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Re: PACHYRHINOSAUR LINEAGE
> Are _Einiosaurus_ and _Achelousaurus_ the two new centrosaurines
> regarded as intermediate between _Styracosaurus_ and
"Marine transgressions and the evolution of Cretaceous dinosaurs"
Horner, Varrichio, & Goodwin
Nature 358 (July, 1992) pp. 59-61
"Two new horned dinosaurs from the Upper Cretaceous Two medicine
Formation of Montana; with a phylogenetic analysis of the
Centrosaurinae (Ornithischia: Ceratopsidae)"
Journal of Vertebrate Paleontology
15(4), December 1995 pp. 743-760
The first article makes more or less that claim. Sampson's article
is a little more conservative and simply suggests very close ties between
I'm working on enties on _Acelousaurus_ and _Einiosaurus_ for the
DinoPages web site right now, but it probably wont get done till the end
of the month as I have other things I need to get done in a hurry. For
these two genera, I have the above references, the Natural History
(July, 1995) article by Sampson, and a paper on the _Einiosaurus_ bone beds
by R. Rogers (Palios, 1990). Does anyone else have additional references?
Also, in the Nature paper, _Einiosaurus_ and _Achelousaurus_, not yet
named, were referred to as "transitional taxa B & C". What is
"transitional taxa A"? It has a _Styracosaurus_ like skull, but only two
parietal spikes, like _Achelousaurus_ and _Einiosaurus_.