Trigonia tepsikhaensis (FOSSIL) Bogdanova & Yanin, 2005 †
Latitrigonia tetoriensis (FOSSIL) Kobayashi, 1957 †
Trigonia thetis (FOSSIL) R.A. Philippi, 1899 †
Trigonia thierachensis (FOSSIL) Fischer, 1969 †
Trigonia transitoria (FOSSIL) Steinmann, 1881 †
Kitchingonia trapeziformis (FOSSIL) (Kitchin, 1903) †
Maoritrigonia trechmanni (FOSSIL) Fleming, 1987 †
Trigonia tuarensis (FOSSIL) Saveliev, 1960 †
Eotrigonia tubulifera (FOSSIL) (R. Tate, 1885 †)
Eselaevitrigonia tyna (FOSSIL) Skwarko, 1981 †
Latitrigonia unicarinata (FOSSIL) Kobayashi & Tamura,1957 †
Neotrigonia uniophora (Gray, 1847)
Latitrigonia unituberculata (FOSSIL) Kobayashi & Tamura,1957 †
Psilotrigonia vegaensis (FOSSIL) A.M. Pérez & al., 2008 †
Trigonia vicaryana (FOSSIL) Lycett †
Nambangonia vstriata (FOSSIL) (Aitken, 1961) †
Trigonia vyschetzkii (FOSSIL) Cragin, 1905 †
Maoritrigonia waddicki (FOSSIL) Fleming, 1987 †
Trigonia walfordi (FOSSIL) Lycett, 1883 †
Trigonia weaveri (FOSSIL) Stoyanow, 1949 †
Eselaevitrigonia wellmani (FOSSIL) C.A. Fleming, 1987 †
Trigonia wiedmanni (FOSSIL) H.A. Leanza & Garate,1983 †
Trigonia wightensis (FOSSIL) Strand †
Trigonia windoesi (FOSSIL) Lycett, 1883 †
Protrigonia yunnanensis (FOSSIL) (Guo Fu-xiang, 1985) †
Psilotrigonia zealandica (FOSSIL) Fleming, 1987 †
Modesticoncha zlambachensis (FOSSIL) (F. Haas, 1909 †)
Trigonia zonata (FOSSIL) A.E.R. Agassiz, 1840 †