A Ceratopsian dinosaur Psittacosaurus sibiricus from the Early Cretaceous of West Siberia, Russia and its phylogenetic relationships

Published on Jan 1, 2006in Journal of Systematic Palaeontology2.315
· DOI :10.1017/S1477201906001933
Alexander O. Averianov25
Estimated H-index: 25
(RAS: Russian Academy of Sciences),
Alexei V. Voronkevich3
Estimated H-index: 3
(Tomsk State University)
+ 1 AuthorsAlexei V. Fayngertz1
Estimated H-index: 1
(Tomsk State University)
Synopsis Psittacosaurus sibiricus from the Aptian‐Albian Ilek Formation at Shestakovo, Kemerovo Province, West Siberia, is represented by two almost complete adult skeletons, several associated groups of bones and numerous isolated bones of individuals ranging from post‐hatchling to fully grown animals. Psittacosaurus sibiricus differs from nine other species of the genus by a unique combination of 32 diagnostic characters, six of which are autapomorphies of the species: small in‐fratemporal fenestra, anteroposteriorly short premaxilla, short medial process of postorbital, deep cleft for qaudratojugal on jugal, extending to the posterior side of jugal horn, angular with prominent tuber and 23 presacrals. Psittacosaurus sibiricus is the sister species of P. sinensis, with which it shares the prominent pyramidal laterally projecting jugal horn, but more derived than the latter in having more developed palpebral and postorbital horns. The three lateral foramina on the exoc‐cipital/opisthotic are interpreted ...
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