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首页> 外文期刊>Geodiversitas >Systematic reinterpretation of Piksi barbarulna Varricchio, 2002 from the Two Medicine Formation (Upper Cretaceous) of Western USA (Montana) as a pterosaur rather than a bird
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Systematic reinterpretation of Piksi barbarulna Varricchio, 2002 from the Two Medicine Formation (Upper Cretaceous) of Western USA (Montana) as a pterosaur rather than a bird

机译：从美国西部（蒙大拿州）的白垩纪两种药物组（翼龙而不是鸟类）对Piksi barbarulna Varricchio，2002的系统性重新解释

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Varricchio (2002) described some forelimb bones from the Late Cretaceous (Campanian) Two Medicine Formation, Glacier County, Montana (USA), as the holotype of Piksi barbarulna, a supposed ornithothoracine bird. However reevaluation of Piksi Varricchio, 2002 instead recognizes this genus as belonging to Pterosauria Kaup, 1834 and not Aves Linnaeus, 1758. Piksi exhibits the following derived humeral traits of pterosaurs: 1) very large ectepicondyle; 2) large trochlea; 3) with a deep, wide and poorly deliminated brachial depression that is proximodistally extended; 4) a wide and deep olecranal fossa not marked dorsally by a ridge; and 5) lacking a distal depression of the groove for the m.??humerotricipitalis. Moreover, the putative Early Cretaceous birds Eurolimnornis Jurcs??k & Kessler, 1986 and Palaeocursornis Jurcs??k & Kessler, 1986, based on distal humeri, are also regarded as pterosaurs. The record of Piksi constitutes an important addition to the Latest Cretaceous pterosaurian record.
机译：Varricchio（2002）将蒙大拿州冰川县晚白垩世（坎帕克）二药组的一些前肢骨骼描述为所谓的鸟硫鸟碱鸟的原型，即Piksi barbarulna。但是，对2002年对皮克斯·瓦里基奥的重新评估却认为该属属于翼龙翼龙属，1834年，而不属于Aves Linnaeus，1758年。 ）非常大的外胚层; 2）大滑车; 3）具有近端延伸的较深，较宽且脱水不良的肱骨凹陷; 4）宽而深的鹰嘴窝，背侧没有脊;和5）肱骨肱三头肌缺乏凹槽的远端凹陷。而且，假定的早白垩世鸟类 Eurolimnornis Jurcs ?? k＆Kessler，1986 和 Palaeocursornis Jurcs ?? k＆Kessler，1986，基于肱骨远端，也被认为是翼龙。 Piksi 的记录构成了最新白垩纪翼龙记录的重要补充。

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