海胆纲动物

例句：

1. 1. The sea cucumber is a type of invertebrate that belongs to the class Chordata.
   海参是一种属于脊索动物门的无脊椎动物。
2. 2. In marine biology, the classification of animals is based on their evolutionary history and anatomy.
   在海洋生物学中，动物的分类是基于它们的进化历史和解剖学。
3. 3. The diversity of marine life is a testament to the complexity of the ocean ecosystem.
   海洋生物多样性是海洋生态系统复杂性的证明。