Species: gregori DeMAR JR, JONES & CARRANO, 2022
Etymology: In honor of Joseph Gregor, a dedicated Smithsonian volunteer who skillfully prepared teh holotype and referred specimens.
Holotype: USNM PAL 772041
Locality: USNM Loclaity 42188 (Fox Mesa Locality), Big Horn County, Wyoming.
Horizon: Morrison Formation.
Biostratigraphy:
Age: Kimmeridgian or Tithonian Stage, Malm Epoch, Late Jurassic.
Material: An articualted partial skull and skeleton.
Referred material:
USNM PAL 720475: Partial skull (left maxilla, jugal, quadrate, and palatine; part of right palatine) and lower jaw (left dentary, angular, surangular, articular and prearticular).
USNM PAL 720475: Partial right dentary wiht 4 teeth.
USNM PAL 720479: Partial atlas/axis complex.