echinothuroid type

例句：

1. 1.The echinothuroid type is a rare species of sea snail.
   海胆型是一种罕见的海洋螺类。
2. 2. Echinothuroid type fossils are found in ancient rocks.
   海胆型化石发现于古代岩石中。
3. 3. The study of echinothuroid type organisms has important implications for marine ecology.
   研究海胆型生物对于海洋生态学具有重要意义。