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Re: Heterodontosaurs (minor correction)
In a message dated 97-09-05 03:12:01 EDT, Dinogeorge@aol.com writes:
<< In my article for Gakken back in 1993, I used the name Heterodontosauria
denote the clade comprising heterodontosaurids and pachycephalosaurs... >>
Oops. I see I've used the term "clade" here, where it's not warranted.
Heterodontosauria is not a clade, because it doesn't contain Ceratopia, one
of its descendant groups; the clade comprising heterodontosaurids and
marginocephalians (= pachycephalosaurs and ceratopians) is unnamed (mainly
because everyone still considers heterodontosaurids to be basal ornithopods).