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Two Centrosaur Papers
First up is a study of the type skeleton of *Chasmosaurus irvinensis*, NMC
41357, and its unusual ossified morphology; then a paper describing a new
centrosaurine, *Albertasaurus nesmoi*, from the Oldman Formation of Albertsa,
previously described under a different name in M. Ryan's Ph.D. thesis.
Ryan, M. J. 2007. A new basal centrosaurine ceratopsid from the Oldman
Formation, southeastern Alberta. _Journal of Paleontology_ 81(2):376-396.
"A new centrosaurine ceratopsid, *Albertaceratops nesmoi*, is described from
the lower Oldman Formation (Upper Cretaceous) of southern Alberta, and is
based on a single, almost complete skull. Referred material is described
equivalent beds in the Judith River Formation of north-central Montana. A
limited phylogenetic analysis of the Ceratopsidae places the new taxon as
basal member of the Centrosaurinae and indicates that robust, elongate
postorbital horncores that form a synapomorphy of (Ceratopsidae +
*Zuniceratops*) are also present in Centrosaurinae."
This is the first dinosaur (non avian) taxon named in 2007, or at least it
Holmes, R. and C. Organ. 2007. An ossified tendon trellis in *Chasmosaurus*
(Ornithischia: Ceratopsidae). _Journal of Paleontology_ 81(2):411-414.
There is no abstract for the article, and there is no summary, but it's a
short paper, and is shorter if you've followed the earlier works by Organ on
ossified tendon morphology in dinosaurs.
Also in the same issue is a redescription of the ichthyosaur *Caypullisaurus*
by Marta Fernández, a description of a well-preserved skull of the aistopod
*Phlegethontia* by Jason Anderson.
Jaime A. Headden
"Innocent, unbiased observation is a myth." --- P.B. Medawar (1969)
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