Echiuroidea

例句：

1. 1. The Echiuroidea is a group of marine animals that feed on small crustaceans.
   海螺目是一群海洋动物，它们以小型甲壳类动物为食。
2. 2.The Echiuroidea includes species such as the sea snail and the starfish.
   海螺目包括如海蜗牛和海星等物种。
3. 3.The Echiuroidea is an important component of the ocean ecosystem.
   海螺目是海洋生态系统的重要组成部分。