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.

 

HARIDY, FREDERICKSON, PETERSON, MILLER, DAVIS, CURTICE, HUNTER & CIFELLI, 2026

Locality: Bone Cabin Quarry (BCQ) Albay County, Wyoming.

Horizon: Brushy Basin Member, Morrison Formation.

Biostratigraphy: Zone 3.

Age: Upper Part, Comobluffian age, Kimmeridgian Stage, Uppermost Malm Epoch, Late Jurassic.

Material:

TPI-1014: Rear half of an articuladed skull from the caudal end of teh maxilla to the occiput.

 

Locality: Near Westwater, Eastern Grand County, Utah.

Horizon: Brushy Basin Member, Morrison Formation.

Biostratigraphy: Zone 3.

Age: Upper Part, Comobluffian age, Kimmeridgian Stage, Uppermost Malm Epoch, Late Jurassic.

Material:

Material:

OMNH 80525: Right maxilla, mostly complete left and partial right palatine, partial right jugal, partial braincase (e.g., basioccipital), right and left quadrate-quadratojugla, partial right and left squamosal, nearly complete right and partial left dentaries, partial left and right scapulocoracoid, complte left and right humerus, left radius, left ulna, right femur, left tibia and tarsal IV, partial atlas-axis complex, and multiple partial skull pieces, vertebrae , metapodials and ribs.

OMNH 81071: Partial dentary, maxilla, and palatine, partial right humerus, complte right and partial left ulna, partial rigth and left radius, complete left and rigth femur and tibia, ?tarsal IV, partial left and right ischium, and multiple partial skull pieces, vertebrae, metapodials, and ribs.