Trigonia saavedra (FOSSIL) Stoyanow, 1949 †
Nipponitrigonia sakamotoensis (FOSSIL) (Yehara, 1921) †
Myophorigonia salasi (FOSSIL) Alencaster, 1961 †
Trigonia scabricola (FOSSIL) (Lycett) †
Trigonia scapha (FOSSIL) A.E.R. Agassiz, 1840 †
Eotrigonia semiundulata (FOSSIL) (B.W. Jenkins, 1865 †)
Trigonia senex (FOSSIL) Kobayashi & A. Mori,1954 †
Jaworskiella siemonmulleri (FOSSIL) Poulton, 1979 †
Trigonia signicollina (FOSSIL) Fleming, 1987 †
Trigonia similis (FOSSIL) A.E.R. Agassiz, 1840 †
Indotrigonia smeeii (FOSSIL) (J. de C. Sowerby,1840) †
Trigonia somaliensis (FOSSIL) Stefanini, 1939 †
Maoritrigonia sparsicostata (FOSSIL) A.M. Pérez & Reyes,1994 †
Ghuneriella spissicostata (FOSSIL) (Kitchin, 1903) †
Trigonia stantoni (FOSSIL) L.W. Stephenson, 1941 †
Trigonia stelzneri (FOSSIL) Gottsche, 1878 †
Trigonia stolleyi (FOSSIL) J. Hill, 1893 †
Neotrigonia strangei (Adams, 1854)
Trigonia suborbicularis (FOSSIL) E. Forbes, 1846 †
Trigonia subtriangularis (FOSSIL) Wetzel, 1911 †
Trigonia sulcata (FOSSIL) J. Hector, 1874 †
Trigonia sulcata (FOSSIL) (Hermann, 1781 †)
Trigonia sulcifera (FOSSIL) R.A. Philippi, 1899 †
Trigonia sumiyagura (FOSSIL) T. Kobayashi & Y. Kaseno,1947 †
Jaworskiella supleiensis (FOSSIL) Poulton, 1979 †
Trigonia suprajurensis (FOSSIL) A.E.R. Agassiz, 1840 †
Minetrigonia suttonensis (FOSSIL) (W.F. Clapp & Shimer,1911 †)
Pacitrigonia sylvesteri (FOSSIL) J. Marwick, 1932 †
Trigonia taffi (FOSSIL) Cragin, 1893 †
Kumatrigonia tanourensis (FOSSIL) (Tamura, 1959 †)
Frenguelliella tapiai (FOSSIL) A. Lambert, 1944 †
Mesotrigonia tarameahensis (FOSSIL) S. Freneix, 1958 †
Trigonia tealbyensis (FOSSIL) Lycett †
Coxitrigonia tealei (FOSSIL) (Cox, 1937) †
Trigonia tenuicosta (FOSSIL) Lycett †