R: Late J Heterodontosaurs (was Re: Sereno's Prosauropoda)

["Alessandro Marisa" <amaris@tin.it>]

-----Messaggio originale-----
Da: Thomas R. Holtz, Jr. <th81@umail.umd.edu>
A: TWILLIAMS@canr1.cag.uconn.edu <TWILLIAMS@canr1.cag.uconn.edu>
Cc: dinosaur@usc.edu <dinosaur@usc.edu>
Data: giovedì 8 luglio 1999 22.10
Oggetto: Late J Heterodontosaurs (was Re: Sereno's Prosauropoda)


>At 12:49 PM 7/8/99 -0500, Tim Williams wrote:
>>On a totally separate issue, I noticed in Sereno's Evolution paper that
the
>>range of the Heterodontosauridae is given as extending to the end of the
>>Jurassic.  Is this news to anyone else?  I wasn't aware of any
>>heterodontosaurid material from the Late Jurassic.

>In his 1997 paper in Annual Review of Earth and Planetary Sciences (25:
>435-489), Sereno considers the Late Jurassic English dinosaur _Echinodon_ a
>heterodontosaurid (as he earlier suggested in JVP 11: 168-197).  The
>heterodontosaurid features of _Echinodon_ have not been published yet, to
my
>knowledge.
>I do look forward to seeing some day a nice global analysis of the basal
>relationships of Ornithischia incorporating recent discoveries, to test if
>(for example) heterodontosaurids really are closer to euornithopods, or to
>marginocephalians as a whole, or some subgroup of these, or outside
>"euornithopods" + marginocephalians, or...


For me the Heterodontosauridae is closer to Marginocephalia than to
Euornithopoda, infact the three caniniform teeth are present only in the
Marginocephalia (Protoceratopsidae and Pachycephalosauria) and not in
Euornithopoda.

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