Echinoidea

例句：

1. 1.The Echinoidea is a group of marine creatures that includes sea snakes and other echinoderms.
   海蛇亚目是一类海洋生物，包括海蛇和其他海生软体动物。
2. 2.The Echinoidea plays an important role in the ecosystem, as they are predators that help control populations of smaller fish.
   海蛇亚目在生态系统中起着重要作用，因为它们是捕食者，有助于控制较小鱼类的种群。
3. 3. In this study, we focused on the Echinoidea to investigate their feeding habits and behavior patterns.
   在本研究中，我们关注了海蛇亚目，以研究它们的觅食习惯和行为模式。