Splenditrigonia splendida (FOSSIL) (A. F. Leanza, 1941) †
Weaverella steinmanni (FOSSIL) (Philippi, 1899) †
Steinmanella subquadrata (FOSSIL) Luci & Lazo, 2012 †
Steinmanella transitoria (FOSSIL) (Steinmann, 1881 †) Argentina, Río Negro, El Cuy
Popenoella tryoniana (FOSSIL) (Gabb, 1864) †
Steinmanella vacaensis (FOSSIL) Weawer, 1931 † Argentina, Neuquén
Transitrigonia vacaensis (FOSSIL) (Weaver, 1931) †
Steinmanella vyschetzkii (FOSSIL) (Cragin 1893) †
Yaadia whiteavesi (FOSSIL) (Packard, 1921) †