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R: HETERODONTOSAURIDS AND BASAL CERAPOD PHYLOGENY



-----Messaggio originale-----
Da: Tetanurae@aol.com <Tetanurae@aol.com>
A: jconrad@lib.drury.edu <jconrad@lib.drury.edu>; dinosaur@usc.edu
<dinosaur@usc.edu>; TWILLIAMS@canr1.cag.uconn.edu
<TWILLIAMS@canr1.cag.uconn.edu>
Data: martedì 4 maggio 1999 6.06
Oggetto: HETERODONTOSAURIDS AND BASAL CERAPOD PHYLOGENY


>Well... Ornithischians ancestorally had 6 premaxillary teeth, thyreophyrans
>gained a seventh, and ornithischians and non-node cerapods on the cerapod
>branch have five teeth.

Perhaps, in this non-node Cerapoda on the Cerapoda  can be included
Agilisaurus louderbacki?
I have a suspect that the traditionally placement of Agilisaurus as a Basal
Ornithischia at the same level of Lesothosaurus diagnosticus is errated, the
skull of Agilisaurus is more derived from that of Lesothosaurus in some
features (es. five premaxillary teeth, absence of a maxillary fenestra). And
also the pelvis is more similar to that of Hypasilophodon than to
Lesothosaurus (es. prepubic process, obturator foramen and obturator
process).

By
Alessandro Marisa
"Voluntary of Paleontology Group of Monfalcone"
Via Achille Grandi n°18
38068 ROVERETO (TN) ITALY
Tel: 039-0464-434658 Email: amaris@tin.it