虾、蟹类属节肢动物门甲壳纲十足目,具有重要的经济价值。这里的幼体是指某些动物在形态上与成体不同的自由生活初期的发育阶段,如桡足类(水蚤)有无节幼体与桡足幼体即为一例。由于甲壳动物由较低等的鳃足亚纲(如蚤、丰年虫)向较高等的软甲亚纲(糠虾、虾、蟹)进化,其个体发育的幼体阶段往往由简单向复杂发展,造成了甲壳动物幼体发育的多样性。 Shrimp, crab is an arthropod door Crustacea ten feet, has important economic value. Here larval refers to the morphological and adult different from the initial stage of development of free life, such as copepods (Daphnia) nauplii and copepod larvae is an example. As the crustaceans evolve from the lower class Gillidae (eg, fleas and yew pests) to the higher subfamilies Mysis (shrimp, shrimp, crab), their larval stages of individual development tend to develop from simple to complex, Resulting in the diversity of juvenile crustacean development.