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首页> 外文期刊>The anatomical record: advances in integrative anatomy and evolutionary biology >Redescription of the Cranium of Jingshanosaurus xinwaensis Jingshanosaurus xinwaensis (Dinosauria: Sauropodomorpha) from the Lower Jurassic Lufeng Formation of Yunnan Province, China
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Redescription of the Cranium of Jingshanosaurus xinwaensis Jingshanosaurus xinwaensis (Dinosauria: Sauropodomorpha) from the Lower Jurassic Lufeng Formation of Yunnan Province, China

机译：云南省下侏罗悦庐峰组的云南陆丰龙（Dinosauria：Sauropodomorpha）jingshanosaurus Xinwaensis jingshanosaurus Xinwaensis的重新设计

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ABSTRACT The Lower Jurassic Lufeng Formation in Yunnan Province of southwestern China has yielded an important and diverse terrestrial vertebrate fauna dominated by basal sauropodomorph dinosaurs. Nevertheless, many of them lack detailed descriptions and/or explicit diagnoses, hampering systematic analyses of their interrelationships and further studies. We present a detailed redescription of the cranial osteology of Jingshanosaurus xinwaensis and amend its diagnosis. Incorporation of the revised anatomical data into a phylogenetic analysis finds Jingshanosaurus to be one of the earliest diverging sauropodiforms. Moreover, the previously reported Chuxiongosaurus lufengensis is considered to be a junior synonym of J. xinwaensis. Jingshanosaurus can be diagnosed by a unique combination of character states, including (1) an inflection at the base of the dorsal premaxillary process; (2) the level of the caudal margin of the external naris being caudal to the mid‐length of the maxillary tooth row and the rostral margin of the antorbital fenestra; (3) a ventrally constricted subtriangular orbit; (4) the height‐to‐length ratio of the dentary being greater than 0.2; and (5) a distally recurved long axis of the premaxillary and rostral maxillary tooth crowns. As the largest taxon (around 9 m long) currently known among Lufeng basal sauropodomorphs and one of the best known basal‐most sauropodiforms, a better understanding of Jingshanosaurus will allow for reconstruction of the ecomorphotypic diversity of the Lower Jurassic Lufeng dinosaurs and help to decipher the origin and early evolution of sauropodiforms, the clade ultimately leading to the gigantic sauropods. Anat Rec, 303:759–771, 2020. ? 2019 Wiley Periodicals, Inc.
机译：摘要云南省云南省西南部的侏罗纪鲁丰形成，得到了一个重要而多样化的陆地脊椎动物动物群，由基底索波波尔弗恐龙占主导地位。然而，其中许多人缺乏详细的描述和/或显式诊断，阻碍了他们的相互关系和进一步研究的系统分析。我们展示了京滨龙群兴旺斯的颅骨骨质学并修改其诊断。将修订后的解剖数据纳入系统发育分析中发现JingShanosaurus是最早发散的Sauropodss之一。此外，先前报道的楚雄曲龙龙卢比斯被认为是J.Xinwaensis的初级同义词。景山可以通过独特的性格状态诊断诊断，包括（1）背部预毛过程的基础上的拐点; （2）外部NARIS的尾部缘水平是上颌齿排中间长度的尾部和抗坏血腺叶所的主余缘; （3）腹侧收缩的下曲线轨道; （4）伪造的高度与长度大于0.2; （5）前轴脂肪和鼻孔上颌齿冠的远端复发的长轴。作为最大的分类（大约9米长）目前在Lufeng Basal Sauropodomorphs中闻名，并更好地了解Jingshanosaurus的理解将允许重建下侏罗纪陆丰恐龙的生态型多样性，并有助于破译Sauropodiforms的起源和早期演变，思工最终导致巨大的撒鲁波峰。 ANAT REC，303：759-771,2020。 2019 Wiley期刊，Inc。

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