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RE: Deep Scaly Project

> From: owner-dinosaur@usc.edu [mailto:owner-dinosaur@usc.edu]On Behalf Of
> david peters
> The Field Museum is part of a project to figure out the family tree of the 
> Diapsida.
> http://www.fieldmuseum.org/deepscaly/
> I was wondering, to date who has authored the most comprehensive account of 
> this
> clade? And why does it have to be improved or further resolved?
Note that this is for Squamata only, and by no means all of Diapsida!!

And why does it have to be improved? Because there remains major contraversies 
within it (esp., but not exclusively, the position of
snakes), and because previous work tends to be less global and thus more likely 
to miss important potential groupings (i.e.,
snake-only papers, or ones with just one examplar for each "family", or the 
like). Indeed, looking at their taxon sampling, it might
be nicer to see a lot more. After all, there are more living squmate species as 
there are living mammal species!!

Furthermore, this project will combine molecular and morphological data.

To do all of Diapsida to some reasonable scale would require many times the 
number of characters and taxa here. Even to do a "all
major types of fossil diapsids, minus the modern-type lepidosaurs and 
modern-type archosaurs" would be quite an task: literally
dozens to a few hundred of taxa and many hundreds of characters.

                Thomas R. Holtz, Jr.
                Vertebrate Paleontologist
Department of Geology           Director, Earth, Life & Time Program
University of Maryland          College Park Scholars
        Mailing Address:
                Building 237, Room 1117
                College Park, MD  20742

Phone:  301-405-4084    Email:  tholtz@geol.umd.edu
Fax (Geol):  301-314-9661       Fax (CPS-ELT): 301-405-0796