【摘要】 <正> 小拟哲水蚤Paracalanus parvus(Claus)是胶州湾浮游桡足类中的优势种之一,也是我国沿岸海域桡足类中的优势种。它广泛分布于世界暖温带海区的近岸与河口。 这种桡足类虽然个体较小,但数量大,对于以浮游生物为饵料的鱼类来说,有着不可低估的重要性。更多还原

【Abstract】 Paracalanus parvus (Clans) is one of the dominant species of the Pelagic copepods found in liaozhou Bay. This paper presents the results of studies made on copepodid stage morphology of it, a detailed morphological description as well as figures of its five copepodid stages are given. The sex of this species begin to differentiate when it reaches stage IE. Peroioped I of the copepodid of each stage has no apical spine from which itcan be distinguished from its allied species--Paracalanus crassirostris Dahl as well asfrom adult.The material for study was collected in 1982. The length of the individual in winter-spring is larger than that in summer-autumn. It is worthy of note that no matter in what season the sample was collected, the length of copepodid I-Y is constantly 1.3 times that of the metasome.更多还原