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

["Thomas R. Holtz, Jr." <th81@umail.umd.edu>]

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...

                        Thomas R. Holtz, Jr.
                        Vertebrate Paleontologist
Deptartment of Geology                  Director, Earth, Life & Time Program
University of Maryland                  College Park Scholars
College Park, MD  20742       
Webpage: http://www.geol.umd.edu        Phone:301-405-4084
Email:tholtz@geol.umd.edu               Fax:  301-314-9661