New material of a non-averostran neotheropod dinosaur from the Lower Jurassic Lufeng Formation of Yunnan, south-western China

IF 3 2区 生物学 Q1 ZOOLOGY
Hongqing Li, Xu Xing, Juan Jiang, Jianrong Liu, Stephen L Brusatte, Shundong Bi
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引用次数: 0

Abstract

Neotheropoda is the core clade of predatory dinosaurs that originated in the Triassic and became highly diversified and globally distributed by the Early Jurassic. Currently, six species of Neotheropoda have been described from Early Jurassic localities in Yunnan Province, south-western China. Here we describe a new specimen from the Lufeng Formation in central Yunnan, representing a non-coelophysoid, non-averostran neotheropod. Osteohistological analysis indicates the immaturity of the specimen. Computed tomography scans reveal the internal morphology of trunk vertebrae, implying a more developed postcranial skeletal pneumaticity in averostran-line neotheropods than previously thought. Phylogenetic analysis finds the new specimen as the closest sister-taxon to Averostra (Ceratosauria + Tetanurae). It does not form a unique subclade with the previously described Lufeng Formation taxa Shuangbaisaurus anlongbaoensis and Sinosaurus triassicus. Instead, Sh. anlongbaoensis and Si. triassicus are found as sister-taxa, indicating that the former may be a subjective junior synonym of the latter. Although the new specimen has a unique combination of character states, and a potential autapomorphy, we conservatively refrain from establishing a new taxon, due to its immature status and the lack of information on postcranial anatomy in other Yunnan theropods. Regardless, this specimen bridges a morphological gap between non-averostran and averostran theropods.
云南下侏罗统陆峰组非鹿角兽新足类恐龙的新材料
新蜥脚类是掠食性恐龙的核心分支,起源于三叠纪,到早侏罗世已高度多样化并在全球分布。目前,在中国西南部云南省早侏罗世地区已发现了6种新蜥脚类动物。本文描述了云南中部陆丰组的一个新标本,它代表了一种非腔骨类、非海鸟类的新足类动物。骨组织分析显示标本不成熟。计算机断层扫描显示了躯干椎骨的内部形态,这意味着阿佛罗安系新足类动物比以前认为的更发达的颅后骨骼充气。系统发育分析发现,新标本是与角鼻龙(角鼻龙+破伤风科)最近的姊妹分类群。它与先前描述的陆丰组类群双百龙和三叠纪中华龙并不是一个独特的亚支。取而代之的是,安龙保鱼和Si。Triassicus被发现为姊妹分类群,表明前者可能是后者的主观初级同义词。尽管新标本具有独特的性状组合和潜在的自同源性,但由于其发育不成熟,且缺乏其他云南兽脚亚目恐龙的颅后解剖资料,我们保守地避免建立一个新的分类群。无论如何,这一标本填补了非角驼兽兽脚亚目和角驼兽脚亚目兽脚亚目之间的形态差距。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
6.50
自引率
10.70%
发文量
116
审稿时长
6-12 weeks
期刊介绍: The Zoological Journal of the Linnean Society publishes papers on systematic and evolutionary zoology and comparative, functional and other studies where relevant to these areas. Studies of extinct as well as living animals are included. Reviews are also published; these may be invited by the Editorial Board, but uninvited reviews may also be considered. The Zoological Journal also has a wide circulation amongst zoologists and although narrowly specialized papers are not excluded, potential authors should bear that readership in mind.
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