[D] Caseosaurus crosbyensis [sG] [T]
Hunt, Lucas, Heckert, Sullivan & Lockley, 1998
Triassic Late, Carnian
Tecovas Formation, Dockum Group, Crosby County, Texas, US
Genus - Typespecies
UMMP 8870, partial left ilium. Fragmentary but diagnostic material.
Taxonomic placement by Nesbitt, S.J., Irmis, R.B. and Parker, W.G. (2007): Dinosauriformes.
Remarks by Nesbitt, S.J., Irmis, R.B. and Parker, W.G. (2007): The incompleteness and equivocal distribution of present character states means that Caseosaurus cannot be unambiguously assigned to the Herrerasauridae or Dinosauria. The specimen is assignable to Dinosauriformes because it has at least a partially open acetabulum, but position within this clade is ambiguous because it lacks a brevis fossa. If Caseosaurus is assignable to Chindesaurus, itwould be a saurischian dinosaur as a consequence and the lack of a brevis fossa would represent the retention of the plesiomorphic state in some basal saurischians.