- Thaanumella, Genus Thaanumella W.J. Clench, 1946 (ASSIMINEIDAE)
- thaanumi, Achatinella thaanumi H.A. Pilsbry & C.M. Cooke, 1914 - (ACHATINELLIDAE)
- thaanumi, Tornatellaria thaanumi C.M. Cooke & H.A. Pilsbry, 1915 - (ACHATINELLIDAE)
- thaanumi, Pupa thaanumi H.A. Pilsbry, 1917 - syn of: Pupa affinis (A. Adams, 1855) - (ACTEONIDAE)
- thaanumi, Amastra thaanumi A. Hyatt & H.A. Pilsbry, 1911 - (AMASTRIDAE)
- thaanumi, Carelia paradoxa thaanumi C.M. Cooke, 1931 - (AMASTRIDAE)
- thaanumi, Clivipollia thaanumi H.A. Pilsbry & M.V. Brian, 1918 - syn of: Engina costata W.H. Pease, 1860 - (BUCCINIDAE)
- thaanumi, Satsuma moellendorffiana thaanumi H.A. Pilsbry, 1924 - (CAMAENIDAE)
- thaanumi, Frigidocardium thaanumi (H.A. Pilsbry, 1921) - (CARDIIDAE)
- thaanumi, Cardita thaanumi W.H. Dall, P. Bartsch & H.A. Rehder, 1938 - syn of: Cardita excisa R.A. Philippi, 1847 - (CARDITIDAE)
- thaanumi, Cerithium thaanumi H.A. Pilsbry & E.G. Vanatta, 1905 - syn of: Cerithium interstriatum G.B. II Sowerby, 1855 - (CERITHIIDAE)
- thaanumi, Kaliella thaanumi C.M.F. Ancey, 1904 - (CHRONIDAE)
- thaanumi, Lithoconus thaanumi J.S. Schwengel, 1955 - syn of: Gradiconus regularis (G.B. I Sowerby, 1833) - (CONIDAE)
- thaanumi, Costellaria thaanumi H.A. Pilsbry, 1920, 1921 - syn of: Vexillum interstriatum (G.B. II Sowerby, 1870) - (COSTELLARIIDAE)
- thaanumi, Cookeconcha thaanumi (H.A. Pilsbry & E.G. Vanatta, 1905) - (ENDODONTIDAE)
- thaanumi, Euconulus thaanumi C.M.F. Ancey, 1904 - (EUCONULIDAE)
- thaanumi, Echineulima thaanumi (H.A. Pilsbry, 1921) - (EULIMIDAE)
- thaanumi, Peristernia thaanumi H.A. Pilsbry & E.J. Bryan, 1901 - (FASCIOLARIIDAE)
- thaanumi, Leiochasmea thaanumi (H.A. Pilsbry, 1921) - (GALEOMMATIDAE)
- thaanumi, Hydrobia thaanumi H.A. Pilsbry, 1900 - (HYDROBIIDAE)
- thaanumi, Codakia thaanumi H.A. Pilsbry, 1918 - (LUCINIDAE)
- thaanumi, Mactra thaanumi W.H. Dall, P. Bartsch & H.A. Rehder, 1938 - (MACTRIDAE)
- thaanumi, Vexilla thaanumi H.A. Pilsbry, 1921 - syn of: Vexilla vexillum (J.F. Gmelin, 1791) - (MURICIDAE)
- thaanumi, Ostrea thaanumi W.H. Dall, P. Bartsch & H.A. Rehder, 1938 - syn of: Parahyotissa numisma (J.B.P.A. Lamarck, 1819) - (OSTREIDAE)
- thaanumi, Mirapecten mirificus thaanumi (W.H. Dall, P. Bartsch & H.A. Rehder, 1939) - (PECTINIDAE)
- thaanumi, Tricolia thaanumi H.A. Pilsbry, 1917 - syn of: Tricolia variabilis (W.H. Pease, 1861) - (PHASIANELLIDAE)
- thaanumi, Turbonilla thaanumi H.A. Pilsbry & E.G. Vanatta, 1908 - (PYRAMIDELLIDAE)
- thaanumi, Succinea thaanumi C.M.F. Ancey, 1899 - (SUCCINEIDAE)
- thaanumi, Terebra thaanumi H.A. Pilsbry, 1921 - syn of: Oxymeris costellifera (W.H. Pease, 1869) - (TEREBRIDAE)
- thaanumi, Duplicaria thaanumi H.A. Pilsbry, 1921 - syn of: Oxymeris costellifera (W.H. Pease, 1869) - (TEREBRIDAE)
- thaanumi, Triphora thaanumi E.A. Kay, 1979 - (TRIPHORIDAE)
- thaanumi, Trivirostra thaanumi C.N. Cate, 1979 - (TRIVIIDAE)
- thaanumi, Truncatella thaanumi W.J. Clench & H. Turner, 1948 - (TRUNCATELLIDAE)
- thaanumi, Samarangia thaanumi J.T. Kuroda, 1945 - syn of: Samarangia quadrangularis (A. Adams & L.A. Reeve, 1850) - (VENERIDAE)
- thaanumi, Lyropupa thaanumi C.M. Cooke & H.A. Pilsbry, 1920 - (VERTIGINIDAE)
- thaanumi, Nesopupa thaanumi C.M.F. Ancey, 1904 - (VERTIGINIDAE)
- thaanumi insularis, Truncatella thaanumi insularis W.J. Clench & H. Turner, 1948 - (TRUNCATELLIDAE)
- Thaanumia, Subgenus Leptachatina (Thaanumia) C.M.F. Ancey, 1899 (AMASTRIDAE)
- thaanumiana, Partulina thaanumiana H.A. Pilsbry, 1913 - (ACHATINELLIDAE)
- thaanumiana, Mitra thaanumiana H.A. Pilsbry, 1920, 1921 - syn of: Mitra coffea G.H. Schubert & J.A. Wagner, 1829 - (MITRIDAE)
- thaca, Chama thaca J.I. Molina, 1782 - syn of: Leukoma thaca (Molina, 1782) - (CHAMIDAE)
- thaca, Leukoma thaca (Molina, 1782) - (VENERIDAE)
- thaca, Protothaca thaca J.I. Molina, 1782 - syn of: Leukoma thaca (Molina, 1782) - (VENERIDAE)
- thachi, Metula thachi K. Fraussen & Y.F. Huang, 2011 - (BUCCINIDAE)
- thachi, Calliostoma thachi A. Alf & D. Stratmann, 2007 - (CALLIOSTOMATIDAE)
- thachi, Amphidromus thachi M. Huber, 2015 - (CAMAENIDAE)
- thachi, Semicassis thachi K. Kreipl, A. Alf & T. Eggeling, 2006 - (CASSIDAE)
- thachi, Collonista thachi Y.F. Huang, C.C. Fu & G.T. Poppe, 2016 - (COLLONIIDAE)
- thachi, Spiraculum thachi (F. Huber, 2017) - (CYCLOPHORIDAE)
- thachi, Mitra thachi H. Turner, 2007 - (MITRIDAE)
- thachi, Nassarius thachi H. Dekker, 2004 - (NASSARIIDAE)
- thachi, Turbonilla thachi (E. Saurin, 1959) - (PYRAMIDELLIDAE)
- thachi, Solen thachi R. von Cosel, 2002 - (SOLENIDAE)
- thachi, Fulgoraria rupestris thachi P. Bail & M. Chino, 2010 - (VOLUTIDAE)
- thachorum, Nassarius thachorum Dekker, Kool & van Gemert, 2016 - (NASSARIIDAE)
- thackergeigeri, Axinulus thackergeigeri P.H. Valentich-Scott & E.V. Coan, 2012 - (THYASIRIDAE)
- thackwayi, Acanthochitona thackwayi E.A. Ashby, 1924 - (ACANTHOCHITONIDAE)
- thackwayi, Anadara thackwayi T. Iredale, 1927 - syn of: Tegillarca granosa (C. Linnaeus, 1758) - (ARCIDAE)
- thackwayi, Glycymeris thackwayi T. Iredale, 1931 - syn of: Glycymeris striatularis (J.B.P.A. Lamarck, 1819) - (GLYCYMERIDIDAE)
- Thacombaua, syn of: Subgenus Partula (Thakombaua) H.A. Pilsbry, 1909 (PARTULIDAE)
- thaerella, Yoldiella thaerella I.J. Killeen & H. Turner, 2009 - (YOLDIIDAE)
- thagastensis, Pseudothersitea thagastensis Savornin, 1914 † - (THERSITEIDAE) (FOSSIL)
- thagus, Laevityphis thagus A.A. Olsson, 1930 † - (MURICIDAE) (FOSSIL)
- THAIDIDAE - syn of Family: MURICIDAE
- thaii, Tiberia thaii E. Saurin, 1959 - (PYRAMIDELLIDAE)
- thailandensis, Khumerspira thailandensis A. Nützel & Ketwetsuriya, 2016 † - (BELLEROPHONTIDAE) (FOSSIL)
- thailandensis, Glabrocingulum thailandensis A. Nützel & Ketwetsuriya, 2016 † - (GOSSELETINIDAE) (FOSSIL)
- thailandensis, Reticunassa thailandensis Galindo, Kool & Dekker, 2017 - (NASSARIIDAE)
- thailandica, Teraia thailandica G.A. Solem, 1966 - (ARIOPHANTIDAE)
- thailandica, Ceritoturris thailandica E. Robba, S.I. Di Geronimo, N. Chaimanee & al., 2007 - (HORAICLAVIDAE)
- thailandica, Costosyrnola thailandica E. Robba, S.I. Di Geronimo, N. Chaimanee & al., 2004 - (PYRAMIDELLIDAE)
- thailandicum, Carychium thailandicum S. Panha & Burch, 2002 - (ELLOBIIDAE)
- thailandicus, Idiosepius thailandicus C. Chotiyaputta, T.A. Okutani & S. Chaitiamvong, 1991 - (IDIOSEPIIDAE)
- thailandicus, Solen thailandicus R. von Cosel, 2002 - (SOLENIDAE)
- thailandis, Darioconus crocatus thailandis A.J. Da Motta, 1978 - (CONIDAE)
- thailandis, Haliotis thailandis H. Dekker & S. Patamakanthin, 2001 - (HALIOTIDAE)
- thailandis, Ceritoturris thailandis E. Robba & al., 2007 - syn of: Ceritoturris thailandica E. Robba, S.I. Di Geronimo, N. Chaimanee & al., 2007 - (HORAICLAVIDAE)
- Thairoplax, Genus Thairoplax Cherns , 1998 † (ALASTEGIIDAE) (FOSSIL)
- thais, Cirsotrema thais M.E.A. de Boury, 1912 † - syn of: Cirsotrema crassicostatum (G.P. Deshayes, 1839 †) - (EPITONIIDAE) (FOSSIL)
- Thais, Genus Thais P.F. Röding, 1798 (MURICIDAE)
- thaisa, Therasia thaisa F.W. Hutton, 1883 - (CHAROPIDAE)
- Thaisella, Subgenus Thais (Thaisella) W.J. Clench, 1947 (MURICIDAE)
- Thaisella, syn of: Genus Thais P.F. Röding, 1798 (MURICIDAE)
- thaisensis, Spiralix thaisensis H. Girardi, 2009 - (MOITESSIERIIDAE)
- Thaisiella, syn of: Subgenus Thais (Thaisella) W.J. Clench, 1947 (MURICIDAE)
- thaitranbaii, Pupina thaitranbaii Do, 2017 - (PUPINIDAE)
- Thaitropis, Genus Thaitropis A.A. Schileyko, 2004 (BRADYBAENIDAE)
- thakal, Shandongolithes thakal Kruse, 2002 † - (CARDIOLITHIDAE) (FOSSIL)
- thakhekensis, Amphidromus thakhekensis Thach & F. Huber, 2017 - (CAMAENIDAE)
- thakkholensis, Juvavites thakkholensis Krystyn, 1982 † - (JUVAVITIDAE) (FOSSIL)
- thakombau, Turbonilla thakombau A. Peñas & E. Rolán, 2010 - (PYRAMIDELLIDAE)
- Thakombaua, Subgenus Partula (Thakombaua) H.A. Pilsbry, 1909 (PARTULIDAE)
- Thala, Genus Thala H. Adams & A. Adams, 1853 (COSTELLARIIDAE)
- thalaea, Antiplanes thalaea (W.H. Dall, 1902) - (PSEUDOMELATOMIDAE)
- thalamega, Zoila jeaniana thalamega F.Jr. Lorenz, 2002 - (CYPRAEIDAE)
- thalaoides, Mitromorpha thalaoides M. Chino & P. Stahlschmidt, 2014 - (MITROMORPHIDAE)
- Thalassacmea, syn of: Genus Acmaea J.F. von Eschscholtz, 1833 (ACMAEIDAE)
- thalassae, Cylindriscala thalassae P. Bouchet & A. Warén, 1986 - (EPITONIIDAE)
- thalassae, Fusceulima thalassae P. Bouchet & A. Warén, 1986 - (EULIMIDAE)
- thalassae, Limatula thalassae J.A. Allen, 2004 - (LIMIDAE)
- thalassae, Frigidoalvania thalassae P. Bouchet & A. Warén, 1993 - (RISSOIDAE)
- thalassemicola, Sagamiscintilla thalassemicola (T. Habe, 1962) - (GALEOMMATIDAE)
- Thalassia, syn of: Genus Nitor G.P.L.K. Gude, 1911 (HELICARIONIDAE)
- thalassiarchi, Hydatina thalassiarchi A. Adams, 1855 - syn of: Aplustrum amplustre (C. Linnaeus, 1758) - (APLUSTRIDAE)
- thalassiarchi, Bulla thalassiarchi W. Martini - syn of: Aplustrum amplustre (C. Linnaeus, 1758) - (BULLIDAE)
- thalassiarchus, Virgiconus thalassiarchus (G.B. II Sowerby, 1834) - (CONIDAE)
- thalassiarchus, Thalassiconus thalassiarchus G.B. II Sowerby, 1834 - syn of: Virgiconus thalassiarchus (G.B. II Sowerby, 1834) - (CONIDAE)
- thalassiarchus azona, Conus thalassiarchus azona E. Wils, 1972 - syn of: Virgiconus thalassiarchus (G.B. II Sowerby, 1834) - (CONIDAE)
- thalassiarchus depriesteri, Conus thalassiarchus depriesteri E. Wils, 1972 - syn of: Virgiconus thalassiarchus (G.B. II Sowerby, 1834) - (CONIDAE)
- thalassiarchus elevata, Conus thalassiarchus elevata E. Wils, 1972 - syn of: Virgiconus thalassiarchus (G.B. II Sowerby, 1834) - (CONIDAE)
- thalassiarchus ikatt, Conus thalassiarchus ikatt T. Shikama, 1979 - syn of: Virgiconus thalassiarchus (G.B. II Sowerby, 1834) - (CONIDAE)
- thalassica, Pleurotomella thalassica W.H. Dall, 1919 - (RAPHITOMIDAE)
- thalassicola, Prunum thalassicola J. Espinosa, J.A. Ortea & R. Fernández-Garcés, 2007 - (MARGINELLIDAE)
- thalassicola, Eulithidium thalassicola R. Robertson, 1958 - (PHASIANELLIDAE)
- thalassicola, Tricolia thalassicola (R. Robertson, 1958) - syn of: Eulithidium thalassicola R. Robertson, 1958 - (PHASIANELLIDAE)
- Thalassiconus, Genus Thalassiconus J.K. Tucker & M.J. Tenorio, 2013 (CONIDAE)
- thalassina, Eobania thalassina A. Villa & J. Villa, 1841 - syn of: Eobania vermiculata (O.F. Müller, 1774) - (HELICIDAE)
- thalassinum, Parvamussium thalassinum (W.H. Dall, 1886) - (PROPEAMUSSIIDAE)
- thalassinus, Cryptoconus thalassinus (G. Rovereto, 1914 †) - (CONIDAE) (FOSSIL)
- thalassinus, Cyclopecten thalassinus (W.H. Dall, 1886) - (PROPEAMUSSIIDAE)
- Thalassiobia, syn of: Genus Hydrobia J.D.W. Hartmann, 1821 (HYDROBIIDAE)
- thalassium, Agnocardia thalassium (C.J. Maury, 1925 †) - (CARDIIDAE) (FOSSIL)
- thalassium, Trachycardium thalassium C.J. Maury, 1924 † - (CARDIIDAE) (FOSSIL)
- Thalassobia, Genus Thalassobia J.R. Bourguignat in J.F. Mabille, 1877 (COCHLIOPIDAE)
- Thalassoceras, Genus Thalassoceras Gemmellaro , 1887 † (THALASSOCERATIDAE) (FOSSIL)
- THALASSOCERATIDAE Hyatt, 1900 † - Family (CEPHALOPODA-AMMONOIDEA [Subclass]-GONIATITIDA [Order]-THALASSOCERATOIDEA [Superfamily]) (FOSSIL)
- thalassochromus, Amphidromus thalassochromus J.J. Vermeulen & D.J. Junau, 2007 - (CAMAENIDAE)
- Thalassocyon, Genus Thalassocyon K.H. Barnard, 1960 (FICIDAE)
- thalassogonus, Phacoides thalassogonus C.J. Maury, 1924 † - (LUCINIDAE) (FOSSIL)
- Thalassohelix, Subgenus Therasia (Thalassohelix) H.A. Pilsbry, 1892 (CHAROPIDAE)
- thalassoides, Delepinoceras thalassoides (Delepine, 1937 †) - (DELEPINOCERATIDAE) (FOSSIL)
- thalassoklusta, Ostrea thalassoklusta C.J. Maury, 1912 † - (OSTREIDAE) (FOSSIL)
- thalassoma, Glyphostoma thalassoma W.H. Dall, 1908 - (CLATHURELLIDAE)
- thalassomeli, Nassaria thalassomeli K. Fraussen & G.T. Poppe, 2007 - (NASSARIIDAE)
- Thalassoplanes, Genus Thalassoplanes W.H. Dall, 1908 (BUCCINIDAE)
- thalassoplekta, Venericardia thalassoplekta C.J. Maury, 1912 † - (CARDITIDAE) (FOSSIL)
- thalassopora, Glossodoris thalassopora (L.S.R. Bergh, 1879) - (CHROMODORIDIDAE)
- Thalassopterus, Genus Thalassopterus C. Kwietniewski, 1910 (CLIONIDAE)
- thalattius, Leptochiton thalattius P. Kaas & R.A. Van Belle, 1985 - (LEPTOCHITONIDAE)
- thalea, Antiplanes thalea W.H. Dall, 1902 - syn of: Antiplanes thalaea (W.H. Dall, 1902) - (PSEUDOMELATOMIDAE)
- thaleia, Caducifer thaleia H.A. Pilsbry & H.N. Lowe, 1932 - (BUCCINIDAE)
- thaleia, Venericardia thaleia C.J. Maury, 1924 † - (CARDITIDAE) (FOSSIL)
- Thaleia, Genus Thaleia A. Warén, 1979 (RISSOIDAE)
- thalensis, Eulimella thalensis E. Robba, S.I. Di Geronimo, N. Chaimanee & al., 2004 - (PYRAMIDELLIDAE)
- thalera, Lienardia thalera (J.C. Melvill & R. Standen, 1896) - (CLATHURELLIDAE)
- thalera, Mangelia thalera J.C. Melvill & R. Standen, 1896 - syn of: Lienardia thalera (J.C. Melvill & R. Standen, 1896) - (MANGELIIDAE)
- thaleroptyx, Hemiphaedusoides thaleroptyx (O.F. von Möllendorff, 1882) - (CLAUSILIIDAE)
- thalerus, Chlamys thalerus C.J. Maury, 1924 † - (PECTINIDAE) (FOSSIL)
- Thalessa, Genus Thalessa A. Adams, 1853 (MURICIDAE)
- Thalestris, syn of: Genus Roseniella K.H.J. Thiele, 1931 (CLAUSILIIDAE)
- thalestris, Dioscuria thalestris (W.A. Lindholm, 1927) - (HYGROMIIDAE)
- thalia, Kalidos thalia (W.L.H. Dohrn, 1882) - (ARIOPHANTIDAE)
- thalia, Ptychosphaera thalia (J.W. Hall, 1859 †) - (BELLEROPHONTIDAE) (FOSSIL)
- thalia, Anachis thalia W.H. Turton, 1939 - syn of: Decipifus consanguineus (G.B. III Sowerby, 1897) - (COLUMBELLIDAE)
- thalia, Plesiocystiscus thalia (W.H. Turton, 1932) - (CYSTISCIDAE)
- thalia, Everettia thalia E.A. Smith, 1895 - (DYAKIIDAE)
- thalia, Eatoniella thalia (P. Bartsch, 1915) - (EATONIELLIDAE)
- thalia, Amaea thalia P. Bartsch, 1915 - syn of: Amaea minor (G.B. II Sowerby, 1873) - (EPITONIIDAE)
- thalia, Melanella thalia P. Bartsch, 1915 - (EULIMIDAE)
- thalia, Mangilia thalia W.H. Turton, 1932 - syn of: Decipifus consanguineus (G.B. III Sowerby, 1897) - (MANGELIIDAE)
- thalia, Charitodoron thalia J.R. le B. Tomlin, 1932 - (MITRIDAE)
- thalia, Modiolus thalia W.H. Turton, 1932 - syn of: Arcuatula capensis (C.F.F. von Krauss, 1848) - (MYTILIDAE)
- thalia, Partula thalia A. Garrett, 1884 - (PARTULIDAE)
- thalia, Cyclonema thalia Billings, 1857 † - (PLATYCERATIDAE) (FOSSIL)
- thalia, Odostomia thalia P. Bartsch, 1912 - (PYRAMIDELLIDAE)
- thalia, Daphnella thalia J.S. Schwengel, 1938 - syn of: Daphnella allemani (P. Bartsch, 1931) - (RAPHITOMIDAE)
- thalia, Alvania thalia C. De Stefani & D. Pantanelli, 1888 † - (RISSOIDAE) (FOSSIL)
- thalia, Gibbula cicer thalia P. Bartsch, 1915 - (TROCHIDAE)
- thaliae, Volvarina thaliae J. Espinosa & J.A. Ortea, 2015 - (MARGINELLIDAE)
- Thaliota, syn of: Genus Thalotia J.E. Gray, 1840 (TROCHIDAE)
- Thallassoceras, Genus Thallassoceras † (GONIATITIDA (UNASSIGNED)) (FOSSIL)
- thallavignesi, Wateletia thallavignesi (Doncieux, 1908 †) - (APORRHAIDAE) (FOSSIL)
- thallavignesi, Crassatella thallavignesi G.P. Deshayes, 1857 † - (CRASSATELLIDAE) (FOSSIL)
- Thallepus, syn of: Genus Dolabrifera J.E. Gray, 1847 (APLYSIIDAE)
- Thallicera, syn of: Genus Amphibola H.C.F. Schumacher, 1817 (AMPHIBOLIDAE)
- thallus, Cadulus thallus (T.A. Conrad, 1834 †) - (GADILIDAE) (FOSSIL)
- thalmanni, Pegophysema thalmanni E.S. Marks, 1951 † - (LUCINIDAE) (FOSSIL)
- thalmanni, Murexsul thalmanni E.H. Vokes, 1968 - (MURICIDAE)
- thalmanni, Palaeophyllites thalmanni Renz & Renz, 1948 † - syn of: Palaeophyllites steinmanni Welter, 1922 † - (USSURITIDAE) (FOSSIL)
- Thalotia, Genus Thalotia J.E. Gray, 1840 (TROCHIDAE)
- Thaluta, Genus Thaluta G. Rosenberg & P. Callomon, 2003 (COSTELLARIIDAE)
- thalycra, Iredalea thalycra (J.C. Melvill & R. Standen, 1896) - (DRILLIIDAE)
- Thambites, Genus Thambites Arkell, 1952 † (THAMBOCERATIDAE) (FOSSIL)
- Thamboceras, Genus Thamboceras Douvillé , 1916 † (THAMBOCERATIDAE) (FOSSIL)
- THAMBOCERATIDAE Arkell, 1952 † - Family (CEPHALOPODA-AMMONOIDEA [Subclass]-AMMONITIDA [Order]-STEPHANOCERATOIDEA [Superfamily]) (FOSSIL)
- thamnivaga, Helix thamnivaga J.F. Mabille - syn of: Arianta arbustorum (C. Linnaeus, 1758) - (HELICIDAE)
- thamnoica, Helix thamnoica D'Orbigny, 1835 - syn of: Scutalus thamnoicus (A.V.M.D. D'Orbigny, 1835) - (HELICIDAE)
- thamnoicus, Scutalus thamnoicus (A.V.M.D. D'Orbigny, 1835) - (BULIMULIDAE)
- thamnophila, Clausilia thamnophila J.R. Bourguignat, 1861 - syn of: Clausilia bidentata crenulata A. Risso, 1826 - (CLAUSILIIDAE)
- thamnoporus, Dendrochiton thamnoporus (S.S. Berry, 1911) - (LEPIDOCHITONIDAE)
- Thanamites, Genus Thanamites Diener , 1908 † (THANAMITIDAE) (FOSSIL)
- THANAMITIDAE Tozer, 1971 † - Family (CEPHALOPODA-AMMONOIDEA [Subclass]-CERATITIDA [Order]-NATHORSTITOIDEA [Superfamily]) (FOSSIL)
- thanasima, Hemicycla thanasima J.F. Mabille, 1883 - syn of: Hemicycla consobrina (A.E.J. Férussac, 1821) - (HELICIDAE)
- thandari, Leptochiton thandari B.I. Sirenko, 2001 - (LEPTOCHITONIDAE)
- Thanetinassa, Genus Thanetinassa Nuttall & J. Cooper, 1973 † (NASSARIIDAE) (FOSSIL)
- thangaensis, Turricula thangaensis E.W. Vredenburg, 1921 † - (CLAVATULIDAE) (FOSSIL)
- thanhhoaensis, Amphidromus thanhhoaensis Thach & Huber, 2016 - (CAMAENIDAE)
- thanhhoaensis, Camaena thanhhoaensis Thach, 2016 - (CAMAENIDAE)
- thanus, Turbo petholatus thanus H.S. Ladd, 1934 - (TURBINIDAE)
- Thapsia, Genus Thapsia J.A. Albers, 1860 (UROCYCLIDAE)
- thapsiae, Cythara thapsiae J.J. Oberling, 1970 - (MANGELIIDAE)
- Thapsiella, syn of: Genus Alvania A. Risso, 1826 (RISSOIDAE)
- Thapsiella, syn of: Genus Thapsia J.A. Albers, 1860 (UROCYCLIDAE)
- Thapsinella, syn of: Genus Thapsia J.A. Albers, 1860 (UROCYCLIDAE)
- thapsinus, Liguus vittatus thapsinus M.L. Jaume, 1952 - (ORTHALICIDAE)
- tharfieldensis, Gulella tharfieldensis (J.C. Melvill & J.H. Ponsonby, 1893) - (STREPTAXIDAE)
- Tharsiella, syn of: Genus Cirsonella G.F. Angas, 1877 (SKENEIDAE)
- Tharsis, syn of: Genus Cirsonella G.F. Angas, 1877 (SKENEIDAE)
- thasia, Macedonica thasia H. Nordsieck, 1977 - (CLAUSILIIDAE)
- thasia, Helicella thasia (P.L. Reischütz, 1983) - (HYGROMIIDAE)
- thasia, Vitrea thasia F. Riedel & P.L. Reischütz, 1983 - (PRISTILOMATIDAE)
- thasia nordsiecki, Macedonica thasia nordsiecki W.A. Fauer, 1985 - (CLAUSILIIDAE)
- Thasiogenes, Subgenus Balcanodiscus (Thasiogenes) A. Riedel, 1988 (ZONITIDAE)
- thatcheri, Cypraea thatcheri J.C. Cox, 1869 - syn of: Zoila venusta (G.B. II Sowerby, 1847) - (CYPRAEIDAE)
- thatcheri, Zoila venusta thatcheri (G.B. Sowerby, 1846) - (CYPRAEIDAE)
- thatcheri, Cymbiola thatcheri (F. McCoy, 1868) - (VOLUTIDAE)
- thatcheri, Cymbiolacca thatcheri G.F. Angas, 1870 - syn of: Cymbiola thatcheri (F. McCoy, 1868) - (VOLUTIDAE)
- Thatcheria, Genus Thatcheria G.F. Angas, 1877 (RAPHITOMIDAE)
- thatcheria, Rissoina thatcheria C.K. Chang & W.L. Wu, 2004 - (RISSOINIDAE)
- Thatcheriasyrinx, Genus Thatcheriasyrinx A. Powell, 1969 (RAPHITOMIDAE)
- Thatcherina, Genus Thatcherina J.L. Vera-Peláez, 1998 (RAPHITOMIDAE)
- thateensis, Wladislawia thateensis P. Subai, 2012 - (HELICIDAE)
- thatkeana, Bithynia thatkeana J.F. Mabille - (BITHYNIIDAE)
- thatkheana, Hemiphaedusa thatkheana (A.R.J.B. Bavay & P. Dautzenberg, 1899) - (CLAUSILIIDAE)
- thatkheana ptychostoma, Hemiphaedusa thatkheana ptychostoma H. Nordsieck, 2011 - (CLAUSILIIDAE)
- thatkheana splendida, Hemiphaedusa thatkheana splendida H. Nordsieck, 2011 - (CLAUSILIIDAE)
- thauma, Anadara thauma C.J. Maury, 1925 † - (ARCIDAE) (FOSSIL)
- thaumalea, Hemicycla thaumalea (J.F. Mabille, 1882) - (HELICIDAE)
- thaumasia, Triloba thaumasia (R. Sturany, 1907) - (CLAUSILIIDAE)
- thaumasia, Pseudoneaera thaumasia R. Sturany, 1901 - (CUSPIDARIIDAE)
- thaumasia, Corbicula thaumasia P.M. Pallary, 1909 - syn of: Corbicula fluminalis (O.F. Müller, 1774) - (CYRENIDAE)
- thaumasia, Nassa thaumasia R. Sturany, 1900 - syn of: Tritia casta (A.A. Gould, 1850) - (NASSARIIDAE)
- thaumasia, Rissoina thaumasia J.C. Melvill & R. Standen, 1898 - syn of: Rissoina antoni thaumasia (J.C. Melvill & R. Standen, 1898) - (RISSOINIDAE)
- thaumasia, Rissoina antoni thaumasia (J.C. Melvill & R. Standen, 1898) - (RISSOINIDAE)
- Thaumasia, syn of: Genus Eucalodium J.C.H. Crosse & P. Fischer, 1868 (UROCOPTIDAE)
- thaumasia, Lyropupa thaumasia C.M. Cooke & H.A. Pilsbry, 1920 - (VERTIGINIDAE)
- thaumasia dardanorum, Triloba thaumasia dardanorum (A.J. Wagner, 1919) - (CLAUSILIIDAE)
- thaumasia faueri, Triloba thaumasia faueri H. Nordsieck, 1972 - (CLAUSILIIDAE)
- thaumasia korabensis, Triloba thaumasia korabensis (A.J. Wagner, 1919) - (CLAUSILIIDAE)
- thaumasia talevi, Triloba thaumasia talevi I. Dedov & E. Neubert, 2002 - (CLAUSILIIDAE)
- thaumasius, Maafu thaumasius G.A. Solem, 1983 - (CHAROPIDAE)
- thaumasius, Nassarius thaumasius (R. Sturany, 1900) - (NASSARIIDAE)
- thaumasta, Cooperellopsis thaumasta Woodring 1925 † - (CARDIIDA (UNASSIGNED)) (FOSSIL)
- thaumasta, Acriclymenia thaumasta Bogoslovsky, 1975 † - (CARINOCLYMENIIDAE) (FOSSIL)
- thaumasta, Arxellia thaumasta C. Vilvens, S.T. Williams & D.G. Herbert, 2014 - (SOLARIELLIDAE)
- Thaumastiella, Subgenus Thaumastus (Thaumastiella) W.K. Weyrauch, 1956 (MEGASPIRIDAE)
- thaumastocheir, Grimpella thaumastocheir C.W. Robson, 1928 - (OCTOPODIDAE)
- thaumastopsis, Teretiopsis thaumastopsis (P. Dautzenberg & H. Fischer, 1896) - (RAPHITOMIDAE)
- thaumastopsis, Pleurotoma thaumastopsis P. Dautzenberg & H. Fischer, 1896 - syn of: Teretiopsis thaumastopsis (P. Dautzenberg & H. Fischer, 1896) - (TURRIDAE)
- thaumastum, Oxintoceras thaumastum Kuzina, 1974 † - (INTOCERATIDAE) (FOSSIL)
- thaumastum, Neogeoceras thaumastum Ruzhentsev, 1976 † - (MEDLICOTTIIDAE) (FOSSIL)
- Thaumastus, Genus Thaumastus J.A. Albers, 1860 (MEGASPIRIDAE)
- thaumastus, Pecten thaumastus C.J. Maury, 1924 † - (PECTINIDAE) (FOSSIL)
- Thaumatodon, Genus Thaumatodon H.A. Pilsbry, 1893 (ENDODONTIDAE)
- Thaumatogulella, syn of: Subgenus Ptychotrema (Mirellia) K.H.J. Thiele, 1933 (STREPTAXIDAE)
- Thaumatolampas, syn of: Genus Lycoteuthis G.J. Pfeffer, 1900 (LYCOTEUTHIDAE)
- thaumatopoma, Parazaptyx thaumatopoma (H.A. Pilsbry, 1905) - (CLAUSILIIDAE)
- Thaumatoptyx, Genus Thaumatoptyx H.A. Pilsbry, 1908 (CLAUSILIIDAE)
- thaumatostoma, Clausilia thaumatostoma Y. Hirase, 1957 - (CLAUSILIIDAE)
- Thaumeledone, Genus Thaumeledone G.C. Robson, 1930 (OCTOPODIDAE)
- Thaumoctopus, Genus Thaumoctopus M.D. Norman & F.G. Hochberg, 2005 (OCTOPODIDAE)
- thayerae, Phos thayerae Smith, 1936 † - (NASSARIIDAE) (FOSSIL)
- thayeri, Strophiops thayeri C.J. Maynard & W.F. Clapp, 1921 - (CERIONIDAE)
- Thaymastoceras, Genus Thaymastoceras Zhuravleva, 1974 † (NAUTILIDA (UNASSIGNED)) (FOSSIL)
- thaynesiana, Leptochondria thaynesiana Girty, 1927 † - syn of: Leptochondria curtocardinalis (J.W. Hall & R.P. Whitfield, 1877 †) - (LEIOPECTINIDAE) (FOSSIL)
- thaynesiana, Monotis thaynesiana J.W. Hall & R.P. Whitfield, 1877 † - syn of: Leptochondria curtocardinalis (J.W. Hall & R.P. Whitfield, 1877 †) - (MONOTIDAE) (FOSSIL)
- thaynesianus, Neoschizodus thaynesianus Newell & Boyd, 1975 † - (MYOPHORIIDAE) (FOSSIL)
- thaytinitiensis, Carnevalea thaytinitiensis (E. Neubert & D. Van Damme, 2012 †) - (AMPULLARIIDAE) (FOSSIL)
- thaytinitiensis, Salalahia thaytinitiensis D. Kadolsky, M. Harzhauser & T.A. Neubauer, 2015 † - (HYDROBIIDAE) (FOSSIL)
- Thea, syn of: Subgenus Aegista (Plectotropis) E.C. Von Martens, 1860 (BRADYBAENIDAE)
- thea, Cerodrillia thea (W.H. Dall, 1884) - (DRILLIIDAE)
- thea, Mangelia thea K.H.J. Thiele, 1925 - syn of: Guraleus amplexus (A.A. Gould, 1860) - (MANGELIIDAE)
- thea, Odostomia thea P. Bartsch, 1912 - (PYRAMIDELLIDAE)
- thea, Tindaria thea W.H. Dall, 1908 - syn of: Neilonella atossa (W.H. Dall, 1908) - (TINDARIIDAE)
- thea carminura, Drillia thea carminura W.H. Dall, 1889 - syn of: Cerodrillia carminura (W.H. Dall, 1889) - (DRILLIIDAE)
- Theba, Genus Theba A. Risso, 1826 (HELICIDAE)
- thebaica, Tudicla thebaica Cuvillier, 1933 † - (TURBINELLIDAE) (FOSSIL)
- thebana, Isabellaria isabellina thebana (E.C. Von Martens, 1876) - (CLAUSILIIDAE)
- thebesensis, Paupospira thebesensis (Savage, 1913 †) - (LOPHOSPIRIDAE) (FOSSIL)
- Theca, syn of: Genus Hyolithes d'Eichwald , 1840 † (HYOLITHIDAE) (FOSSIL)
- theca, Lopha theca P.F. Röding, 1798 - syn of: Dendostrea folium (C. Linnaeus, 1758) - (OSTREIDAE)
- theca, Dendostrea theca P.F. Röding, 1798 - syn of: Dendostrea folium (C. Linnaeus, 1758) - (OSTREIDAE)
- theca, Sutilizona theca McLean, 1989 - (SUTILIZONIDAE)
- theca, Trapezoideus theca (W.H. Benson, 1862) - (UNIONIDAE)
- Thecacera, Genus Thecacera J. Fleming, 1828 (POLYCERIDAE)
- Thecalia, Genus Thecalia H. Adams & A. Adams, 1857 (CARDITIDAE)
- thecaphora, Julia thecaphora (P.P. Carpenter, 1857) - (JULIIDAE)
- Thecaphorus, syn of: Genus Smaragdinella A. Adams & L.A. Reeve, 1848 (HAMINOEIDAE)
- Theceurybia, syn of: Genus Hydromyles J. von Gistel, 1848 (HYDROMYLIDAE)
- thecla, Paraclathurella thecla (K.H.J. Thiele, 1925) - (CLATHURELLIDAE)
- Thecodonta, Genus Thecodonta A. Adams, 1864 (MONTACUTIDAE)
- thecoida, Corbula thecoida I.H. Jonas, 1844 - syn of: Corbula ovalina J.B.P.A. Lamarck, 1818 - (CORBULIDAE)
- Thecopsella, Genus Thecopsella E.C. Munier-Chalmas in A.E.M. Cossmann, 1888 (CAECIDAE)
- THECOSOMATA (UNASSIGNED) - Family (GASTROPODA-HETEROBRANCHIA [Subclass]-OPISTHOBRANCHIA [Infraclass]-THECOSOMATA [Order]) (FOSSIL)
- thedana, Torresitrachia thedana G.A. Solem, 1985 - (CAMAENIDAE)
- theeli, Sinalbinula theeli (C.A. Westerlund, 1877) - (GASTROCOPTIDAE)
- theeli, Pupilla theeli C.A. Westerlund, 1898 - syn of: Sinalbinula huttoniana (W.H. Benson, 1849) - (PUPILLIDAE)
- theeva, Cryptocypraea theeva W.R. Steadman & B.C. Cotton, 1943 - syn of: Cryptocypraea dillwyni (F.A. Schilder, 1922) - (CYPRAEIDAE)
- Theganoceras, Genus Theganoceras Whitehouse, 1926 † (OPPELIIDAE) (FOSSIL)
- theini, Ordosoceras theini Niko & Sone, 2014 † - (POLYDESMIIDAE) (FOSSIL)
- theiocrenetus, Aphaostracon theiocrenetus F.G. Thompson, 1968 - (COCHLIOPIDAE)
- thektapleura, Kurtziella thektapleura J. Gardner, 1937 † - (MANGELIIDAE) (FOSSIL)
- thelacme, Fossarus thelacme J.C. Melvill, 1904 - (PLANAXIDAE)
- thelacme, Macromphalus thelacme (J.C. Melvill, 1904) - (VANIKORIDAE)
- Thelacytharella, syn of: Genus Notocytharella L.G. Hertlein & A. Strong, 1955 (MANGELIIDAE)
- thelcterium, Granulopsis thelcterium (J.R. le B. Tomlin, 1929) - (CERITHIOPSIDAE)
- thelcterium, Epitonium thelcterium (J.C. Melvill & R. Standen, 1903) - (EPITONIIDAE)
- thelecoryphe, Trochomorpha thelecoryphe J.J. Vermeulen, T.S. Liew & M. Schilthuizen, 2015 - (TROCHOMORPHIDAE)
- Thelecythara, Genus Thelecythara W.P. Woodring, 1928 (HORAICLAVIDAE)
- Thelecytharella, syn of: Genus Otitoma F.P. Jousseaume, 1898 (PSEUDOMELATOMIDAE)
- Theliconus, syn of: Genus Hermes P.D. Montfort, 1810 (CONIDAE)
- Theliderma, Genus Theliderma W.J. Swainson, 1840 (UNIONIDAE)
- Thelidioteuthis, syn of: Genus Ancistrocheirus J.E. Gray, 1849 (ANCISTROCHEIRIDAE)
- Thelidomus, Genus Thelidomus W.J. Swainson, 1840 (PLEURODONTIDAE)
- Thelidonta, syn of: Genus Eurycratera H.H. Beck, 1837 (PLEURODONTIDAE)
- Theliodomus, syn of: Genus Eurycratera H.H. Beck, 1837 (PLEURODONTIDAE)
- Theliostoma, syn of: Genus Morum P.F. Röding, 1798 (HARPIDAE)
- Theliostyla, Subgenus Nerita (Theliostyla) O.A.L. Mörch, 1852 (NERITIDAE)
- thelma, Syrnola thelma W.H. Dall, 1913 † - (PYRAMIDELLIDAE) (FOSSIL)
- thelmae, Trinchesia thelmae (R.F. Burn, 1964) - (TRINCHESIIDAE)
- theloides, Ventridens theloides B. Walker & H.A. Pilsbry, 1902 - (GASTRODONTIDAE)
- thelussoniae, Jouannetia thelussoniae J.B.C.P. de Raincourt & Munier, 1863 † - (PHOLADIDAE) (FOSSIL)
- thelxinoa, Pyrgulina thelxinoa (J.C. Melvill, 1906) - (PYRAMIDELLIDAE)
- Thelxinovum, syn of: Genus Notocypraea F.A. Schilder, 1927 (CYPRAEIDAE)
- Thelycytharella, syn of: Genus Notocytharella L.G. Hertlein & A. Strong, 1955 (MANGELIIDAE)
- Thelyssa, Genus Thelyssa F.M. Bayer, 1971 (SEGUENZIIDAE)
- Thelyssina, Genus Thelyssina B.A. Marshall, 1983 (SEGUENZIIDAE)
- thema, Erronea thema T. Iredale, 1939 - syn of: Erronea caurica (C. Linnaeus, 1758) - (CYPRAEIDAE)
- themaki, Melanopsis themaki Š. Brusina, 1903 † - syn of: Microcolpia parreyssii sikorai (Š. Brusina, 1903 †) - (MELANOPSIDAE) (FOSSIL)
- themaki bifilosa, Melanopsis themaki bifilosa Š. Brusina, 1903 † - syn of: Microcolpia parreyssii sikorai (Š. Brusina, 1903 †) - (MELANOPSIDAE) (FOSSIL)
- themaki megalostoma, Melanopsis themaki megalostoma Š. Brusina, 1903 † - syn of: Microcolpia parreyssii sikorai (Š. Brusina, 1903 †) - (MELANOPSIDAE) (FOSSIL)
- themaki plicatula, Melanopsis themaki plicatula Š. Brusina, 1903 † - syn of: Microcolpia parreyssii sikorai (Š. Brusina, 1903 †) - (MELANOPSIDAE) (FOSSIL)
- themaki trifilosa, Melanopsis themaki trifilosa Š. Brusina, 1903 † - syn of: Microcolpia parreyssii sikorai (Š. Brusina, 1903 †) - (MELANOPSIDAE) (FOSSIL)
- themaki unicarinata, Melanopsis themaki unicarinata Š. Brusina, 1903 † - syn of: Microcolpia parreyssii sikorai (Š. Brusina, 1903 †) - (MELANOPSIDAE) (FOSSIL)
- themaki unifilosa, Melanopsis themaki unifilosa Š. Brusina, 1903 † - syn of: Microcolpia parreyssii sikorai (Š. Brusina, 1903 †) - (MELANOPSIDAE) (FOSSIL)
- Themapupa, syn of: Genus Pupoides L. Pfeiffer, 1854 (PUPILLIDAE)
- themedensis, Helicaulax themedensis (Abbass, 1963 †) - (APORRHAIDAE) (FOSSIL)
- themedensis, Pseudoptera themedensis El Qot, 2006 † - (BAKEVELLIIDAE) (FOSSIL)
- themera, Hemicycla themera J.F. Mabille, 1883 - syn of: Hemicycla gaudryi (A.V.M.D. D'Orbigny, 1839) - (HELICIDAE)
- themera, Oxychilus themera J.F. Mabille, 1882 - syn of: Oxychilus draparnaudi (H.H. Beck, 1837) - (OXYCHILIDAE)
- themeropis, Sypharochiton themeropis (T. Iredale, 1914) - (CHITONIDAE)
- themeropis, Chiton themeropis (T. Iredale, 1914) - syn of: Sypharochiton themeropis (T. Iredale, 1914) - (CHITONIDAE)
- themeropis, Anacithara themeropis (J.C. Melvill & R. Standen, 1896) - (HORAICLAVIDAE)
- themeropsis, Chiton themeropsis (T. Iredale, 1914) - (CHITONIDAE)
- themeropsis, Anacithara themeropsis J.C. Melvill & R. Standen, 1896 - syn of: Anacithara themeropis (J.C. Melvill & R. Standen, 1896) - (HORAICLAVIDAE)
- theminckiana, Melania theminckiana S.A.A. Petit De La Saussaye, 1853 - syn of: Clea helena (von dem Busch in R.A. Philippi, 1847) - (THIARIDAE)
- themis, Quantula themis (E.A. Smith, 1895) - (DYAKIIDAE)
- themisae, Gibberula themisae J. Espinosa & J.A. Ortea, 2007 - (CYSTISCIDAE)
- Themisto, syn of: Genus Polycera G.L.C.F.D. Cuvier, 1817 (POLYCERIDAE)
- themita, Helix themita J.F. Mabille - syn of: Arianta arbustorum (C. Linnaeus, 1758) - (HELICIDAE)
- theobaldi, Pila theobaldi S.C.T. Hanley, 1875 - (AMPULLARIIDAE)
- theobaldi, Syama theobaldi G.P.L.K. Gude - (ARIOPHANTIDAE)
- theobaldi, Phaedusa theobaldi (W.T. Blanford, 1872) - (CLAUSILIIDAE)
- theobaldi, Alycaeus theobaldi W.T. Blanford, 1862 - (CYCLOPHORIDAE)
- theobaldi, Distichoceras theobaldi Erni, 1934 † - (OPPELIIDAE) (FOSSIL)
- theobaldi, Ligatella theobaldi E. Fischer-Piette, Ch.P. Blanc, F. Blanc & F. Salvat, 1993 - (POMATIIDAE)
- theobaldi, Duplicaria theobaldi E.W. Vredenburg, 1921 † - (TEREBRIDAE) (FOSSIL)
- theobaldi, Radiatula theobaldi H.B. Preston, 1912 - (UNIONIDAE)
- theobaldi, Taia theobaldi (W. Kobelt, 1909) - (VIVIPARIDAE)
- theobaldiana, Bensonies theobaldiana (H.H. Godwin-Austen) - (ARIOPHANTIDAE)
- theobaldiana, Assiminea theobaldiana G. Nevill, 1880 - (ASSIMINEIDAE)
- theobaldiana, Pleuropoma theobaldiana (G. Nevill & H. Nevill, 1878) - (HELICINIDAE)
- theobaldianum, Kossmaticeras theobaldianum (Stolickza, 1865 †) - (KOSSMATICERATIDAE) (FOSSIL)
- theobaldianus, Cyclophorus theobaldianus W.H. Benson, 1857 - (CYCLOPHORIDAE)
- theobaldianus, Holcodiscus theobaldianus Stolickza, 1865 † - syn of: Kossmaticeras theobaldianum (Stolickza, 1865 †) - (HOLCODISCIDAE) (FOSSIL)
- Theobaldius, Genus Theobaldius G. Nevill, 1878 (CYCLOPHORIDAE)
- theobroma, Conus theobroma P.F. Röding, 1798 - syn of: Puncticulis zeylanicus (J.F. Gmelin, 1791) - (CONIDAE)
- theobroma, Halgerda theobroma S.J. Fahey & T.M. Gosliner, 2001 - (DISCODORIDIDAE)
- theobroma, Drillia theobroma A.A. Olsson, 1922 † - (DRILLIIDAE) (FOSSIL)
- theobroma, Nucella theobroma P.F. Röding, 1798 - syn of: Nucella lapillus (C. Linnaeus, 1758) - (MURICIDAE)
- Theoceras, Genus Theoceras Kröger , 2008 † (ORTHOCERATIDAE) (FOSSIL)
- theodokii, Cincinna theodokii É.A.A. Locard, 1889 - (VALVATIDAE)
- theodorei, Partulina theodorei D.D. Baldwin, 1895 - (ACHATINELLIDAE)
- theodorei, Conus theodorei E.J. Petuch, 2000 - syn of: Purpuriconus richardbinghami E.J. Petuch, 1993 - (CONIDAE)
- theodorei multistrigata, Partulina theodorei multistrigata H.A. Pilsbry & C.M. Cooke, 1912 - (ACHATINELLIDAE)
- theodorensis, Parallelodon theodorensis C.O. Waterhouse, 1987 † - (PARALLELODONTIDAE) (FOSSIL)
- theodori, Hemiplecta theodori (R.A. Philippi) - (ARIOPHANTIDAE)
- theodori, Albinaria brevicollis theodori K.L. Pfeiffer, 1955 - (CLAUSILIIDAE)
- theodori, Clavatula theodori (F. Toula, 1910 †) - (CLAVATULIDAE) (FOSSIL)
- theodori, Theodorites theodori Baraboshkin & Mikhailova, 2006 † - (CRIOCERATITIDAE) (FOSSIL)
- theodori, Cyclophorus theodori C.M.F. Ancey, 1887 - (CYCLOPHORIDAE)
- theodorii, Ptychomphalus theodorii Schrufer, 1861 † - (PTYCHOMPHALIDAE) (FOSSIL)
- Theodorites, Genus Theodorites Baraboshkin & Mikhailova, 2006 † (CRIOCERATITIDAE) (FOSSIL)
- theodosia, Helix theodosia S. Clessin, 1881 - syn of: Xeropicta krynickii (Andrzeiewsky in I. Krynicki, 1833) - (HELICIDAE)
- theodosiae, Mendax theodosiae M. Jay & J. Drivas, 2002 - (CERITHIOPSIDAE)
- theodosianus, Bulimus theodosianus J.R. Bourguignat, 1876 - syn of: Brephulopsis bidens (I. Krynicki, 1833) - (BULIMULIDAE)
- theodosianus, Brephulopsis bidens theodosianus (J.R. Bourguignat, 1876) - (ENIDAE)
- Theodoxia, syn of: Genus Theodoxus P.D. Montfort, 1810 (NERITIDAE)
- Theodoxis, syn of: Genus Theodoxus P.D. Montfort, 1810 (NERITIDAE)
- Theodoxus, Genus Theodoxus P.D. Montfort, 1810 (NERITIDAE)
- theoi, Taramelliceras theoi Quereilhac & Guinot, 2011 † - (OPPELIIDAE) (FOSSIL)
- theone, Turbonilla theone P. Bartsch, 1927 - (PYRAMIDELLIDAE)
- Theora, Genus Theora H. Adams & A. Adams, 1856 (SEMELIDAE)
- theoreta, Funa theoreta (J.C. Melvill, 1899) - (PSEUDOMELATOMIDAE)
- theoripkeni, Pseudosubulina theoripkeni O. Gargominy & I.V. Muratov, 2012 - (SPIRAXIDAE)
- theoteles, Iredalea theoteles (J.C. Melvill & R. Standen, 1896) - (DRILLIIDAE)
- theoteles, Mangilia theoteles J.C. Melvill & R. Standen, 1896 - syn of: Iredalea theoteles (J.C. Melvill & R. Standen, 1896) - (MANGELIIDAE)
- thepalea, Lyncina thepalea T. Iredale, 1939 - syn of: Lyncina carneola propinqua (A. Garrett, 1879) - (CYPRAEIDAE)
- thepalea, Mangelia thepalea J.C. Melvill & R. Standen, 1896 - (MANGELIIDAE)
- Thera, syn of: Subgenus Flammocharopa (Aeschrodomus) H.A. Pilsbry, 1892 (CHAROPIDAE)
- theragrae, Enoploteuthis theragrae Iw. Taki, 1964 - syn of: Enoploteuthis chunii M. Ishikawa, 1914 - (ENOPLOTEUTHIDAE)
- Therasia, Genus Therasia F.W. Hutton, 1883 (CHAROPIDAE)
- Therasiella, Genus Therasiella A. Powell, 1948 (CHAROPIDAE)
- thereganum, Mangelia thereganum J.C. Melvill & R. Standen, 1896 - syn of: Kermia lutea (W.H. Pease, 1860) - (MANGELIIDAE)
- thereganum, Kermia thereganum J.C. Melvill & R. Standen, 1896, 1897 - syn of: Kermia lutea (W.H. Pease, 1860) - (RAPHITOMIDAE)
- Thereitis, Genus Thereitis le Renard, 1997 † (CERITHIOPSIDAE) (FOSSIL)
- therella, Cernuella therella J. Berthier, 1887 - syn of: Cernuella virgata (E.M. Da Costa, 1778) - (HYGROMIIDAE)
- theresa, Helicodiscus theresa K.H.J. Thiele, 1927 - (HELICODISCIDAE)
- theresa, Turbonilla theresa K.H.J. Thiele, 1925 - syn of: Babella funiculata E. Saurin, 1962 - (PYRAMIDELLIDAE)
- theresa, Truncatella theresa A. Risso, 1826 - syn of: Truncatella subcylindrica (C. Linnaeus, 1767) - (TRUNCATELLIDAE)
- theresae, Zonaria theresae L. Dolin, 1991 † - (CYPRAEIDAE) (FOSSIL)
- theresae, Mytilon theresae Marincovich Jr., 1993 † - (MYTILIDAE) (FOSSIL)
- theresae, Laevipilina theresae M. Schrödl, 2006 - (NEOPILINIDAE)
- theresiae, Cretica tenuicostata theresiae H. Nordsieck, 2017 - (CLAUSILIIDAE)
- theriaca, Cypraea theriaca J.C. Melvill, 1888 - syn of: Cypraea pantherina J. Lightfoot, 1786 - (CYPRAEIDAE)
- Thericium, Subgenus Cerithium (Thericium) Monterosato, 1809 † (CERITHIIDAE) (FOSSIL)
- Thericium, syn of: Genus Cerithium J.G. Bruguičre, 1789 (CERITHIIDAE)
- Therioceras, Genus Therioceras Zhuravleva, 1972 † (DISCOSORIDA (UNASSIGNED)) (FOSSIL)
- Theristes, syn of: Genus Thersites L. Pfeiffer, 1855 (CAMAENIDAE)
- theristica, Euphaedusa porphyrea theristica (J.F. Mabille, 1887) - (CLAUSILIIDAE)
- thermaecola, Stenothyra thermaecola J.T. Kuroda, 1962 - (STENOTHYRIDAE)
- thermale, Pisidium thermale D. Dupuy, 1849 - syn of: Pisidium casertanum (Poli, 1791) - (SPHAERIIDAE)
- thermali, Biomphalaria thermali (W.A. Biese, 1951) - (PLANORBIDAE)
- thermalis, Heleobia thermalis G.R. von Frauenfeld, 1853 - syn of: Semisalsa stagnorum (J.F. Gmelin, 1791) - (COCHLIOPIDAE)
- thermalis, Belgrandia thermalis (C. Linnaeus, 1767) - (HYDROBIIDAE)
- thermalis, Pyrgulopsis thermalis D.W. Taylor, 1987 - (HYDROBIIDAE)
- thermalis, Hadziella thermalis J. Bole, 1992 - (HYDROBIIDAE)
- thermalis, Microcolpia daudebartii thermalis (A. Brot, 1868) - (MELANOPSIDAE)
- thermalis, Theodoxus fluviatilis thermalis (N. Boubee, 1833) - (NERITIDAE)
- thermalis, Planorbis thermalis C.A. Westerlund, 1885 - syn of: Gyraulus laevis (J. Alder, 1838) - (PLANORBIDAE)
- thermalis, Gyraulus thermalis C.A. Westerlund, 1885 - syn of: Gyraulus laevis (J. Alder, 1838) - (PLANORBIDAE)
- thermalis, Oxyloma thermalis N. Boubee, 1877 - syn of: Oxyloma elegans (A. Risso, 1826) - (SUCCINEIDAE)
- Thermalites, Genus Thermalites Smith , 1927 † (HALORITIDAE) (FOSSIL)
- thermariensis, Fusinus thermariensis R. Hadorn & K. Fraussen, 2006 - (FASCIOLARIIDAE)
- thermarum, Thermalites thermarum Smith, 1927 † - syn of: Juvenites thermarum (Smith, 1927 †) - (HALORITIDAE) (FOSSIL)
- thermarum, Juvenites thermarum (Smith, 1927 †) - (MELAGATHICERATIDAE) (FOSSIL)
- thermarum, Zingis thermarum (J.C. Melvill & J.H. Ponsonby) - (UROCYCLIDAE)
- Thermia, Subgenus Therasia (Thermia) F.W. Hutton, 1904 (CHAROPIDAE)
- thermimontis, Helminthoglypta thermimontis S.S. Berry, 1953 - (HELMINTHOGLYPTIDAE)
- thermobaicalica, Lymnaea thermobaicalica N.D. Kruglov & Y.I. Starobogatov, 1989 - (LYMNAEIDAE)
- Thermochiton, Genus Thermochiton H. Saito & T.A. Okutani, 1991 (ISCHNOCHITONIDAE)
- thermochukchensis, Anisus thermochukchensis L.A. Prozorova & Y.I. Starobogatov, 1997 - (PLANORBIDAE)
- Thermocollonia, syn of: Genus Cantrainea J.G. Jeffreys, 1883 (COLLONIIDAE)
- Thermohydrobia, syn of: Genus Heleobia W. Stimpson, 1865 (COCHLIOPIDAE)
- thermokamtschatica, Lymnaea thermokamtschatica N.D. Kruglov & Y.I. Starobogatov, 1989 - (LYMNAEIDAE)
- thermophila, Bythinella thermophila P. Glöer, A. Varga & Mrkvicka, 2015 - (BYTHINELLIDAE)
- thermophilum, Buccinum thermophilum M.G. Harasewych & Y.I. Kantor, 2002 - (BUCCINIDAE)
- thermophilus, Bathymodiolus thermophilus Kenk & Wilson, 1985 - (MYTILIDAE)
- thermopylarum, Isabellaria thermopylarum (L. Pfeiffer, 1850) - (CLAUSILIIDAE)
- thermopylarum blanci, Isabellaria thermopylarum blanci (E.C. Von Martens, 1876) - (CLAUSILIIDAE)
- thermopylarum faueri, Isabellaria thermopylarum faueri (H. Nordsieck, 1974) - (CLAUSILIIDAE)
- Thermosipho, Genus Thermosipho Kantor, Puillandre, Fraussen, Fedosov & Bouchet, 2013 (BUCCINIDAE)
- theron, Discotropites theron (Dittmar, 1866 †) - (TROPITIDAE) (FOSSIL)
- therriaulti, Lindaconus therriaulti E.J. Petuch, 2013 - (CONIDAE)
- Thersistrombus, Genus Thersistrombus K. Bandel, 2007 (STROMBIDAE)
- Thersitea, Genus Thersitea Coquand, 1862 † (THERSITEIDAE) (FOSSIL)
- THERSITEIDAE Savornin, 1915 † - Family (GASTROPODA-CAENOGASTROPODA [Subclass]-LITTORINIMORPHA [Order]-STROMBOIDEA [Superfamily]) (FOSSIL)
- thersites, Deroceras thersites H.R. Simroth, 1886 - (AGRIOLIMACIDAE)
- thersites, Aporrhais thersites (Brives, 1897 †) - (APORRHAIDAE) (FOSSIL)
- thersites, Chloraea thersites (W.J. Broderip, 1841) - (BRADYBAENIDAE)
- thersites, Buccinum thersites J.G. Bruguière, 1789 - syn of: Nassarius pullus (C. Linnaeus, 1758) - (BUCCINIDAE)
- thersites, Bufonaria thersites (J.H. Redfield, 1846) - (BURSIDAE)
- Thersites, Genus Thersites L. Pfeiffer, 1855 (CAMAENIDAE)
- thersites, Clathurella thersites K. Martin, 1914 † - syn of: Fusiclathurella thersites (K. Martin, 1914 †) - (CLATHURELLIDAE) (FOSSIL)
- thersites, Zoila thersites (J.S. Gaskoin, 1849) - (CYPRAEIDAE)
- thersites, Opisthostoma thersites W.S.S. Van Benthem-Jutting, 1952 - (DIPLOMMATINIDAE)
- thersites, Melanella thersites (P.P. Carpenter, 1864) - (EULIMIDAE)
- thersites, Eulima thersites P.P. Carpenter, 1864 - syn of: Melanella thersites (P.P. Carpenter, 1864) - (EULIMIDAE)
- thersites, Africolaria thersites (L.A. Reeve, 1847) - (FASCIOLARIIDAE)
- thersites, Littorina thersites L.A. Reeve, 1857 - syn of: Austrolittorina araucana (A.V.M.D. D'Orbigny, 1840) - (LITTORINIDAE)
- thersites, Austrolittorina thersites L.A. Reeve, 1857 - syn of: Austrolittorina araucana (A.V.M.D. D'Orbigny, 1840) - (LITTORINIDAE)
- thersites, Mangilia thersites K. Martin, 1914 † - syn of: Fusiclathurella thersites (K. Martin, 1914 †) - (MANGELIIDAE) (FOSSIL)
- thersites, Ocenebra thersites G.S. Coen, 1933 - syn of: Ocenebra erinaceus (C. Linnaeus, 1758) - (MURICIDAE)
- thersites, Nassa thersites J.G. Bruguière, 1789 - syn of: Nassarius pullus (C. Linnaeus, 1758) - (NASSARIIDAE)
- thersites, Nassarius thersites J.G. Bruguière, 1789 - syn of: Nassarius pullus (C. Linnaeus, 1758) - (NASSARIIDAE)
- thersites, Distorsio thersites R.A. Philippi, 1887 † - syn of: Distorsio ringens R.A. Philippi, 1887 † - (PERSONIDAE) (FOSSIL)
- thersites, Monoplex thersites (L.A. Reeve, 1844) - (RANELLIDAE)
- thersites, Ranella thersites J.H. Redfield, 1846 - syn of: Bufonaria thersites (J.H. Redfield, 1846) - (RANELLIDAE)
- thersites, Siphonaria thersites P.P. Carpenter, 1864 - (SIPHONARIIDAE)
- thersites, Thersistrombus thersites (W.J. Swainson, 1823) - (STROMBIDAE)
- thersites, Strombus thersites W.J. Swainson, 1823 - syn of: Thersistrombus thersites (W.J. Swainson, 1823) - (STROMBIDAE)
- thersites, Turbinella thersites L.A. Reeve, 1847 - syn of: Africolaria thersites (L.A. Reeve, 1847) - (TURBINELLIDAE)
- thersites, Fusiclathurella thersites (K. Martin, 1914 †) - (TURRIDAE) (FOSSIL)
- thersites, Angulyagra thersites (L.A. Reeve, 1863) - (VIVIPARIDAE)
- thersites acypha, Nassa thersites acypha E.C. Von Martens, 1886 - syn of: Nassarius pullus (C. Linnaeus, 1758) - (NASSARIIDAE)
- thersites atrata, Zoila thersites atrata G.R. Sulliotti, 1924 - syn of: Zoila thersites (J.S. Gaskoin, 1849) - (CYPRAEIDAE)
- thersites bimaculosa, Nassarius thersites bimaculosa A. Adams, 1852 - syn of: Nassarius bimaculosus (A. Adams, 1852) - (NASSARIIDAE)
- thersites contraria, Zoila thersites contraria T. Iredale, 1935 - (CYPRAEIDAE)
- thersites eburnea, Zoila thersites eburnea L. Raybaudi Massilia, 1985 - (CYPRAEIDAE)
- thersites irus, Nassa thersites irus E.C. Von Martens, 1880 - syn of: Nassarius irus (E.C. Von Martens, 1880) - (NASSARIIDAE)
- theryi, Anodonta theryi Bèdé, 1932 - syn of: Anodonta cygnea (C. Linnaeus, 1758) - (UNIONIDAE)
- thesaura, Nassaria thesaura K. Fraussen & G.T. Poppe, 2007 - (NASSARIIDAE)
- thesauri, Tropidophora thesauri E. Fischer-Piette, 1945 - (POMATIIDAE)
- thesaurista, Glyphostoma thesaurista J.C. Melvill & R. Standen, 1896, 1897 - syn of: Glyphostoma parthenicum R.P.J. Hervier, 1896 - (CLATHURELLIDAE)
- thesaurista, Mangelia thesaurista Malvill & R. Standen, 1896 - syn of: Glyphostoma parthenicum R.P.J. Hervier, 1896 - (MANGELIIDAE)
- thesaurus, Dolicholatirus thesaurus (T.A. Garrard, 1963) - (FASCIOLARIIDAE)
- Thesbia, Genus Thesbia J.G. Jeffreys, 1867 (RAPHITOMIDAE)
- thesei, Cassis thesei (A. Brongniart, 1823 †) - (CASSIDAE) (FOSSIL)
- Theskaloceras, Genus Theskaloceras Chen & Teichert, 1983 (BALKOCERATIDAE) (FOSSIL)
- theskela, Macteola theskela (J.C. Melvill & R. Standen, 1895) - (MANGELIIDAE)
- theskela, Mangelia theskela J.C. Melvill & R. Standen, 1895 - syn of: Macteola theskela (J.C. Melvill & R. Standen, 1895) - (MANGELIIDAE)
- Theskeloceras, Genus Theskeloceras † (ELLESMEROCERIDA (UNASSIGNED)) (FOSSIL)
- theskeloides, Mangelia theskeloides J.C. Melvill & R. Standen, 1895 - (MANGELIIDAE)
- Theskelomensor, Genus Theskelomensor T. Iredale, 1933 (ENDODONTIDAE)
- thespesia, Pleurotomoides thespesia J.C. Melvill & R. Standen, 1896 - syn of: Kermia thespesia (J.C. Melvill & R. Standen, 1896) - (CLATHURELLIDAE)
- thespesia, Hemicycla thespesia J.F. Mabille, 1882 - syn of: Hemicycla consobrina retrodens (A. Mousson, 1872) - (HELICIDAE)
- thespesia, Kermia thespesia (J.C. Melvill & R. Standen, 1896) - (RAPHITOMIDAE)
- thespesia, Daphnella thespesia J.C. Melvill & R. Standen, 1896 - syn of: Kermia thespesia (J.C. Melvill & R. Standen, 1896) - (RAPHITOMIDAE)
- thespesia plurilineata, Kermia thespesia plurilineata J.L. Bouge & P. Dautzenberg, 1914 - syn of: Kermia thespesia (J.C. Melvill & R. Standen, 1896) - (RAPHITOMIDAE)
- thessala, Isabellaria saxicola thessala (O. Böttger, 1886) - (CLAUSILIIDAE)
- thessalica, Helix thessalica O. Böttger, 1886 - syn of: Helix pomatia C. Linnaeus, 1758 - (HELICIDAE)
- thessalica, Xeromunda thessalica B. Hausdorf, 1990 - (HYGROMIIDAE)
- thessalica, Paladilhiopsis thessalica (H. Schütt, 1970) - (MOITESSIERIIDAE)
- thessalonica, Isabellaria thessalonica (H. Nordsieck, 1972) - (CLAUSILIIDAE)
- thessalonica, Bulgarica denticulata thessalonica (E.A. Rossmässler, 1839) - (CLAUSILIIDAE)
- thessalonica boettgeri, Isabellaria thessalonica boettgeri H. Nordsieck, 1993 - (CLAUSILIIDAE)
- thessalonica crassilabra, Isabellaria thessalonica crassilabra E. Neubert, 1993 - (CLAUSILIIDAE)
- thestia, Compsodrillia thestia (W.H. Dall, 1919) - (PSEUDOMELATOMIDAE)
- Thestyleda, syn of: Genus Nuculana J.H.F. Link, 1807 (NUCULANIDAE)
- Thestyleda, syn of: Genus Nuculana J.H.F. Link, 1807 (NUCULANIDAE)
- Theta, Genus Theta A.H. Clarke, 1959 (RAPHITOMIDAE)
- Thetagada, syn of: Genus Rhagada J.A. Albers, 1860 (CAMAENIDAE)
- thethydea, Tritonia thethydea S. Delle Chiaje, 1841 - syn of: Marionia blainvillea (A. Risso, 1818) - (TRITONIIDAE)
- thetidis, Pseudomalaxis thetidis T.A. Garrard, 1977 - syn of: Spirolaxis rotulacatharinea (J.C. Melvill & R. Standen, 1903) - (ARCHITECTONICIDAE)
- thetidis, Spirolaxis thetidis T.A. Garrard, 1977 - syn of: Spirolaxis rotulacatharinea (J.C. Melvill & R. Standen, 1903) - (ARCHITECTONICIDAE)
- thetidis, Pratulum thetidis (C. Hedley, 1902) - (CARDIIDAE)
- thetidis, Cylichna thetidis C. Hedley, 1903 - (CYLICHNIDAE)
- thetidis, Striodentalium thetidis (C. Hedley, 1903) - (DENTALIIDAE)
- thetidis, Entalinopsis thetidis C. Hedley, 1903 - syn of: Striodentalium thetidis (C. Hedley, 1903) - (ENTALINIDAE)
- thetidis, Argopecten thetidis (Sowerby, 1850 †) - (PECTINIDAE) (FOSSIL)
- thetidis, Pecten thetidis Sowerby, 1850 † - syn of: Argopecten thetidis (Sowerby, 1850 †) - (PECTINIDAE) (FOSSIL)
- thetidis, Chlamys thetidis Sowerby, 1850 † - syn of: Argopecten thetidis (Sowerby, 1850 †) - (PECTINIDAE) (FOSSIL)
- thetidis, Aequipecten thetidis Sowerby, 1850 † - syn of: Argopecten thetidis (Sowerby, 1850 †) - (PECTINIDAE) (FOSSIL)
- thetidis, Amussium thetidis C. Hedley, 1902 - syn of: Parvamussium thetidis (C. Hedley, 1902) - (PECTINIDAE)
- thetidis, Parvamussium thetidis (C. Hedley, 1902) - (PROPEAMUSSIIDAE)
- thetidis optimum, Argopecten thetidis optimum J. Brown & H.A. Pilsbry, 1913 - (PECTINIDAE)
- Thetidites, Genus Thetidites Mojsisovics , 1896 † (THETIDITIDAE) (FOSSIL)
- THETIDITIDAE Tozer, 1971 † - Family (CEPHALOPODA-AMMONOIDEA [Subclass]-CERATITIDA [Order]-CLYDONITOIDEA [Superfamily]) (FOSSIL)
- Thetidos, Subgenus Lienardia (Thetidos) C. Hedley, 1899 (CLATHURELLIDAE)
- Thetiopsis, Genus Thetiopsis Meek, 1876 † (CARDIIDA (UNASSIGNED)) (FOSSIL)
- Thetironia, Genus Thetironia Stoliczka, 1870 † (MACTROMYIDAE) (FOSSIL)
- thetis, Metriomphalus thetis (Münster, 1844 †) - (ANGARIIDAE) (FOSSIL)
- thetis, Drillia thetis E.A. Smith, 1904 - syn of: Striatoguraleus thetis (E.A. Smith, 1904) - (DRILLIIDAE)
- thetis, Striatoguraleus thetis (E.A. Smith, 1904) - (HORAICLAVIDAE)
- Thetis, Genus Thetis Sowerby, 1826 † (MACTROMYIDAE) (FOSSIL)
- thetis, Marginella thetis W.H. Turton, 1932 - syn of: Marginella piperata R.B. Hinds, 1844 - (MARGINELLIDAE)
- thetis, Bullia thetis W.H. Turton, 1932 - syn of: Bullia pura J.C. Melvill, 1885 - (NASSARIIDAE)
- thetis, Partula thetis C.G. Semper, 1865 - (PARTULIDAE)
- thetis, Patella thetis W.H. Turton, 1932 - syn of: Scutellastra barbara (C. Linnaeus, 1758) - (PATELLIDAE)
- thetis, Platyceras thetis J.W. Hall, 1862 † - (PLATYCERATIDAE) (FOSSIL)
- Thetis, syn of: Genus Poromya E. Forbes, 1844 (POROMYIDAE)
- thetis, Gari thetis W.H. Turton, 1932 - syn of: Hiatula capensis (G.B. III Sowerby, 1889) - (PSAMMOBIIDAE)
- thetis, Sanguinolaria thetis W.H. Turton, 1932 - syn of: Hiatula capensis (G.B. III Sowerby, 1889) - (PSAMMOBIIDAE)
- thetis, Trigonia thetis R.A. Philippi, 1899 † - (TRIGONIIDAE) (FOSSIL)
- thetis, Mastonia thetis (C. Hedley, 1899) - (TRIPHORIDAE)
- Thetis, syn of: Genus Gouldia C.B. Adams, 1847 (VENERIDAE)
- thetisae, Gibberula thetisae J. Espinosa, J.A. Ortea & G.M. Caballer, 2011 - (CYSTISCIDAE)
- thetisae, Chrysallida thetisae J. Espinosa & J.A. Ortea, 2011 - (PYRAMIDELLIDAE)
- Thetys, Genus Thetys Benoist in Peyrot, 1932 † (APLYSIIDAE) (FOSSIL)
- thetys, Nassarina thetys P.M.S. Costa & R.S. Absalão, 1998 - (COLUMBELLIDAE)
- thetys, Hypophylloceras thetys (A.V.M.D. D'Orbigny, 1841 †) - (PHYLLOCERATIDAE) (FOSSIL)
- thetys diegoi, Hypophylloceras thetys diegoi (Boule & al., 1906 †) - (PHYLLOCERATIDAE) (FOSSIL)
- Thetystrombus, syn of: Genus Persististrombus G.C. Kronenberg & Y.C. Lee, 2007 (STROMBIDAE)
- thevenardensis, Conus thevenardensis A.J. Da Motta, 1987 - syn of: Kioconus reductaspiralis (J.G. Walls, 1979) - (CONIDAE)
- thevenini, Bigotites thevenini (Nicolesco, 1917 †) - (PERISPHINCTIDAE) (FOSSIL)
- thevestensis, Idonearca thevestensis Coquand, 1862 † - (CUCULLAEIDAE) (FOSSIL)
- thevesthensis, Fagesia thevesthensis Peron, 1896 † - syn of: Fagesia tevesthensis (Peron, 1896 †) - (VASCOCERATIDAE) (FOSSIL)
- thewe, Turbonilla thewe A. Peñas & E. Rolán, 2010 - (PYRAMIDELLIDAE)
- thia, Daphnella thia J.C. Melvill & R. Standen, 1903 - (RAPHITOMIDAE)
- thiara, Mitrella thiara (G.B. Brocchi, 1814 †) - (COLUMBELLIDAE) (FOSSIL)
- thiara, Terebralia thiara (J.G. Bruguière, 1792 †) - (POTAMIDIDAE) (FOSSIL)
- Thiara, Genus Thiara P.F. Röding, 1798 (THIARIDAE)
- thiara, Gibbula thiara G.S. Coen, 1930 - syn of: Gibbula albida (J.F. Gmelin, 1791) - (TROCHIDAE)
- thiara, Venus thiara G.B. I Sowerby, 1834 - syn of: Placamen lamellatum (P.F. Röding, 1798) - (VENERIDAE)
- thiara, Voluta thiara L.W. Dillwyn, 1817 - syn of: Tiarella stictica (J.H.F. Link, 1807) - (VOLUTIDAE)
- Thiarapiranella, syn of: Genus Pirenella J.E. Gray, 1847 (POTAMIDIDAE)
- thiarella, Granulolabium thiarella (G.P. Deshayes, 1833 †) - (BATILLARIIDAE) (FOSSIL)
- thiarella, Cerithium thiarella G.P. Deshayes, 1833 † - syn of: Granulolabium thiarella (G.P. Deshayes, 1833 †) - (CERITHIIDAE) (FOSSIL)
- thiarella, Nodilittorina thiarella H.E. Anton, 1838 - syn of: Echinolittorina tuberculata (K.T. Menke, 1828) - (LITTORINIDAE)
- Thiarella, syn of: Genus Mitra J.B.P.A. Lamarck, 1798 (MITRIDAE)
- thiarella, Crassispira thiarella L.C. Kiener, 1840 - syn of: Crassispira nigerrima (G.B. I Sowerby, 1834) - (PSEUDOMELATOMIDAE)
- thiarella, Thiara thiarella (J.B.P.A. Lamarck) - (THIARIDAE)
- thiarella, Voluta thiarella J.B.P.A. Lamarck, 1811 - syn of: Voluta musica thiarella J.B.P.A. Lamarck, 1811 - (VOLUTIDAE)
- thiarella, Voluta musica thiarella J.B.P.A. Lamarck, 1811 - (VOLUTIDAE)
- thiarella aequistriatum, Granulolabium thiarella aequistriatum (G.P. Deshayes, 1864 †) - (BATILLARIIDAE) (FOSSIL)
- THIARIDAE Gill, 1871 - Family (GASTROPODA-CAENOGASTROPODA [Subclass]-CERITHIOIDEA [Superfamily])
- Thiarinella, Subgenus Metulella (Thiarinella) Sacco, 1890 † (COLUMBELLIDAE) (FOSSIL)
- Thiarinelle, syn of: Genus Mitrella A. Risso, 1826 (COLUMBELLIDAE)
- thiasotes, Mangelia thiasotes J.C. Melvill & R. Standen, 1896 - syn of: Daphnella thiasotes (J.C. Melvill & R. Standen, 1896) - (MANGELIIDAE)
- thiasotes, Daphnella thiasotes (J.C. Melvill & R. Standen, 1896) - (RAPHITOMIDAE)
- Thiatira, syn of: Genus Lucinoma W.H. Dall, 1901 (LUCINIDAE)
- thibaudei, Tritonidea thibaudei M.A. Peyrot, 1927 † - syn of: Pollia aquitanensis (M.A. Peyrot, 1924 †) - (BUCCINIDAE) (FOSSIL)
- thibetanus, Mirus thibetanus (P.M. Heude, 1882) - (ENIDAE)
- thibetiana, Synprosphyma thibetiana (G.P. Deshayes, 1870) - (CLAUSILIIDAE)
- thiedei, Paradrobacia thiedei (W.R. Schlickum & F. Strauch, 1979 †) - (HELICIDAE) (FOSSIL)
- thiedei, Josephinella thiedei W.R. Schlickum & F. Strauch, 1979 † - syn of: Paradrobacia thiedei (W.R. Schlickum & F. Strauch, 1979 †) - (HELICIDAE) (FOSSIL)
- Thielarion, Genus Thielarion J.J. Van Mol, 1970 (UROCYCLIDAE)
- Thielea, Genus Thielea H. Strebel, 1908 (LIMACINIDAE)
- Thieleella, syn of: Genus Anatoma S. Woodward, 1859 (ANATOMIDAE)
- Thieleherpia, Genus Thieleherpia L. Salvini-Plawén, 2004 (RHIPIDOHERPIIDAE)
- thielei, Amphitretus thielei C.W. Robson, 1930 - (AMPHITRETIDAE)
- thielei, Assiminea thielei R.T. Abbott, 1958 - (ASSIMINEIDAE)
- thielei, Antarctodomus thielei (A.W.B. Powell, 1958) - (BUCCINIDAE)
- thielei, Chlanificula thielei A.W.B. Powell, 1958 - (BUCCINIDAE)
- thielei, Falsimargarita thielei (C. Hedley, 1916) - (CALLIOSTOMATIDAE)
- thielei, Baudinella thielei F. Köhler, 2011 - (CAMAENIDAE)
- thielei, Afrocardium thielei E. Fischer-Piette, 1977 - syn of: Afrocardium exochum (J.C. Melvill, 1907) - (CARDIIDAE)
- thielei, Joculator thielei M. Jay & J. Drivas, 2002 - (CERITHIOPSIDAE)
- thielei, Sclerochiton thielei E.A. Ashby, 1923 - syn of: Squamopleura miles (P.P. Carpenter in H.A. Pilsbry, 1893) - (CHITONIDAE)
- thielei, Leptocollonia thielei A.W.B. Powell, 1951 - (COLLONIIDAE)
- thielei, Cyclochlamys thielei A.W.B. Powell, 1958 - syn of: Cyclochlamys gaussiana (K.H.J. Thiele, 1912) - (CYCLOCHLAMYDIDAE)
- thielei, Eclogavena quadrimaculata thielei (F.A. Schilder & M. Schilder, 1938) - (CYPRAEIDAE)
- thielei, Amaea thielei (M.E.A. de Boury, 1913) - (EPITONIIDAE)
- thielei, Stilapex thielei (R. Sturany, 1903) - (EULIMIDAE)
- thielei, Fusinus thielei (M.M. Schepman, 1911) - (FASCIOLARIIDAE)
- thielei, Cadulus thielei H.P. Plate, 1908 - (GADILIDAE)
- thielei, Tripoplax thielei (B.I. Sirenko, 1975) - (ISCHNOCHITONIDAE)
- thielei, Lepidopleurus thielei Sulc, 1934 - syn of: Parachiton africanus (H.F. Nierstrasz, 1906) - (LEPTOCHITONIDAE)
- thielei, Pseudorhaphitoma thielei R.N. Kilburn, 1993 - (MANGELIIDAE)
- thielei, Oenopota thielei A.W.B. Powell, 1951 - syn of: Belalora cunninghami (E.A. Smith, 1881) - (MANGELIIDAE)
- thielei, Bactrocythara thielei J. Knudsen, 1952 - syn of: Bactrocythara labiosa (E.A. Smith, 1872) - (MANGELIIDAE)
- thielei, Antimargarita thielei C. Hedley, 1916 - syn of: Falsimargarita thielei (C. Hedley, 1916) - (MARGARITIDAE)
- thielei, Turritellopsis thielei A.W.B. Powell, 1951 - (MATHILDIDAE)
- thielei, Kurtiella thielei M. Huber, 2015 - (MONTACUTIDAE)
- thielei, Nassarius thielei A.A. Olsson, 1964 † - (NASSARIIDAE) (FOSSIL)
- thielei, Neoteuthis thielei A. Naef, 1921 - (NEOTEUTHIDAE)
- thielei, Verilarca thielei (H.G. Schenck & N.W. Reinhart, 1938) - (NOETIIDAE)
- thielei, Striarca thielei H.G. Schenck & N.W. Reinhart, 1938 - syn of: Verilarca thielei (H.G. Schenck & N.W. Reinhart, 1938) - (NOETIIDAE)
- thielei, Nucula thielei H.G. Schenck, 1939 - (NUCULIDAE)
- thielei, Benthoctopus thielei C.W. Robson, 1932 - (OCTOPODIDAE)
- thielei, Odontostomus thielei (H.A. Pilsbry, 1930) - (ODONTOSTOMIDAE)
- thielei, Cyclopecten thielei A.W.B. Powell, 1958 - syn of: Cyclochlamys gaussiana (K.H.J. Thiele, 1912) - (PROPEAMUSSIIDAE)
- thielei, Pseudoliva thielei Bohm, 1926 † - (PSEUDOLIVIDAE) (FOSSIL)
- thielei, Syrnola thielei (P. Dautzenberg, 1912) - (PYRAMIDELLIDAE)
- thielei, Pyrgiscus thielei J.J. Van Aartsen & J.X. Corgan, 1996 - (PYRAMIDELLIDAE)
- thielei, Minolia thielei C. Hedley, 1916 - syn of: Falsimargarita thielei (C. Hedley, 1916) - (SOLARIELLIDAE)
- thielei, Bankia thielei G.F. Roch, 1935 - syn of: Bankia rochi C.E. von Moll, 1931 - (TEREDINIDAE)
- thielei, Viriola thielei K.H. Barnard, 1963 - (TRIPHORIDAE)
- thielei, Gemmula thielei H.J. Finlay, 1930 - (TURRIDAE)
- thienemanni, Philalanka thienemanni B. Rensch, 1932 - (ENDODONTIDAE)
- Thierachella, Genus Thierachella Fischer, 1969 † (RISSOIDAE) (FOSSIL)
- thierachensis, Mesolinga thierachensis Fischer, 1969 † - (LUCINIDAE) (FOSSIL)
- thierachensis, Trigonia thierachensis Fischer, 1969 † - (TRIGONIIDAE) (FOSSIL)
- thierensi, Buccinum thierensi J.A.H. Bosquet, 1859 † - syn of: Keepingia gossardii (P. Nyst, 1836 †) - (BUCCINIDAE) (FOSSIL)
- thierensi, Callucina thierensi (Hébert, 1849 †) - (LUCINIDAE) (FOSSIL)
- thierryi, Miniaceoliva efasciata thierryi E.J. Petuch & R.F. Myers, 2014 - (OLIVIDAE)
- thiesae, Dreissena thiesae É.A.A. Locard, 1893 - syn of: Dreissena carinata (R.W. Dunker, 1853) - (DREISSENIDAE)
- thiessae, Anodonta thiessae J.R. Bourguignat, 1881 - syn of: Anodonta cygnea (C. Linnaeus, 1758) - (UNIONIDAE)
- Thiessea, Subgenus Chilostoma (Thiessea) W. Kobelt, 1904 (HELICIDAE)
- thiesseae, Albinaria thiesseae (O. Böttger, 1880) - (CLAUSILIIDAE)
- thiesseae, Galba thiesseae S. Clessin, 1879 - syn of: Galba truncatula (O.F. Müller, 1774) - (LYMNAEIDAE)
- thiesseana, Albinaria grisea thiesseana (O. Böttger, 1883) - (CLAUSILIIDAE)
- thiesseana, Dianella thiesseana (W. Kobelt, 1878) - (HYDROBIIDAE)
- thiesseana, Vivipara thiesseana J.R. Bourguignat, 1880 - syn of: Viviparus ater G.J. De Cristofori & G. Jan, 1832 - (VIVIPARIDAE)
- thiesseanus, Jaminia thiesseanus (C.A. Westerlund, 1879) - (ENIDAE)
- thieuloidis, Bochianites thieuloidis Canto Chapa, 1976 † - (BOCHIANITIDAE) (FOSSIL)
- thieuloyi, Abrytusites thieuloyi Vasicek & Michalik, 1969 † - (DESMOCERATIDAE) (FOSSIL)
- thieuloyi, Umgazaniceras thieuloyi Klinger & J. Kennedy, 1979 † - (HIMANTOCERATIDAE) (FOSSIL)
- thikense, Trichotoxon thikense B. Verdcourt, 1951 - (UROCYCLIDAE)
- thikensis, Maizania hildebrandti thikensis B. Verdcourt, 1964 - (MAIZANIIDAE)
- thila, Pusia thila H. Turner, S. Gori & R. Salisbury, 2007 - (COSTELLARIIDAE)
- Thilea, syn of: Genus Thielea H. Strebel, 1908 (LIMACINIDAE)
- thileniusi, Acanthochitona thileniusi (K.H.J. Thiele, 1909) - (ACANTHOCHITONIDAE)
- thilensis, Ocenebra thilensis A.E.M. Cossmann & M.A. Peyrot, 1923 † - (MURICIDAE) (FOSSIL)
- thiniensis, Thiniites thiniensis Krystyn, 1982 † - (TIBETITIDAE) (FOSSIL)
- Thiniites, Genus Thiniites Krystyn , 1982 † (TIBETITIDAE) (FOSSIL)
- thiollierei, Crioceratites thiollierei Leveillé, 1837 † - (CRIOCERATITIDAE) (FOSSIL)
- thiollierei, Crioceratites thiollierei Kakabadze & Thieuloy, 1991 † - syn of: Paracrioceras cabreraense (Kakabadze & Hoedemaeker, 2004 †) - (CRIOCERATITIDAE) (FOSSIL)
- thiollierei, Honnoratia thiollierei (Astier, 1851 †) - (EMERICICERATIDAE) (FOSSIL)
- thiollierei bituberculata, Honnoratia thiollierei bituberculata Sarkar, 1955 † - (EMERICICERATIDAE) (FOSSIL)
- thiollieri, Cenoceras thiollieri Tinant, 1998 † - (CENOCERATIDAE) (FOSSIL)
- thiollieri, Planorbarius thiollieri (A. Michaud, 1855 †) - (PLANORBIDAE) (FOSSIL)
- thionipta, Bathyaustriella thionipta E.A. Glover, D.W. Taylor & Rowden, 2004 - (LUCINIDAE)
- thiophila, Rasta thiophila (D.W. Taylor & E.A. Glover, 1997) - (LUCINIDAE)
- thiriotae, Monophorus thiriotae P. Bouchet, 1985 - (TRIPHORIDAE)
- thirriae, Harpagodes thirriae (Contejean, 1859 †) - (HARPAGODIDAE) (FOSSIL)
- thirsae, Odontogryphaea thirsae (W.M. Gabb, 1862 †) - (OSTREIDAE) (FOSSIL)
- thisbe, Hemiplecta thisbe (E.A. Smith, 1895) - (ARIOPHANTIDAE)
- thisbe, Axelella thisbe (A.A. Olsson, 1964 †) - (CANCELLARIIDAE) (FOSSIL)
- thisbe, Surcula thisbe E.A. Smith, 1906 - syn of: Comitas thisbe (E.A. Smith, 1906) - (CLAVATULIDAE)
- thisbe, Comitas thisbe (E.A. Smith, 1906) - (PSEUDOMELATOMIDAE)
- thisbe, Pleurotoma thisbe E.A. Smith, 1906 - syn of: Comitas thisbe (E.A. Smith, 1906) - (TURRIDAE)
- thisbe diomedea, Comitas thisbe diomedea A.W.B. Powell, 1969 - (PSEUDOMELATOMIDAE)
- Thisbites, Genus Thisbites Mojsisovics , 1893 † (THISBITIDAE) (FOSSIL)
- THISBITIDAE Spath, 1951 † - Family (CEPHALOPODA-AMMONOIDEA [Subclass]-CERATITIDA [Order]-TROPITOIDEA [Superfamily]) (FOSSIL)
- thisphila, Astarte thisphila L.C. Glenn, 1904 † - (ASTARTIDAE) (FOSSIL)
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