Trigonia libanensis (FOSSIL) Krumbeck, 1905 †
Trigonia lineolata (FOSSIL) A.E.R. Agassiz, 1840 †
Trigonia losadai (FOSSIL) H.A. Leanza, 1993 †
Trigonia lycetti (FOSSIL) Walford, 1885 †
Trigonia maastrichtiana (FOSSIL) Briart, 1888 †
Eselaevitrigonia macdonaldi (FOSSIL) D.P. Kelly, 1995 †
Malagasitrigonia macfarlani (FOSSIL) C.A. Fleming, 1987 †
Trigonia maloneana (FOSSIL) Stoyanow, 1949 †
Trigonia maltonensis (FOSSIL) Arkell †
Neotrigonia margaritacea (J.B.P.A. Lamarck, 1804)
Trigonia marginata (FOSSIL) Damon, 1860 †
Trigonia marwicki (FOSSIL) Fleming, 1987 †
Indotrigonia matapuana (FOSSIL) (Krenkel, 1911) †
Trigonia mearnsi (FOSSIL) Stoyanow, 1949 †
Neotrigonia medipontea (FOSSIL) T.A. Darragh, 1986 †
Eselaevitrigonia meridiana (FOSSIL) (Woods, 1917) †
Trigonia micippe (FOSSIL) R.A. Philippi, 1899 †
Guineana micrasiatica (FOSSIL) (Bittner, 1891 †)
Trigonia mirandaensis (FOSSIL) A. Lambert, 1944 †
Maoritrigonia mollesensis (FOSSIL) A.M. Pérez & Reyes,1994 †
Trigonia mollesensis (FOSSIL) A. Lambert, 1944 †
Trigonia montanaensis (FOSSIL) (F.B. Meek, 1873 †)
Coxitrigonia moorei (FOSSIL) (Lycett, 1870) †
Minetrigonia multicostata (FOSSIL) (Korner, 1937 †)
Trigonia munita (FOSSIL) Cragin, 1905 †
Neopisthotrigonia nasuta (FOSSIL) (Etheridge, 1872) †
Kumatrigonia nemtinovi (FOSSIL) Bychkov, 1985 †
Minetrigonia newtonae (FOSSIL) McRoberts, 2017 †
Trigonia northamptonensis (FOSSIL) Walford, 1885 †
Neotrigonia novaguineana (FOSSIL) Skwarko, 1967 †
Maoritrigonia nuggetensis (FOSSIL) (C.T. Trechmann, 1918 †)
Trigonia oehlerti (FOSSIL) Bigot, 1893 †
Callitrigonia offsetensis (FOSSIL) Kelly 1995 †
Austrotrigonia oliveroi (FOSSIL) F.A. Medina, 1980 †
Latitrigonia orbicularis (FOSSIL) Kobayashi, 1957 †