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Juvenile Pinacosaurus (Ankylosauria) postcrania from Mongolia
A new paper:
Michael E. Burns, Tatiana A. Tumanova and Philip J. Currie (2015)
Postcrania of juvenile Pinacosaurus grangeri (Ornithischia:
Ankylosauria) from the Upper Cretaceous Alagteeg Formation, Alag Teeg,
Mongolia: implications for ontogenetic allometry in ankylosaurs.
Journal of Paleontology 89(1): 168-182
The ankylosaurine Pinacosaurus is one of the best known ankylosaur to
date in terms of the number and preservational quality of specimens.
Juvenile to sub-adult postcrania collected by the Soviet-Mongolian
Paleontological Expedition from the Upper Cretaceous Alagteeg
Formation at Alag Teeg, Mongolia can be assigned to Pinacosaurus
grangeri based on discrete cranial characters. One individual is
significantly larger than the others and demonstrates delayed fusion
of postcranial elements with the earliest occurring between dorsal
ribs and vertebrae. The robustness of forelimb elements is positively
allometric with respect to their length, indicating weight-bearing
relationship. Such length-dependent correlations are not seen in the
hind limbs. Finally, incipient cervical half rings suggest a
developmental pathway of outgrowths from the underlying band combined
with fusion of overlying osteoderms.