一个来自南澳大利亚的爱迪亚卡双边生物,具有生态动物的亲和力
Ian V Hughes1, Scott D Evans2, Mary L Droser3
1Organismic and Evolutionary Biology, Harvard University, Cambridge, MA 02138, USA.
Current biology : CB
|November 19, 2024
概括
一个新的化石,Uncus dzaugisi,为Ecdysozoa提供了第一个明确的Ediacaran身体化石证据. 这一发现使化石记录与分子钟数据相协调,证实了这个主要动物群体的前坎布里亚起源.
科学领域:
- 古生物学的古生物学
- 进化生物学 进化生物学
- 埃迪亚卡兰生物群
背景情况:
- 分子时钟和坎布里亚化石表明,许多动物类的新新生态起源.
- 绝对的前坎布里亚时代Ecdysozoan尸体化石不存在,在化石记录中造成了一个空白.
- 痕迹化石表明,主要的生态动物分裂发生在坎布里亚纪之前.
研究的目的:
- 描述一个新的化石生物从埃迪亚卡尔时期.
- 为了提供第一个明确的身体化石证据,在前坎布里亚时代为Ecdysozoa提供.
- 为了使化石记录与动物进化的分子数据相协调.
主要方法:
- 关于 Uncus dzaugisi gen. et. 的描述 这是SP.SP. 基于它的形态学,来自南澳大利亚的埃迪亚卡拉成员.
- 对生态关系和相关的痕迹化石进行分析,以推断运动性.
- 身体形态和推断运动与已知的Ecdysozoan特征进行比较,特别是Nematoida.
主要成果:
- Uncus dzaugisi被描述为一个光滑的,形生物体,前后分化和独特的浮雕表明一个刚硬的皮层.
- 证据表明Uncus是运动的,身体形状和运动与Nematoida一致.
- 这一发现提供了强有力的证据,证明了Ecdysozoan的亲和力.
结论:
- 乌努克斯·扎乌吉西 (Uncus dzaugisi) 代表了第一个自信的前坎布里亚时期的尸体化石被分配到Ecdysozoa.
- 这一发现证实了Ecdysozoa的前剑桥起源.
- 这些发现弥合了预测的进化模式和埃迪亚卡拉化石记录之间的差距.
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