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A new carcharodontosaurian theropod (Dinosauria: Saurischia) from the Lower Cretaceous of Thailand

机译:来自泰国下白垩统的一种新的食肉动物蜥脚类兽脚亚目(Dinosauria:Saurischia)

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摘要

The isolated fossil remains of an allosauroid theropod from the Lower Cretaceous Khok Kruat Formation of Khorat, Thailand, are described in this study. Detailed observations support the establishment of a new allosauroid, Siamraptor suwati gen. et sp. nov. This new taxon is based on a composite cranial and postcranial skeleton comprising premaxilla, maxilla, jugal, surangular, prearticular, articular, vertebrae, manual ungual, ischium, tibia, and pedal phalanx. It is distinguished from other allosauroids by characters such as a jugal with straight ventral margin and dorsoventrally deep anterior process below the orbit, a surangular with a deep oval concavity at the posterior end of the lateral shelf and four posterior surangular foramina, a long and narrow groove along the suture between the surangular and the prearticular, an articular with a foramen at the notch of the suture with the prearticular, an anterior cervical vertebra with a pneumatic foramen (so-called ‘pleurocoel’) excavating parapophysis, and cervical and posterior dorsal vertebrae penetrated by a pair of small foramina bilaterally at the base of the neural spine. The presence of a huge number of camerae and pneumatopores in cranial and axial elements reveals a remarkable skeletal pneumatic system in this new taxon. Moreover, the phylogenetic analyses revealed that Siamraptor is a basal taxon of Carcharodontosauria, involving a new sight of the paleobiogeographical context of this group. Siamraptor is the best preserved carcharodontosaurian theropod in Southeast Asia, and it sheds new light on the early evolutionary history of Carcharodontosauria.
机译:这项研究描述了从泰国霍拉特的下白垩统科克·克鲁特组分离出的化石类兽脚类兽脚的化石残骸。详细的观察结果支持建立新的异龙,Siamraptor suwati gen。等。十一月这种新的分类单元基于颅骨和颅后复合骨骼,包括前颌骨,上颌骨,颌骨,上颌骨,关节前,关节,椎骨,人工颌,坐骨,胫骨和脚趾骨。它与其他同种类别动物的特征不同,例如具有直腹缘的眶骨和眼眶下方的前腹深前突,在侧架的后端有一个深椭圆形凹面的三角形,在后方有四个后孔,狭长而狭窄沿缝合线位于上颌骨与前关节之间的凹槽,在缝线的凹口处有一个带前孔的关节腔,一个带有气孔的前颈椎椎骨(所谓的“胸膜腔”),可挖出骨po,而颈背和后背脊椎两侧的一对小孔穿透椎骨。颅骨和轴向元件中存在大量照相孔和肺孔,这揭示了这种新的分类单元中非凡的骨骼气动系统。此外,系统发育分析还表明,Siamraptor是Carcharodontosauria的基础分类单元,对这一群体的古生物地理环境有了新的认识。暹罗捕食者是东南亚保存最完好的兽脚目兽脚类兽脚亚目,它为食人龙的早期进化史提供了新的思路。

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