Species: trux ROMER & PRICE, 1940
Etymology:

Holotype: AMNH 4780

Locality: El Cobre Canyon, near Albiquiu, Rio Arriba County, New Mexico.

Horizon: Abo/Cutler Formation, Cutler Group.

Biostratigraphy:

Age: Wolfcampian, Lower Rotliegendes Epoch, Early Permian.

Material: Maxilla, quadrate, 12 partial vertebrae and partial ribs.

Baldwinonus trux AMNH 4780 after ROMER & PRICE, 1940: A) incomplete right maxilla; B) internal view of anterior port of the right maxilla; C) lateral view of a dorsal vertebra and D) anterior end of centrum.

Hypothetical skull of Baldwinonus trux AMNH 4780 after ROMER & PRICE, 1940.
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Species: ? dunkardensis ROMER, 1952
Etymology:

Holotype: 8540

Locality: Locality 6, Ohio River drainage, near Cameron, Monroe County, Ohio.

Horizon: Washington Formation, Dunkard Group.

Biostratigraphy:

Age: Wolfcampanian stage, upper lower to lower middle Rotliegendes Epoch, Early Permian.

Material: Fragmentary right maxilla.