Trochus transenna C. Linnaeus, 1758
Clanculus tricarinata J.B.P.A. Lamarck, 1822
Trochus tricarinatus (FOSSIL) Klipstein, 1843 † Italy, Trentino-Alto Adige, Bolzano
Trochus tricatenatus L.A. Reeve, 1861 Indo-Pacific
Austrocochlea tricingulata (A. Adams, 1853) Philippines
Clanculus tricingulatus (FOSSIL) N.H. Ludbrook, 1978 † West Australia, Northhampton8 mm
Jujubinus trilloi C. Smriglio, A. Di Giulio& P. Mariottini, 2014 West of Sicily Island, Skerki bank6 mm
Austrocochlea trochlea (W. Wood, 1828)
Conotalopia tropicalis (C. Hedley, 1907) Queensland
Gibbula tryoni H.A. Pilsbry, 1889 South Africa11 mm
Microtis tuberculata H. Adams & A. Adams, 1850 Australia, Broome22 mm
Gibbula tumida (G. Montagu, 1803) France, Brittany9 mm
Jujubinus tumidulus (A. Aradas, 1846) Malta5,8 mm
Phorcus turbinatus (I. von Born, 1778) France South29 mm
Gibbula turbinoides (G.P. Deshayes, 1835) Spain4 mm
Cantharidus turneri (A.W.B. Powell, 1939) Magellan Strait7,7 mm
Gibbula umbilicalis (E.M. Da Costa, 1778) Ireland15 mm
Gibbula umbilicaris (C. Linnaeus, 1758) Italy, Lipari Island16 mm
Gibbula umbilicaris latior T.A. de M. Monterosato,1878 Tunisia, Gulf Gabes22,3 mm
Gibbula umbilicaris nebulosa (R.A. Philippi, 1848) Turkey, Bozcaada Island14 mm
Clanculus undatoides J.E. Tenison-Woods, 1879 Australia, Botany Bay10 mm
Clanculus undatus (J.B.P.A. Lamarck, 1816) Australia, Albany25,7 mm
Stomatella ungula (C. Hedley, 1907) Queensland
Pseudostomatella unicarinata J.T. Kuroda
Dimorphotectus unicarinatus (FOSSIL) J. Szabo, 1981 † Hungary, Veszprém
Jujubinus unidentatus (R.A. Philippi, 1844) Tunisia, Djerba Island10 mm
Cantharidus urbanus (A.A. Gould, 1861) Philippines, Olango Island8 mm
Gibbula vanwalleghemi G.T. Poppe, S.P. Tagaro& H. Dekker, 2006 Philippines, Balicasag Island2,2 mm
Gibbula varia (C. Linnaeus, 1758) Greece, Evia Island11 mm
Gibbula varia mocquerisi (P.M. Pallary, 1912) Canary Islands7,5 mm
Stomatella varia Adams, 1850 Philippines, Negros Island4 mm
Monilea variabilis A. Adams, 1853 India, Tamil Nadu
Oxystele variegata (H.E. Anton, 1838) South Africa, Cape19 mm
Fossarina variegata (A. Adams, 1855)
Fagnastesia venefica (FOSSIL) (R.A. Philippi, 1887 †) Chile, Navidad Formation16,5 mm