The diversity of Triassic South American sphenodontians: a new basal form, clevosaurs, and a revision of rhynchocephalian phylogeny
The diversity of Triassic South American sphenodontians: a new basal form, clevosaurs, and a revision of rhynchocephalian phylogeny
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DOI：
10.1080/14772019.2021.1976292
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发表时间：
2021-09-20
影响因子：
2.6
通讯作者：
Rayfield, Emily J.
中科院分区：
文献类型：
--
作者：
Chambi-Trowell, Sofia A. V.;Martinelli, Agustin G.;Rayfield, Emily J.
rhynchocepharians是一群类似蜥蜴的底裂类爬行动物，在中生代非常多样化，但现在仅限于新西兰现存的一个属。最近的枝系分析揭示了两个主要的枝系，尤显dontia和更靠后的新显dontia，但由于缺少数据和未修订的数据矩阵，个体分类群的关系仍然难以确定。在这里，我们通过重新评估，评估和添加新的特征和操作分类单位，彻底修改了已建立的舌头亚目的数据矩阵，不同于以往的分析，我们的目标是考虑所有已知的舌头亚目。此外，我们描述了一个来自巴西南部诺里亚的早期拟表型分类群的新属和新种，具有独特的多形和非形特征的马赛克，我们用mu CT成像重新检查了拟表型巴西Clevosaurus brasiliensis的颅齿解剖结构，揭示了喙头类动物中一种独特的齿突形式。
Rhynchocephalians are a group of lizard-like diapsid reptiles that were very diverse during the Mesozoic but are now restricted to a single extant genus in New Zealand. Recent cladistic analyses have revealed two major clades, Eusphenodontia and the more crownward Neosphenodontia, but relationships of individual taxa have remained difficult to determine because of missing data and an unrevised data matrix. Here we drastically revise the established data matrix on rhynchocephalians by reassessing, evaluating, and adding new characters and operational taxonomic units, differing from any previous analyses in our goal to consider all known rhynchocephalians. In addition, we describe a new genus and species of an early eusphenodontian taxon from the Norian of southern Brazil, with a unique mosaic of plesiomorphic and apomorphic traits, and we re-examine the craniodental anatomy of the eusphenodontian Clevosaurus brasiliensis with mu CT imaging, revealing a unique form of acrodonty amongst rhynchocephalians.