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首页> 美国卫生研究院文献>other >The real Bigfoot: a pes from Wyoming USA is the largest sauropod pes ever reported and the northern-most occurrence of brachiosaurids in the Upper Jurassic Morrison Formation
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The real Bigfoot: a pes from Wyoming USA is the largest sauropod pes ever reported and the northern-most occurrence of brachiosaurids in the Upper Jurassic Morrison Formation

机译：真正的大脚怪：来自美国怀俄明州的pes是有报道以来最大的蜥脚类pes也是上侏罗纪莫里森组中腕龙的最北端

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摘要

A set of associated left pedal elements of a sauropod dinosaur from the Upper Jurassic Morrison Formation in Weston County, Wyoming, is described here. Several camarasaurids, a nearly complete small brachiosaur, and a small diplodocid have been found at this locality, but none match the exceptionally large size of the pedal elements. Next to the associated pedal elements, an isolated astragalus, phalanx and ungual were found, which match the large metatarsals in size. The elements cannot be ascribed to diplodocids due to the lack of a ventral process of metatarsal I. Moreover, the morphology of metatarsal V has a broad proximal end, with a long and narrow distal shaft, which differs from Camarasaurus. The size of the material and a medially beveled distal articular surface of metatarsal IV imply an identification as a brachiosaurid. This is the largest pes ever reported from a sauropod dinosaur and represents the first confirmed pedal brachiosaur elements from the Late Jurassic of North America. Furthermore, this brachiosaur material (the pes and the small nearly complete specimen) is the northernmost occurrence of brachiosaurids in the Morrison Formation.
机译：这里描述了怀俄明州威斯顿县上侏罗纪莫里森组的蜥脚类恐龙的一组相关的左脚踏板元素。在该地区发现了几只蜥蜴龙，几乎完整的小腕龙和小双齿龙，但没有一个能与踏板元件的超大尺寸相匹配。在相关的踏板元件旁边，发现了一个孤立的黄芪，趾骨和小腿，与大小的meta骨相匹配。由于缺乏I骨I的腹突，这些元素不能归于双齿类动物。此外，meta骨V的形态具有较宽的近端，远端轴又长又窄，这与Camarasaurus不同。材料的大小和of骨IV的内侧斜面远端关节表面暗示着已鉴定为腕龙。这是蜥脚类恐龙有史以来最大的猿猴，代表了北美晚期侏罗纪最早确认的脚腕腕动物元素。此外，这种腕龙属物质（pes和几乎完整的小的标本）是莫里森组中腕龙的最北端。

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