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Oldest Polacanthus from England



From: Ben Creisler
bcreisler@gmail.com


A new online paper:


William T. Blows &  Kerri Honeysett  (2014)
First Valanginian Polacanthus foxii (Dinosauria, Ankylosauria) from
England, from the Lower Cretaceous of Bexhill, Sussex.
Proceedings of the Geologists' Association (advance online publication)
doi: http://dx.doi.org/10.1016/j.pgeola.2014.01.002
http://www.sciencedirect.com/science/article/pii/S0016787814000042

A new partial skeleton of the armoured ornithischian dinosaur
Polacanthus found in the Wadhurst Clay Formation (Valanginian stage)
of Bexhill, Sussex is the oldest recorded occurrence of this taxon.
Previous discoveries suggested that at least two armoured
ornithischians occur in the Wealden succession: Polacanthus, which was
mostly restricted to the Barremian, and Hylaeosaurus, which was
recorded as present only in the Valanginian. The new discovery extends
the stratigraphic range of Polacanthus into the Valanginian. Although
these two taxa appear to be closely similar anatomically, their
osteology now suggests they are not synonymous. The new specimen
includes the first known jugal as well as a comparatively rare
polacanthid plate/spine (splate) which probably comes from the
shoulder (pectoral) area of these animals.