Species: robustus RASMUSSEN & CALLISON, 1981
Etymology:

Holotype: LACM 120462

Locality: 4.8 km WSW Fruita, Fruita Paleontological Area, U.S. Bureau of Land Management, S1/2 sec. 13, N1/2 sec. 24, T1N, R3W, Ute Principle Meridian, Mesa County, Colorado.

Horizon: Uppermost part of the Salt Wash Member, Morrison Formation.

Biostratigraphy: Zone 2.

Age: Comobluffian age, Kimmeridgian Stage, Middle Malm Epoch, Late Jurassic.

Material: Right mandible missing the anterior tip.

Referred material:

FORSTER, 2003b

Locality: Dry Mesa Quarry 1, sec. 23, T.50N, R.14, on the Uncompahgre Plateau, Mesa County, Western Colorado.

Horizon: Lower Upper Brushy Basin Member, Morrison Formation.

Biostratigraphy: Zone 2.

Age: Lower Part, Comobluffian age, Kimmeridgian Stage, uppermost Malm Epoch, Late Jurassic.

Material:

BYU 11460: Dentary fragment with 7 teeth.

 

Locality: Westwater Canyon, Utah.

Horizon: Member?, Morrison Formation.

Biostratigraphy: Zone?

Age: Age?, Kimmeridgian Stage, uppermost Malm Epoch, Late Jurassic.

Material:

MWC 2907: Fragment of right dentary with 6 teeth.

Locality: Uravan, Montrose County, Colorado.

Horizon: Member?, Morrison Formation.

Biostratigraphy: Zone?

Age: Age?, Kimmeridgian Stage, uppermost Malm Epoch, Late Jurassic.

Material:

MWC 1200: Left maxilla fragment with 5 teeth.

 

Locality: Green Acres, Montrose County, Colorado.

Horizon: Member?, Morrison Formation.

Biostratigraphy: Zone?

Age: Age?, Kimmeridgian Stage, uppermost Malm Epoch, Late Jurassic.

Material:

DMNH EPV 10685: Right dentary fragment with 7 teeth, left dentary fragment with 6 teeth, left maxilla fragment with 4 teeth, right maxilla fragment with 3 teeth, 2 unidentified elements with teeth, unworn isolated tooth, plus many fragments.