【摘要】 通过对海蜇(Rhopilema esculentum)胚胎发育和足囊萌发进行连续观察,发现海蜇四触手螅状体存在2种形成方式:第一种方式为海蜇受精卵在水温(26±1)℃条件下经6 h发育到浮浪幼虫期,浮浪幼虫25 h后经过杯状体阶段,变态发育成四触手螅状体,进入附着生活阶段;第二种方式为足囊在适宜条件下萌发,首先形成杯状体,继而发育成四触手螅状体,且接近螅状体母体的足囊萌发率较高。本文观察发现的四触手螅状体形成的两种方式中,均出现杯状体的新阶段,进一步完善了海蜇的生活史过程。更多还原

【Abstract】 By continuous observation of embryonic development and podocyst propagation of Jellyfish,Rhopilema esculentum,two generation modes of scyphistoma were discovered.Mode Ⅰ,fertilized egg turned to scyphostima,which process took about 6 h from fertilized egg to planulae,and then nearly 25 h from planulae,scyphostoma to stationary scyphistoma with four tentacles at the temperature of 26±1℃;Mode Ⅱ,podocyst generated to scyphostima.The ratio of generation became higher with podocyst closed to scyphistoma.In this stage,podocyst first turned into scyphostoma,and then became scyphistoma with four tentacles.In this study,a new structure called scyphostoma was both found in the two scyphistoma generation modes.This discover improved the life cycle of jellyfish.更多还原