Genus: Diplosaurus MARSH, 1877
Etymology: Greek, diplos, "double" and Greek, sauros, "lizard."

Species: felix MARSH, 1877
Etymology:
= Goniopholis felix (MARSH, 1877)

Holotype: YPM 517

Locality: Morrison Quarry, Lakes' YPM Quarry 1, T4S, R70W, Sec. 26, Near Morrison, Colorado.

Horizon: Member? Morrison Formation.

Biostratigraphy:

Age: Stage? Epoch? Late Jurassic.

Material: Skull and vertebrae.