一个化石的腹腔节揭示了与坎布里亚时代的状虫有着 chaetognath 的亲和力
Jakob Vinther1,2, Luke A Parry3, Mirinae Lee4
1School of Earth Sciences, Palaeobiology Research Group, University of Bristol, Bristol BS8 1TQ, UK.
Science advances
|July 23, 2025
概括
来自格陵兰的新化石Nektognathus evasmithae揭示了神秘的nectocaridids是早期的箭虫 (chaetognaths). 这一发现澄清了它们的进化位置,并突出了它们在坎布里亚食物网中的掠夺性作用.
科学领域:
- 古生物学的古生物学
- 进化生物学 进化生物学
- 坎布里亚化石 坎布里亚化石
背景情况:
- 尼克托卡里迪类动物是古老时代神秘的动物,其遗传位置不确定.
- 以前的假设表明它与各种类属有关,包括带状动物,软体动物和泛类动物.
研究的目的:
- 为了描述一个新的nectocaridid物种,Nektognathus evasmithae,从坎布里亚早期的Sirius Passet Lagerstätte.
- 为了澄清在动物王国内nectocaridids的遗传位置.
主要方法:
- 关于Nektognathus evasmithae. 的化石标本的描述
- 与现存和化石chaetognaths和其他坎布里亚动物群进行比较解剖分析.
- 基于共享的解剖特征的遗传学分析.
主要成果:
- 尼克托格纳图斯 (Nektognathus evasmithae) 呈现出一个腹部结节,这是柴托格纳图斯的特征.
- 与阿米斯克类动物 (Timorebestia和Amiskwia) 共有的特征包括下器,侧,下端门和大天线.
- 这些发现将nectocaridids置于chaetognath干系中.
结论:
- 尼克托卡里迪斯被证实是干系组的chaetognaths,解决了他们的有争议的遗传学地位.
- 尼克托卡里迪的复杂感官解剖学表明它们具有掠夺性的生活方式,并且在坎布里亚热带结构中扮演着重要的角色.
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