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首页> 外文期刊>Journal of Systematic Palaeontology >A Ceratopsian dinosaur psittacosaurus sibiricus from the Early Cretaceous of West Siberia, Russia and its phylogenetic relationships
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A Ceratopsian dinosaur psittacosaurus sibiricus from the Early Cretaceous of West Siberia, Russia and its phylogenetic relationships

机译：俄罗斯西西伯利亚早白垩世的角龙属恐龙psittacosaurus sibiricus及其系统发生关系

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摘要

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 as exits for cranial nerves Ⅹ+Ⅺ, Ⅻ_(1+2) and Ⅻ_3, in contrast with previous interpretations. Cranial nerve Ⅸ exits the brain cavity through the metotic fissure. Most Psittacosaurus localities are confined to lacustrine deposits and this animal undoubtedly inhabited areas around the great lakes widely distributed in Central Asia during the Early Cretaceous. The age of the Psittacosaurus biochron is estimated as Hauterivian-Albian.
机译：西西伯利亚克麦罗沃省谢斯塔科沃的Aptian-Albian Ilek地层的Psittacosaurus sibiricus，有两个几乎完整的成年骨骼，几组相关的骨骼以及从孵化后到成年动物的众多孤立骨骼。 Psittacosaurus sibiricus与其他9个种的独特之处在于32种诊断特征的组合，其中6种是该种的亚型：颞下窗小，前颌前短，眶后内侧短，法律上的丘脑深裂，延伸到颈角的后侧，与突出的块茎和23个s骨成一定角度。剑龙（Psittacosaurus sibiricus）是中华假单胞菌的姊妹物种，与之共享显着的金字塔形侧面突出的法人角，但比后者更易得，具有更发达的睑板和眶后角。与先前的解释相反，枕外/骨科的三个外侧孔被解释为颅神经nerve +Ⅺ，Ⅻ_（1 + 2）和Ⅻ_3的出口。颅神经Ⅸ通过裂口离开脑腔。大部分的鹦鹉嘴龙类地区都局限于湖泊沉积物，这种动物无疑是在白垩纪早期广泛分布在中亚的大湖周围的栖息地。蛇颈龙生物时代的年龄估计为上特维安-阿尔比安。

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