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Re: A critique of Sullivan's pachycephalosaur paper,
----- Original Message -----
From: "Michael Mortimer" <email@example.com>
Sent: Tuesday, June 20, 2006 7:42 AM
Sullivan's diagnosis for Pachycephalosauridae reads like one of those
classic 'diagnoses' from the 1950's that lists symplesiomorphic or
characters in addition to synapomorphies. "Ornithischian dinosaurs with
or incipiently to fully-domed frontoparietals." So... the thickening is
that needs to be mentioned then. "Supratemporal fenestrae absent to
well-developed." Uh... this would exclude which states now?
This is apparently not _intended_ to be a diagnosis (or "definition"). It is
a description, at best a determination key. "If you see an animal that fits
this description, it probably is a pachycephalosaurid."
What it could actually be good for is another question...
[...] detailed evaluations of "Troodon" bexelli and Heishansaurus