Cestoidea

例句：

1. 1. The cestodes are the larvae of tapeworms.
   绦虫的幼虫是扁形动物。
2. 2. Cestodes is a genus of flatworms.
   扁形动物是一类扁平的蠕虫。
3. 3. The cestodes have been found in many different environments.
   扁形动物在许多不同的环境中被发现。