Stegosaur remains from the Middle Jurassic of West Siberia
Stegosaur remains from the Middle Jurassic of West Siberia
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西西伯利亚中侏罗世的剑龙遗骸
DOI：
10.31610/trudyzin/2009.313.2.153
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
S. Krasnolutskii
中科院分区：
文献类型：
--
作者：
A. O. Averianov;S. Krasnolutskii
克拉斯诺亚尔斯克边疆区别列佐夫斯克采石场中侏罗世（奥陶统）Itat组产出了大量剑龙化石。在不同的微脊椎动物遗址发现了许多孤立的牙齿，在剑龙采石场挖掘出了相关的骨骼遗骸，主要是椎骨，肋骨和髂骶块碎片。这些遗骸可能属于一个分类群，其特征是在颊齿系的一个冠侧上有许多次级脊，在联合骶骨中有六个椎骨，四个骶骨和一个背骶肋骨，在前尾的横突上缺乏背突，在前尾的神经棘的适度扩张的顶部，以及大的三角形横向薄背真皮板。这些特征和其他特征的结合并不是任何其他已知剑龙分类单元的特征，而别列佐夫斯克剑龙可能代表了一个新的分类单元。在已知的剑龙中，它与北美洲和亚洲晚侏罗世和早白垩世的剑龙最相似，因为牙齿上有许多次级脊，髋臼上缘与髂骨髂前突之间和背侧真皮板结构中的直角。它与剑龙的区别在于神经棘的顶端近似不扩张，以及在前尾椎的横突上缺乏背突。别列佐夫斯克剑龙是化石记录中最古老的剑龙之一。
The Middle Jurassic (Bathonian) Itat Formation at Berezovsk Quarry, Krasnoyarsk Territory (West Siberia, Russia) has produced abundant remains of stegosaurs. Numerous isolated teeth are found at various microvertebrate sites, and associated skeletal remains, mostly vertebrae, ribs, and ilio-sacral block fragments were excavated at the Stegosaur Quarry. These remains likely belong to one taxon which is characterized by numerous secondary ridges on one crown side in cheek dentition, six vertebrae in the synsacrum, four sacral and one dorsosacral ribs, lack of dorsal process on the transverse process in anterior caudals, moderately expanded tops of the neural spines in anterior caudals, and large triangular transversely thin dorsal dermal plates. The combination of these and other features is not characteristic for any other known stegosaur taxon and the Berezovsk stegosaur likely represents a new taxon. Among known stegosaurs it is most similar with Stegosaurus from the Late Jurassic and Early Cretaceous of North America and Asia by having numerous secondary ridges on teeth, a right angle between the supraacetabular flange and the anterior iliac process of ilium and in the structure of the dorsal dermal plates. It differs from Stegosaurus by plesiomorphically unexpanded tops of the neural spines and lack of dorsal process on the transverse processes in the anterior caudal vertebrae. The Berezovsk stegosaur is among the oldest stegosaurs in the fossil record.