Pliciphaedusa tosana (H.A. Pilsbry, 1901)
Megalophaedusa toshiyukii H. Minato & T. Habe, 1983
Streptodera trachelostropha (O.F. von Möllendorff,1885)
Clausilia tragica J.T. Kuroda
Nenia tridens (A. Schweigger, 1820)
Incania trigonostoma (O. Böttger, 1880)
Cochlodina triloba (O. Böttger, 1870)
Stereophaedusa tripleuroptyx H.A. Pilsbry, 1909
Oospira triptyx H. Nordsieck, 2011
Balea tristensis J.E. Gray, 1824
Mauritanica tristrami (L. Pfeiffer, 1861)
Mauritanica tristrami philora (A. Letourneux, 1887)
Cretica troglodytes (A. Schmidt, 1868)
Cretica troglodytes niproensis H. Nordsieck, 2004
Cretica troglodytes subvirginea (O. Böttger, 1883)
Cretica troglodytes vexans (O. Böttger, 1883)
Serrulastra trolli (FOSSIL) H. Nordsieck, 1981 †
Serrulella truci (FOSSIL) (Nordsieck, 1972 †)
Armenica truncata E. Neubert, 1992
Oospira truncatula Hunyadi & Szekeres, 2016
Stereophaedusa tryoni H.A. Pilsbry, 1901
Stereophaedusa tryoni miyakejimana H.A. Pilsbry, 1905
Laciniaria tschetschenica L. Pfeiffer, 1866
Indonenia tuba (S.C.T. Hanley, 1868.)
Serrulastra tuchoricensis (FOSSIL) M. Harzhauser, T.A. Neubauer& al., 2014 †
Serruplica tuchoricensis (FOSSIL) (Z. Frankenberger,1914 †)
Pyrostoma tumida (B. Zieglerin E.A. Rossmässler, 1836)
Galeata tumluensis H. Nordsieck, 1994
Castelliana tunievi (A.N. Suvorov, 2002)
Cristataria turcica E. Neubert, 1993
Vestia turgida (B. Zieglerin E.A. Rossmässler, 1836)
Vestia turgida procera (E.A. Bielz, 1853)
Albinaria turrita (L. Pfeiffer, 1850)
Caucasica tuschetica (I.M. Likharev & Lejava,1961)
Megalophaedusa ujiguntoensis H. Minato, 1982