索罗德斯莫斯罗伯茨尼西利1891年 - - 苏格兰最古老的猎
Tomasz Szczygielski1, Marc Johan Van den Brandt2, Leandro Gaetano2,3
1Institute of Paleobiology, Polish Academy of Sciences, Warsaw, Poland.
PloS one
|May 29, 2024
概括
神秘的Saurodesmus robertsoni化石被重新归类为一种衍生品 cynodont,可能是一个tritylodontid. 这种苏格兰的三叠纪鸟挑战了先前的鉴定,并强调了重新检查历史标本的重要性.
科学领域:
- 古生物学的古生物学
- 脊椎动物古生物学 脊椎动物古生物学
- 凯诺纪哺乳动物进化
背景情况:
- 在1840年代初发现的Saurodesmus robertsoni全型是受损的样足骨,已被多次分配到不同的爬行动物和突触类群体.
- 这个标本几十年来一直是一个,它的分类学身份在很大程度上被遗忘了.
研究的目的:
- 为了重新描述和重新评估Saurodesmus robertsoni的全型.
- 确定Saurodesmus robertsoni在Cynodontia中的分类学位置,特别是探索其与Tritylodontidae的关系.
主要方法:
- 比较骨科:关于大腿骨形态的详细重新描述和分析.
- 遗传学括号:将关键的股骨特征与衍生的概率识别动物,哺乳动物和三龙类动物进行比较.
主要成果:
- 该标本被认定为股骨,而Saurodesmus robertsoni被认为是衍生类虫的有效分类,可能是三类虫.
- 索罗德斯罗伯索尼 (Saurodesmus robertsoni) 呈现出衍生自虫的特征,包括一个面向中间的小三角体和一个从轴中投射的股骨头偏移.
- 该标本与三龙类动物有显著的相似之处,特别是在大腿部扩张,三叉体发育和远端状体形态方面.
结论:
- 索罗德斯穆斯·罗伯茨尼 (Saurodesmus robertsoni) 是苏格兰发现的第一个三叠纪类动物.
- 这一发现表明,Saurodesmus robertsoni可能是最早的三龙类动物之一,也是全球最新的非哺乳动物类类动物之一.
- 这项研究强调了重新评估历史古生物学标本的必要性,特别是当新的比较数据变得可用时.
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