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Large caenagnathids (Oviraptorosauria) from uppermost Cretaceous of Canada

Ben Creisler

A new paper:

Phil R. Bell, Philip J. Currie & Dale A. Russell (2015) [2014]
Large caenagnathids (Dinosauria, Oviraptorosauria) from the uppermost
Cretaceous of western Canada.
Cretaceous Research 52(A): 101–107
DOI: 10.1016/j.cretres.2014.09.006


Caenagnathid theropods are reported from the Maastrichtian of
Saskatchewan, Canada.
Isolated claws are among the largest known, resembling Anzu from the Dakotas.
Additional large unguals are reported from the Dinosaur Park Formation, Alberta.
Their large size may suggest referral to Chirostenotes.
Perceived caenagnathid distribution did not decrease in the latest Cretaceous.


Large caenagnathid unguals are described from the Dinosaur Park (upper
Campanian) and Frenchman (Maastrichtian) formations of Alberta and
Saskatchewan, respectively. The latter constitutes the first formal
description of Caenagnathidae from the Frenchman Formation. The
Saskatchewan material is also notable for its large size, comparable
to Anzu wyliei from the coeval Hell Creek Formation, placing them
among the largest caenagnathids from North America. The slightly
smaller Dinosaur Park unguals may pertain to either Caenagnathus
collinsi (a taxon for which manual material is only tentatively known)
or to an as yet unidentified large taxon. The new material
demonstrates that despite an apparent reduction in diversity in the
Maastrichtian, North American caenagnathid distribution did not
retract notably from its Campanian maximum.