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RE: Frenguellisaurus ischigualastensis
Another case maybe of curiousity killing the cat here...I'm wondering if
there's any definite relationship between Frenguellisaurus and Allosaurs
or Megalosaurs or Giganotosaurus, etc.
_Frenguellisaurus_ was synonymized with _Herrerasaurus_
_ischigualstensis_ by Novas (1993):
Novas, F. 1993. New information on the systematics and postcranial
morphology of _Herrerasaurus_ ischigualstensis_ (Therapoda:
Herrerasauridae) from the Ischugualsto Formation (late Triassic)
of Argentina. Journal of Vertebrate Paleontology13:400-424.
Also see Sereno and Nova's papers on _Herrasaurus_ in Journal of Vertebrate
Paleontology 13(4): 451-476.
So, in answer to your question, yes. It (_Herrerasaurus_) is either a
basal theropod (according to Sereno and Novas) or somewhat more primitive
dinosaur (perhaps a basal Saurischian) according to others.
Incidently, a friend of mind who does a lot of work in the Triassic read
these papers and Novas original paper describing _Frenguillosaurus_ questioned
his reasoning for changing his mind later about it being a separate genus,
although I don't remeber the details as to why.