THE BRAINCASE OF ARIZONASAURUS BABBITTI—FURTHER EVIDENCE FOR THE NON-MONOPHYLY OF ‘RAUISUCHIAN’ ARCHOSAURS
THE BRAINCASE OF ARIZONASAURUS BABBITTI—FURTHER EVIDENCE FOR THE NON-MONOPHYLY OF ‘RAUISUCHIAN’ ARCHOSAURS
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亚利桑那龙巴比蒂的脑壳——“劳苏奇亚”古龙非单一性的进一步证据
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
S. Nesbitt
中科院分区：
文献类型：
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作者：
D. Gower;S. Nesbitt
摘要本文描述了产于美国西部中三叠世的劳依苏克类伪鳄类祖龙亚利桑那龙（Arizonasaurus babbitti）的两个标本。无明显的脑细胞自型，具有A.巴氏鳄类是伪鳄类/crurotarsans类的类形动物。系统发育分析结果表明，A.巴氏鳄与其他已知脑组织解剖学的劳氏鳄类（Batrachotomus kupferzellensis，Saurosuchus galilei，Postosuchus kirkpatricki，Tikisuchus romeri）没有特别密切的关系。鉴于A.巴比提是一个分支的成员，包括波波龙和查特吉，排除了大多数其他劳伊氏鳄，脑标本数据表明劳伊氏鳄不是单系的。这与最近对非脑壳数据的评估一致，但相比之下，我们的分析表明，Poposaurus及其最亲密的盟友与Crocodylomorpha的关系比其他rauisuchians更远。
Abstract The braincase of the rauisuchian pseudosuchian archosaur Arizonasaurus babbitti, from the Middle Triassic of the western United States, is described from two specimens. There are no obvious braincase autapomorphies and most of the other braincase features of A. babbitti are plesiomorphic for pseudosuchians/crurotarsans. The results of phylogenetic analyses of archosaurian braincase characters indicate that A. babbitti is not especially closely related to other rauisuchians for which braincase anatomy is known (Batrachotomus kupferzellensis, Saurosuchus galilei, Postosuchus kirkpatricki, Tikisuchus romeri). Given that A. babbitti is a member of a clade that includes Poposaurus and chatterjeeids to the exclusion of most other rauisuchians, braincase data suggest that Rauisuchia are not monophyletic. This is in accordance with a recent appraisal of non-braincase data but, in contrast, our analyses suggest that Poposaurus and its closest allies are more distantly related to Crocodylomorpha than are other rauisuchians.