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SEXUALLY DIMORPHIC HETERODONTOSAURIDS (OR THE LACK THEREOF)



Alessandro Marisa wrote:
<<>>
 
Berislav Krzic replied with:
<>>

I suggest to all of to look at the original papers in this case, and not rely
on the drawing in Norman 1985 which supposedly represents an Abrictosaurus
skull.  It isn't Abrictosaurus at all, just Heterodontosaurus without tusks.

Abrictosaurus doesn't look a whole heck of a lot like Heterodontosaurus and is
almost certainly distinct from H. tucki.  Weather this is a specific
seperation as Thulborn supports, as he refers A. consors, H. Tucki, and L.
angustidens into the same genus: Lycorhinus; or if it is generic as others
support, where each species has its own genus is an argument for semantics...

First of all it should be stated that Abrictosaurus doesn't lack all its
fangs.  It does have the last two premaxillary teeth which are conical and
fang like as in other heterodontosaurids and pachycephalosaurs.  The hub-ub is
all about the fact that it lacks the fang in dentary position one which fits
into the arched premxillary-maxillary diastema, and its premaxillary fangs are
small.

Abrictosaurus was originally described (as Lycorhinus consors) in:

Thulborn, R S.  1974.  A new heterodontosaurid dinosaur (Reptilia:
Ornithischia) from the Upper Triassic Red Beds of Lesotho.  Zoological Journal
of the Linnean Society 55:151-175.

Either look in that paper or in the Dinosaur Society's book (yuck) and see
Tracy Ford's illustration.

Peter Buchholz
Tetanurae@aol.com