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Re: It's HERE!!!

Mickey_Mortimer wrote (thanks Mickey!):

On pachycephalosaur phylogeny:

The synapomorphies cannot be listed due to space limitations, but the >topology is (Stenopelix (Wannanosaurus (Goyocephale (Homocephale, >Ornatotholus (Yaverlandia (Stegoceras ((Prenocephale + Tylocephale) (Stygimoloch + Pachycephalosaurus))))))))

_Yaverlandia_ is back in the Pachycephalosauria? Last year Sullivan removed it from this group, noting that the only pachycephalosaur feature he could see in the specimen were the thick frontals; in other respects, the cranium was decidedly un-pachycephalosaurian (though Sullivan didn't actually say what _Yaverlandia_ might really be).


Sullivan, R.M. (2000). Prenocephale edmontonensis (Brown and Schlaikjer) new comb. and P. brevis (Lambe) new comb. (Dinosauria: Ornithischia: Pachycephalosauria) from the Upper Cretaceous of North America (R.M. Sullivan) 177-190. In: New Mexico Museum of Natural History and Science Bulletin 17, Dinosaurs of New Mexico.



Dr Timothy J. Williams

USDA/ARS Researcher
Agronomy Hall
Iowa State University
Ames IA 50014

Phone: 515 294 9233
Fax:   515 294 3163

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