一个异常的茎四足动物来自巴西的早期珀米亚纪
Jason D Pardo1, Claudia A Marsicano2,3, Roger Smith4,5
1Negaunee Integrative Research Center, Field Museum of Natural History, Chicago, IL60605, USA.
Proceedings. Biological sciences
|March 5, 2026
概括
一个新的古老的干四足动物,Tanyka amnicola,来自早期的波斯纪巴西,挑战了以前关于四足动物进化的想法. 它的生存和独特的下巴表明冈德瓦纳的多样性和利基探索比以前理解的要大.
科学领域:
- 古生物学的古生物学
- 脊椎动物的进化 脊椎动物的进化
- 贡德瓦纳生物地理学
背景情况:
- 四足动物的进化往往被分为早期的多样化和碳化雨林崩 (CRC) 后的两动物和羊动物的后期替代.
- 这个模型对刚德瓦纳早期四足动物的适用性仍然不清楚.
- 古老的干四足动物面临着重要的周转事件,特别是在CRC之后.
研究的目的:
- 描述一个来自巴西早期波斯河时期的新古老的干四足动物,Tanyka amnicola.
- 调查这个新分类的遗传学关系和古生态影响.
- 重新评估关于刚德瓦纳在早期珀米亚纪期间四足动物周转率的假设.
主要方法:
- 化石遗骸的描述,重点是独特的下形态 (下骨骨扭曲,冠状牙,角质表面).
- 遗传学分析以确定Tanyka amnicola在四足动物干系中的位置.
- 与来自劳鲁西亚和冈德瓦纳的其他早期四足动物群体进行比较.
主要成果:
- 发现和描述Tanyka amnicola,gen. et sp. 的发现和描述. nov.,一个古老的茎四足动物,来自巴西早期的波斯河.
- 遗传学定位表明与更接近四足冠群的四足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足足.
- 坦尼卡·阿姆尼科拉 (Tanyka amnicola) 是第二个已知的干四足动物群体,尽管在劳鲁西亚灭绝,但在刚德瓦纳存活到晚期的早期珀米亚时期.
结论:
- 在冈德瓦纳的Tanyka amnicola的生存表明,石灰岩四足动物周转假设可能过于简单.
- 独特的下形态表明了处理小型无脊椎动物或植物材料的潜在适应.
- 古代干四足动物继续多样化,并在冈德瓦纳占据新的生态利基,并进入了波斯河.
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