Trigonia chacaicoensis Lambert, 1944 † accepted as Eoanditrigonia chacaicoensis (Lambert, 1944) † (original description)
Trigonia corderoi Lambert, 1944 † (original description)
Trigonia covuncoensis Lambert, 1944 † accepted as Levytrigonia covuncoensis (Lambert, 1944) † (original description)
Trigonia fortinensis Lambert, 1944 † (original description)
Trigonia haupti Lambert, 1944 † accepted as Philippiella haupti (Lambert, 1944) † (original description)
Trigonia leanzai Lambert, 1944 † (original description)
Trigonia mirandaensis Lambert, 1944 † (original description)
Trigonia mollesensis Lambert, 1944 † (original description)
Trigonia opistolophophora Lambert, 1944 † accepted as Antutrigonia opistolophophora (Lambert, 1944) † (original description)
Trigonia pichimoncolensis Lambert, 1944 † accepted as Lambertrigonia pichimoncolensis (Lambert, 1944) † (original description)
Trigonia radixscripta Lambert, 1944 † accepted as Andivaugonia radixscripta (Lambert, 1944) † (original description)
Trigonia tapiai Lambert, 1944 † accepted as Frenguelliella chubutensis (Feruglio, 1934) † (original description)