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首页> 外文期刊>Journal of Systematic Palaeontology >An articulated cervical series of Alamosaurus sanjuanensis Gilmore, 1922 (Dinosauria, Sauropoda) from Texas: new perspective on the relationships of North America's last giant sauropod
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An articulated cervical series of Alamosaurus sanjuanensis Gilmore, 1922 (Dinosauria, Sauropoda) from Texas: new perspective on the relationships of North America's last giant sauropod

机译：来自得克萨斯州的铰接式颈椎三级变种Alaosaurus sanjuanensis Gilmore，1922年（Sauropoda的恐龙，Sauropoda）：对北美最后一个大型蜥脚类恐龙关系的新观点

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The sauropod dinosaur Alamosaurus sanjuanensis Gilmore, 1922 has been known from Maastrichtian deposits of southwestern North America for nearly a century. Alamosaurus is the youngest sauropod taxon known in North America. Originally described from an isolated scapula and ischium from New Mexico, more of Alamosaurus was revealed by an incomplete skeleton from southern Utah. Additional referred specimens from western Texas provided the first few examples of cervical, dorsal and sacral vertebrae known for the taxon, but these came from relatively small and immature individuals. Here we describe an articulated series of cervical vertebrae of a large, mature titanosaur from Big Bend National Park, Texas, and provide evidence that the specimen can be referred to A. sanjuanensis. The specimen represents the first articulated cervical vertebral series described for the taxon, which clarifies aspects of cervical vertebral anatomy and provides at least one new diagnostic character for Alamosaurus. Many previous cladistic analyses found Alamosaurus to be a saltasaurid titanosaur, sometimes closely related to the Asian taxon Opisthocoelicaudia skarzynskii. We present cladistic analyses incorporating new data from this and other specimens from Big Bend National Park. The first places Alamosaurus as a lithostrotian titanosaur outside Saltasauridae. The second analysis, with greater focus on South American titanosaurs, finds Alamosaurus allied to Lognkosauria, a clade of South American titanosaurs notable for giant size and exceptionally robust necks. This relationship may be more congruent with the fossil record than hypotheses of phylogeny that would require saltasaurid titanosaurs to inhabit northern Laramidia, Beringia and Central Asia through the late Campanian and Maastrichtian while leaving no record of their presence.
机译：蜥脚类恐龙Alamosaurus sanjuanensis Gilmore，1922年在北美西南部的马斯特里赫特（Maastrichtian）矿藏中广为人知。拟龙是北美已知的最年轻的蜥脚类动物群。最初是由新墨西哥州的一个孤立的肩cap骨和坐骨描述的，而更多的阿拉莫龙是由犹他州南部的一个不完整的骨架揭示的。来自德克萨斯州西部的其他参考标本提供了以分类群而闻名的颈椎，背椎和椎的前几个例子，但这些样本来自相对较小且不成熟的个体。在这里，我们描述了得克萨斯州Big Bend国家公园的大型成熟钛龙的铰接式颈椎骨系列，并提供了标本可被称为A. sanjuanensis的证据。该标本代表了为分类单元描述的第一个铰接式颈椎系列，该系列阐明了颈椎解剖结构的各个方面，并为阿拉莫龙提供了至少一个新的诊断特征。以前的许多研究都发现，阿拉莫龙是一种食盐龙，它有时与亚洲分类群Opisthocoelicaudia skarzynskii密切相关。我们将结合大本德国家公园和其他标本中的新数据进行分类分析。首先，将拟龙作为Saltasauridae以外的立冲龙类的恐龙。第二种分析更着重于南美的泰坦龙，发现阿拉莫龙与Lognkosauria结盟，Lognkosauria是由南美巨龙组成的进化枝，以巨大的体型和异常坚固的脖子而著称。这种关系可能与化石记录相符，而不是系统发育假说，即系统要求系统将盐蓬龙恐龙通过后期的Campanian和Maastrichtian栖息在Laramidia北部，Beringia和中亚北部，而没有任何存在的记录。

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