Rymosia placida Winnertz, 1863 (Diptera: Mycetophilidae), infesting in Trichoderma cornudamae

Abstract

We report that Rymosia placida Winnertz, 1863 (Diptera: Myceotphilidae) infests fruit bodies of Ascomycota, Trichoderma cornudamae (Hypocreales: Hypocreaceae). A Japanese name of this fungus gnat species was proposed after its species epithet. This is the first report of animal infestation on Trichoderma cornudamae which is one of the toxic fungi in Japan and of host fungi of R. placida. This fungus gnat was recorded from Honshu in addition to Hokkaido. Trichoderma cornudamae broadly occurs in Japanese forests infected by Japanese oak wilt. We expect that the host-parasite association between T. corunudamae and R. placida is generally observed in Hokkaido and Honshu.