Species: vesperus BERMAN, REISZ & EBERTH, 1987
Holotype: CM 41711
Locality: NMMNH Locality 5378, El Cobre Canyon, 11 km northwest of Abiquiu, approximately Lat 36°18'16", N and Long 106°20'52", Rio Arriba County, north-central New Mexico.
Horizon: El Cobrte Canyon Formation, Cutler Group. (old Lower Cutler Formation.)
Age: Cobrean, Gzelian Epoch, Early Late Pennsylvanian.
Material: Fragmentary skull and fragmentary skeleton.
Paratype: CM 28590: Right margin of the skull with closely joined mandible.