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首页> 外文期刊>Journal of Systematic Palaeontology >Revision of the sauropod dinosaurs of the Lower Cretaceous Trinity Group,southern USA, with the description of a new genus
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Revision of the sauropod dinosaurs of the Lower Cretaceous Trinity Group,southern USA, with the description of a new genus

机译：美国南部下白垩统三位一体群的蜥脚类恐龙修订版，并附有新属

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Early Cretaceous sauropods were among the first dinosaurs discovered in North America, but several aspects of their taxonomy and evolution remain poorly understood. Much of this ambiguity stems from lack of anatomical overlap among taxa and the 125-year-long taxonomic confusion surrounding the sauropods Astrodon and Pleurocoelus. New discoveries have begun to remedy the first problem, but a lack of autapomorphies in their holotypes and skeletal associations among their hypodigms renders Astrodon johnstoni, Pleurocoelus altus and Pleurocoelus nanus nomina dubia. Herein I examine the affinities of sauropods from the Trinity Group of Texas and Oklahoma previously referred to as 'Pleurocoelus' or 'Astrodon'. Some of this material currently comprises the genera Paluxysaurus and Sauroposeidon from laterally equivalent strata in Texas and Oklahoma, respectively. Although representative individuals of Paluxysaurus are only two-thirds the size of Sauroposeidon, bone histology of Paluxysaurus indicates that the individuals from the type locality were not near adult size. The similar provenance, lack of morphological differences, and shared unique features support referral of Paluxysaurus to Sauroposeidon. Other sauropod remains from the Trinity Group are not referable to 'Pleurocoelus', 'Astrodon' or Sauroposeidon. Some of these remains comprise the holotype of Astrophocaudia slaughteri gen. et sp. nov., a basal titanosauriform diagnosed by a hyposphene-hypantrum system in the caudal vertebrae. A sauropod hind limb previously referred to 'Pleurocoelus' is instead referable to Cedarosaurus weiskopfae based on shared features of the pes. Cladistic analysis indicates that Astrophocaudia and Sauroposeidon are members of Somphospondyli, whereas Cedarosaurus is a brachiosaurid. The Trinity Group of Texas and laterally equivalent Antlers Formation of Oklahoma exhibit similar dinosaur faunas at the generic and specific levels to the Cloverly Formation of Wyoming. This homogeneity with respect to latitude stands in marked contrast to the latitudinal variation in dinosaur communities that developed later in the Cretaceous.
机译：早白垩世的蜥脚类动物是北美最早发现的恐龙之一，但其分类学和进化的几个方面仍然知之甚少。这种歧义主要是由于类群之间缺乏解剖学上的重叠以及围绕蜥脚类动物Astrodon和侧耳腔的长达125年的分类学混乱。新发现已开始解决第一个问题，但由于缺乏全同型和亚同位体的骨骼关联，因此导致了Astrodon johnstoni，Pleurocoelus altus和Pleurocoelus nanus nomina dubia。在这里，我研究了得克萨斯州和俄克拉荷马州三位一体集团的蜥脚类恐龙的亲和力，以前将它们称为“侧耳腔”或“天体”。目前，这种材料中的一些包括得克萨斯州和俄克拉荷马州的侧向等价层中的Paluxysaurus和Sauroposeidon属。尽管霸王龙的代表性个体仅是蜥脚龙的三分之二，但霸王龙的骨组织学表明，来自该类型所在地的个体并不接近成年个体。相似的出处，缺乏形态学差异以及共有的独特功能支持将古龙科推荐给蜥脚龙。三位一体集团的其他蜥脚类动物残骸不被称为“侧耳”，“天文”或蜥脚龙。这些遗骸中的一些包括Astrophocaudia slaughteri gen的全型。等。 nov。，由尾椎的低蝶-垂体系统诊断出的基底钛甲龙。以前称为“侧耳腔”的蜥脚类动物的后肢基于大猩猩的共有特征而被称为雪松（Cedarosaurus weiskopfae）。克拉德分析表明，星状夜蛾和剑齿龙是剑突的成员，而雪龙是腕龙。得克萨斯三位一体群和俄克拉荷马州的横向等效鹿角组在怀俄明三叶草组的一般和特定水平上都表现出相似的恐龙动物。就纬度而言，这种同质性与后来在白垩纪发展的恐龙群落的纬度变化形成鲜明对比。

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