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Enantiornithine bird coracoid from Upper Cretaceous of Utah



From: Ben Creisler
bcreisler@gmail.com

A new online paper:


Andrew A. Farke & Priyanka P. Patel (2012)
An enantiornithine bird from the Campanian Kaiparowits Formation of Utah, USA
Cretaceous Research (advance online publication)
http://dx.doi.org/10.1016/j.cretres.2012.04.002
http://www.sciencedirect.com/science/article/pii/S0195667112000754

An isolated coracoid represents the first described occurrence of an
enantiornithine bird from the Kaiparowits Formation (Upper Cretaceous)
of southern Utah, USA. The specimen is identified as enantiornithine
by the convex scapular facet, approximate alignment of this facet with
the humeral articular facet and acrocoracoid process, and the presence
of an acrocoracoidal tubercle. This coracoid came from a comparatively
large individual, consistent with previous reports of other large
enantiornithines from strata of Campanian strata in North America,
South America, and Europe. The occurrence of enantiornithines in the
Kaiparowits Formation and their apparent absence in the well-sampled
Dinosaur Park Formation of similar age in Alberta represents yet
another faunal difference between the two areas, although this may be
a result of environmental differences rather than the endemism
proposed for non-avian dinosaurs.