Acanthophractida

例句：

1. 1.The arachnids are fascinating creatures that can be found in the rainforests.
   蜘蛛类动物是令人着迷的生物，可以在雨林中找到。
2. 2.Acanthopterygians are a group of fish that live in freshwater environments.
   棘鱼属于鱼类，生活在淡水环境中。
3. 3.Acanthocephalans are a type of crustacean that lives in saltwater.
   蟹蛛是一种生活在盐水中的甲壳类动物。