刺参(Stichopus japonicus)属于楯手目(Aspido- chirota)、刺参科(Stichopodidae)、刺参属(stichopus)。刺参有明显的变态生活史,由受精卵卵裂经囊胚期→原肠期→小耳状幼虫→中耳状幼虫→大耳状幼虫→樽形幼虫→五触手幼虫→稚参→幼参→成参(廖玉麟, 2001)。其中小耳状幼体、中耳状幼体、大耳状幼体统称为耳状幼体。耳状幼体是刺参整个生命周期中短暂而唯一的一个浮游生活阶段,幼体浮游一般需10天左右,之后变态为樽形幼体改为底栖生活,浮游时期幼体 Stichopus japonicus belongs to Aspido- chirota, Stichopodidae and stichopus. Stichopus has a significant abnormal life history, the fertilized egg cleavage blastocysts stage → → → intestinal primitive small ear-like ear larvae large ear larvae → → → Larvae Larvae → five tentacle Larvae → → → juvenile Senate → into a reference (Liao Yulin, 2001). Small auricles, middle ear-like larvae, large auricles collectively referred to as auricles. Eared larvae are the only short-lived, single-stage planktonic life stages of the sea cucumber. The larvae generally need about 10 days to float. After that, the metamorphosis changes from the larvae to benthos, and the larvae