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来自中国早三叠世中期的引鳄科主龙形类的解剖结构和系统发育位置。

The anatomy and phylogenetic position of the erythrosuchid archosauriform from the earliest Middle Triassic of China.

作者信息

Butler Richard J, Ezcurra Martín D, Liu Jun, Sookias Roland B, Sullivan Corwin

机构信息

School of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham, UK.

Sección Paleontología de Vertebrados, CONICET-Museo Argentino de Ciencias Naturales "Bernardino Rivadavia", Buenos Aires, Argentina.

出版信息

PeerJ. 2019 Feb 19;7:e6435. doi: 10.7717/peerj.6435. eCollection 2019.

DOI:10.7717/peerj.6435
PMID:30809443
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6385703/
Abstract

Erythrosuchidae is a clade of early archosauriform reptiles, which were apex predators in many late Early and Middle Triassic ecosystems, following the Permo-Triassic mass extinction. Erythrosuchids had a worldwide distribution, with well-preserved fossil material known from South Africa, European Russia, and China. We here redescribe the anatomy and revise the taxonomy of , which is one of the stratigraphically oldest erythrosuchids and is known from a single partial skeleton from the lowermost Middle Triassic (lower Anisian) lower Ermaying Formation of Shaanxi Province, China. We provide a new differential diagnosis for , and identify a series of autapomorphies relating to the morphologies of the skull roof and vertebrae. Incorporating updated anatomical information for into the most comprehensive morphological phylogenetic analysis available for early archosauromorphs recovers it as an early branching member of Erythrosuchidae, outside of the clade formed by , , , and , from the uppermost Lower Triassic to lower Middle Triassic Heshanggou Formation of China, is recovered as the earliest branching member of Erythrosuchidae.

摘要

引鳄科是早期主龙形类爬行动物的一个分支，在二叠纪-三叠纪大灭绝之后，它们是许多早三叠世晚期和中三叠世生态系统中的顶级掠食者。引鳄科分布于全球，在南非、俄罗斯欧洲部分和中国都有保存完好的化石材料。我们在此重新描述了其解剖结构并修订了 的分类， 是地层上最古老的引鳄科之一，已知的标本是来自中国陕西省中三叠世最下部（早安尼期）二马营组下部的一具不完整骨架。我们为 提供了新的鉴别诊断，并确定了一系列与颅顶和椎骨形态有关的自近裔性状。将更新后的 的解剖学信息纳入现有的针对早期主龙形类的最全面形态系统发育分析中，结果显示它是引鳄科的一个早期分支成员，在中国上三叠统至中三叠统下部和尚沟组的 、 、 和 所形成的分支之外， 被恢复为引鳄科最早的分支成员。

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