For example, Peter Sheldon' s studies of trilobites, a now extinct marine animal with a segmented body, offer a detailed glimpse into three million years of evolution in one marine environment.
例如，彼得·谢尔登对于三叶虫的研究，那是一种已灭绝的身体分节的海洋生物，他的研究让我们得以一窥三百万年以来一个海洋环境的进化过程。
Any mainly aquatic arthropod usually having a segmented body and chitinous exoskeleton.
主要为水生的节肢动物，通常身体分节并有壳质的外骨骼。
Any of various aquatic crustaceans of the subclass Branchiopoda, such as the fairy shrimp and water flea, characterized by a segmented body and flattened, leaflike thoracic appendages.
鳃足动物一种鳃足亚纲水生甲壳类动物，如神仙虾和水蚤，特征是身体分节，具有平直叶状。
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