A Morphological Study of Adults and Immature Stages of 20 Japanese Species of the Family Chironomidae (Diptera)

摘要

This study was undertaken as part of the Special NIES Research Program 'Studies on Eutrophication of Land Water' and constitutes the fifth report on taxonomy and biology of Japanese chironomid midges compiled by the author and his colaborators. In the preceding papers by Sasa (1978a, b), accounts were given on the taxonomic status and descriptions of adults and immature stages of a very common and important species, Tokunagayusurika akamusi (Tokunaga), and on the comparative morphology of nine species of the genus Chironomus in Japan. In the present paper, description on 19 species of larvae and 20 species of pupae and adults which were frequently found in the study areas, are reported. The association between larvae and pupae as well as pupae and adults were based mostly on specimens individually reared in the laboratory.