Abstract
Prostigmatid aquatic mites are known to temporarily live on the surface of aquatic insects in their life cycle. We collected imaginal aquatic insects by hand-sweeping and a light trap on mountain streams in Shizuoka and Kanagawa prefectures in Japan to clarify the parasitic nature of aquatic mites on them. During the survey, 16 genera in 13 families of Trichoptera, four genera in two families of Plecoptera, and three genera in two families of Diptera were recorded as host insects of aquatic mite genera Protzia, Partnunia, Stygomomonia, and Lebertia in Hydrachnidiae and Stygothrombium in Stygothrombiae. Trichoptera was newly recorded as a host taxon of aquatic mites in Japan. The diversity of host insect taxa for Protzia was greater than that for the other four mite genera. The host-parasite correspondence between mite and host insect taxa was generally consistent with the results so far obtained.
