Revised description of Simulium (Nevermannia) sasai, a rare and poorly known species in Japan (Diptera: Simuliidae)

Abstract

Simulium (Nevermannia) sasai (Rubtsov), a rare and poorly known black-fly species in Japan, is taxonomically revised: its female, male and pupa are fully described, and the mature larva is described for the first time on the basis of samples collected in Kanagawa Prefecture, Honshu, Japan. The morphological characters of S. (N.) sasai are compared to those of its related species within the feuerborni species-group to which this species is assigned.