - syn of: Ptychosphaera ouralicus (Murchison & al., 1845 †) - (BELLEROPHONTIDAE) (FOSSIL)
- uralicus, Parallelodon uralicus Muromtseva, 1984 † - (PARALLELODONTIDAE) (FOSSIL)
- Uralobactrites, Genus Uralobactrites Doguzhaeva , 2002 † (BACTRITIDAE) (FOSSIL)
- Uraloceras, Genus Uraloceras Ruzhencev , 1936 † (PARAGASTRIOCERATIDAE) (FOSSIL)
- Uraloclymenia, Genus Uraloclymenia Bogoslovskii, 1977 † (PACHYCLYMENIIDAE) (FOSSIL)
- Uralopronorites, Genus Uralopronorites Librovitch & Ruzhencev, 1949 † (PRONORITIDAE) (FOSSIL)
- Uralopteria, Genus Uralopteria Kulikova, 1983 † (PTERIIDA (UNASSIGNED)) (FOSSIL)
- Uralorthoceras, Genus Uralorthoceras Shimanskiy, 1951 † (PSEUDORTHOCERATIDAE) (FOSSIL)
- Uralyroceras, Genus Uralyroceras Korn & Titus, 2015 † (NEOGLYPHIOCERATIDAE) (FOSSIL)
- Urambella, syn of: Genus Pyramidella J.B.P.A. Lamarck, 1799 (PYRAMIDELLIDAE)
- urania, Rhinoclavis urania (Orbigny, 1850 †) - (CERITHIIDAE) (FOSSIL)
- urania, Aesopus urania J.C. Melvill & R. Standen, 1901 - (COLUMBELLIDAE)
- urania, Buccinaria urania (E.A. Smith, 1906) - (RAPHITOMIDAE)
- urania, Pleurotoma urania E.A. Smith, 1906 - syn of: Buccinaria urania (E.A. Smith, 1906) - (TURRIDAE)
- uranipponense, Calliostoma uranipponense (T.A. Okutani, 1969) - (CALLIOSTOMATIDAE)
- uraniscoptyx, Thaumatoptyx uraniscoptyx (P.B. Schmacker & O. Böttger, 1891) - (CLAUSILIIDAE)
- uraniscoptyx diploptyx, Thaumatoptyx uraniscoptyx diploptyx H. Nordsieck, 2005 - (CLAUSILIIDAE)
- Uranoceras, Genus Uranoceras Hyatt, 1884 † (URANOCERATIDAE) (FOSSIL)
- URANOCERATIDAE Hyatt, 1900 † - Family (CEPHALOPODA-NAUTILOIDEA [Subclass]-BARRANDEOCERIDA [Order]) (FOSSIL)
- uranops, Cochlorina uranops H.A. Pilsbry, 1898 - (BULIMULIDAE)
- Uranoteuthis, syn of: Genus Sandalops C. Chun, 1906 (CRANCHIIDAE)
- uranum, Uranoceras uranum (Barrande, 1866 †) - (URANOCERATIDAE) (FOSSIL)
- uranus, Clypeomorus uranus C.É. Bayle, 1880 - syn of: Clypeomorus bifasciata (G.B. II Sowerby, 1855) - (CERITHIIDAE)
- uranus, Ryssota uranus (L. Pfeiffer, 1861) - (CHRONIDAE)
- urarensis, Montidelos urarensis (J.C. Cox, 1866) - (RHYTIDIDAE)
- urartaeica, Orculella ruderalis urartaeica B. Hausdorf, 1996 - (ORCULIDAE)
- urashimanum, Bittium urashimanum S. Nomura & H. Niino, 1940 - (CERITHIIDAE)
- urashimanus, Kioconus urashimanus (J.T. Kuroda & K. Itô, 1961) - (CONIDAE)
- urasima, Amalda urasima T. Kira, 1955 - syn of: Amalda hinomotoensis urasima T. Kira, 1955 - (ANCILLARIIDAE)
- urasima, Amalda hinomotoensis urasima T. Kira, 1955 - (ANCILLARIIDAE)
- Urazirochlamys, Genus Urazirochlamys Habe, 1946 (HELICARIONIDAE)
- urbajtisae, Praekolymia urbajtisae Biakov, 2008 † - (KOLYMIIDAE) (FOSSIL)
- urbana, Succinea urbana L.R. Hubricht, 1961 - (SUCCINEIDAE)
- urbani, Ancyloceras urbani (M. von Neumayr & Uhlig, 1881 †) - (ANCYLOCERATIDAE) (FOSSIL)
- urbani, Crioceras urbani M. von Neumayr & Uhlig, 1881 † - syn of: Ancyloceras urbani (M. von Neumayr & Uhlig, 1881 †) - (CRIOCERATITIDAE) (FOSSIL)
- urbanior, Maurea punctulata urbanior (H.J. Finlay, 1926) - (CALLIOSTOMATIDAE)
- urbannaensis, Carolinapecten urbannaensis (W.C. Mansfield, 1928 †) - (PECTINIDAE) (FOSSIL)
- urbannensis, Marvacrassatella urbannensis (W.C. Mansfield, 1929 †) - (CRASSATELLIDAE) (FOSSIL)
- urbanskii, Deroceras urbanskii A. Wiktor, 1971 - (AGRIOLIMACIDAE)
- urbanskii, Bulgarica urbanskii H. Nordsieck, 1973 - (CLAUSILIIDAE)
- urbanskii, Oxychilus urbanskii F. Riedel, 1963 - (OXYCHILIDAE)
- urbanskii paganella, Bulgarica urbanskii paganella H. Nordsieck, 1974 - (CLAUSILIIDAE)
- urbanum, Eutrephoceras urbanum (Sowerby, 1843 †) - (NAUTILIDAE) (FOSSIL)
- urbanum, Cyrtocycloceras urbanum (Barrande, 1866 †) - (PARAPHRAGMITIDAE) (FOSSIL)
- urbanus, Cantharidus urbanus (A.A. Gould, 1861) - (TROCHIDAE)
- urbiae, Arion urbiae A.J. de Winter, 1986 - (ARIONIDAE)
- urbinai, Eupleura urbinai DeVries, 2005 † - (MURICIDAE) (FOSSIL)
- Urbnisia, Genus Urbnisia Goncharova, 1981 † (CARDIIDA (UNASSIGNED)) (FOSSIL)
- urceola, Compsodrillia urceola W.P. Woodring, 1928 † - (PSEUDOMELATOMIDAE) (FOSSIL)
- Urceolabrum, Genus Urceolabrum Wade, 1916 † (PICKWORTHIIDAE) (FOSSIL)
- Urceolarica, Subgenus Cuvierina (Urceolarica) Janssen, 2006 † (CAVOLINIIDAE) (FOSSIL)
- urceolaris, Cuvierina urceolaris (O.A.L. Mörch, 1850) - (CUVIERINIDAE)
- urceolaris, Cuvierina urceolaris O.A.L. Mörch, 1850 - syn of: Cuvierina urceolaris (O.A.L. Mörch, 1850) - (CUVIERINIDAE)
- urceolata, Cancellaria urceolata R.B. Hinds, 1843 - (CANCELLARIIDAE)
- urceolata, Lymnaea urceolata A. Braun in Walchner, 1851 † - (LYMNAEIDAE) (FOSSIL)
- urceolata, Pyrgocythara urceolata E. Rolán & J. Otero-Schmidt, 1999 - (MANGELIIDAE)
- urceolata pseudopalustris, Lymnaea urceolata pseudopalustris A.V.M.D. D'Orbigny, 1852 † - (LYMNAEIDAE) (FOSSIL)
- urceolatus, Alloteuthis urceolatus A. Risso, 1854 - syn of: Alloteuthis media (C. Linnaeus, 1758) - (LOLIGINIDAE)
- Urceus, syn of: Genus Achatina J.B.P.A. Lamarck, 1799 (ACHATINIDAE)
- urceus, Pomacea urceus (O.F. Müller, 1774) - (AMPULLARIIDAE)
- Urceus, syn of: Subgenus Theodoxus (Clithon) P.D. Montfort, 1810 (NERITIDAE)
- urceus, Olivancillaria urceus (P.F. Röding, 1798) - (OLIVIDAE)
- urceus, Oliva urceus P.F. Röding, 1798 - syn of: Olivancillaria urceus (P.F. Röding, 1798) - (OLIVIDAE)
- urceus, Canarium urceus (C. Linnaeus, 1758) - (STROMBIDAE)
- urceus erythrostoma, Pomacea urceus erythrostoma L.A. Reeve, 1856 - (AMPULLARIIDAE)
- urceus guyanensis, Pomacea urceus guyanensis J.B.P.A. Lamarck, 1822 - syn of: Pomacea guyanensis (J.B.P.A. Lamarck, 1822) - (AMPULLARIIDAE)
- urceus incisum, Canarium urceus incisum (W. Wood, 1828) - (STROMBIDAE)
- urceus olivacea, Pomacea urceus olivacea (J.B. von Spix, 1827) - (AMPULLARIIDAE)
- urceus orrae, Canarium urceus orrae R.T. Abbott, 1960 - (STROMBIDAE)
- urceus ustulatus, Canarium urceus ustulatus (H.C.F. Schumacher, 1817) - (STROMBIDAE)
- urceus yatesii, Pomacea urceus yatesii (L.A. Reeve, 1856) - (AMPULLARIIDAE)
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