Palaeocaridacea

例句：

1. 1.The discovery of this fossil species has shed light on the evolution of life in the Palaeocaridacea.
   这一化石物种的发现为古生动物亚纲中生命的进化提供了线索。
2. 2.Palaeocaridacea fossils are often found in ancient rocks, providing insights into the early Earth's ecosystems.
   古生动物亚纲的化石通常在古老的岩石中发现，这为我们提供了关于早期地球生态系统的见解。
3. 3. Palaeocaridacea is a diverse group of organisms that have existed for over 500 million years.
   古生动物亚纲是一个存在了超过5亿年的多样性生物群。