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坎布里亚早期的Kylinxia zhangi和关节动物头部的演变

Robert J O'Flynn¹, Yu Liu², Xianguang Hou³

¹Yunnan Key Laboratory for Palaeobiology, Yunnan University, 650500 Kunming, China and School of Geography, Geology and the Environment, University of Leicester, University Road, Leicester, LE1 7RH, UK; Institute of Palaeontology, Yunnan University, 650500 Kunming, China; MEC International Joint Laboratory for Palaeobiology and Palaeoenvironment, Yunnan University, 650500 Kunming, China.

Current biology : CB

|August 29, 2023

概括

坎布里亚早期的关节动物Kylinxia zhangi显示了六段的头部,阐明了它在欧类动物进化中的关键作用. 这一发现重新塑造了我们对早期关节动物头部细分和进化的理解.

科学领域:

古生物学的古生物学
进化生物学进化生物学
节肢动物进化演化

背景情况:

基林西亚 (Kylinxia zhangi) 是一个早期的坎布里亚化石,对于理解关节动物进化至关重要.
它的形态桥梁"下"和"上"干群欧类人.
之前对Kylinxia的头部结构的解释需要改进.

研究的目的:

重新检查和澄清Kylinxia zhangi的头部结构使用微观影像.
为了完善Kylinxia在euarthropod干系中的家族遗传位置.
调查有关早期节肢动物头部进化的假设.

主要方法:

对新的Kylinxia标本进行微图扫描研究.
用新获取的形态学数据进行遗传学分析.

主要成果:

基林克西亚的头部有六个部分,包括前侧有三只眼睛的,双脑前部附属体和四对双眼附属体.
这与之前描述的五只眼睛和不同的附属物安排形成鲜明对比.
遗传学分析证实了Kylinxia的欧类干群位置,并表明在欧类冠群中早期演化出了一个六段的头部.

结论:

基林西亚的六段头部为关节动物头部细分的演变提供了关键的见解.
形态相似之处支持Kylinxia,放射性牙科动物和其他干群欧类动物之间的遗传学连续性.
基林西亚的特征完善了我们对从早期海洋关节动物过渡到皇冠群欧类动物的理解.

关键词:

前面的硬化炎是前面的硬化炎.计算机断层扫描 (CT) 是一种计算机断层扫描.欧类动物的头部眼睛的中部是眼睛的中部

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