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Re: Kosmoceratops not present in Dinosaur Park Formation of Canada
Interesting paper on Chasmosaurus systematics.
Btw, does anyone know if PLoS ONE normally releases updated
PDFs, or is this the final version of the paper..? I ask because
none of the single-column figures are formatted [yet] as
single column--they're all just tossed in as full page width,
which makes for lengthier printing (you can tell that some
were intended as single column because "planned for column
width" hasn't been removed from the end of the caption).
Formatting those single column figs. can complicate page
layout, but I think it's worth it even in a paper you'll only
be viewing on-screen.
(and apologies for yahoo's mangling of the original post
On Mon, 1/4/16, Ben Creisler <email@example.com> wrote:
Subject: Kosmoceratops not present in Dinosaur Park Formation of Canada
Date: Monday, January 4, 2016, 1:07 PM
Ben Creisler firstname.lastname@example.org
New in PLoS ONE:
James A. Campbell, Michael J. Ryan, Robert B. Holmes & Claudia J.
A Re-Evaluation of the Chasmosaurine Ceratopsid Genus
(Dinosauria: Ornithischia) from the Upper Cretaceous
Dinosaur Park Formation of Western Canada.
PLoS ONE 11(1): e0145805.
The chasmosaurine ceratopsid Chasmosaurus is known from the
Cretaceous (Campanian) Dinosaur Park Formation of southern
Saskatchewan. Two valid species, Chasmosaurus belli and C.
have been diagnosed by differences in cranial ornamentation.
validity has been supported, in part, by the reported
segregation of chasmosaurines in the Dinosaur Park
Formation, with C.
belli and C. russelli occurring in discrete, successive
An analysis of every potentially taxonomically informative
chasmosaurine specimen from the Dinosaur Park Formation
C. belli and C. russelli have indistinguishable ontogenetic
and overlapping stratigraphic intervals. Neither taxon
autapomorphies, nor a unique set of apomorphies, but they
separated and diagnosed by a single phylogenetically
character—the embayment angle formed by the posterior
relative to the parietal midline. Although relatively deeply
specimens (C. russelli) generally have relatively longer
horncores than specimens with more shallow embayments (C.
neither this horncore character nor epiparietal morphology
can be used
to consistently distinguish every specimen of C. belli from
Status of Kosmoceratops in the Dinosaur Park Formation
Kosmoceratops is purportedly represented in the Dinosaur
Formation by a specimen previously referred to Chasmosaurus.
reassignment of this specimen to Kosmoceratops is
unsupported here, as
it is based on features that are either influenced by
within the realm of individual variation for Chasmosaurus.
we conclude that Kosmoceratops is not present in the
Formation, but is instead restricted to southern Laramidia,