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Tawa hallae: everything you know about basal saurischians is wrong...

Okay, it is after 2 pm, so...

Introducing Tawa hallae:

Nesbitt, S. J., Smith, N. D., Irmis, R. B., Turner, A. H., Downs, A., and M.
A. Norell. 2009. A complete skeleton of a Late Triassic saurischian and the
early evolution of dinosaurs. Science 326:1530-1533.

By adding this new taxon--known from multiple nearly complete
skeletons--into their matrix, the authors find:

         |  `--+--Chindesaurus
         |     `--Herrerasaurus
                  |--+--"S." kayentakatae
                  |  `--Coelophysis

Thomas R. Holtz, Jr.
Email: tholtz@umd.edu   Phone: 301-405-4084
Office: Centreville 1216                        
Senior Lecturer, Vertebrate Paleontology
Dept. of Geology, University of Maryland
Fax: 301-314-9661               

Faculty Director, Earth, Life & Time Program, College Park Scholars
Faculty Director, Science & Global Change Program, College Park Scholars
Fax: 301-314-9843

Mailing Address:        Thomas R. Holtz, Jr.
                        Department of Geology
                        Building 237, Room 1117
                        University of Maryland
                        College Park, MD 20742 USA