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哈卢西基尼亚的形像爪子和塔克托波达的情况

Martin R Smith¹, Javier Ortega-Hernández¹

¹Department of Earth Sciences, Downing Site, University of Cambridge, Cambridge CB2 3EQ, UK.

|August 19, 2014

概括

这项研究揭示了坎布里亚半球动物Hallucigenia sparsa的爪子与现存的Onychophora (天虫) 的下巴和爪子是同类的. 这一发现解决了幻觉类的lobopodians作为早期的onichophorans,澄清了泛人类类的进化.

科学领域:

古生物学的古生物学
进化生物学进化生物学
发展生物学发展生物学

背景情况:

洛博波迪亚 (Lobopodia) 是古老时代的一群多样化的"脚虫",由于缺乏衍生性质,在泛类动物中具有不清楚的遗传学位置.
了解 lobopodian 关系对于重建 Onychophora,Tardigrada 和 Euarthropoda 的进化历史至关重要.

研究的目的:

为了研究在Panarthropoda中的lobopodians的进化关系.
为了澄清幻觉基因 lobopodians 的遗传位置,特别是 Hallucigenia sparsa.
为了提供关于泛人类足的古生物学证据.

主要方法:

对Hallucigenia sparsa.的末端爪子进行了详细的形态分析.
爪子结构与现存Onychophora的下巴和爪子进行比较.
结合泛类人头部细分的发育数据的克拉迪斯分析.

主要成果:

哈卢西基尼亚斯帕萨 (Hallucigenia sparsa) 具有由构成元素堆构成的末端爪子,与现存的Onychophora相同.
克拉迪斯蒂克分析将幻觉基因 lobopodians 作为干群 onychophorans 解决.
塔尔迪格拉达和欧亚类动物之间的姐妹群关系得到了古生物学数据的支持.

结论:

这项研究阐明了导致泛人类类类的进化转变.
龙类动物表现出祖先的泛人类形态,为我们了解早期动物进化提供了信息.
古生物学证据支持塔尔迪格拉达和欧阿特罗波达的结合.

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