- thlipsa, Theba thlipsa C.A. Westerlund, 1889 - syn of: Theba subdentata helicella W. Wood, 1828 - (HELICIDAE)
- Thliptodon, Genus Thliptodon J.E.V. Boas, 1886 (CLIONIDAE)
- Thoanteus, Subgenus Zebrina (Thoanteus) W.A. Lindholm, 1925 (ENIDAE)
- thoas, Cerithium thoas White, 1887 † - (CERITHIIDAE) (FOSSIL)
- thola, Tomopleura thola (C.F. Laseron, 1954) - (BORSONIIDAE)
- thola, Crassitoniella thola (W.F. Ponder, 1965) - (EATONIELLIDAE)
- Tholachatina, Subgenus Archachatina (Tholachatina) J.C. Bequaert, 1950 (ACHATINIDAE)
- Tholapex, syn of: Genus Firoloida C.A. Lesueur, 1817 (PTEROTRACHEIDAE)
- tholia, Dendropoma tholia A.M. Keen & J.E. Morton, 1960 - (VERMETIDAE)
- tholiata, Cosa tholiata P.G. Oliver & A.M. Holmes, 2004 - (PHILOBRYIDAE)
- tholiculus, Amalda tholiculus (J. Marwick, 1931 †) - (ANCILLARIIDAE) (FOSSIL)
- tholicus, Baryspira tholicus J. Marwick, 1931 † - syn of: Amalda tholiculus (J. Marwick, 1931 †) - (ANCILLARIIDAE) (FOSSIL)
- tholiformis, Monachoides tholiformis J.R. Bourguignat - syn of: Perforatella incarnata (O.F. Müller, 1774) - (HYGROMIIDAE)
- tholispira, Ongleya tholispira Finlay & J. Marwick, 1937 † - (ACTEONIDAE) (FOSSIL)
- Tholitoma, Subgenus Cosmasyrinx (Tholitoma) Stilwell & al., 2004 † (TURRIDAE) (FOSSIL)
- tholloni, Mutela tholloni A. de Rochebrune, 1886 - syn of: Mutela legumen (A. de Rochebrune, 1886) - (IRIDINIDAE)
- tholoides, Kryptos tholoides (R.B. Watson, 1882) - (BUCCINIDAE)
- tholoides, Phenacohelix tholoides (H.H. Suter, 1907) - (CHAROPIDAE)
- tholoides, Therasia tholoides H.H. Suter, 1907 - syn of: Phenacohelix tholoides (H.H. Suter, 1907) - (CHAROPIDAE)
- tholoides, Clionella tholoides R.B. Watson, 1882 - syn of: Kryptos tholoides (R.B. Watson, 1882) - (CLAVATULIDAE)
- tholoides, Clathrodrillia tholoides R.B. Watson, 1882 - syn of: Kryptos tholoides (R.B. Watson, 1882) - (DRILLIIDAE)
- tholoides, Fusus tholoides R. Tate, 1888 † - (FASCIOLARIIDAE) (FOSSIL)
- tholoides, Taranis tholoides R.B. Watson, 1882 - syn of: Kryptos tholoides (R.B. Watson, 1882) - (RAPHITOMIDAE)
- tholoides, Pleurotoma tholoides R.B. Watson, 1882 - syn of: Kryptos tholoides (R.B. Watson, 1882) - (TURRIDAE)
- tholos, Drillia tholos K.H. Barnard, 1958 - (DRILLIIDAE)
- tholosa, Pseudamnicola tholosa E. Jekelius, 1944 † - (HYDROBIIDAE) (FOSSIL)
- Tholostoma, Genus Tholostoma C.F. Laseron, 1958 (TORNIDAE)
- tholus, Polygyra tholus W.G. Binney, 1857 - (POLYGYRIDAE)
- tholus, Climacia tholus H.A. Pilsbry & J.T.L. McGinty, 1946 - syn of: Anticlimax pilsbryi (J.T.L. McGinty, 1945) - (TORNIDAE)
- tholussum, Zospeum tholussum A. Weigand, 2013 - (ELLOBIIDAE)
- thomae, Bursa thomae D'Orbigny, 1842 - syn of: Bursa rhodostoma thomae (A.V.M.D. D'Orbigny, 1847) - (BURSIDAE)
- thomae, Bursa rhodostoma thomae (A.V.M.D. D'Orbigny, 1847) - (BURSIDAE)
- thomae, Thalassiconus thomae (J.F. Gmelin, 1791) - (CONIDAE)
- thomae, Ranella thomae D'Orbigny, 1842 - syn of: Bursa rhodostoma (G.B. II Sowerby, 1835) - (RANELLIDAE)
- thomaeana, Palaeotachea thomaeana H. Nordsieck, 2014 † - (HELICIDAE) (FOSSIL)
- thomaei, Radix subovata thomaei (A.E. Reuss, 1849 †) - (LYMNAEIDAE) (FOSSIL)
- thomasensis, Anadara thomasensis W.P. Woodring, 1925 † - (ARCIDAE) (FOSSIL)
- thomasi, Mesobeloceras thomasi Glenister, 1958 † - (BELOCERATIDAE) (FOSSIL)
- thomasi, Monostiolum thomasi A.A. Olsson, 1967 † - (BUCCINIDAE) (FOSSIL)
- thomasi, Conus thomasi G.B. III Sowerby, 1881 † - syn of: Virgiconus terebra thomasi (G.B. III Sowerby, 1881 †) - (CONIDAE) (FOSSIL)
- thomasi, Virgiconus terebra thomasi (G.B. III Sowerby, 1881 †) - (CONIDAE) (FOSSIL)
- thomasi, Erosaria thomasi (J.C.H. Crosse, 1865) - (CYPRAEIDAE)
- thomasi, Megalocypraea thomasi (A.A. Olsson, 1930 †) - (CYPRAEIDAE) (FOSSIL)
- thomasi, Cypraea thomasi J.C.H. Crosse, 1865 - syn of: Erosaria thomasi (J.C.H. Crosse, 1865) - (CYPRAEIDAE)
- thomasi, Gisortia thomasi A.A. Olsson, 1930 † - syn of: Megalocypraea thomasi (A.A. Olsson, 1930 †) - (CYPRAEIDAE) (FOSSIL)
- thomasi, Corbicula thomasi P.M. Pallary, 1901 - syn of: Corbicula fluminalis (O.F. Müller, 1774) - (CYRENIDAE)
- thomasi, Ellesmeroceras thomasi Ulrich & al., 1944 † - (ELLESMEROCERATIDAE) (FOSSIL)
- thomasi, Paraglauconia thomasi Mennessier, 1984 † - (EULIMIDAE) (FOSSIL)
- thomasi, Emarginula thomasi J.C.H. Crosse, 1864 - (FISSURELLIDAE)
- thomasi, Panopea thomasi H.F.A. von Ihering, 1914 † - (HIATELLIDAE) (FOSSIL)
- thomasi, Ischnochiton thomasi (W.T. Bednall, 1897) - (ISCHNOCHITONIDAE)
- thomasi, Haploplax thomasi W.T. Bednall, 1897 - syn of: Ischnochiton thomasi (W.T. Bednall, 1897) - (ISCHNOCHITONIDAE)
- thomasi, Cyanoplax thomasi (H.A. Pilsbry, 1898) - (LEPIDOCHITONIDAE)
- thomasi, Coelogasteroceras thomasi Miller & Cline, 1934 † - (LIROCERATIDAE) (FOSSIL)
- thomasi, Yochelsonospira thomasi (Elias, 1958 †) - (LOPHOSPIRIDAE) (FOSSIL)
- thomasi, Kayoceras thomasi Foerste, 1934 † - (LOWOCERATIDAE) (FOSSIL)
- thomasi, Melanopsis thomasi J.R. Tournouër, 1877 † - (MELANOPSIDAE) (FOSSIL)
- thomasi, Chicoreus thomasi (J.C.H. Crosse, 1872) - (MURICIDAE)
- thomasi, Murex thomasi J.C.H. Crosse, 1872 - syn of: Chicoreus thomasi (J.C.H. Crosse, 1872) - (MURICIDAE)
- thomasi, Polidevcia thomasi Dickins, 1956 † - (NUCULANIDAE) (FOSSIL)
- thomasi, Oliva nitidula thomasi J.C.H. Crosse, 1861 - (OLIVIDAE)
- thomasi, Ostrea thomasi R.A. Mclean, 1941 - syn of: Hyotissa mcgintyi (H.W. Harry, 1985) - (OSTREIDAE)
- thomasi, Chlamys thomasi G.B. Sowerby, 1897 - syn of: Austrochlamys natans (R.A. Philippi, 1845) - (PECTINIDAE)
- thomasi, Tudorata thomasi G.A. Solem, 1961 - (POMATIIDAE)
- thomasi, Wayampia thomasi (L. Pfeiffer, 1854) - (SCOLODONTIDAE)
- thomasi, Tissotia thomasi F. Péron, 1896 † - (TISSOTIIDAE) (FOSSIL)
- thomasi, Vitrinella thomasi H.A. Pilsbry, 1945 - (TORNIDAE)
- thomasi, Umbonium thomasi (J.C.H. Crosse, 1863) - (TROCHIDAE)
- thomasi, Clanculus thomasi J.C.H. Crosse, 1862 - (TROCHIDAE)
- thomasi philmarti, Erosaria thomasi philmarti G.T. Poppe, 1993 - (CYPRAEIDAE)
- thomasiae, Cerithium thomasiae G.B. II Sowerby, 1865 - syn of: Cerithium lutosum K.T. Menke, 1828 - (CERITHIIDAE)
- thomasiae, Stilifer thomasiae G.B. Sowerby, 1878 - syn of: Scalenostoma subulatum thomasiae (G.B. Sowerby, 1878) - (EULIMIDAE)
- thomasiae, Scalenostoma subulatum thomasiae (G.B. Sowerby, 1878) - (EULIMIDAE)
- thomasiana, Cancellaria thomasiana J.C.H. Crosse, 1861 - (CANCELLARIIDAE)
- thomasiana, Charpentieria dyodon thomasiana (H.C. Küster, 1850) - (CLAUSILIIDAE)
- thomasiana, Rapana thomasiana J.C.H. Crosse, 1861 - syn of: Rapana venosa (A. Valenciennes, 1846) - (MURICIDAE)
- thomasii, Astarte thomasii T.A. Conrad, 1855 † - (ASTARTIDAE) (FOSSIL)
- thomasinae, Monacha thomasinae E. Caziot, 1910 - syn of: Eutheba cantiana (G. Montagu, 1803) - (HYGROMIIDAE)
- Thomasites, Genus Thomasites Pervinquiére , 1907 † (PSEUDOTISSOTIIDAE) (FOSSIL)
- thomasseti, Glabrennea thomasseti (E.R. Sykes, 1909) - (STREPTAXIDAE)
- thomassini, Ancilla thomassini R.N. Kilburn, 1981 - (ANCILLARIIDAE)
- thomassini, Vasticardium thomassini E. Vidal, 1998 - (CARDIIDAE)
- thomassini, Aspella thomassini R. Houart, 1985 - (MURICIDAE)
- thomassini, Protocuspidaria thomassini J. Poutiers, 1984 - (PROTOCUSPIDARIIDAE)
- thomassini, Pulsellum thomassini V. Scarabino, 1995 - (PULSELLIDAE)
- thomassini, Venus thomassini E. Fischer-Piette & D. Vukadinovic, 1977 - (VENERIDAE)
- Thomea, Subgenus Pyrgina (Thomea) A.A.A. Girard, 1893 (SUBULINIDAE)
- thomei, Ketosia thomei F.N. Dos Santos & R.S. Absalão, 2006 - (BARLEEIIDAE)
- thomei, Radiodiscus thomei W.K. Weyrauch, 1965 - (HELICODISCIDAE)
- thomei, Kashmirites thomei Mathews, 1929 † - syn of: Wasatchites perrini Mathews, 1929 † - (PRIONITIDAE) (FOSSIL)
- thomei, Rhinus thomei W.K. Weyrauch, 1967 - (SIMPULOPSIDAE)
- thomeli, Audouliceras thomeli (C.E. Murphy, 1975 †) - (ANCYLOCERATIDAE) (FOSSIL)
- thomeli, Sarkariceras thomeli J.J. Vermeulen, 2006 † - (ANCYLOCERATIDAE) (FOSSIL)
- thomeli, Pachyhemihoplites thomeli Delanoy, 1992 † - (HEMIHOPLITIDAE) (FOSSIL)
- Thomelites, Genus Thomelites Meister & al., 1994 † (ACANTHOCERATIDAE) (FOSSIL)
- thomensis, Cerithiopsis thomensis J.R. le B. Tomlin, 1929 - syn of: Metaxia metaxa (S. Delle Chiaje, 1828) - (CERITHIOPSIDAE)
- thomensis, Gibberula thomensis (J.R. le B. Tomlin, 1919) - (CYSTISCIDAE)
- thomensis, Persicula thomensis J.R. le B. Tomlin, 1919 - syn of: Gibberula thomensis (J.R. le B. Tomlin, 1919) - (CYSTISCIDAE)
- thomensis, Pradoxa thomensis (F. Fernandes & E. Rolán, 1990) - (MURICIDAE)
- thomensis, Syrnola thomensis J.R. le B. Tomlin & L.J. Shackleford, 1915 - (PYRAMIDELLIDAE)
- thomensis, Manzonia thomensis E. Rolán & C. Fernández, 1990 - (RISSOIDAE)
- thomensis, Pseudoglessula fuscidula thomensis J. Germain, 1916 - (SUBULINIDAE)
- thomensis, Thyrophorella thomensis P.M. Pallary, 1911 - (THYROPHORELLIDAE)
- thomensis, Metaxia thomensis J.R. le B. Tomlin, 1929 - (TRIPHORIDAE)
- thomensis, Clanculus pseudocorallinus thomensis Ilídio & V. Félix-Alves, 1991 - (TROCHIDAE)
- thomensis, Thapsia thomensis (H.W.L. Dorhn) - (UROCYCLIDAE)
- Thomeomaizania, Genus Thomeomaizania J.C. Bequaert & W.J. Clench, 1936 (MAIZANIIDAE)
- Thomeonanina, syn of: Genus Rhysotina C.M.F. Ancey, 1887 (UROCYCLIDAE)
- thomi, Baculites thomi Reeside, 1927 † - (BACULITIDAE) (FOSSIL)
- thomi, Plesiovascoceras thomi (Reeside, 1923 †) - (VASCOCERATIDAE) (FOSSIL)
- thompsonense, Watinoceras thompsonense Cobban, 1988 † - (ACANTHOCERATIDAE) (FOSSIL)
- thompsoni, Akera thompsoni A.A. Olsson & J.T.L. McGinty, 1951 - syn of: Akera bayeri Er. Marcus & Ev. Marcus, 1967 - (AKERIDAE)
- thompsoni, Eogymnotoceras thompsoni Bucher, 1988 † - (CERATITIDAE) (FOSSIL)
- thompsoni, Strophiops thompsoni C.J. Maynard & W.F. Clapp, 1915 - (CERIONIDAE)
- thompsoni, Charopa thompsoni C.M.D.E. Legrand, 1871 - syn of: Thryasona diemenensis (J.C. Cox, 1868) - (CHAROPIDAE)
- thompsoni, Chromodoris thompsoni W.B. Rudman, 1983 - (CHROMODORIDIDAE)
- thompsoni, Cyclonenia thompsoni H. Nordsieck, Nuebrick & F.G. Thompson, 2003 - (CLAUSILIIDAE)
- thompsoni, Pyrgophorus thompsoni Wesselingh, 2006 † - (COCHLIOPIDAE) (FOSSIL)
- thompsoni, Protexanites thompsoni Jones, 1966 † - (COLLIGNONICERATIDAE) (FOSSIL)
- thompsoni, Colpodaspis thompsoni (G.H. Brown, 1979) - (COLPODASPIDIDAE)
- thompsoni, Loy thompsoni (S.V. Millen & J.W. Nybakken, 1991) - (CORAMBIDAE)
- thompsoni, Cyrtogomphoceras thompsoni Foerste, 1928 † - (CYRTOGOMPHOCERATIDAE) (FOSSIL)
- thompsoni, Zugodactylites thompsoni Howarth, 1978 † - (DACTYLIOCERATIDAE) (FOSSIL)
- thompsoni, Diplommatina thompsoni H.H. Godwin-Austen, 1892 - (DIPLOMMATINIDAE)
- thompsoni, Fusinus thompsoni R. Hadorn & B. Rogers, 2000 - (FASCIOLARIIDAE)
- thompsoni, Cuthona thompsoni F.J. García, P.J. Lopez-Gonzalez & J.C. García-Gómez, 1991 - (FIONIDAE)
- thompsoni, Glaucus thompsoni Churchill, Valdés & D. Ó Foighil, 2014 - (GLAUCIDAE)
- thompsoni, Leioceras thompsoni (Buckman, 1899 †) - (GRAPHOCERATIDAE) (FOSSIL)
- thompsoni, Helix thompsoni C.M.D.E. Legrand, 1871 - syn of: Thryasona diemenensis (J.C. Cox, 1868) - (HELICIDAE)
- thompsoni, Humboldtiana thompsoni K. Mejia, E. Naranjo-Garcia & O.J. Polaco, 2006 - (HUMBOLDTIANIDAE)
- thompsoni, Pyrgulopsis thompsoni R. Hershler, 1988 - (HYDROBIIDAE)
- thompsoni, Maclurites thompsoni Webers & al., 1992 † - syn of: Scaevogyra thompsoni (Webers & al., 1992 †) - (MACLURITIDAE) (FOSSIL)
- thompsoni, Kara thompsoni (L. Pfeiffer, 1845) - (MEGASPIRIDAE)
- thompsoni, Siratus thompsoni (H.R. Bullis, 1964) - (MURICIDAE)
- thompsoni, Eupleura thompsoni W.P. Woodring, 1959 † - (MURICIDAE) (FOSSIL)
- thompsoni, Nuculana thompsoni Cox, 1965 † - (NUCULANIDAE) (FOSSIL)
- thompsoni, Phestia thompsoni (Reed, 1932 †) - (NUCULANIDAE) (FOSSIL)
- thompsoni, Olivella thompsoni A.A. Olsson, 1956 - (OLIVELLIDAE)
- thompsoni, Beloitoceras thompsoni (Miller, Youngquist & Collinson, 1954 †) - (ONCOCERATIDAE) (FOSSIL)
- thompsoni, Cyrtoceras thompsoni Miller, 1894 † - syn of: Fayettoceras thompsoni (Miller, 1894 †) - (ONCOCERIDA (unassigned)) (FOSSIL)
- thompsoni, Scaevogyra thompsoni (Webers & al., 1992 †) - (ONYCHOCHILIDAE) (FOSSIL)
- thompsoni, Donaldospira thompsoni J. Donald, 1895 † - syn of: Murchisonia angulata marginata Lotz, 1900 † - (ORTHONEMIDAE) (FOSSIL)
- thompsoni, Chlamys thompsoni Stoyanow, 1949 † - (PECTINIDAE) (FOSSIL)
- thompsoni, Leptopecten thompsoni (C.J. Maury, 1917 †) - (PECTINIDAE) (FOSSIL)
- thompsoni, Pecten thompsoni C.J. Maury, 1917 † - syn of: Leptopecten thompsoni (C.J. Maury, 1917 †) - (PECTINIDAE) (FOSSIL)
- thompsoni, Elysia thompsoni K.R. Jensen, 1993 - (PLAKOBRANCHIDAE)
- thompsoni, Leiabbottella thompsoni G.T. Watters, 2013 - (POMATIIDAE)
- thompsoni, Pseudovermis thompsoni L. Salvini-Plawén, 1991 - (PSEUDOVERMIDAE)
- thompsoni, Runcinella thompsoni J.A. Ortea & G. Rodríguez, 1993 - (RUNCINIDAE)
- thompsoni, Notobryon thompsoni M. Pola, Y. Camacho-García & T.M. Gosliner, 2012 - (SCYLLAEIDAE)
- thompsoni, Parvedentulina thompsoni K.C. Emberton, 2010 - (STREPTAXIDAE)
- thompsoni, Gulella thompsoni K.C. Emberton, 2010 - (STREPTAXIDAE)
- thompsoni, Eudolium thompsoni J.T.L. McGinty, 1955 - syn of: Eudolium crosseanum (T.A. de M. Monterosato, 1869) - (TONNIDAE)
- thompsoni, Fayettoceras thompsoni (Miller, 1894 †) - (VALCOUROCERATIDAE) (FOSSIL)
- thompsoni, Macromphalina thompsoni E. Rolán & F. Rubio, 1998 - (VANIKORIDAE)
- thompsoni, Westonoceras thompsoni Miller, Youngquist & Collinson, 1954 † - syn of: Beloitoceras thompsoni (Miller, Youngquist & Collinson, 1954 †) - (WESTONOCERATIDAE) (FOSSIL)
- thompsoni nigricans, Thaumastus thompsoni nigricans A. Cousin, 1887 - syn of: Kara thompsoni (L. Pfeiffer, 1845) - (MEGASPIRIDAE)
- thompsoni olivacea, Thaumastus thompsoni olivacea A. Cousin, 1887 - syn of: Kara thompsoni (L. Pfeiffer, 1845) - (MEGASPIRIDAE)
- thompsoni zebra, Thaumastus thompsoni zebra A. Cousin, 1887 - syn of: Kara thompsoni (L. Pfeiffer, 1845) - (MEGASPIRIDAE)
- thompsoniana, Ashmunella thompsoniana (C.M.F. Ancey, 1887) - (POLYGYRIDAE)
- thompsonii, Astarte thompsonii Damon, 1860 † - (ASTARTIDAE) (FOSSIL)
- thompsonii, Bulimus thompsonii L. Pfeiffer, 1845 - syn of: Kara thompsoni (L. Pfeiffer, 1845) - (BULIMULIDAE)
- thompsonoides, Thaumastus thompsonoides A. Oberwimmer, 1931 - (MEGASPIRIDAE)
- thompsonorum, Obornella thompsonorum M.G. Harasewych & S. Kiel, 2007 † - (PLEUROTOMARIIDAE) (FOSSIL)
- thomseni, Pliciscala thomseni Schnetler, 2001 † - (EPITONIIDAE) (FOSSIL)
- thomsonae, Volvarina thomsonae J.A. Ortea, 2014 - (MARGINELLIDAE)
- thomsonae, Glossaulax thomsonae C.J.S. Hickman, 1969 † - (NATICIDAE) (FOSSIL)
- thomsoni, Hemichenopus thomsoni (J.K. Allan, 1926 †) - (APORRHAIDAE) (FOSSIL)
- thomsoni, Awateria thomsoni A.W.B. Powell, 1942 † - (BORSONIIDAE) (FOSSIL)
- thomsoni, Aeneator thomsoni (J. Marwick, 1924 †) - (BUCCINIDAE) (FOSSIL)
- thomsoni, Semicassis thomsoni (J.W. Brazier, 1875) - (CASSIDAE)
- thomsoni, Glycymeris thomsoni J. Marwick, 1929 † - (GLYCYMERIDIDAE) (FOSSIL)
- thomsoni, Scrinium thomsoni A.W.B. Powell, 1942 † - (MITROMORPHIDAE) (FOSSIL)
- thomsoni, Murchisonia thomsoni de Koninck, 1883 † - syn of: Donaldospira pertusa (de Koninck, 1883 †) - (MURCHISONIIDAE) (FOSSIL)
- thomsoni, Cellana thomsoni Powell & J.A. Bartrum, 1929 † - (NACELLIDAE) (FOSSIL)
- thomsoni, Cerithiella thomsoni P.A. Maxwell, 1992 † - (NEWTONIELLIDAE) (FOSSIL)
- thomsoni, Limnotrochus thomsoni E.A. Smith, 1880 - (PALUDOMIDAE)
- thomsoni, Phialopecten thomsoni J. Marwick, 1965 † - (PECTINIDAE) (FOSSIL)
- thomsoni, Parapholas thomsoni (H.H. Suter, 1917 †) - (PHOLADIDAE) (FOSSIL)
- thomsoni, Pholadidea thomsoni H.H. Suter, 1917 † - (PHOLADIDAE) (FOSSIL)
- thomsoni, Pleurotomaria thomsoni Tate † - (PLEUROTOMARIIDAE) (FOSSIL)
- thomsoni, Acanthopleuroceras thomsoni Smith & Tipper, 1996 † - (POLYMORPHITIDAE) (FOSSIL)
- thomsoni, Hesperiella thomsoni (de Koninck, 1883 †) - (PORCELLIIDAE) (FOSSIL)
- thomsoni, Pterotrigonia thomsoni Kelly 1995 † - (PTEROTRIGONIIDAE) (FOSSIL)
- thomsoni, Paralaoma thomsoni H.H. Suter, 1917 - (PUNCTIDAE)
- thomsoni, Signepupina thomsoni (E. Forbes, 1851) - (PUPINIDAE)
- thomsoni, Taranis thomsoni M.K. Mestayer, 1919 - syn of: Taranis nexilis bicarinata (H.H. Suter, 1915) - (RAPHITOMIDAE)
- thomsoni, Alvania thomsoni (H.B.S. Friele, 1877) - syn of: Punctulum wyvillethomsoni (H.B.S. Friele, 1877) - (RISSOIDAE)
- thomsoni, Rissoa thomsoni F. Nordsieck, 1972 - syn of: Punctulum wyvillethomsoni (H.B.S. Friele, 1877) - (RISSOIDAE)
- thomsoni, Piatnitzkyceras thomsoni F.A. Medina & A.C. Riccardi, 2006 † - (SILESITIDAE) (FOSSIL)
- thomsoni, Streptostyla thomsoni (C.M.F. Ancey, 1886) - (SPIRAXIDAE)
- thomsoni, Pseudodon thomsoni P.M.A. Morelet, 1884 - (UNIONIDAE)
- thomsoni, Tomelasmus thomsoni (R. Arango, 1884) - (UROCOPTIDAE)
- thomsoni, Eumarcia thomsoni J. Marwick, 1927 † - (VENERIDAE) (FOSSIL)
- thomsoni, Paludina thomsoni L.J. Morlet, 1885 - (VIVIPARIDAE)
- thomsoni, Spinomelon thomsoni J. Marwick, 1926 † - (VOLUTIDAE) (FOSSIL)
- thomsoni palinodia, Semicassis thomsoni palinodia T. Iredale, 1931 - syn of: Semicassis thomsoni (J.W. Brazier, 1875) - (CASSIDAE)
- thomsoni perezi, Tomelasmus thomsoni perezi C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- thomsoni simonis, Tomelasmus thomsoni simonis C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- Thomsonia, syn of: Subgenus Planorbella (Seminolina) H.A. Pilsbry, 1934 (PLANORBIDAE)
- thomsoniana, Ashmunella thomsoniana C.M.F. Ancey, 1887 - syn of: Ashmunella thompsoniana (C.M.F. Ancey, 1887) - (POLYGYRIDAE)
- thomsonianus, Turbo thomsonianus King, 1848 † - (TURBINIDAE) (FOSSIL)
- thomsonii, Teredora thomsonii G.W. Tryon, 1863 - syn of: Teredora malleolus (W. Turton, 1822) - (TEREDINIDAE)
- thonensis, Trigonopis thonensis Fischer, 1969 † - (ASTARTIDAE) (FOSSIL)
- thoracica, Scintilla thoracica A.A. Gould, 1861 - (GALEOMMATIDAE)
- thoracica, Scabrotrigonia thoracica (Morton, 1834 †) - (PTEROTRIGONIIDAE) (FOSSIL)
- thoracica, Trigonia thoracica Morton, 1834 † - syn of: Scabrotrigonia thoracica (Morton, 1834 †) - (TRIGONIIDAE) (FOSSIL)
- thoracicus, Lirofusus thoracicus (T.A. Conrad, 1833 †) - (FASCIOLARIIDAE) (FOSSIL)
- thoracites, Bactronophorus thoracites (A.A. Gould, 1856) - (TEREDINIDAE)
- thoracites, Teredo thoracites A.A. Gould, 1856 - syn of: Bactronophorus thoracites (A.A. Gould, 1856) - (TEREDINIDAE)
- Thoracium, syn of: Genus Monetaria F.H. Troschel, 1863 (CYPRAEIDAE)
- Thoracoceras, Genus Thoracoceras Fischer de Waldheim, 1844 † (KIONOCERATIDAE) (FOSSIL)
- Thoraconus, syn of: Genus Fulgiconus A.J. Da Motta, 1991 (CONIDAE)
- thorae, Conus thorae Finlay, 1927 † - (CONIDAE) (FOSSIL)
- thorae, Callocardia guttata thorae E.H. Vokes, 1985 - (VENERIDAE)
- thorali, Acrioceras thorali Sarkar, 1955 † - syn of: Protacrioceras thorali (Sarkar, 1955 †) - (ANCYLOCERATIDAE) (FOSSIL)
- thorali, Cyclostomiceras thorali Kröger & J. Evans, 2011 † - (CYCLOSTOMICERATIDAE) (FOSSIL)
- thorali, Protacrioceras thorali (Sarkar, 1955 †) - (EMERICICERATIDAE) (FOSSIL)
- Thoralia, Genus Thoralia Morris, 1980 † (THORALIIDAE) (FOSSIL)
- THORALIIDAE Morris, 1980 † - Family (BIVALVIA-PALAEOHETERODONTA [Subclass]) (FOSSIL)
- Thoralispira, Genus Thoralispira Horný & Vizcaïno, 1995 † (SINUITIDAE) (FOSSIL)
- Thoraloceras, Genus Thoraloceras Kröger & Evans, 2011 † (TROEDSSONELLIDAE) (FOSSIL)
- Thordisa, Genus Thordisa L.S.R. Bergh, 1877 (DISCODORIDIDAE)
- thorei, Loxotaphrus thorei (J.P.S. Grateloup, 1845 †) - (CANCELLARIIDAE) (FOSSIL)
- thorektes, Emarginula thorektes R.N. Kilburn, 1978 - (FISSURELLIDAE)
- thorensis, Falcidens thorensis L. Salvini-Plawén, 1971 - (CHAETODERMATIDAE)
- thoreyi, Bulimulus thoreyi H.H. Beck, 1837 - (BULIMULIDAE)
- thori, Taonius thori E. Degner, 1925 - syn of: Teuthowenia megalops (V. Prosch, 1849) - (CRANCHIIDAE)
- thori, Dosinia acetabulum thori L.W. Ward, 1992 † - (VENERIDAE) (FOSSIL)
- Thorinia, syn of: Genus Heliacus D'Orbigny, 1842 (ARCHITECTONICIDAE)
- Thorista, syn of: Genus Coelotrochus P. Fischer in L.C. Kiener & P. Fischer, 1880 (TROCHIDAE)
- Thoristella, syn of: Genus Coelotrochus P. Fischer in L.C. Kiener & P. Fischer, 1880 (TROCHIDAE)
- thorndikei, Strophiops thorndikei C.J. Maynard, 1894 - (CERIONIDAE)
- thorni, Umbilia capricornica thorni J.D. Daughenbaugh & M. Beals, 2014 - (CYPRAEIDAE)
- thornleyae, Pitar thornleyae K.L. Lamprell & J.M. Healy, 1997 - (VENERIDAE)
- thornleyana, Filodrillia thornleyana C.F. Laseron, 1954 - (BORSONIIDAE)
- thornleyana, Clathropsis thornleyana C.F. Laseron, 1956 - (CERITHIOPSIDAE)
- thornleyana, Turbonilla thornleyana C.F. Laseron, 1951 - (PYRAMIDELLIDAE)
- thornleyana, Dentrissoina thornleyana C.F. Laseron, 1956 - syn of: Tomlinella insignis (A. Adams & L.A. Reeve, 1850) - (ZEBINIDAE)
- thornleyanus, Guraleus thornleyanus (C.F. Laseron, 1954) - (MANGELIIDAE)
- thornliebankense, Catastroboceras thornliebankense H. Turner, 1965 † - syn of: Stroboceras humerosum A. Schmidt, 1951 † - (AKTUBONAUTILIDAE) (FOSSIL)
- thorntoniensis, Corystos thorntoniensis Vendrasco & al., 2010 † - (MOLLUSCA INCERTAE SEDIS) (FOSSIL)
- thorogoodi, Thersites thorogoodi T. Iredale, 1937 - (CAMAENIDAE)
- thorsenae, Opalia thorsenae E.F. Garcia, 2004 - (EPITONIIDAE)
- thorslundi, Mytilarca thorslundi Isberg, 1934 † - (AMBONYCHIIDAE) (FOSSIL)
- thorslundi, Palaeoneilo thorslundi Isberg, 1934 † - (MALLETIIDAE) (FOSSIL)
- thorslundi, Cyrtorizoceras thorslundi Kröger, 2013 † - (ONCOCERATIDAE) (FOSSIL)
- Thorslundia, Genus Thorslundia Isberg, 1934 † (CYRTODONTIDAE) (FOSSIL)
- thorsoni, Bathyspinula thorsoni (Z.A. Filatova, 1976) - (BATHYSPINULIDAE)
- thorsoni, Modiolus thorsoni K.W. Ockelmann, 1983 - syn of: Modiolus lulat (P. Dautzenberg, 1891) - (MYTILIDAE)
- thorssoni, Pusia thorssoni G.T. Poppe, E.G. Guillot de Suduiraut & S.P. Tagaro, 2006 - (COSTELLARIIDAE)
- thorssoni, Epitonium thorssoni H. DuShane, 1988 - (EPITONIIDAE)
- thorssoni, Kermia thorssoni C.K. Chang, 2001 - (RAPHITOMIDAE)
- thorsteinssoni, Gyronema thorsteinssoni Rohr & Smith, 1978 † - syn of: Oriostoma thorsteinssoni (Rohr & Smith, 1978 †) - (LOPHOSPIRIDAE) (FOSSIL)
- thorsteinssoni, Oriostoma thorsteinssoni (Rohr & Smith, 1978 †) - (ORIOSTOMATIDAE) (FOSSIL)
- thorsteinssoni, Amundiptychites thorsteinssoni Jeletzky & Kemper, 1988 † - (POLYPTYCHITIDAE) (FOSSIL)
- thorsteinssoni, Tryblidium thorsteinssoni Boucot, 1975 † - (TRYBLIDIIDAE) (FOSSIL)
- Thorsteinssonoceras, Genus Thorsteinssonoceras Jeletzky , 1965 † (POLYPTYCHITIDAE) (FOSSIL)
- Thorunna, Genus Thorunna L.S.R. Bergh, 1878 (CHROMODORIDIDAE)
- thorvaldssoni, Protolira thorvaldssoni A. Warén, 1996 - (SKENEIDAE)
- thorybopus, Manaria thorybopus (P. Bouchet & A. Warén, 1986) - (BUCCINIDAE)
- Thorybopus, Genus Thorybopus P. Bouchet, 1977 (DISCODORIDIDAE)
- thos, Marginella thos S.G. Veldsman, 2013 - (MARGINELLIDAE)
- thospitis, Assyriella thospitis H. Schütt & P. Subai, 1996 - (HELICIDAE)
- thouarsense, Grammoceras thouarsense (A.V.M.D. D'Orbigny, 1844 †) - (HILDOCERATIDAE) (FOSSIL)
- thouarsensis, Ammonites thouarsensis d'Orbigny, 1844 † - (AMMONITIDA (UNASSIGNED)) (FOSSIL)
- thouarsiana, Chaetopleura thouarsiana A. de Rochebrune, 1882 - (CHAETOPLEURIDAE)
- thouarsii, Cyclocardia thouarsii (A.V.M.D. D'Orbigny, 1845) - (CARDITIDAE)
- thouarsii, Cardita thouarsii D'Orbigny, 1845 - syn of: Cyclocardia thouarsii (A.V.M.D. D'Orbigny, 1845) - (CARDITIDAE)
- thouarsii, Venus thouarsii A. Valenciennes in A. Dupetit-Thouars, 1846 - syn of: Periglypta multicostata (G.B. I Sowerby, 1835) - (VENERIDAE)
- thouinensis, Cystiscus thouinensis (W.L. May, 1916) - (CYSTISCIDAE)
- thouinensis, Alvania thouinensis (K.H.J. Thiele, 1925) - (RISSOIDAE)
- thouinensis, Alvania thouinensis K.H.J. Thiele, 1925 - syn of: Alvania thouinensis (K.H.J. Thiele, 1925) - (RISSOIDAE)
- thouvignoni, Turbo thouvignoni Magne & Saubade, 1971 † - (TURBINIDAE) (FOSSIL)
- Thovana, Genus Thovana J.E. Gray, 1847 † (PHOLADIDAE) (FOSSIL)
- Thracia, Genus Thracia W.E. Leach in H.M.D. De Blainville, 1824 (THRACIIDAE)
- thraciaeformis, Portlandella thraciaeformis D.H. Storer, 1838 - syn of: Megayoldia thraciaeformis (D.H. Storer, 1838) - (NUCULANIDAE)
- thraciaeformis, Nucula thraciaeformis D.H. Storer, 1838 - syn of: Megayoldia thraciaeformis (D.H. Storer, 1838) - (NUCULIDAE)
- thraciaeformis, Megayoldia thraciaeformis (D.H. Storer, 1838) - (YOLDIIDAE)
- thracica, Argna thracica P. Subai, 1999 - (ARGNIDAE)
- thracica, Helix thracica W. Kobelt, 1906 - syn of: Campylaea trizona rumelica (E.A. Rossmässler, 1838) - (HELICIDAE)
- thracica, Grossuana thracica P. Glöer & D.G. Georgiev, 2009 - (HYDROBIIDAE)
- thracica, Candidula thracica A.J. Wagner, 1928 - (HYGROMIIDAE)
- thracica, Koskinakra thracica M. Harzhauser, O. Mandic & al., 2016 † - (RISSOIDAE) (FOSSIL)
- thracica, Sengoeria thracica M. Harzhauser, O. Mandic & al., 2016 † - (THIARIDAE) (FOSSIL)
- Thracidentula, Genus Thracidentula T.A. Garrard, 1961 (THRACIIDAE)
- Thracidora, Genus Thracidora T. Iredale, 1924 (THRACIIDAE)
- Thraciella, syn of: Genus Euxina O. Böttger, 1877 (CLAUSILIIDAE)
- THRACIIDAE Stoliczka, 1870 (1839) - Family (BIVALVIA-HETERODONTA [Subclass]-EUHETERODONTA [Infraclass]-ANOMALODESMATA [Order]-THRACIOIDEA [Superfamily])
- thracioides, Tumbeziconcha thracioides (A. Adams & L.A. Reeve, 1850) - (MACTRIDAE)
- Thraciokellia, Genus Thraciokellia J.T. Kuroda & T. Habe, 1971 (KELLIIDAE)
- Thraciopsis, Genus Thraciopsis R. Tate & W.L. May, 1900 (THRACIIDAE)
- thraivensis, Girvanolithes thraivensis (Reed, 1909 †) - (CIRCOTHECIDAE) (FOSSIL)
- thraivensis, Cyrtolites thraivensis Reed, 1921 † - (CYRTOLITIDAE) (FOSSIL)
- thraivensis, Palaeoschisma thraivensis Longstaff, 1924 † - (EOTOMARIIDAE) (FOSSIL)
- thraivensis, Arjamannia thraivensis (Longst, 1924 †) - (LOPHOSPIRIDAE) (FOSSIL)
- thrapstonense, Clydoniceras thrapstonense W.J. Arkell, 1951 † - (CLYDONICERATIDAE) (FOSSIL)
- thrasu, Pseudogrammoceras thrasu Buckman, 1902 † - (HILDOCERATIDAE) (FOSSIL)
- thrasys, Mazescala thrasys T. Iredale, 1936 - syn of: Epitonium bellicosum C. Hedley, 1907 - (EPITONIIDAE)
- thrausta, Oospira thrausta (F.E. Loosjes, 1953) - (CLAUSILIIDAE)
- Thraxites, Genus Thraxites † (AMMONOIDEA (UNASSIGNED)) (FOSSIL)
- Threaroceras, Genus Threaroceras Flower, 1945 † (RUTOCERATIDAE) (FOSSIL)
- Threavia, Genus Threavia Lamont, 1946 † (HOLOPEIDAE) (FOSSIL)
- Thrincoceras, Genus Thrincoceras Hyatt, 1893 † (TRIGONOCERATIDAE) (FOSSIL)
- THRINCOCERATIDAE Ruzhentsev & Shimanskiy, 1954 † - Family (CEPHALOPODA-NAUTILOIDEA [Subclass]-NAUTILIDA [Order]) (FOSSIL)
- thrincoma, Calliostoma thrincoma J.C. Melvill & R. Standen, 1903 - (CALLIOSTOMATIDAE)
- thrix, Ganesella thrix J.H. Ponsonby, 1906 - (CAMAENIDAE)
- Throna, syn of: Genus Thracia W.E. Leach in H.M.D. De Blainville, 1824 (THRACIIDAE)
- Thronacar, syn of: Genus Barbatia J.E. Gray, 1847 (ARCIDAE)
- Throopella, Genus Throopella Greger, 1933 † (SCAPHOPODA INCERTAE SEDIS) (FOSSIL)
- thryallis, Turbonilla thryallis J.C. Melvill, 1918 - (PYRAMIDELLIDAE)
- Thryasona, Genus Thryasona B.J. Smith & J.A. Kershaw, 1985 (CHAROPIDAE)
- thryptica, Limaria thryptica (L. Penna-Neme, 1971) - (LIMIDAE)
- thryptica, Cryptomya thryptica P.G. Oliver & H.C.G. Chesney, 1997 - (MYIDAE)
- thuanae, Pyrgiscus thuanae (E. Saurin, 1959) - (PYRAMIDELLIDAE)
- thuelchus, Solen thuelchus S.C.T. Hanley, 1842 - (SOLENIDAE)
- thuillieri, Candidula thuillieri J.F. Mabille, 1877 - syn of: Candidula gigaxii (L. Pfeiffer, 1850) - (HYGROMIIDAE)
- thula, Lucinoma thula J. D. Taylor & Glover, 2017 - (LUCINIDAE)
- thula, Goniophora thula Kriz & al., 2011 † - (MODIOMORPHIDAE) (FOSSIL)
- Thularion, Genus Thularion J. Stanisic, 1993 (HELICARIONIDAE)
- thule, Euconia thule (Salter †) - (SINUOPEIDAE) (FOSSIL)
- thulensis, Latitaenia thulensis (E.F.R.K. Koken, 1896 †) - (GOSSELETINIDAE) (FOSSIL)
- thulensis, Kingites thulensis Tozer, 1994 † - (MELAGATHICERATIDAE) (FOSSIL)
- thulensis, Proneomenia thulensis K.H.J. Thiele, 1900 - syn of: Thieleherpia thulensis (K.H.J. Thiele, 1900) - (PRONEOMENIIDAE)
- thulensis, Thieleherpia thulensis (K.H.J. Thiele, 1900) - (RHIPIDOHERPIIDAE)
- thulensis, Subulites thulensis E.F.R.K. Koken, 1897 † - (SUBULITIDAE) (FOSSIL)
- thulensis, Syngenoherpia thulensis K.H.J. Thiele, 1900 - syn of: Thieleherpia thulensis (K.H.J. Thiele, 1900) - (SYNGENOHERPIIDAE)
- thunensis, Aequipecten thunensis Mayer-Eymar, 1887 † - (PECTINIDAE) (FOSSIL)
- Thuridilla, Genus Thuridilla L.S.R. Bergh, 1872 (PLAKOBRANCHIDAE)
- Thuringionautilus, syn of: Genus Germanonautilus von Mojsisovics, 1902 † (TAINOCERATIDAE) (FOSSIL)
- Thuringionautilus, syn of: Genus Germanonautilus von Mojsisovics, 1902 † (TAINOCERATIDAE) (FOSSIL)
- Thurlosia, syn of: Genus Zirfaea J.E. Gray, 1842 (PHOLADIDAE)
- thurmanni, Thurmannia thurmanni Pictet & Campiche, 1860 † - syn of: Thurmanniceras thurmanni (Pictet & Campiche, 1860 †) - (AMMONOIDEA (unassigned)) (FOSSIL)
- thurmanni, Rostroperna thurmanni (Contejean 1860) † - (MALLEIDAE) (FOSSIL)
- thurmanni, Thurmanniceras thurmanni (Pictet & Campiche, 1860 †) - (NEOCOMITIDAE) (FOSSIL)
- thurmanni, Philine thurmanni Er. Marcus & Ev. Marcus, 1969 - (PHILINIDAE)
- thurmanni, Valfinia thurmanni (Loriol & Koby, 1890 †) - (TROCHOTOMIDAE) (FOSSIL)
- thurmanni, Ditremaria thurmanni Loriol & Koby, 1890 † - syn of: Valfinia thurmanni (Loriol & Koby, 1890 †) - (TROCHOTOMIDAE) (FOSSIL)
- thurmanni chilla, Praephiline thurmanni chilla Er. Marcus & Ev. Marcus, 1969 - syn of: Laona chilla (Er. Marcus & Ev. Marcus, 1969) - (PHILINIDAE)
- Thurmannia, syn of: Genus Thurmanniceras Cossmann , 1901 † (NEOCOMITIDAE) (FOSSIL)
- Thurmanniceras, Genus Thurmanniceras Cossmann , 1901 † (NEOCOMITIDAE) (FOSSIL)
- Thurmannites, syn of: Genus Thurmanniceras Cossmann , 1901 † (NEOCOMITIDAE) (FOSSIL)
- thurrelli, Xenostephanoides thurrelli Arkell & P. Callomon, 1963 † - (AULACOSTEPHANIDAE) (FOSSIL)
- thurrelli, Craspedites thurrelli Casey † - (POLYPTYCHITIDAE) (FOSSIL)
- thurstoni, Achatinella sowerbyana thurstoni H.A. Pilsbry & C.M. Cooke, 1914 - (ACHATINELLIDAE)
- thurstoni, Amastra thurstoni C.M. Cooke, 1917 - (AMASTRIDAE)
- thurstoni, Manaria thurstoni E.A. Smith, 1906 - (BUCCINIDAE)
- thurstoni, Fragum thurstoni W.H. Dall, P. Bartsch & H.A. Rehder, 1938 - syn of: Fragum mundum (L.A. Reeve, 1845) - (CARDIIDAE)
- thurstoni, Turricula thurstoni (E.A. Smith, 1896) - (CLAVATULIDAE)
- thurstoni, Euconulus thurstoni H.B. Baker, 1941 - (EUCONULIDAE)
- thurstoni, Pelseneeria thurstoni (R. Winckworth, 1936) - (EULIMIDAE)
- thurstoni, Batheulima thurstoni P. Bouchet & A. Warén, 1986 - (EULIMIDAE)
- thurstoni, Samoana thurstoni (C.M. Cooke & D.M. Crampton, 1930) - (PARTULIDAE)
- thurstoni, Sepia thurstoni W. Adam & P.A. van Rees, 1966 - (SEPIIDAE)
- thurstoni bembicodes, Amastra thurstoni bembicodes C.M. Cooke, 1933 - (AMASTRIDAE)
- thuscus, Conus thuscus G.D. Nardo, 1847 - syn of: Lautoconus ventricosus (J.F. Gmelin, 1791) - (CONIDAE)
- thusneldae, Sirenotrachyceras thusneldae (Mojsisovics, 1893 †) - (TRACHYCERATIDAE) (FOSSIL)
- thuthaoae, Oophana thuthaoae Thach, 2017 - (STREPTAXIDAE)
- thwaitesi, Tortulosa thwaitesi (L. Pfeiffer, 1852) - (PUPINIDAE)
- thwingi, Perdicella thwingi H.A. Pilsbry & C.M. Cooke, 1914 - (ACHATINELLIDAE)
- thwingi, Cookeconcha thwingi (C.M.F. Ancey, 1904) - (ENDODONTIDAE)
- Thyas, syn of: Genus Arca C. Linnaeus, 1758 (ARCIDAE)
- Thyasira, Genus Thyasira J.B.P.A. Lamarck, 1818 (THYASIRIDAE)
- THYASIRIDAE Dall, 1900 (1895) - Family (BIVALVIA-HETERODONTA [Subclass]-EUHETERODONTA [Infraclass]-IMPARIDENTIA [Superorder]-LUCINIDA [Order]-THYASIROIDEA [Superfamily])
- Thyca, Genus Thyca H. Adams & A. Adams, 1854 (EULIMIDAE)
- Thyella, syn of: Genus Thyellisca E.H. Vokes, 1956 (SEMELIDAE)
- Thyellisca, Genus Thyellisca E.H. Vokes, 1956 (SEMELIDAE)
- thyermani, Marginella thyermani F.P. Marrat, 1876 - syn of: Glabella tyermani (F.P. Marrat, 1876) - (MARGINELLIDAE)
- thygatrica, Daphnella thygatrica É.A.A. Locard, 1897 - (RAPHITOMIDAE)
- Thylacoceras, Genus Thylacoceras Teichert & Glenister, 1952 † (THYLACOCERATIDAE) (FOSSIL)
- THYLACOCERATIDAE Teichert & Glenister, 1954 † - Family (CEPHALOPODA-NAUTILOIDEA [Subclass]-ENDOCERIDA [Order]) (FOSSIL)
- Thylacodes, Genus Thylacodes J.É. Guettard, 1770 (VERMETIDAE)
- Thylacodus, syn of: Genus Vermetus F.M. Daudin, 1800 (VERMETIDAE)
- Thylacus, Genus Thylacus Conrad, 1860 † (CALYPTRAEIDAE) (FOSSIL)
- Thylaeodus, Subgenus Vermetus (Thylaeodus) O.A.L. Mörch, 1860 (VERMETIDAE)
- thylax, Epitonium thylax W.H. Dall, 1917 - syn of: Epitonium elenense (G.B. Sowerby, 1844) - (EPITONIIDAE)
- thylicus, Cratis thylicus P.G. Oliver & A.M. Holmes, 2004 - (PHILOBRYIDAE)
- thymares, Tellina thymares J.C. Melvill, 1896 - syn of: Tellina capsoides J.B.P.A. Lamarck, 1818 - (TELLINIDAE)
- thyne, Turbonilla thyne P. Bartsch, 1924 - (PYRAMIDELLIDAE)
- Thyonicola, Genus Thyonicola G. Mandahl-Barth, 1941 (EULIMIDAE)
- thyraea, Parviterebra thyraea (J.C. Melvill & R. Standen, 1897) - (COLUMBELLIDAE)
- thyraea, Terebra thyraea J.C. Melvill & R. Standen, 1897 - syn of: Parviterebra thyraea (J.C. Melvill & R. Standen, 1897) - (TEREBRIDAE)
- thyraeum, Epitonium thyraeum R.N. Kilburn, 1985 - (EPITONIIDAE)
- Thyrasona, syn of: Subgenus Therasia (Phenacohelix) H.H. Suter, 1892 (CHAROPIDAE)
- Thyrastylon, Genus Thyrastylon Chubb, 1956 † (RADIOLITIDAE) (FOSSIL)
- Thyreopsis, Genus Thyreopsis H. Adams, 1868 (GALEOMMATIDAE)
- thyreus, Ariophanta thyreus W.H. Benson, 1852 - (ARIOPHANTIDAE)
- Thyreus, syn of: Genus Pedicularia W.J. Swainson, 1840 (PEDICULARIIDAE)
- thyrideum, Parvamussium thyrideum (J.C. Melvill in J.C. Melvill & R. Standen, 1907) - (PROPEAMUSSIIDAE)
- thyrideus, Pecten thyrideus J.C. Melvill in J.C. Melvill & R. Standen, 1907 - syn of: Parvamussium thyrideum (J.C. Melvill in J.C. Melvill & R. Standen, 1907) - (PECTINIDAE)
- thyridota, Lienardia thyridota (J.C. Melvill & R. Standen, 1896) - (CLATHURELLIDAE)
- thyridota, Mangilia thyridota J.C. Melvill & R. Standen, 1896 - syn of: Lienardia thyridota (J.C. Melvill & R. Standen, 1896) - (MANGELIIDAE)
- thyridota, Hemilienardia thyridota J.C. Melvill & R. Standen, 1896 - syn of: Lienardia thyridota (J.C. Melvill & R. Standen, 1896) - (RAPHITOMIDAE)
- Thyrius, syn of: Genus Pedicularia W.J. Swainson, 1840 (PEDICULARIIDAE)
- thyroides, Mesodon thyroides T. Say, 1816 - syn of: Mesodon thyroidus (T. Say, 1816) - (POLYGYRIDAE)
- thyroidus, Mesodon thyroidus (T. Say, 1816) - (POLYGYRIDAE)
- thyroidus bucculentus, Mesodon thyroidus bucculentus (A.A. Gould, 1848) - (POLYGYRIDAE)
- Thyrophorella, Genus Thyrophorella Greef, 1882 (THYROPHORELLIDAE)
- THYROPHORELLIDAE Girard, 1895 - Family (GASTROPODA-HETEROBRANCHIA [Subclass]-PULMONATA [Infraclass]-STYLOMMATOPHORA [Order]-PUNCTOIDEA [Superfamily])
- thyrrena, Phymatopleura thyrrena (C. Gemmellaro, 1889 †) - (PHYMATOPLEURIDAE) (FOSSIL)
- thyrrena, Pleurotomaria thyrrena C. Gemmellaro, 1889 † - syn of: Phymatopleura thyrrena (C. Gemmellaro, 1889 †) - (PLEUROTOMARIIDAE) (FOSSIL)
- thyrrena, Rutotia thyrrena C. Gemmellaro, 1896 † - (PTERIOMORPHIA (UNASSIGNED)) (FOSSIL)
- thyrrenicum, Mercaticeras thyrrenicum Fucini, 1905 † - (HILDOCERATIDAE) (FOSSIL)
- Thyrreniellina, syn of: Genus Tyrrheniellina F.L. Giusti & G. Manganelli, 1992 (HYGROMIIDAE)
- thyrrenus, Cenoceras thyrrenus (Tagliarini, 1901 †) - (CENOCERATIDAE) (FOSSIL)
- thyrrenus, Nautilus thyrrenus Tagliarini, 1901 † - syn of: Cenoceras thyrrenus (Tagliarini, 1901 †) - (NAUTILIDAE) (FOSSIL)
- thyrsus, Kopaninoceras thyrsus (Barrande, 1870 †) - (ORTHOCERATIDAE) (FOSSIL)
- thyrsus, Gemmula thyrsus E.W. Vredenburg, 1921 † - (TURRIDAE) (FOSSIL)
- Thysanobuccinum, Genus Thysanobuccinum A.N. Golikov & V.V. Gulbin in A.N. Golikov, 1980 (BUCCINIDAE)
- Thysanoceras, Genus Thysanoceras Hyatt, 1867 † (MOLLUSCA INCERTAE SEDIS) (FOSSIL)
- Thysanodonta, Genus Thysanodonta B.A. Marshall, 1988 (CALLIOSTOMATIDAE)
- Thysanolytoceras, syn of: Genus Lytoceras Monestier, 1921 † (LYTOCERATIDAE) (FOSSIL)
- thysanophora, Eledone thysanophora N.A. Voss, 1962 - syn of: Eledone schultzei (W.E. Hoyle, 1910) - (OCTOPODIDAE)
- Thysanophora, Genus Thysanophora H. Strebel & G.J. Pfeffer, 1880 (THYSANOPHORIDAE)
- THYSANOPHORIDAE Pilsbry, 1926 - Family (GASTROPODA-HETEROBRANCHIA [Subclass]-PULMONATA [Infraclass]-STYLOMMATOPHORA [Order]-POLYGYROIDEA [Superfamily])
- thysanopoda, Thuridilla thysanopoda (L.S.R. Bergh, 1905) - (PLAKOBRANCHIDAE)
- thysanoraphe, Colobostylus thysanoraphe (G.B. I Sowerby, 1843) - (POMATIIDAE)
- Thysanota, Genus Thysanota J.A. Albers, 1860 (CHAROPIDAE)
- THYSANOTEUTHIDAE Keferstein, 1866 - Family (CEPHALOPODA-COLEOIDEA [Subclass]-DECAPODIFORMES [Superorder]-OEGOPSIDA [Order])
- Thysanoteuthis, Genus Thysanoteuthis F.H. Troschel, 1857 (THYSANOTEUTHIDAE)
- thysi, Montenegrina skipetarica thysi F.E. Loosjes & F.E. Loosjes, 1988 - (CLAUSILIIDAE)
- thysthlon, Trigonostoma thysthlon R.E. Petit & M.G. Harasewych, 1987 - (CANCELLARIIDAE)
- thysvillense, Pseudopeas thysvillense H.A. Pilsbry, 1919 - (SUBULINIDAE)
- thysvillensis, Curvella thysvillensis H.A. Pilsbry, 1919 - (SUBULINIDAE)
- tia, Melanella tia (P. Bartsch, 1926) - (EULIMIDAE)
- tia, Eulima tia P. Bartsch, 1926 - syn of: Melanella tia (P. Bartsch, 1926) - (EULIMIDAE)
- tia, Turbonilla tia P. Bartsch, 1926 - (PYRAMIDELLIDAE)
- tia, Macrocallista tia Kellum, 1926 † - (VENERIDAE) (FOSSIL)
- Tiangangina, Genus Tiangangina S. Zhang (BRADYBAENIDAE)
- Tianjinospira, Genus Tianjinospira Youlou, 1978 † (CAENOGASTROPODA (UNASSIGNED)) (FOSSIL)
- tianjungensis, Etheripecten tianjungensis C.C. Lu, 1986 † - (HETEROPECTINIDAE) (FOSSIL)
- tianschanica, Cathaica tianschanica W.A. Lindholm, 1927 - syn of: Archaica heptapotamica (W.A. Lindholm, 1927) - (BRADYBAENIDAE)
- tianshanicus, Dzhaprakoceras tianshanicus (Librovitch, 1927 †) - (MAXIGONIATITIDAE) (FOSSIL)
- tianshanicus, Helicocyclus tianshanicus (Librovitch, 1927 †) - (PERICYCLIDAE) (FOSSIL)
- tianzhushanensis, Helcionella tianzhushanensis Yü, 1979 † - (HELCIONELLIDAE) (FOSSIL)
- tianzhushanensis, Purella tianzhushanensis Yü, 1979 † - syn of: Protoconus elegans (Yü, 1979 †) - (MAIKHANELLIDAE) (FOSSIL)
- Tianzhushania, Genus Tianzhushania Qian & al., 1979 † (HALKIERIIDAE) (FOSSIL)
- Tianzhushanospira, Genus Tianzhushanospira Yü, 1979 † (PELAGIELLIDAE) (FOSSIL)
- tiara, Pisinna tiara W.L. May, 1915 - (ANABATHRIDAE)
- tiara, Ancistrobasis tiara B.A. Marshall, 1991 - (ANCISTROBASIDAE)
- tiara, Drilliola tiara R.B. Watson, 1881 - syn of: Drilliola loprestiana (P. Calcara, 1841) - (BORSONIIDAE)
- tiara, Calliotropis tiara (R.B. Watson, 1879) - (CALLIOTROPIDAE)
- tiara, Krachia tiara (T.A. de M. Monterosato, 1874) - (CERITHIOPSIDAE)
- Tiara, syn of: Genus Vexillum P.F. Röding, 1798 (COSTELLARIIDAE)
- tiara, Diplommatina tiara J.J. Vermeulen, 1993 - (DIPLOMMATINIDAE)
- tiara, Cymatosyrinx tiara Gardner, 1948 † - (DRILLIIDAE) (FOSSIL)
- tiara, Nesophila tiara (J.W. Mighels, 1845) - (ENDODONTIDAE)
- tiara, Epitonium tiara P.P. Carpenter, 1856 - syn of: Epitonium obtusum (G.B. II Sowerby, 1844) - (EPITONIIDAE)
- tiara, Helix tiara J.W. Mighels - syn of: Nesophila tiara (J.W. Mighels, 1845) - (HELICIDAE)
- tiara, Liparoceras tiara Trueman, 1919 † - (LIPAROCERATIDAE) (FOSSIL)
- tiara, Mangelia tiara R.B. Watson, 1881 - syn of: Drilliola loprestiana (P. Calcara, 1841) - (MANGELIIDAE)
- Tiara, Subgenus Mitra (Tiara) Swainson, 1831 † (MITRIDAE) (FOSSIL)
- tiara, Colpites tiara (Sowerby, 1829 †) - (NATICOPSIDAE) (FOSSIL)
- tiara, Ostodes tiara A.A. Gould - (NEOCYCLOTIDAE)
- tiara, Barnea tiara R. Tate, 1887 † - (PHOLADIDAE) (FOSSIL)
- tiara, Platyschisma tiara Sowerby, 1829 † - syn of: Colpites tiara (Sowerby, 1829 †) - (PLATYCERATIDAE) (FOSSIL)
- tiara, Cyclostoma tiara A.A. Gould - syn of: Ostodes tiara A.A. Gould - (POMATIIDAE)
- tiara, Turbonilla tiara W.L. May, 1911 - (PYRAMIDELLIDAE)
- tiara, Ovirissoa tiara (W.L. May, 1915) - (RISSOIDAE)
- tiara, Solariella tiara R.B. Watson, 1879 - syn of: Calliotropis tiara (R.B. Watson, 1879) - (SOLARIELLIDAE)
- tiara, Trochus tiara J.L.M. Defrance † - (TROCHIDAE) (FOSSIL)
- tiara, Trochus tiara R.B. Watson, 1879 - syn of: Calliotropis tiara (R.B. Watson, 1879) - (TROCHIDAE)
- tiara, Turbo tiara M. Smith, 1936 † - (TURBINIDAE) (FOSSIL)
- tiara, Pleurotoma tiara R.B. Watson, 1881 - syn of: Drilliola loprestiana (P. Calcara, 1841) - (TURRIDAE)
- tiara, Venus tiara L.W. Dillwyn, 1817 - syn of: Placamen lamellatum (P.F. Röding, 1798) - (VENERIDAE)
- tiara, Placamen tiara L.W. Dillwyn, 1817 - syn of: Placamen lamellatum (P.F. Röding, 1798) - (VENERIDAE)
- tiara, Paravitrea tiara L.R. Hubricht, 1978 - (ZONITIDAE)
- Tiaracerithium, Subgenus Granulolabium (Tiaracerithium) F. Sacco, 1895 † (BATILLARIIDAE) (FOSSIL)
- tiaraeformis, Melanopsis tiaraeformis P.M. Pallary, 1936 - (MELANOPSIDAE)
- tiaraeides, Thalotia tiaraeides C. Vilvens, 2012 - (TROCHIDAE)
- tiarata, Paracingulina tiarata (H.A. Pilsbry, 1904) - (PYRAMIDELLIDAE)
- tiaratus, Miliariconus tiaratus (G.B. I Sowerby, 1833) - (CONIDAE)
- tiaratus, Conolithes tiaratus Martin, 1931 † - (CONIDAE) (FOSSIL)
- tiaratus, Coelotrochus tiaratus (J.R.C. Quoy & J.P. Gaimard, 1834) - (TROCHIDAE)
- tiaratus, Trochus tiaratus J.R.C. Quoy & J.P. Gaimard, 1834 - syn of: Coelotrochus tiaratus (J.R.C. Quoy & J.P. Gaimard, 1834) - (TROCHIDAE)
- tiarella, Torellia tiarella A.E. Verrill & S. Smith, 1882 - syn of: Torellia delicata (R.A. Philippi, 1844) - (CAPULIDAE)
- tiarella, Sinoennea tiarella W.S.S. Van Benthem-Jutting, 1961 - (DIAPHERIDAE)
- tiarella, Geomitra tiarella (P.B. Webb & S. Berthelot, 1833) - (HYGROMIIDAE)
- Tiarella, Genus Tiarella Swainson, 1840 (MITRIDAE)
- tiarella, Nebularia tiarella A. Adams, 1853 - syn of: Mitra coronata J.B.P.A. Lamarck, 1811 - (MITRIDAE)
- tiarella, Terebra tiarella G.P. Deshayes, 1857 - (TEREBRIDAE)
- Tiarellacerithium, Genus Tiarellacerithium Charpiat, 1919 † (CAENOGASTROPODA (UNASSIGNED)) (FOSSIL)
- tiarellus, Trochus tiarellus Tate, 1875 † - (TROCHIDAE) (FOSSIL)
- Tiariturris, Genus Tiariturris S.S. Berry, 1958 (PSEUDOMELATOMIDAE)
- tiarophoron, Glyphostoma tiarophoron J. Gardner, 1937 † - (CLATHURELLIDAE) (FOSSIL)
- Tiaropsis, syn of: Genus Thiara P.F. Röding, 1798 (THIARIDAE)
- tiarula, Buccinum tiarula L.C. Kiener, 1841 - syn of: Nassarius tiarula (L.C. Kiener, 1841) - (BUCCINIDAE)
- tiarula, Bela tiarula S.L. Lovén, 1846 - syn of: Sorgenfreispira brachystoma (R.A. Philippi, 1844) - (MANGELIIDAE)
- tiarula, Nassarius tiarula (L.C. Kiener, 1841) - (NASSARIIDAE)
- tiarula, Phrontis tiarula P. Dautzenberg, 1929 - syn of: Hebra corticata (A. Adams, 1852) - (NASSARIIDAE)
- tiarula, Phrontis tiarula R. Sturany, 1904 - syn of: Nassarius delicatus (A. Adams, 1852) - (NASSARIIDAE)
- tiarula, Nassa tiarula L.C. Kiener, 1841 - syn of: Nassarius tiarula (L.C. Kiener, 1841) - (NASSARIIDAE)
- tiarula, Alvania tiarula A. Adams, 1861 - (RISSOIDAE)
- tiarula, Strobilops tiarula (Sandberger, 1886) † - (STROBILOPSIDAE) (FOSSIL)
- tiassalensis, Neritina tiassalensis E.E. Binder, 1955 - (NERITIDAE)
- tibai, Diaphana tibai T. Habe, 1976 - syn of: Diaphana hiemalis (J.P.Y. Couthouy, 1839) - (DIAPHANIDAE)
- tibai, Alcadia tibai T. Habe, 1976 - (HELICINIDAE)
- tibai, Acharax tibai J.T. Kuroda, 1948 - syn of: Acharax johnsoni (W.H. Dall, 1891) - (SOLEMYIDAE)
- tibai, Acharax tibai Kuroda, 1948 - syn of: Acharax johnsoni (W.H. Dall, 1891) - (SOLEMYIDAE)
- tibai, Trochus tibai J.T. Kuroda, 1954 - (TROCHIDAE)
- tibana, Antalis tibana (S. Nomura, 1940) - (DENTALIIDAE)
- tibana, Neilonella tibana K. Oyama, 1953 - (NEILONELLIDAE)
- tibarenica, Metatheba tibarenica Neiber & Hausdorf, 2017 - (HYGROMIIDAE)
- Tibatrochus, Genus Tibatrochus S. Nomura, 1940 (CHILODONTIDAE)
- tibbettsi, Punctabyssia tibbettsi J.H. McLean, 1991 - (PSEUDOCOCCULINIDAE)
- tibboeli, Doriprismatica tibboeli (Á. Valdés & M.J. Adams, 2005) - (CHROMODORIDIDAE)
- Tiberia, Genus Tiberia T.A. de M. Monterosato, 1875 (PYRAMIDELLIDAE)
- tiberiadensis, Unio tiberiadensis É.A.A. Locard, 1883 - syn of: Unio terminalis J.R. Bourguignat, 1852 - (UNIONIDAE)
- tiberiana, Murella globularis tiberiana (L. Benoit, 1857) - (HELICIDAE)
- tiberiana, Galeodinopsis tiberiana (Coppi, 1876) - (RISSOIDAE)
- tiberiana, Voorwindia tiberiana (A. Issel, 1869) - (RISSOIDAE)
- tiberiana, Alvania tiberiana (Coppi, 1876) - syn of: Galeodinopsis tiberiana (Coppi, 1876) - (RISSOIDAE)
- tiberiana, Cantharidella tiberiana (J.C.H. Crosse, 1863) - (TROCHIDAE)
- tiberianum, Ancylus tiberianum J.R. Bourguignat, 1862 - syn of: Ancylus fluviatilis O.F. Müller, 1774 - (PLANORBIDAE)
- tiberianus, Trochus tiberianus J.C.H. Crosse, 1863 - syn of: Cantharidella tiberiana (J.C.H. Crosse, 1863) - (TROCHIDAE)
- tiberii, Siciliaria tiberii (A. Schmidt, 1868) - (CLAUSILIIDAE)
- tiberii, Epitonium tiberii (M.E.A. de Boury, 1890) - (EPITONIIDAE)
- tiberii, Anisus tiberii C. De Stefani, 1883 - syn of: Anisus spirorbis (C. Linnaeus, 1758) - (PLANORBIDAE)
- tiberii riberothi, Siciliaria tiberii riberothi R.A.M. Brandt, 1961 - (CLAUSILIIDAE)
- tiberii scalettensis, Siciliaria tiberii scalettensis (J. Beckmann, 2004) - (CLAUSILIIDAE)
- Tiberiola, syn of: Genus Tiberia T.A. de M. Monterosato, 1875 (PYRAMIDELLIDAE)
- Tibersyrnola, Genus Tibersyrnola C.R. Laws, 1937 (PYRAMIDELLIDAE)
- tibetanus, Aulacosphinctoides tibetanus Uhlig, 1910 † - (PERISPHINCTIDAE) (FOSSIL)
- tibetensis, Corbicula tibetensis B. Prashad, 1929 - (CYRENIDAE)
- tibetica, Gervillaria tibetica Yin & J. Grant-Mackie, 2005 † - (BAKEVELLIIDAE) (FOSSIL)
- tibetica, Liostrea tibetica Yin & McRoberts, 2006 † - (OSTREIDAE) (FOSSIL)
- tibetica, Janeia tibetica C. Chen, 1982 † - (SOLEMYIDAE) (FOSSIL)
- tibeticum, Ophiceras tibeticum (Griesbach, 1880 †) - (DIENEROCERATIDAE) (FOSSIL)
- tibeticum, Psiloceras tibeticum Yin & al., 2007 † - (PSILOCERATIDAE) (FOSSIL)
- tibeticus, Pseudomonotis tibeticus C. Chen, 1982 † - (PSEUDOMONOTIDAE) (FOSSIL)
- tibeticus, Schizodus tibeticus H.X. Liu & Cui, 1983 † - (SCHIZODIDAE) (FOSSIL)
- Tibetites, Genus Tibetites Mojsisovics , 1896 † (TIBETITIDAE) (FOSSIL)
- TIBETITIDAE Hyatt, 1900 † - Family (CEPHALOPODA-AMMONOIDEA [Subclass]-CERATITIDA [Order]-TRACHYCERATOIDEA [Superfamily]) (FOSSIL)
- tibia, Pomerantsoceras tibia Kröger, 2007 † - (GRACILOCERATIDAE) (FOSSIL)
- tibia, Pedicularia tibia L.R.L. Simone, 2005 - syn of: Pedicularia decussata A.A. Gould, 1855 - (PEDICULARIIDAE)
- Tibia, Genus Tibia P.F. Röding, 1798 (ROSTELLARIIDAE)
- tibiaeforme, Calliotectum tibiaeforme (J.T. Kuroda, 1931) - (VOLUTIDAE)
- tibiaeforme barneli, Calliotectum tibiaeforme barneli P. Bail, 2006 - (VOLUTIDAE)
- tibiaeforme dupreyae, Calliotectum tibiaeforme dupreyae (W.K. Emerson, 1985) - (VOLUTIDAE)
- tibiaeforme dupreyae, Calliotectum tibiaeforme dupreyae W.K. Emerson, 1985 - syn of: Calliotectum tibiaeforme dupreyae (W.K. Emerson, 1985) - (VOLUTIDAE)
- tibiaeforme johnsoni, Calliotectum tibiaeforme johnsoni (P. Bartsch, 1942) - (VOLUTIDAE)
- tibiaeforme williamsorum, Calliotectum tibiaeforme williamsorum (H.A. Rehder, 1972) - (VOLUTIDAE)
- tibiaeformis, Apiotoma tibiaeformis A.W.B. Powell, 1969 - syn of: Apiotoma tibiaformis A.W.B. Powell, 1969 - (COCHLESPIRIDAE)
- tibiaformis, Apiotoma tibiaformis A.W.B. Powell, 1969 - (COCHLESPIRIDAE)
- tibiaformis sibukoensis, Apiotoma tibiaformis sibukoensis (A.W.B. Powell, 1969) - (COCHLESPIRIDAE)
- Tibialectus, syn of: Genus Gregariella T.A. de M. Monterosato, 1884 (MYTILIDAE)
- tibialis, Triphora tibialis F.P. Jousseaume, 1884 - syn of: Euthymella elegans (R.B. Hinds, 1843) - (TRIPHORIDAE)
- tibialis, Euthymia tibialis F.P. Jousseaume, 1884 - syn of: Euthymella elegans (R.B. Hinds, 1843) - (TRIPHORIDAE)
- tibiana, Neohaustator fortilirata tibiana (S. Nomura, 1940) - (TURRITELLIDAE)
- Tibiaporrhais, Genus Tibiaporrhais Elder, 1990 † (APORRHAIDAE) (FOSSIL)
- tibicen, Rissoina tibicen J.C. Melvill, 1912 - (RISSOINIDAE)
- Tibichoanoceras, Genus Tibichoanoceras Kröger , 2008 † (ORTHOCERATIDAE) (FOSSIL)
- tibichoanum, Tibichoanoceras tibichoanum Kröger, 2008 † - (ORTHOCERATIDAE) (FOSSIL)
- tibidiensis, Hanusispira tibidiensis (Blodgett & al., 1999 †) - (LOPHOSPIRIDAE) (FOSSIL)
- tibidiensis, Finisterella tibidiensis Blodgett & al., 1999 † - syn of: Hanusispira tibidiensis (Blodgett & al., 1999 †) - (LOPHOSPIRIDAE) (FOSSIL)
- Tibiella, Genus Tibiella Meyer, 1884 † (THECOSOMATA (UNASSIGNED)) (FOSSIL)
- Tibiochilus, Genus Tibiochilus Eames, 1952 † (ROSTELLARIIDAE) (FOSSIL)
- Tiburns, syn of: Genus Tiburnus De Gregorio, 1893 † (SOLARIELLIDAE) (FOSSIL)
- Tiburnus, Genus Tiburnus De Gregorio, 1893 † (SOLARIELLIDAE) (FOSSIL)
- tiburonense, Epitonium tiburonense W.J. Clench & H. Turner, 1952 - (EPITONIIDAE)
- tiburonensis, Vitrinella tiburonensis J.W. Durham, 1942 - (TORNIDAE)
- tiburtina, Ambigua signata tiburtina (E.C. Von Martens, 1899) - (HELICIDAE)
- tica, Mexichromis tica T.M. Gosliner, J.A. Ortea & Á. Valdés, 2004 - (CHROMODORIDIDAE)
- tica, Ticofurcilla tica (J. Espinosa & J.A. Ortea, 2000) - (CYSTISCIDAE)
- ticaga, Gundlachia ticaga (Er. Marcus & Ev. Marcus, 1962) - (PLANORBIDAE)
- ticaonica, Helicostyla ticaonica W.J. Broderip, 1841 - (BRADYBAENIDAE)
- ticaonica, Diodora ticaonica L.A. Reeve, 1850 - (FISSURELLIDAE)
- ticaonica, Nebularia ticaonica L.A. Reeve, 1844 - (MITRIDAE)
- ticaonica, Daphnella ticaonica (L.A. Reeve, 1845) - (RAPHITOMIDAE)
- ticaonica, Taranis ticaonica A.W.B. Powell, 1967 - (RAPHITOMIDAE)
- ticaonica, Eucyclotoma ticaonica L.A. Reeve, 1845 - syn of: Daphnella ticaonica (L.A. Reeve, 1845) - (RAPHITOMIDAE)
- ticaonica, Vesicomya ticaonica W.H. Dall, 1908 - syn of: Pliocardia indica (E.A. Smith, 1904) - (VESICOMYIDAE)
- ticaonica iloilona, Helicostyla ticaonica iloilona M. Smith, 1932 - (BRADYBAENIDAE)
- ticaonica modesta, Helicostyla ticaonica modesta O.F. von Möllendorff, 1898 - (BRADYBAENIDAE)
- ticaonicum, Calliostoma ticaonicum (A. Adams, 1851) - (CALLIOSTOMATIDAE)
- ticaonicus, Donax ticaonicus S.C.T. Hanley, 1845 - (DONACIDAE)
- ticaonicus, Hipponix ticaonicus G.B. II Sowerby, 1846 - (HIPPONICIDAE)
- ticaonicus, Turbo ticaonicus L.A. Reeve, 1842 - syn of: Turbo bruneus L.A. Reeve, 1848 - (TURBINIDAE)
- tichanovichi, Tumidimytilus tichanovichi J. Makiyama, 1934 † - (MYTILIDAE) (FOSSIL)
- tichanovitchi, Tumidimytilus tichanovitchi (J. Makiyama, 1934 †) - (MYTILIDAE) (FOSSIL)
- Tichkaella, Genus Tichkaella Geyer, 1986 † (COREOSPIRIDAE) (FOSSIL)
- tichkaensis, Marocella tichkaensis D. Geyer, 1986 † - syn of: Marocella mira D. Geyer, 1986 † - (MAROCELLIDAE) (FOSSIL)
- tichobates, Delima blanda tichobates (L. Pfeiffer, 1868) - (CLAUSILIIDAE)
- Tichogonia, syn of: Genus Dreissena P.J. Van Beneden, 1835 (DREISSENIDAE)
- tichomirovi, Dicricoconus tichomirovi (Lyashenko, 1959 †) - (DICRICOCONIDAE) (FOSSIL)
- tichostoma, Volvidens tichostoma (L. Pfeiffer, 1839) - (SAGDIDAE)
- tichyi, Stuorilda tichyi K. Bandel, 1995 † - (AMPEZZANILDIDAE) (FOSSIL)
- ticinensis, Theodoxus ticinensis A. Villa, 1841 - syn of: Theodoxus fluviatilis (C. Linnaeus, 1758) - (NERITIDAE)
- ticinensis, Phragmoteuthis ticinensis Rieber, 1970 † - (PHRAGMOTEUTHIDIDAE) (FOSSIL)
- Ticinites, Genus Ticinites Rieber, 1973 † (DANUBITIDAE) (FOSSIL)
- Ticocystiscus, Genus Ticocystiscus J. Espinosa & J.A. Ortea, 2002 (CYSTISCIDAE)
- Ticofurcilla, Genus Ticofurcilla J. Espinosa & J.A. Ortea, 2002 (CYSTISCIDAE)
- ticurelatus, Astandes ticurelatus (J. Gründel, 2001 †) - (PSEUDOTRITONIIDAE) (FOSSIL)
- tidepolensis, Helicostyla satyrus tidepolensis (P. Bartsch, 1919) - (BRADYBAENIDAE)
- tidmoorense, Kosmoceras tidmoorense Arkell, 1939 † - (KOSMOCERATIDAE) (FOSSIL)
- tiechei, Pseudogregoryceras tiechei Jeannet, 1951 † - (ASPIDOCERATIDAE) (FOSSIL)
- tiedemani, Hastula tiedemani R.D. Burch, 1965 - (TEREBRIDAE)
- Tiedemannia, syn of: Genus Gleba P. Forsskål, 1776 (CYMBULIIDAE)
- tieensis, Joculator tieensis Cecalupo & Perugia, 2017 - (CERITHIOPSIDAE)
- tieni, Ptychomphalus tieni Yin, 1932 † - (PTYCHOMPHALIDAE) (FOSSIL)
- Tienoceras, Genus Tienoceras Zhao, 1954 † (SPHAERORTHOCERATIDAE) (FOSSIL)
- tienshanensis, Lophospira tienshanensis Yü, 1961 † - syn of: Lophospira milleri (Miller, 1877 †) - (LOPHOSPIRIDAE) (FOSSIL)
- tienshanica, Hanusispira tienshanica Gubanov & al., 1995 † - syn of: Hanusispira confinis (J. Perner, 1907 †) - (LOPHOSPIRIDAE) (FOSSIL)
- tientsinensis, Aculamprotula tientsinensis (J.C.H. Crosse & E.O. Debeaux, 1863) - (UNIONIDAE)
- tientungense, Submeekoceras tientungense Chao, 1959 † - syn of: Submeekoceras mushbachanum (White, 1879 †) - (ARCTOCERATIDAE) (FOSSIL)
- tientungense, Clypeoceras tientungense Chao, 1959 † - syn of: Nanningites tientungense (Chao, 1959 †) - (CLYPEOCERATIDAE) (FOSSIL)
- tientungense, Dieneroceras tientungense (Chao, 1959 †) - (COLUMBITIDAE) (FOSSIL)
- tientungense, Nanningites tientungense (Chao, 1959 †) - (PROPTYCHITIDAE) (FOSSIL)
- tiesenhanseni, Opisthostoma tiesenhanseni (E.A. Smith, 1894) - (DIPLOMMATINIDAE)
- tiesenhauseni, Charpentieria clavata tiesenhauseni (P.V. Gredler, 1885) - (CLAUSILIIDAE)
- tiesenhauseni, Donax tiesenhauseni H.B. Preston, 1908 - syn of: Donax cuneatus C. Linnaeus, 1758 - (DONACIDAE)
- tiesenhauseni, Chilostoma tiesenhauseni P.V. Gredler, 1889 - syn of: Faustina illyrica tiesenhauseni (P.V. Gredler, 1889) - (HELICIDAE)
- tiesenhauseni, Faustina illyrica tiesenhauseni (P.V. Gredler, 1889) - (HELICIDAE)
- tiesseni, Edmondia tiesseni Frech, 1911 † - (EDMONDIIDAE) (FOSSIL)
- tietensis, Potamolithus tietensis H.A. Pilsbry, 1925 - (LITHOGLYPHIDAE)
- tietzei, Coelostylina tietzei E.A.L. Kittl, 1894 † - (COELOSTYLINIDAE) (FOSSIL)
- tietzei, Lithoconus tietzei Hoernes & Auinger, 1879 † - (CONIDAE) (FOSSIL)
- tietzei, Marticia tietzei (M. von Neumayr, 1880 †) - (HYDROBIIDAE) (FOSSIL)
- tietzei, Eunema tietzei E.A.L. Kittl, 1894 † - (LOPHOSPIRIDAE) (FOSSIL)
- tietzei, Stacheoceras tietzei C. Gemmellaro, 1887 † - (NEOSTACHEOCERATIDAE) (FOSSIL)
- tietzei, Sowerbyceras tietzei Till, 1910 † - (PHYLLOCERATIDAE) (FOSSIL)
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