Species: isaaci COPE, 1880
Etymology:

Holotype: AMNH 4346

Locality: Texas.

Horizon: Wichita Group.

Biostratigraphy:

Age: Early Permian.

Material: Articulated left premaxilla and maxilla, portions of the adjoining lacrimal, jugal, palatine and ectopterygoid of a juvenle.

Referred material:

= ?Helodectes paridens COPE, 1880
Etymology:

Holotype: MCZ 9331

Locality: Texas.

Horizon: Wichita Group.

Biostratigraphy:

Age: Early Permian.

Material: Left maxilla and possibly a premaxilla, and lower jaw fragment of a juevnile.