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1) Do any other archosaurs (non-dinosaurs) have the acetabulum (a
hole in the hip girdle, created by the intersection of the three hip bones)
as a character?
2) Does the description/definition of a dinosaur indicate that the
supra-acetabular crest must be present?
3) Are there instances in dinosauria where the acetabulum has
closed/sealed up (i.e fused the hip bones together), as we see the closure
of fenestrae in Ceratopsians, and Ankylosaurs?
4) Did ALL dinosaurs have digitigrade stance (i.e. they walked on
"tiptoe")? - Or were some "flat-footed"?