he plankton and midwater trawl samples on which this paper is based were obtained during two cruises of R. V. Anton Bruun in 1963 and 1964, which, at that time, was participating in the Biological
The post-nauphar developmental stages of the Calanoid copepod Drepanopus forcipatus Giesbrecht are described. They are compared with copepodids of other members of the family Clausocalanidae. The sequence of appearance and development of segmentation and setation indicate considerable conformity and point to a uniform familial pattern. Attention is drawn to a general pattern of addition of body segments and of segments in the first antenna and swimming legs. Comparison of integumental pore patterns of several genera confirms the provisional pore signature of the family. Remarks are made on the identity and distribution of species of Drepanopus.
Morphological features, records of distribution and seasonal occurrence of the calanoid copepods Calanus sinicus Brodsky, 1965, and C. orientalis Jashnov, 1975, are compared. Differences between the specimens corroborate the validity of both species. Synonymies are presented. Calanus syunpuensis Kurasige, 1931, cannot be assigned with certainty to either species as senior synonym; it is proposed that this name be treated as a nomen dubium. The preoccupied name C. orientalis Jashnov is replaced with the new name Calanus jashnovi. The patterns formed by integumental organs, i.e. pores of integumental glands and sensilla, are compared between females of C. sinicus and C. orientalis and, further, between most species of Calanus s. str. These patterns support the division of the genus into the four groups established previously on the basis of other morphological characters. Within the pacificus group, C. sinicus and C. orientalis are set apart from the rest of the species by distinct common features of the urosomal pattern, but certain specific features separate the two species.
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