- urdambideli, Pradoxa urdambideli R. Houart & E. Rolán, 2012 - (MURICIDAE)
- urdatica, Falsoebala urdatica Grundel & al., 2007 † - (MURCHISONELLIDAE) (FOSSIL)
- urdeneta, Turbonilla urdeneta P. Bartsch, 1917 - (PYRAMIDELLIDAE)
- urdeneta, Obtusella urdeneta (P. Bartsch, 1917) - (RISSOIDAE)
- urdunensis, Aqabarella urdunensis Alhejoj, Bandel & Al-Najjar, 2016 - (AQABARELLIDAE)
- urdunensis, Cima urdunensis K. Bandel, 2005 - (CIMIDAE)
- urdunica, Ferrissia urdunica Alhejoj & K. Bandel, 2013 † - (PLANORBIDAE) (FOSSIL)
- urdunica, Vitrinella urdunica K. Bandel, 2010 - (TORNIDAE)
- Urdyceras, Genus Urdyceras Brayard & Bucher, 2008 † (GALFETTITIDAE) (FOSSIL)
- urei, Euphemites urei (Fleming, 1828 †) - (EUPHEMITIDAE) (FOSSIL)
- urei ardenensis, Euphemites urei ardenensis Weir, 1931 † - (EUPHEMITIDAE) (FOSSIL)
- urenuiensis, Ireneia urenuiensis (H.H. Suter, 1917 †) - (CUVIERINIDAE) (FOSSIL)
- uretai, Olivancillaria uretai M.A. Klappenbach, 1965 - syn of: Olivancillaria orbignyi (F.P. Marrat, 1868) - (OLIVIDAE)
- urfensis, Agoniatites urfensis Correns, 1923 † - syn of: Agoniatites evexus (von Buch, 1832 †) - (AGONIATITIDAE) (FOSSIL)
- Urftia, Genus Urftia Heidelberger & Bandel, 1999 † (PALAEOZYGOPLEURIDAE) (FOSSIL)
- urgelensis, Xerocrassa urgelensis P. Fagot, 1889 - syn of: Amandana salvanae (P. Fagot, 1886) - (HYGROMIIDAE)
- Urgonella, Genus Urgonella Cossmann, 1916 † (POTAMIDIDAE) (FOSSIL)
- urgonense, Tritonium urgonense Pictet & Campiche † - syn of: Cretaceomurex urgonense Pictet & Campiche † - (BUCCINIDAE) (FOSSIL)
- urgonense, Cretaceomurex urgonense Pictet & Campiche † - (SPINILOMATIDAE) (FOSSIL)
- urgonensis, Acteonina urgonensis (A.E.M. Cossmann, 1895 †) - (ACTEONINIDAE) (FOSSIL)
- urgonensis, Bulla urgonensis Pictet & Campiche, 1862 † - syn of: Cylichna urgonensis (Pictet & Campiche, 1862 †) - (BULLIDAE) (FOSSIL)
- urgonensis, Cylichna urgonensis (Pictet & Campiche, 1862 †) - (CYLICHNIDAE) (FOSSIL)
- urgonensis, Chlamys urgonensis De Loriol † - (PECTINIDAE) (FOSSIL)
- urgonensis, Prohinnites urgonensis De Loriol † - (PECTINIDAE) (FOSSIL)
- urgonensis, Pileolus urgonensis Pictet & Campiche, 1861 † - (PILEOLIDAE) (FOSSIL)
- urgonensis, Alvania urgonensis A.E.M. Cossmann, 1918 † - (RISSOIDAE) (FOSSIL)
- urgorii, Falcidens urgorii Señarís & García-Álvarez, 2016 - (CHAETODERMATIDAE)
- Urgorria, Genus Urgorria Ó. García-Álvarez & L. Salvini-Plawén, 2001 (RHOPALOMENIIDAE)
- urgorrii, Turbonilla urgorrii A. Peñas & E. Rolán, 2010 - (PYRAMIDELLIDAE)
- Urguessella, Genus Urguessella Bacci, 1943 (CANARIELLIDAE)
- Urguessella, syn of: Genus Halolimnohelix J. Germain, 1913 (HALOLIMNOHELICIDAE)
- urguessensis, Tayloria urguessensis H.B. Preston - (STREPTAXIDAE)
- urguessensis subangulata, Tayloria urguessensis subangulata Unknown - (STREPTAXIDAE)
- urgutensis, Laevozebrinus urgutensis (W. Kobelt, 1902) - (ENIDAE)
- urichi, Leptinaria urichi (E.A. Smith, 1896) - (SUBULINIDAE)
- Urichia, syn of: Subgenus Lucidella (Poenia) H. Adams & A. Adams, 1856 (HELICINIDAE)
- uriconiensis, Liospira uriconiensis Pitcher, 1939 † - (EOTOMARIIDAE) (FOSSIL)
- uriel, Angeloteuthis uriel H.G. Lang, 1928 † - (PASSALOTEUTHIDIDAE) (FOSSIL)
- urieli, Nodilittorina urieli H.E.J. Biggs, 1966 - syn of: Echinolittorina millegrana (R.A. Philippi, 1848) - (LITTORINIDAE)
- urieli, Littorina urieli H.E.J. Biggs, 1966 - syn of: Echinolittorina millegrana (R.A. Philippi, 1848) - (LITTORINIDAE)
- urii, Euphemites urii Fleming, 1828 † - syn of: Euphemites urei (Fleming, 1828 †) - (EUPHEMITIDAE) (FOSSIL)
- urinator, Pleurotomella urinator É.A.A. Locard, 1897 - syn of: Theta chariessa (R.B. Watson, 1881) - (RAPHITOMIDAE)
- urinator, Pisidium urinator S. Clessin, 1877 - syn of: Pisidium conventus S. Clessin, 1877 - (SPHAERIIDAE)
- urinator, Pleurotoma urinator É.A.A. Locard, 1897 - syn of: Theta chariessa (R.B. Watson, 1881) - (TURRIDAE)
- urinatoria, Ascitellina urinatoria H.H. Suter, 1911 - syn of: Elliptotellina urinatoria (H.H. Suter, 1911) - (PSAMMOBIIDAE)
- urinatoria, Elliptotellina urinatoria (H.H. Suter, 1911) - (TELLINIDAE)
- urinatoria, Tellina urinatoria H.H. Suter, 1911 - syn of: Elliptotellina urinatoria (H.H. Suter, 1911) - (TELLINIDAE)
- urioi, Krachia urioi A. Hallgass, 1985 - syn of: Krachia cylindrata (J.G. Jeffreys, 1885) - (CERITHIOPSIDAE)
- uritai, Clinopegma magnum uritai J.T. Kuroda, 1931 - (BUCCINIDAE)
- urkuticum, Phricodoceras urkuticum Geczy, 1959 † - (PHRICODOCERATIDAE) (FOSSIL)
- Urkutitoma, Genus Urkutitoma Szabo, 1984 † (ARCHAEOGASTROPODA (UNASSIGNED)) (FOSSIL)
- Urlocella, Genus Urlocella Gründel, 1998 † (TOFANELLIDAE) (FOSSIL)
- urmensis, Parapronorites urmensis Tchernow, 1907 † - syn of: Sakmarites vulgaris (Karpinsky, 1889 †) - (PRONORITIDAE) (FOSSIL)
- urmianus, Buliminus urmianus O. Böttger, 1898 - (ENIDAE)
- urmiensis, Helix urmiensis W. Kobelt, 1889 - syn of: Assyriella djulfensis (F. Dubois De Montpéreux, 1840) - (HELICIDAE)
- urna, Vasum urna P.F. Röding, 1798 - syn of: Vasum muricatum (I. von Born, 1778) - (TURBINELLIDAE)
- urniformis, Harpa urniformis G. Perry, 1811 - syn of: Harpa cabriti ventricosa J.B.P.A. Lamarck, 1816 - (HARPIDAE)
- Urnigenella, syn of: Genus Mesoginella C.F. Laseron, 1957 (MARGINELLIDAE)
- urnina, Cernuella urnina É.A.A. Locard, 1894 - syn of: Cernuella virgata (E.M. Da Costa, 1778) - (HYGROMIIDAE)
- urnula, Dioryx urnula (W.H. Benson, 1853) - (CYCLOPHORIDAE)
- urnula, Pleuromya urnula J. Marwick, 1953 † - (PLEUROMYIDAE) (FOSSIL)
- urnula, Daphnella urnula (L.A. Reeve, 1845) - (RAPHITOMIDAE)
- urnula, Wainuia urnula (L. Pfeiffer, 1855) - (RHYTIDIDAE)
- urnula nasuta, Wainuia urnula nasuta A.W.B. Powell, 1946 - syn of: Wainuia nasuta A.W.B. Powell, 1946 - (RHYTIDIDAE)
- UROCOPTIDAE Pilsbry, 1898 - Family (GASTROPODA-HETEROBRANCHIA [Subclass]-PULMONATA [Infraclass]-STYLOMMATOPHORA [Order]-ORTHALICOIDEA [Superfamily])
- Urocoptis, Genus Urocoptis H.H. Beck, 1837 (UROCOPTIDAE)
- Urocoptola, Subgenus Autocoptis (Urocoptola) W.J. Clench, 1935 (UROCOPTIDAE)
- UROCYCLIDAE Simroth, 1889 - Family (GASTROPODA-HETEROBRANCHIA [Subclass]-PULMONATA [Infraclass]-STYLOMMATOPHORA [Order]-HELICARIONOIDEA [Superfamily])
- Urocyclus, Genus Urocyclus J.E. Gray, 1864 (UROCYCLIDAE)
- Uromitra, Genus Uromitra Bellardi, 1887 † (COSTELLARIIDAE) (FOSSIL)
- Uromitra, syn of: Subgenus Vexillum (Costellaria) W.J. Swainson, 1840 (COSTELLARIIDAE)
- uropigimelana, Anadara uropigimelana (J.B.G.M. Bory De Saint-Vincent, 1827) - (ARCIDAE)
- Urosalpinx, Genus Urosalpinx W. Stimpson, 1865 (MURICIDAE)
- urosevici, Alinda biplicata urosevici (P.S. Pavlovic, 1912) - (CLAUSILIIDAE)
- urosevici, Pseudamnicola urosevici P.S. Pavlovic, 1931 † - (HYDROBIIDAE) (FOSSIL)
- Uroteuthis, Genus Uroteuthis H.A. Rehder, 1945 (LOLIGINIDAE)
- urquharti, Allodiscus urquharti H.H. Suter, 1894 - (CHAROPIDAE)
- urquisa, Catriona urquisa Er. Marcus, 1965 - (TRINCHESIIDAE)
- urraca, Bostrycapulus urraca R. Collin, 2005 - (CALYPTRAEIDAE)
- ursa, Alamirifica ursa L.R. Saul & R.L. Squires, 2003 † - (GASTROPODA INCERTAE SEDIS) (FOSSIL)
- ursabrunae, Gonatus ursabrunae K. Jefferts, 1985 - (GONATIDAE)
- ursana, Diozoptyxis ursana Saul & R.L. Squires, 1998 † - (DIOZOPTYXIDAE) (FOSSIL)
- ursaniense, Ethmocardium ursaniense H.D. Russell & Landes, 1937 † - (CARDIIDAE) (FOSSIL)
- ursaniensis, Corbula ursaniensis H.D. Russell & Landes, 1937 † - (CORBULIDAE) (FOSSIL)
- ursellus, Bistolida ursellus (J.F. Gmelin, 1791) - (CYPRAEIDAE)
- ursellus, Melicerona ursellus L.C. Kiener, 1843 - syn of: Melicerona listeri (J.E. Gray, 1824) - (CYPRAEIDAE)
- ursellus, Cypraea ursellus J.F. Gmelin, 1791 - syn of: Bistolida ursellus (J.F. Gmelin, 1791) - (CYPRAEIDAE)
- ursellus, Bistolida ursellus T. Iredale, 1939 - syn of: Bistolida kieneri depriesteri F.A. Schilder, 1933 - (CYPRAEIDAE)
- ursellus, Bistolida ursellus W.R. Steadman & B.C. Cotton, 1943 - syn of: Bistolida kieneri depriesteri F.A. Schilder, 1933 - (CYPRAEIDAE)
- ursellus amoeba, Bistolida ursellus amoeba F.A. Schilder & M. Schilder, 1938 - (CYPRAEIDAE)
- ursensis, Celtites ursensis Smith, 1932 † - syn of: Rudolftruempyiceras apostolicum (Smith, 1932 †) - (CELTITIDAE) (FOSSIL)
- ursensis, Proclydonautilus ursensis Smith, 1927 † - (CLYDONAUTILIDAE) (FOSSIL)
- ursensis, Mytilus ursensis Smith, 1927 † - (MYTILIDAE) (FOSSIL)
- ursensis, Eosteinmannites ursensis Tozer, 1994 † - (STEINMANNITIDAE) (FOSSIL)
- ursensis, Tropites ursensis Smith, 1927 † - (TROPITIDAE) (FOSSIL)
- ursidens, Leiodistichites ursidens Tozer, 1994 † - (DISTICHITIDAE) (FOSSIL)
- ursinum, Stemmatoceras ursinum Imlay, 1936 † - (STEPHANOCERATIDAE) (FOSSIL)
- ursinum, Dimorphotoceras ursinum Tozer, 1994 † - (TIBETITIDAE) (FOSSIL)
- ursipes, Spondylus ursipes S.S. Berry, 1959 - syn of: Spondylus leucacanthus W.J. Broderip, 1833 - (SPONDYLIDAE)
- Ursirivus, Genus Ursirivus Vokes, 1945 † (CORBULIDAE) (FOSSIL)
- ursula, Zafrona ursula (K.H.J. Thiele, 1925) - (COLUMBELLIDAE)
- ursula, Columbella ursula K.H.J. Thiele, 1925 - syn of: Zafrona ursula (K.H.J. Thiele, 1925) - (COLUMBELLIDAE)
- ursula, Gudeodiscus ursula B. Páll-Gergely & A. Hunyadi, 2013 - (PLECTOPYLIDAE)
- ursula, Turbonilla ursula K.H.J. Thiele, 1925 - (PYRAMIDELLIDAE)
- ursula, Pleurotomella ursula K.H.J. Thiele, 1925 - (RAPHITOMIDAE)
- ursulae, Sepia ursulae B.C. Cotton, 1929 - syn of: Sepia pharaonis C.G. Ehrenberg, 1831 - (SEPIIDAE)
- ursus, Anadara globosa ursus (M. Tanaka, 1959) - (ARCIDAE)
- urtasimense, Hemiliroceras urtasimense Shimanskiy, 1967 † - (LIROCERATIDAE) (FOSSIL)
- Urtasymoceras, Genus Urtasymoceras Zhuravleva, 1972 † (DISCOSORIDA (UNASSIGNED)) (FOSSIL)
- Urticicola, Genus Urticicola W.A. Lindholm, 1927 (HYGROMIIDAE)
- Urticicolini, Genus Urticicolini Neiber, Razkin & Hausdorf, 2017 (HYGROMIIDAE)
- uruapamensis, Volutaxis uruapamensis (H.A. Pilsbry, 1899) - (SPIRAXIDAE)
- urubambensis, Epiphragmophora diluta urubambensis H.A. Pilsbry, 1926 - (EPIPHRAGMOPHORIDAE)
- urueuauau, Mirachelus urueuauau R.S. Absalão, 2009 - (CHILODONTIDAE)
- uruguaya, Adelphotectonica uruguaya (A. Carcelles, 1953) - (ARCHITECTONICIDAE)
- uruguaya sunderlandi, Adelphotectonica uruguaya sunderlandi E.J. Petuch, 1987 - (ARCHITECTONICIDAE)
- uruguayana, Heleobia uruguayana (H.A. Pilsbry, 1924) - (COCHLIOPIDAE)
- uruguayanus, Bulimulus vesicalis uruguayanus H.A. Pilsbry, 1897 - (BULIMULIDAE)
- uruguayensis, Corbula uruguayensis W.B. Marshall, 1928 - (CORBULIDAE)
- uruguayensis, Crassatella uruguayensis E.A. Smith, 1880 - (CRASSATELLIDAE)
- uruguayensis, Anodontites patagonica uruguayensis (I. Lea, 1860) - (MYCETOPODIDAE)
- uruguayensis, Buccinanops uruguayensis (H.A. Pilsbry, 1897) - (NASSARIIDAE)
- uruguayensis, Nucula uruguayensis W.B. Marshall, 1928 - syn of: Nucula semiornata A.V.M.D. D'Orbigny, 1842 - (NUCULIDAE)
- uruguayensis, Nucula uruguayensis E.A. Smith, 1880 - syn of: Ennucula puelcha (A.V.M.D. D'Orbigny, 1842) - (NUCULIDAE)
- uruguayensis, Pholidoteuthis uruguayensis R. Leta, 1987 - (PHOLIDOTEUTHIDAE)
- uruguayensis, Turbonilla uruguayensis H.A. Pilsbry, 1897 - (PYRAMIDELLIDAE)
- uruguayensis, Abra uruguayensis (H.A. Pilsbry, 1897) - (SEMELIDAE)
- uruguayensis, Semele uruguayensis H.A. Pilsbry, 1897 - syn of: Abra uruguayensis (H.A. Pilsbry, 1897) - (SEMELIDAE)
- uruguayensis, Macoma uruguayensis (E.A. Smith, 1885) - (TELLINIDAE)
- uruguayensis, Unio uruguayensis I. Lea, 1860 - syn of: Diplodon wymanii (I. Lea, 1860) - (UNIONIDAE)
- uruma, Cardita uruma I. Hayami & T. Kase, 1993 - syn of: Cardita kyushuensis (T.A. Okutani, 1963) - (CARDITIDAE)
- urumacoensis, Caryocorbula urumacoensis F. Hodson & F. Hodson, 1931 † - (CORBULIDAE) (FOSSIL)
- urumaconis, Euvola urumaconis F. Hodson & al., 1927 † - (PECTINIDAE) (FOSSIL)
- Urumella, Genus Urumella I. Hayami & T. Kase, 1993 (MYTILIDAE)
- urumqiensis, Palaeomutela urumqiensis P. Wei † - (PALAEOMUTELIDAE) (FOSSIL)
- urupensis, Karaftohelix bocageana urupensis (H.A. Pilsbry, 1927) - (BRADYBAENIDAE)
- uruschtenka, Helix uruschtenka W.A. Lindholm, 1927 - syn of: Abchasohela christophori (O.W. Von Rosen, 1911) - (HELICIDAE)
- urutiensis, Purpurocardia urutiensis (J. Marwick, 1926 †) - (CARDITIDAE) (FOSSIL)
- urvillei, Torresitrachia urvillei F. Köhler, 2011 - (CAMAENIDAE)
- urvillei, Gymnoplax urvillei A. de Rochebrune, 1881 - syn of: Ischnochiton contractus (L.A. Reeve, 1847) - (CHITONIDAE)
- urvillei, Astralium urvillei R.A. Philippi, 1852 - syn of: Astralium tentoriiforme (I.H. Jonas, 1845) - (TURBINIDAE)
- usagi, Costasiella usagi M. Ichikawa, 1993 - (COSTASIELLIDAE)
- Usahaliotis, syn of: Genus Haliotis C. Linnaeus, 1758 (HALIOTIDAE)
- usambarense, Ptychotrema usambarense B. Verdcourt - (STREPTAXIDAE)
- usambarense, Atrichotoxon usambarense (B. Verdcourt, 1961) - (UROCYCLIDAE)
- usambarensis, Achatina usambarensis H. Rolle, 1895 - syn of: Achatina zanzibarica J.R. Bourguignat, 1879 - (ACHATINIDAE)
- usambarensis, Edentulina usambarensis J.C. Bequaert & W.J. Clench - (STREPTAXIDAE)
- usambarensis, Gonaxis usambarensis B. Verdcourt - (STREPTAXIDAE)
- usambarica, Achatina usambarica E.C. Von Martens, 1897 - syn of: Achatina zanzibarica J.R. Bourguignat, 1879 - (ACHATINIDAE)
- usambarica, Gulella usambarica A. Craven, 1880 - (STREPTAXIDAE)
- usambarica, Subulina usambarica L. Pfeiffer - (SUBULINIDAE)
- usambarica, Hypolysia usambarica B. Verdcourt - (SUBULINIDAE)
- usarpi, Dorymenia usarpi L. Salvini-Plawén, 1978 - (PRONEOMENIIDAE)
- Usatricolia, syn of: Genus Tricolia A. Risso, 1826 (PHASIANELLIDAE)
- uscarianum, Fissidentalium uscarianum A.A. Olsson, 1922 † - (DENTALIIDAE) (FOSSIL)
- uschakovi, Dallicordia uschakovi (G.P. Gorbunov, 1946) - (LYONSIELLIDAE)
- uschakovi, Oenopota uschakovi I.P. Bogdanov, 1985 - (MANGELIIDAE)
- uschakovi, Placiphorella uschakovi A.M. Jakovleva, 1952 - syn of: Placiphorella atlantica (A.E. Verrill & S. Smith in A.E. Verrill, 1882) - (MOPALIIDAE)
- uschakovi, Poroleda uschakovi (O.A. Scarlato, 1981) - (NUCULANIDAE)
- uschakovi, Nuculana uschakovi O.A. Scarlato, 1981 - syn of: Poroleda uschakovi (O.A. Scarlato, 1981) - (NUCULANIDAE)
- uschakovi, Parvamussium uschakovi O.A. Scarlato, 1960 - syn of: Parvamussium intuscostatum (M. Yokoyama, 1920) - (PROPEAMUSSIIDAE)
- Usedomella, Genus Usedomella Gründel, 1998 † (TOFANELLIDAE) (FOSSIL)
- uselmae, Argopecten uselmae H.A. Pilsbry & Johnson, 1917 † - (PECTINIDAE) (FOSSIL)
- usensis, Devonocheilus usensis P.A. Zhuravleva, 1972 † - syn of: Devonocheilus timanicus (Holzapfel, 1899 †) - (ARCHIACOCERATIDAE) (FOSSIL)
- ushakovi, Onchidiopsis ushakovi K.M. Derjugin, 1937 - (VELUTINIDAE)
- ushunensis, Gerstfeldtiancylus ushunensis A. Shirokaya, 2007 - (ACROLOXIDAE)
- usiacurii, Anadara usiacurii F.M. Anderson, 1929 † - (ARCIDAE) (FOSSIL)
- usiacurii, Tucetona usiacurii (Anderson, 1929 †) - (GLYCYMERIDIDAE) (FOSSIL)
- usiacurina, Lirophora usiacurina N.E. Weisbord, 1929 † - (VENERIDAE) (FOSSIL)
- Usilla, Subgenus Cronia (Usilla) H. Adams, 1860 (MURICIDAE)
- usitata, Paraphaedusa usitata (E.A. Smith, 1896) - (CLAUSILIIDAE)
- usitata, Antalis usitata (E.A. Smith, 1894) - (DENTALIIDAE)
- usitata, Herviera usitata C.F. Laseron, 1950 - syn of: Rissoina usitata (C.F. Laseron, 1950) - (PYRAMIDELLIDAE)
- usitata, Rissoina usitata (C.F. Laseron, 1950) - (RISSOINIDAE)
- usitata tjambensis, Paraphaedusa usitata tjambensis P. Ehrmann, 1949 - (CLAUSILIIDAE)
- usitatum, Chaetoderma usitatum A.H. Scheltema, 1989 - (CHAETODERMATIDAE)
- usitatum, Chuticeras usitatum P.A. Zhuravleva, 1972 † - syn of: Ukhtoceras uchtense (Holzapfel, 1899 †) - (DISCOSORIDA (unassigned)) (FOSSIL)
- usitatus, Stoliconus usitatus L.Y. Jiang, 1980 † - syn of: Ocruranus subpentaedrus H.X. Liu, 1979 † - (HALKIERIIDAE) (FOSSIL)
- usitatus, Sinuites usitatus Isakar, 1991 † - (SINUITIDAE) (FOSSIL)
- uskalykense, Umbetoceras uskalykense Ruzhentsev & Bogoslovskaya, 1971 † - (HOMOCERATIDAE) (FOSSIL)
- Uskardita, Genus Uskardita Ratter & Cope, 1998 † (FREJIDAE) (FOSSIL)
- uslonica, Mellopegma uslonica Parkhaev, 2004 † - (STENOTHECIDAE) (FOSSIL)
- usnea, Neritina usnea (P.F. Röding, 1798) - (NERITIDAE)
- usnea, Nerita usnea P.F. Röding, 1798 - syn of: Neritina usnea (P.F. Röding, 1798) - (NERITIDAE)
- usnea reclivata, Neritina usnea reclivata T. Say, 1822 - (NERITIDAE)
- usnea sphaera, Neritina usnea sphaera H.A. Pilsbry, 1931 - (NERITIDAE)
- usquamaris, Antillophos usquamaris K. Fraussen, 2005 - (NASSARIIDAE)
- Usseliceras, Genus Usseliceras Zeiss, 1968 † (AMMONITIDA (UNASSIGNED)) (FOSSIL)
- ussheri, Capulus ussheri Whidborne, 1891 † - syn of: Platyceras ussheri (Whidborne, 1891 †) - (CAPULIDAE) (FOSSIL)
- ussheri, Archoceras ussheri House, 1963 † - (GEPHUROCERATIDAE) (FOSSIL)
- ussheri, Littorina ussheri Whidborne, 1891 † - syn of: Turbonitella ussheri (Whidborne, 1891 †) - (LITTORINIDAE) (FOSSIL)
- ussheri, Turbonitella ussheri (Whidborne, 1891 †) - (NERITOPSIDAE) (FOSSIL)
- ussheri, Platyceras ussheri (Whidborne, 1891 †) - (PLATYCERATIDAE) (FOSSIL)
- ussi, Doto ussi J.A. Ortea, 1982 - (DOTIDAE)
- Ussuria, Genus Ussuria Diener , 1895 † (USSURIIDAE) (FOSSIL)
- Ussuriaspenites, Genus Ussuriaspenites Zakharov & Smyshlyaeva, 2013 † (ASPENITIDAE) (FOSSIL)
- ussurica, Gervillia ussurica Kiparisova, 1938 † - (MYALINIDAE) (FOSSIL)
- ussurica, Pteria ussurica Nakazawa † - (PTERIIDAE) (FOSSIL)
- ussuricus, Entolium ussuricus (Bittner 1899) † - (ENTOLIIDAE) (FOSSIL)
- Ussuridiscus, Genus Ussuridiscus Shigeta & Zakharov, 2009 † (GYRONITIDAE) (FOSSIL)
- ussuriense, Punctum ussuriense (I.M. Likharev & E.S. Rammelmeyer, 1952) - (PUNCTIDAE)
- ussuriensis, Acroloxus ussuriensis I.M. Moskvicheva, N.D. Kruglov & Y.I. Starobogatov, 1991 - (ACROLOXIDAE)
- ussuriensis, Japonactaeon nipponensis ussuriensis A. Chernyshev & E.M. Chaban, 2016 - (ACTEONIDAE)
- ussuriensis, Boreoelona ussuriensis (P. Ehrmann in F. Büttner & P. Ehrmann, 1927) - (BITHYNIIDAE)
- ussuriensis, Karaftohelix ussuriensis (C.A. Westerlund, 1897) - (BRADYBAENIDAE)
- ussuriensis, Palaeokazachstanites ussuriensis (Zakharov, 1968 †) - (FLEMINGITIDAE) (FOSSIL)
- ussuriensis, Palaeokazakhstanites ussuriensis Zakharov, 1968 † - syn of: Palaeokazachstanites ussuriensis (Zakharov, 1968 †) - (FLEMINGITIDAE) (FOSSIL)
- ussuriensis, Inoceramus ussuriensis Voronetz, 1937 † - (INOCERAMIDAE) (FOSSIL)
- ussuriensis, Lymnaea ussuriensis N.D. Kruglov & Y.I. Starobogatov, 1989 - (LYMNAEIDAE)
- ussuriensis, Dahurinaia ussuriensis V.V. Bogatov & al., 2003 - syn of: Margaritifera dahurica (A.T. von Middendorff, 1850) - (MARGARITIFERIDAE)
- ussuriensis, Mytiloceramus ussuriensis Voronetz, 1937 † - syn of: Inoceramus quenstedti Pcelincev, 1933 † - (PTERIIDA (unassigned)) (FOSSIL)
- ussuriensis, Anemina ussuriensis Z.X. Qian, Y. Fang & He, 2015 - (UNIONIDAE)
- ussuriensis, Lanceolaria ussuriensis I.M. Moskvicheva, 1973 - syn of: Lanceolaria cylindrica (C.T. Simpson, 1900) - (UNIONIDAE)
- ussuriensis, Cipangopaludina ussuriensis (P.M. Heude) - (VIVIPARIDAE)
- Ussuriflemingites, Genus Ussuriflemingites Shigeta & Zakharov, 2009 † (FLEMINGITIDAE) (FOSSIL)
- USSURIIDAE Spath, 1930 † - Family (CEPHALOPODA-AMMONOIDEA [Subclass]-CERATITIDA [Order]-MEEKOCERATOIDEA [Superfamily]) (FOSSIL)
- Ussurijuvenites, Genus Ussurijuvenites Smyshlyaeva & Zakharov, 2012 † (MELAGATHICERATIDAE) (FOSSIL)
- Ussuripisidium, syn of: Genus Pisidium L. Pfeiffer, 1821 (SPHAERIIDAE)
- Ussurites, Genus Ussurites Hyatt , 1900 † (USSURITIDAE) (FOSSIL)
- USSURITIDAE Hyatt, 1900 † - Family (CEPHALOPODA-AMMONOIDEA [Subclass]-PHYLLOCERATIDA [Order]-PHYLLOCERATOIDEA [Superfamily]) (FOSSIL)
- usta, Clathurella usta E.A. Smith, 1890 - syn of: Mitromorpha usta (E.A. Smith, 1890) - (CLATHURELLIDAE)
- usta, Mitromorpha usta (E.A. Smith, 1890) - (MITROMORPHIDAE)
- usta, Segmentina usta A.A. Gould, 1859 - (PLANORBIDAE)
- usta, Felaniella usta (A.A. Gould, 1861) - (UNGULINIDAE)
- usta swinhoei, Segmentina usta swinhoei A. Adams, 1866 - (PLANORBIDAE)
- usticensis, Mastus usticensis T.A. de M. Monterosato, 1892 - syn of: Jaminia pupa (C. Linnaeus, 1758) - (ENIDAE)
- usticensis, Eobania usticensis T.A. de M. Monterosato, 1892 - syn of: Eobania vermiculata (O.F. Müller, 1774) - (HELICIDAE)
- usticensis, Ichnusomunda usticensis (P. Calcara, 1842) - (HYGROMIIDAE)
- usticensis, Ischnochiton usticensis B. Dell'Angelo & L. Castriota, 1999 - (ISCHNOCHITONIDAE)
- ustickei, Conus ustickei J.P. Miller, 1959 - syn of: Attenuiconus attenuatus (L.A. Reeve, 1844) - (CONIDAE)
- ustickei, Fenimorea ustickei (G.W. Nowell-Usticke, 1959) - (DRILLIIDAE)
- ustickei, Drillia ustickei B. Hayes, 1959 - syn of: Drillia cydia (P. Bartsch, 1943) - (DRILLIIDAE)
- ustickei, Inodrillia ustickei B. Hayes, 1959 - syn of: Drillia cydia (P. Bartsch, 1943) - (HORAICLAVIDAE)
- ustjuriensis, Neovenerella ustjuriensis Goncharova 1986 † - (CARDIIDA (UNASSIGNED)) (FOSSIL)
- ustjurtensis, Clavatula ustjurtensis Ilyina, 1955 † - (CLAVATULIDAE) (FOSSIL)
- ustritskyi, Taimyrokolymia ustritskyi Biakov, 2008 † - (KOLYMIIDAE) (FOSSIL)
- ustritskyi, Andrianovia ustritskyi Borissenkov, 2004 † - (SOMOHOLITIDAE) (FOSSIL)
- Ustronia, Subgenus Calidviana (Ustronia) A. Wagner, 1908 (HELICINIDAE)
- Ustularca, syn of: Genus Barbatia J.E. Gray, 1847 (ARCIDAE)
- ustulata, Partulina ustulata Guick, 1856 - (ACHATINELLIDAE)
- ustulata, Achatinella ustulata W. Newcomb - syn of: Achatinellastrum vulpina colorata (L.A. Reeve, 1850) - (ACHATINELLIDAE)
- ustulata, Archachatina ustulata (J.B.P.A. Lamarck, 1822) - (ACHATINIDAE)
- ustulata, Cancellopollia ustulata G.J. Vermeij & P. Bouchet, 1998 - (BUCCINIDAE)
- ustulata, Etrema aliciae ustulata (J.L. Bouge & P. Dautzenberg, 1914) - (CLATHURELLIDAE)
- ustulata, Corbula ustulata L.A. Reeve, 1844 - syn of: Potamocorbula nimbosa (S.C.T. Hanley, 1843) - (CORBULIDAE)
- ustulata, Peristernia ustulata (L.A. Reeve, 1847) - (FASCIOLARIIDAE)
- ustulata, Theba ustulata R.T. Lowe, 1852 - syn of: Theba macandrewiana (L. Pfeiffer, 1833) - (HELICIDAE)
- ustulata, Mitra ustulata L.A. Reeve, 1844 - (MITRIDAE)
- ustulata, Mitromorpha ustulata R.N. Kilburn, 1986 - (MITROMORPHIDAE)
- ustulata, Polinices ustulata G.B. II Sowerby, 1883 - syn of: Conuber conicum (J.B.P.A. Lamarck, 1822) - (NATICIDAE)
- ustulata, Natica ustulata G.B. II Sowerby, 1883 - syn of: Conuber conicum (J.B.P.A. Lamarck, 1822) - (NATICIDAE)
- ustulata, Nerita ustulata G.B. Sowerby, 1883 - syn of: Theliostyla albicilla (C. Linnaeus, 1758) - (NERITIDAE)
- ustulata, Scutellastra ustulata L.A. Reeve, 1855 - syn of: Scutellastra peronii (H.M.D. de Blainville, 1825) - (PATELLIDAE)
- ustulata, Duplicaria ustulata (G.P. Deshayes, 1857) - (TEREBRIDAE)
- ustulata, Terebra ustulata G.P. Deshayes, 1857 - syn of: Duplicaria ustulata (G.P. Deshayes, 1857) - (TEREBRIDAE)
- ustulata, Coriophora ustulata (R.P.J. Hervier, 1898) - (TRIPHORIDAE)
- ustulata, Triphora ustulata R.P.J. Hervier, 1898 - syn of: Coriophora ustulata (R.P.J. Hervier, 1898) - (TRIPHORIDAE)
- ustulata, Cautor ustulata (R.P.J. Hervier, 1898) - syn of: Coriophora ustulata (R.P.J. Hervier, 1898) - (TRIPHORIDAE)
- ustulata, Turbinella ustulata L.A. Reeve, 1847 - syn of: Peristernia ustulata (L.A. Reeve, 1847) - (TURBINELLIDAE)
- ustulata, Lophiotoma abbreviata ustulata (L.A. Reeve, 1846) - (TURRIDAE)
- ustulata, Hysteroconcha ustulata L.A. Reeve, 1863 - syn of: Pitar citrinus (J.B.P.A. Lamarck, 1818) - (VENERIDAE)
- ustulata limitanea, Archachatina ustulata limitanea A.C. van Bruggen, 1984 - syn of: Archachatina limitanea A.C. van Bruggen, 1984 - (ACHATINIDAE)
- ustulata luchuana, Peristernia ustulata luchuana H.A. Pilsbry, 1901 - (FASCIOLARIIDAE)
- ustulata takatukayamaensis, Corbula ustulata takatukayamaensis Y. Ando, 1965 - syn of: Potamocorbula nimbosa (S.C.T. Hanley, 1843) - (CORBULIDAE)
- ustulatulina, Crepidula ustulatulina R. Collin, 2002 - (CALYPTRAEIDAE)
- ustulatus, Naesiotus ustulatus (G.B. I Sowerby, 1833) - (BULIMULIDAE)
- ustulatus, Conus ustulatus L.A. Reeve, 1844 - syn of: Pionoconus magus (C. Linnaeus, 1758) - (CONIDAE)
- ustulatus, Fusinus ustulatus L.A. Reeve, 1848 - syn of: Fusinus undulatus (J.F. Gmelin, 1791) - (FASCIOLARIIDAE)
- ustulatus, Littorina ustulatus J.B.P.A. Lamarck, 1822 - syn of: Littorina littorea (C. Linnaeus, 1758) - (LITTORINIDAE)
- ustulatus, Brachidontes ustulatus (J.B.P.A. Lamarck, 1819) - (MYTILIDAE)
- ustulatus, Spondylus ustulatus L.A. Reeve, 1856 - syn of: Spondylus tenuis K. Schreibers, 1793 - (SPONDYLIDAE)
- ustulatus, Canarium ustulatus H. Dodge, 1946 - syn of: Canarium urceus (C. Linnaeus, 1758) - (STROMBIDAE)
- ustulatus, Canarium urceus ustulatus (H.C.F. Schumacher, 1817) - (STROMBIDAE)
- ustulatus, Turbo ustulatus J.B.P.A. Lamarck, 1822 - syn of: Littorina littorea (C. Linnaeus, 1758) - (TURBINIDAE)
- ustulatus pallescens, Naesiotus ustulatus pallescens W.H. Dall & W.H. Ochsner, 1928 - (BULIMULIDAE)
- ustulatus phlegonis, Naesiotus ustulatus phlegonis W.H. Dall & W.H. Ochsner, 1928 - syn of: Naesiotus ustulatus (G.B. I Sowerby, 1833) - (BULIMULIDAE)
- ustum, Cerithium ustum J.B. Hombron & C.H. Jacquinot, 1852 - syn of: Cerithium coralium (L.C. Kiener, 1841) - (CERITHIIDAE)
- ustum, Clypeomorus ustum J.B. Hombron & C.H. Jacquinot, 1852 - syn of: Cerithium coralium (L.C. Kiener, 1841) - (CERITHIIDAE)
- usukanensis, Pleuropoma usukanensis (E.A. Smith, 1895) - (HELICINIDAE)
- usukanensis, Aphanoconia usukanensis (H.H. Godwin-Austen, 1889) - (HELICINIDAE)
- usumasintae, Psorula usumasintae (J.C.H. Crosse & P.H. Fischer, 1892) - (UNIONIDAE)
- usurpans, Lyrula usurpans F. d'A. Furtado, 1886 - syn of: Lyrula loweana (T.V. Wollaston, 1878) - (COCHLICELLIDAE)
- utahense, Neoglyphioceras utahense Miller & al., 1952 † - (GONIATITIDAE) (FOSSIL)
- utahense, Pachylyroceras utahense (Miller, Youngquist & C. Nielsen 1952 †) - (NEOGLYPHIOCERATIDAE) (FOSSIL)
- utahensis, Aviculopecten utahensis F.B. Meek, 1860 † - syn of: Entolioides utahensis (F.B. Meek, 1860 †) - (AVICULOPECTINIDAE) (FOSSIL)
- utahensis, Naticopsis utahensis Batten & A. Stokes, 1986 † - (DELPHINULOPSIDAE) (FOSSIL)
- utahensis, Gonyodiscus utahensis Mathews, 1929 † - syn of: Hemiprionites typus (L. Waagen, 1895 †) - (DISCIDAE) (FOSSIL)
- utahensis, Entolioides utahensis (F.B. Meek, 1860 †) - (ENTOLIOIDESIDAE) (FOSSIL)
- utahensis, Euomphalus utahensis J.W. Hall & R.P. Whitfield, 1877 † - (EUOMPHALIDAE) (FOSSIL)
- utahensis, Lima utahensis Stanton, 1893 † - (LIMIDAE) (FOSSIL)
- utahensis, Stagnicola utahensis R.E. Call, 1884 - (LYMNAEIDAE)
- utahensis, Galba utahensis F.C. Baker, 1911 - syn of: Stagnicola utahensis R.E. Call, 1884 - (LYMNAEIDAE)
- utahensis, Polyrhytis utahensis J.L. Chamberlin & D.T. Jones, 1929 - syn of: Stagnicola utahensis R.E. Call, 1884 - (LYMNAEIDAE)
- utahensis, Vaugonia utahensis Imlay, 1964 † - (MYOPHORELLIDAE) (FOSSIL)
- utahensis, Pecten utahensis F.B. Meek, 1860 † - syn of: Entolioides utahensis (F.B. Meek, 1860 †) - (PECTINIDAE) (FOSSIL)
- utahensis, Physella utahensis (W.J. Clench, 1925) - (PHYSIDAE)
- utahensis, Orthriochiton utahensis Vendrasco & Runnegar, 2004 † - (PREACANTHOCHITONIDAE) (FOSSIL)
- utahensis, Kashmirites utahensis Brayard & al., 2013 † - (PRIONITIDAE) (FOSSIL)
- utahensis, Valvata utahensis R.E. Call, 1884 - (VALVATIDAE)
- utahensis, Microconchus utahensis Zatoń & al., 2013 † - (VIRIATELLIDAE) (FOSSIL)
- utaithaniensis, Anauchen utaithaniensis S. Panha, 2002 - (HYPSELOSTOMATIDAE)
- utatsuensis, Sichuanobelus utatsuensis Iba & al., 2012 † - (SINOBELEMNITIDAE) (FOSSIL)
- utaturensis, Hercoglossa utaturensis F. Stoliczka, 1866 † - (HERCOGLOSSIDAE) (FOSSIL)
- Utaturiceras, Genus Utaturiceras Matsumoto & al., 2003 † (ACANTHOCERATIDAE) (FOSSIL)
- utchbasica, Adyshevitheca utchbasica Mambetov & Repina, 1979 † - (CALYPTOPTOMATIDA (UNASSIGNED)) (FOSSIL)
- utcholokense, Profulvia utcholokense Slodkewitsch, 1938 † - (CARDIIDA (UNASSIGNED)) (FOSSIL)
- utcholokense, Papyridea utcholokense Slodkewitsch, 1938 † - syn of: Profulvia utcholokense Slodkewitsch, 1938 † - (CARDIIDAE) (FOSSIL)
- utcholokensis, Cyclocardia utcholokensis (Slodkewitsch, 1938 †) - (CARDITIDAE) (FOSSIL)
- utcholokensis, Eucrassatella utcholokensis Krishtofovich, 1947 † - (CRASSATELLIDAE) (FOSSIL)
- utcholokensis, Glycymeris utcholokensis Ilyina, 1962 † - (GLYCYMERIDIDAE) (FOSSIL)
- utcholokensis, Limatula utcholokensis V.N. Sinelnikova, 1991 † - (LIMIDAE) (FOSSIL)
- utcholokensis, Plicacesta utcholokensis Ilyina, 1962 † - syn of: Acesta amaxensis M. Yokoyama, 1911 † - (LIMIDAE) (FOSSIL)
- utcholokensis, Modiolus utcholokensis Slodkewitsch, 1936 † - (MYTILIDAE) (FOSSIL)
- utcholokensis, Nuculana utcholokensis Ilyina, 1963 † - (NUCULANIDAE) (FOSSIL)
- utcholokensis, Delectopecten utcholokensis Krishtofovich, 1984 † - syn of: Pseudamussium peckhami W.M. Gabb, 1906 † - (PECTINIDAE) (FOSSIL)
- utcholokensis, Pholadomya utcholokensis V.N. Sinelnikova, 1991 † - (PHOLADOMYIDAE) (FOSSIL)
- utcholokensis, Thracia utcholokensis Ilyina, 1962 † - (THRACIIDAE) (FOSSIL)
- utcholokensis, Diplodonta utcholokensis Ilyina, 1991 † - syn of: Cycladicama ferruginata J. Makiyama, 1926 † - (UNGULINIDAE) (FOSSIL)
- utchurica, Aldanella utchurica Rozanov & al., 1969 † - syn of: Aldanella attleborensis (Shaler & Foerste, 1888 †) - (ALDANELLIDAE) (FOSSIL)
- utdigitulus, Careliopsis utdigitulus Peñas & Rolán, 2017 - (PYRAMIDELLIDAE)
- Utela, syn of: Genus Mutela J.A. Scopoli, 1777 (IRIDINIDAE)
- uter, Alocospira uter M. Harzhauser, 2014 † - (ANCILLARIIDAE) (FOSSIL)
- utgei, Volvarina utgei J. Espinosa & J.A. Ortea, 2012 - (MARGINELLIDAE)
- utii, Unio utii Fleming † - (UNIONIDAE) (FOSSIL)
- utilaensis, Pustulatirus utilaensis W.G. Lyons & M.A. Snyder, 2013 - (FASCIOLARIIDAE)
- utilensis, Lamellaxis mexicanus utilensis (H.A. Pilsbry, 1907) - (SUBULINIDAE)
- utillensis, Pseudoguppya utillensis (C.M.F. Ancey, 1886) - (EUCONULIDAE)
- utinensis, Anodonta utinensis H. Drouët, 1883 - syn of: Anodonta cygnea (C. Linnaeus, 1758) - (UNIONIDAE)
- utinomi, Stilifer utinomi T. Habe, 1951 - (EULIMIDAE)
- utinomii, Galeommella utinomii T. Habe, 1958 - (GALEOMMATIDAE)
- Utoceras, Genus Utoceras Ulrich, Foerste & Miller, 1943 † (PILOCERATIDAE) (FOSSIL)
- utoensis, Apiotrigonia utoensis Tashiro, 1972 † - (MEGATRIGONIIDAE) (FOSSIL)
- utopica, Amalda utopica T. Ninomiya, 1987 - (ANCILLARIIDAE)
- utopica aureocallosa, Amalda utopica aureocallosa T. Shikama & T. Oishi, 1977 - syn of: Amalda aureocallosa T. Shikama & T. Oishi, 1977 - (ANCILLARIIDAE)
- utopica parentalis, Baryspira utopica parentalis T. Shikama & T. Oishi, 1977 - syn of: Amalda parentalis T. Shikama & T. Oishi, 1977 - (ANCILLARIIDAE)
- utowana, Cerion utowana W.J. Clench, 1933 - (CERIONIDAE)
- utowana, Succinea utowana W.J. Clench - (SUCCINEIDAE)
- Utralvoherpia, Genus Utralvoherpia L. Salvini-Plawén, 1979 (AMPHIMENIIDAE)
- utravis, Vexillum utravis J.C. Melvill, 1925 - syn of: Vexillum curviliratum (G.B. III Sowerby, 1874) - (COSTELLARIIDAE)
- utricula, Loxacypraea utricula L. Dolin, 2015 † - (CYPRAEIDAE) (FOSSIL)
- Utriculastra, syn of: Genus Cylichnella W.M. Gabb, 1873 (CYLICHNIDAE)
- utriculata, Bulla utriculata É.A.A. Locard, 1886 - syn of: Roxania utriculus (G.B. Brocchi, 1814) - (BULLIDAE)
- utriculata, Cypraea utriculata (J.B.P.A. Lamarck, 1810 †) - (CYPRAEIDAE) (FOSSIL)
- utriculata, Roxania utriculata É.A.A. Locard, 1886 - syn of: Roxania utriculus (G.B. Brocchi, 1814) - (SCAPHANDRIDAE)
- utriculina, Ponentina utriculina É.A.A. Locard, 1899 - syn of: Ponentina subvirescens (J.C. Bellamy, 1839) - (HYGROMIIDAE)
- Utriculina, syn of: Genus Olivancillaria D'Orbigny, 1840 (OLIVIDAE)
- Utriculopsis, syn of: Genus Philine P. Ascanius, 1772 (PHILINIDAE)
- utriculosa, Anodonta utriculosa H. Drouët, 1883 - syn of: Anodonta cygnea (C. Linnaeus, 1758) - (UNIONIDAE)
- utriculus, Bulla utriculus G.B. Brocchi, 1814 - syn of: Roxania utriculus (G.B. Brocchi, 1814) - (BULLIDAE)
- utriculus, Bulla utriculus M. Hörnes, 1814 † - syn of: Sabatia callifera Boettger, 1906 † - (BULLIDAE) (FOSSIL)
- utriculus, Bythinella utriculus (A. Paladilhe, 1874) - (BYTHINELLIDAE)
- utriculus, Cerion utriculus K.T. Menke, 1829 - (CERIONIDAE)
- utriculus, Marshallopsis utriculus Cecalupo & Perugia, 2017 - (CERITHIOPSIDAE)
- utriculus, Anazola utriculus J.F. Gmelin, 1791 - syn of: Agaronia gibbosa (I. von Born, 1778) - (OLIVIDAE)
- Utriculus, syn of: Genus Retusa T. Brown, 1827 (RETUSIDAE)
- utriculus, Roxania utriculus (G.B. Brocchi, 1814) - (SCAPHANDRIDAE)
- utriculus, Opeas utriculus (P.M. Heude, 1885) - (SUBULINIDAE)
- utriculus, Teredo utriculus J.F. Gmelin, 1791 - (TEREDINIDAE)
- utriculus, Unio utriculus I. Lea, 1845 - syn of: Fusconaia masoni (T.A. Conrad, 1834) - (UNIONIDAE)
- utriculus, Macroceramus utriculus C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- utriculus oblonga, Bulla utriculus oblonga J.G. Jeffreys, 1867 - syn of: Roxania utriculus (G.B. Brocchi, 1814) - (BULLIDAE)
- utris, Berthellina utris J.A. Ortea, L. Moro & G.M. Caballer, 2014 - (PLEUROBRANCHIDAE)
- Utschamiella, Genus Utschamiella Kolesnikov, 1977 † (UTSCHAMIELLIDAE) (FOSSIL)
- UTSCHAMIELLIDAE Kolesnikov, 1977 † - Family (BIVALVIA-PALAEOHETERODONTA [Subclass]-TRIGONIIDA [Order]-PSEUDOCARDINIOIDEA [Superfamily]) (FOSSIL)
- Utterbachia, syn of: Subgenus Anodonta (Utterbackiana) L.S. Frierson, 1927 (UNIONIDAE)
- Utterbackia, syn of: Subgenus Anodonta (Utterbackiana) L.S. Frierson, 1927 (UNIONIDAE)
- Utterbackiana, Subgenus Anodonta (Utterbackiana) L.S. Frierson, 1927 (UNIONIDAE)
- uttingerianus, Aporrhais uttingerianus (A. Risso, 1826 †) - (APORRHAIDAE) (FOSSIL)
- uttingerianus, Chenopus uttingerianus A. Risso, 1826 † - syn of: Aporrhais uttingerianus (A. Risso, 1826 †) - (APORRHAIDAE) (FOSSIL)
- uttingerianus crassulosa, Chenopus uttingerianus crassulosa F. Sacco, 1893 † - syn of: Aporrhais uttingerianus (A. Risso, 1826 †) - (APORRHAIDAE) (FOSSIL)
- uttingerianus elegantissimus, Aporrhais uttingerianus elegantissimus P. Parenzan, 1970 † - (APORRHAIDAE) (FOSSIL)
- uttingerianus peraraneosa, Chenopus uttingerianus peraraneosa F. Sacco, 1893 † - syn of: Aporrhais uttingerianus (A. Risso, 1826 †) - (APORRHAIDAE) (FOSSIL)
- uttingerianus pesgallinae, Aporrhais uttingerianus pesgallinae K.H. Barnard, 1963 - syn of: Aporrhais pesgallinae K.H. Barnard, 1963 - (APORRHAIDAE)
- uttingerianus pliotransiens, Chenopus uttingerianus pliotransiens F. Sacco, 1893 † - syn of: Aporrhais uttingerianus (A. Risso, 1826 †) - (APORRHAIDAE) (FOSSIL)
- Uttleya, Genus Uttleya J. Marwick, 1934 (MURICIDAE)
- uttleyi, Eoturris uttleyi (H.H. Suter, 1917 †) - (CONOIDEA (UNASSIGNED)) (FOSSIL)
- uttleyi, Janupecten uttleyi (J. Marwick, 1924 †) - (PECTINIDAE) (FOSSIL)
- uttleyi, Marshallaria uttleyi (R.S. Allan, 1926 †) - (PTYCHATRACTIDAE) (FOSSIL)
- uttleyi, Dosina uttleyi (J. Marwick, 1927 †) - (VENERIDAE) (FOSSIL)
- utuana, Turbonilla utuana L.G. Hertlein & A.M. Strong, 1951 - (PYRAMIDELLIDAE)
- utukokense, Entolium utukokense Imlay, 1961 † - (ENTOLIIDAE) (FOSSIL)
- uturyotoensis, Euphaedusa fusaniana uturyotoensis J.T. Kuroda & M. Hukuda, 1944 - (CLAUSILIIDAE)
- uturyotoensis, Vertigo alpestris uturyotoensis J.T. Kuroda & M. Hukuda, 1944 - (VERTIGINIDAE)
- utvensis, Turricaspia utvensis (N.I. Andrusov, 1902 †) - (HYDROBIIDAE) (FOSSIL)
- uva, Pyruclia uva P.O. Jung & R.E. Petit, 1990 † - (CANCELLARIIDAE) (FOSSIL)
- uva, Cerion uva (C. Linnaeus, 1758) - (CERIONIDAE)
- uva, Doto uva Er. Marcus, 1955 - (DOTIDAE)
- uva, Litiopa uva Belanger in R.P. Lesson, 1831 - syn of: Litiopa melanostoma P.C.A.S.L. Rang, 1829 - (LITIOPIDAE)
- uva, Morula uva (P.F. Röding, 1798) - (MURICIDAE)
- uva, Rillya uva H. Nordsieck, 2002 - (STREPTAXIDAE)
- uva, Viviparus uva (Stefanescu, 1897 †) - (VIVIPARIDAE) (FOSSIL)
- uva bonairensis, Cerion uva bonairensis F.C. Baker, 1914 - (CERIONIDAE)
- uva desculptum, Cerion uva desculptum H.A. Pilsbry & E.G. Vanatta, 1896 - (CERIONIDAE)
- uva hatoensis, Cerion uva hatoensis H.B. Baker, 1924 - (CERIONIDAE)
- uva knipensis, Cerion uva knipensis F.C. Baker, 1914 - (CERIONIDAE)
- uva kralendijki, Cerion uva kralendijki H.B. Baker, 1924 - (CERIONIDAE)
- uvaldensis, Balconorbis uvaldensis R. Hershler & A.J. Longley, 1986 - (COCHLIOPIDAE)
- uvalievae, Aenigmomphiscola uvalievae N.D. Kruglov & Y.I. Starobogatov, 1981 - (LYMNAEIDAE)
- uvania, Columbella uvania P.L. Duclos, 1840 - syn of: Pyrene flava (J.G. Bruguière, 1789) - (COLUMBELLIDAE)
- Uvanilla, Genus Uvanilla J.E. Gray, 1850 (TURBINIDAE)
- uvasana, Crassatella uvasana T.A. Conrad, 1855 † - (CRASSATELLIDAE) (FOSSIL)
- uvasana, Helminthoglypta uvasana B. Roth & F.G. Hochberg, 1992 - (HELMINTHOGLYPTIDAE)
- uvasana, Semeloidea uvasana (R.E. Dickerson, 1915 †) - (LASAEIDAE) (FOSSIL)
- uvasana, Saccella uvasana (R.E. Dickerson, 1915 †) - (NUCULANIDAE) (FOSSIL)
- uvasana, Turritella uvasana T.A. Conrad, 1865 † - (TURRITELLIDAE) (FOSSIL)
- uvasana aedificata, Turritella uvasana aedificata Clark & J.W. Durham, 1946 - (TURRITELLIDAE)
- uvasana stewarti, Turritella uvasana stewarti Merriam, 1941 † - (TURRITELLIDAE) (FOSSIL)
- uvea, Caecum uvea M. Pizzini, B.K. Raines & A. Vannozzi, 2013 - (CAECIDAE)
- uveanum, Bittium uveanum J.C. Melvill & R. Standen, 1896 - syn of: Joculator uveanus (J.C. Melvill & R. Standen, 1896) - (CERITHIIDAE)
- uveanus, Joculator uveanus (J.C. Melvill & R. Standen, 1896) - (CERITHIOPSIDAE)
- uvidermis, Vitrinozonites latissimus uvidermis H.A. Pilsbry, 1890 - (ZONITIDAE)
- uvongoensis, Bistolida stolida uvongoensis W. Massier, 2004 - (CYPRAEIDAE)
- uvuchensis, Saccella uvuchensis V.N. Sinelnikova, 1991 † - (NUCULANIDAE) (FOSSIL)
- uvula, Ransoniella uvula L. Dolin, 2007 - syn of: Notadusta punctata (C. Linnaeus, 1771) - (CYPRAEIDAE)
- uvula, Primovula uvula C.N. Cate, 1978 - syn of: Cuspivolva cuspis (C.N. Cate, 1973) - (OVULIDAE)
- uvula, Gonospira uvula G.P. Deshayes, 1863 - (STREPTAXIDAE)
- uvulifera, Daedalochila uvulifera R.J. Shuttleworth, 1852 - (POLYGYRIDAE)
- uvulifera bicornuta, Daedalochila uvulifera bicornuta H.A. Pilsbry, 1900 - (POLYGYRIDAE)
- uvulifera striata, Daedalochila uvulifera striata H.A. Pilsbry, 1940 - (POLYGYRIDAE)
- uvutschensis, Cyclocardia uvutschensis (Ilyina, 1963 †) - (CARDITIDAE) (FOSSIL)
- uvutschensis, Yoldia uvutschensis L. Krishtofovich, 1984 † - (YOLDIIDAE) (FOSSIL)
- uwadokoi, Acrilla uwadokoi Y. Otuka, 1943 † - (EPITONIIDAE) (FOSSIL)
- uwadokoi, Limopsis uwadokoi K. Oyama, 1951 - (LIMOPSIDAE)
- uwadokoi iturupica, Limopsis uwadokoi iturupica O.A. Scarlato, 1981 - syn of: Limopsis uwadokoi K. Oyama, 1951 - (LIMOPSIDAE)
- uwaensis, Hawaiarca uwaensis (M. Yokoyama, 1928) - (ARCIDAE)
- uwajimensis, Inoceramus uwajimensis Yehara, 1924 † - syn of: Mytiloides stantoni yeharai T. Nagao & E. Matsumoto, 1939 † - (INOCERAMIDAE) (FOSSIL)
- uwasoensis, Neptunea uwasoensis (Y. Otuka, 1935 †) - (BUCCINIDAE) (FOSSIL)
- uwinensis, Amplirhagada uwinensis F. Köhler, 2010 - (CAMAENIDAE)
- uwinsensis, Globorhagada uwinsensis F. Köhler, 2011 - (CAMAENIDAE)
- uwinsensis, Amplirhagada uwinsensis F. Köhler, 2010 - (CAMAENIDAE)
- Uxia, syn of: Genus Unitas K.V.W. Palmer, 1947 (CANCELLARIIDAE)
- uxorispalmeri, Barbatia uxorispalmeri H.B. Stenzel & E. Krause, 1957 † - (ARCIDAE) (FOSSIL)
- uyemurai, Ciliatocardium uyemurai (K. Kanehara, 1937 †) - (CARDIIDAE) (FOSSIL)
- uyii, Loliolus uyii (Wakiya & M. Ishikawa, 1921) - (LOLIGINIDAE)
- uyii, Loligo uyii (Wakiya & M. Ishikawa, 1921) - syn of: Loliolus uyii (Wakiya & M. Ishikawa, 1921) - (LOLIGINIDAE)
- Uzamakiella, Genus Uzamakiella T. Habe, 1958 † (OLIVIDAE) (FOSSIL)
- uzenensis, Diplommatina uzenensis H.A. Pilsbry, 1900 - (DIPLOMMATINIDAE)
- uzenensis, Waldemaria japonica uzenensis (H.A. Pilsbry, 1903) - (HELICINIDAE)
- uzenensis, Mya uzenensis S. Nomura & N. Zinbo, 1937 - syn of: Mya pseudoarenaria H.A. Schlesch, 1931 - (MYIDAE)
- uzenensis, Mya uzenensis S. Nomura & N. Zinbo, 1937 - syn of: Mya pseudoarenaria H.A. Schlesch, 1931 - (MYIDAE)
- uzenensis cassa, Diplommatina uzenensis cassa H.A. Pilsbry, 1901 - (DIPLOMMATINIDAE)
- uzense, Eutrephoceras uzense Shimansky, 1975 † - (NAUTILIDAE) (FOSSIL)
- uziellei, Placida viridis uziellei S. Trinchese, 1879 - (LIMAPONTIIDAE)
- uzielliana, Bithynia uzielliana A. Issel, 1866 - syn of: Gangetia uzielliana (A. Issel, 1866) - (BITHYNIIDAE)
- uzielliana, Ambigua signata uzielliana (M. Paulucci, 1881) - (HELICIDAE)
- uzielliana, Strigatella uzielliana J.C.H. Crosse, 1861 - syn of: Strigatella pellisserpentis L.A. Reeve, 1844 - (MITRIDAE)
- uzielliana, Gangetia uzielliana (A. Issel, 1866) - (STENOTHYRIDAE)
- uziellii, Ercolania uziellii S. Trinchese, 1872 - syn of: Ercolania viridis (A. da Costa, 1866) - (LIMAPONTIIDAE)
- uziellii, Oxychilus uziellii A. Issel, 1872 - (OXYCHILIDAE)
- Uzita, syn of: Genus Tritia Risso, 1826 (NASSARIIDAE) (FOSSIL)
- Uzumakiella, Genus Uzumakiella T. Habe, 1958 (TORNIDAE)
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