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Ornithomimid hind limb bones from Upper Cretaceous of Kazakhstan



Ben Creisler
bcreisler@gmail.com


A new paper:


Alexander O. Averianov, Hans-Dieter Sues, Gareth Dyke & Bolat Bayshashov (2016)
Hind limb bones of an ornithomimid dinosaur from the Upper Cretaceous
Bostobe Formation, northeastern Aral Sea region, Kazakhstan.
Palaeoworld (advance online publication)
doi:10.1016/j.palwor.2016.01.003
http://www.sciencedirect.com/science/article/pii/S1871174X16000056



Parts of the hind limbs of what appears to be a single individual of a
theropod dinosaur from the Upper Cretaceous (Santonian–?Campanian)
Bostobe Formation of the northeastern Aral Sea region, Kazakhstan, are
identified as belonging to an indeterminate ornithomimid based on
combination of derived and primitive traits including one
ornithomimosaurian synapomorphy (medial side of the anterior surface
of the distal end of metatarsal III expanded). This is the first
discovery of the associated theropod material from the Bostobe
Formation. Ornithomimids were known previously from this formation
only from isolated bones. Based on the reduction of the flexor fossa
and flexor tubercle on the pedal ungual this material can be referred
to the derived ornithomimid clade that includes Sinornithomimus,
Gallimimus, Qiupalong, Struthiomimus, and Ornithomimus. The partial
femur has a dorsomedially directed head similar to that of an
unidentified ornithomimid from the correlative Yalovach Formation of
Tajikistan and may belong to the same or a closely related taxon.