Trigonia pseudopapillata (FOSSIL) Dickan, 1990 †
Trigonia pullus (FOSSIL) Sowerby, 1826 †
Trigonia rebouli (FOSSIL) Henry, 1876 †
Trigonia reesidei (FOSSIL) Stoyanow, 1949 †
Trigonia resoluta (FOSSIL) Stoyanow, 1949 †
Trigonia reticulata (FOSSIL) A.E.R. Agassiz, 1841 †
Trigonia rudicostata (FOSSIL) Cragin, 1905 †
Trigonia rugosicostata (FOSSIL) Saveliev, 1960 †
Trigonia saavedra (FOSSIL) Stoyanow, 1949 †
Trigonia scabricola (FOSSIL) (Lycett) †
Trigonia scapha (FOSSIL) A.E.R. Agassiz, 1840 †
Trigonia senex (FOSSIL) Kobayashi & A. Mori,1954 †
Trigonia signicollina (FOSSIL) Fleming, 1987 †
Trigonia similis (FOSSIL) A.E.R. Agassiz, 1840 †
Trigonia somaliensis (FOSSIL) Stefanini, 1939 †
Trigonia stantoni (FOSSIL) L.W. Stephenson, 1941 †
Trigonia stelzneri (FOSSIL) Gottsche, 1878 †
Trigonia stolleyi (FOSSIL) J. Hill, 1893 †
Trigonia suborbicularis (FOSSIL) E. Forbes, 1846 †
Trigonia subtriangularis (FOSSIL) Wetzel, 1911 †
Trigonia sulcata (FOSSIL) (Hermann, 1781 †)
Trigonia sulcata (FOSSIL) J. Hector, 1874 †
Trigonia sulcifera (FOSSIL) R.A. Philippi, 1899 †
Trigonia sumiyagura (FOSSIL) T. Kobayashi & Y. Kaseno,1947 †
Trigonia suprajurensis (FOSSIL) A.E.R. Agassiz, 1840 †
Trigonia taffi (FOSSIL) Cragin, 1893 †
Trigonia tealbyensis (FOSSIL) Lycett †
Trigonia tenuicosta (FOSSIL) Lycett †
Trigonia tepsikhaensis (FOSSIL) Bogdanova & Yanin, 2005 †
Trigonia thetis (FOSSIL) R.A. Philippi, 1899 †
Trigonia thierachensis (FOSSIL) Fischer, 1969 †
Trigonia transitoria (FOSSIL) Steinmann, 1881 †
Trigonia tuarensis (FOSSIL) Saveliev, 1960 †
Trigonia vicaryana (FOSSIL) Lycett †
Trigonia vyschetzkii (FOSSIL) Cragin, 1905 †