Hyporheic zone, a blind spot: Discovery of the larva of Kisaura (Trichoptera: Philopotamidae) from Japan.

Four genera of Philopotamidae (Trichoptera) are known from Japan: Chimara, Dolophilodes, Kisaura, and Wormaldia. Among them, adults of the genus Kisaura are known in the Oriental and East Palearctic region; but until now, larvae of this genus have not been observed. In this study, molecular evidence is presented to support the relationship between adults and larvae of Kisaura minakawai Arefina 2005 from hyporheic zones of Japanese rivers. Morphological features of the larva of K. minakawai, which include very small eyes and somewhat dorsoventrally flattened (depressed) head capsules, compared with those of other philopotamid species, are also suggested to be adapted to the hyporheic zone. Detailed morphology of K. minakawai larval characters are provided.