Trigonia orientalis (FOSSIL) E. Forbes, 1846 †
Trigonia orientalis (FOSSIL) J.H.F. Douvillé, 1916 †
Maoritrigonia otamitensis (FOSSIL) (C.T. Trechmann, 1918 †)
Eotrigonia paleocenica (FOSSIL) T.A. Darragh, 1986 †
Austrotrigonia pampeana (FOSSIL) H.A. Leanza & Casadío,1991 †
Trigonia papuana (FOSSIL) Glaessner, 1958 †
Myophorigonia parva (FOSSIL) McRoberts, 2017 †
Trigonia patchamensis (FOSSIL) Fürsich & Heinze, 1998 †
Trigonia pcelincevae (FOSSIL) Saveliev, 1960 †
Frenguelliella perezreyesi (FOSSIL) H.A. Leanza, 1993 †
Lambertitrigonia pichimoncolensis (FOSSIL) (Lambert 1944) †
Trigonia picteti (FOSSIL) Coquand, 1865 †
Maoritrigonia pirouteti (FOSSIL) (Avias, 1953 †)
Trigonia plana (FOSSIL) Repin, 2013 †
Neuquenitrigonia plazaensis (FOSSIL) A.M. Pérez & al., 2008 †
Guineana postera (FOSSIL) (F.A. von Quenstedt,1857 †)
Frenguelliella poultoni (FOSSIL) H.A. Leanza, 1993 †
Pacitrigonia praenuntians (FOSSIL) Kelly 1995 †
Austrotrigonia prima (FOSSIL) Skwarko, 1963 †
Trigonia pseudoacuta (FOSSIL) Dickan, 1990 †
Trigonia pseudocaudata (FOSSIL) J. Hector, 1886 †
Trigonia pseudomeriani (FOSSIL) Choffat, 1885 †
Trigonia pseudopapillata (FOSSIL) Dickan, 1990 †
Trigonia pullus (FOSSIL) Sowerby, 1826 †
Quadratojaworskiella pustulata (FOSSIL) Reyes & K.E. Perez,1980 †
Latitrigonia pyramidalis (FOSSIL) Kobayashi & Tamura,1957 †
Trigonia rebouli (FOSSIL) Henry, 1876 †
Trigonia reesidei (FOSSIL) Stoyanow, 1949 †
Eselaevitrigonia regina (FOSSIL) (R.O. Wilckens, 1910 †)
Trigonia resoluta (FOSSIL) Stoyanow, 1949 †
Trigonia reticulata (FOSSIL) A.E.R. Agassiz, 1841 †
Opisthotrigonia retrorsa (FOSSIL) (Kitchin, 1903) †
Neopisthotrigonia roperi (FOSSIL) (Skwarko, 1963) †
Trigonia rudicostata (FOSSIL) Cragin, 1905 †
Trigonia rugosicostata (FOSSIL) Saveliev, 1960 †