【摘要】 本文描述汤氏长足水蚤的6个无节幼虫期和5个桡足幼体期的主要形态特征,并绘制各期幼体图版。这种长足水蚤无节幼虫的身体后端左右对称,第二触角的基节和底节不具咀嚼刺,大?的咀嚼突起很不发达。无节幼虫期在发育过程中不摄取食物。桡足幼体期的第四对胸足第一基节内缘不具刚毛,第五对胸足单肢型。两性外部形态的分化在第Ⅳ期桡足幼体出现。此外,还比较研究了汤氏长足水蚤和真刺唇角水蚤的幼体外部形态特征。更多还原

【Abstract】 Calanopia thompsoni A.Scott is a common species of the coastal waters of China.It passes through,typical six nauplius and six copcpodid stages,the last being the adult.The caudal part is symmetrical in the six nauplius stages.There arc no masticatory hooks on the coxopodal and basipodal segments of the antennae of the six nauplius stages.The masticatory processes of the mandibles of the later nauplius stages are very weak.It appears that C.thompsoni passes through its nauplius stages without feeding,being dependent on its large supply of yolk.There are no satae on the inner margin of the coxopodal segment of fourth pair of swimming feet of the copepodid stages.The fifth pair of swimming feet of the copepodid stages are uniramous.Sexual dimorphism first becomes apparent in the fourth copepodid stage.The nauplius stages of C.thompsoni are similar to those of Labidocera euchaeta Giesbrecht in the shape of body and the symmetry of caudal part.更多还原