Trichosia (Trichosia) lengersdorfi Heller, Köhler & Menzel, 2016 Material examined. JAPAN • 1 ♂; Honshu, Hyogo Pref., Yabu, Mt. Hyounosen, mixed forest dominated by Fagus crenata and bamboo grasses; 35°21'N, 134°31'E; alt. 1200 m; 28 Sept. 1995; M. Jaschhof and T. Yagi leg., sweep-net; SDEI. Remarks. This species is known from Europe and China (Heller et al. 2016), and is recorded here from Japan for the first time. This species resembles T. caudata, but is distinguished from it by the condition of macrotrichia on wing membrane and the characters of the male gonostylus (see key to the Japanese species). A male of T. lengersdorfi and a male of T. caudata were collected sympatrically in this study.

Published as part of Sutou, Mitsuaki & Menzel, Frank, 2025, The genera Mouffetina Frey and Trichosia Winnertz (Diptera, Sciaridae) in Japan with a key for the Japanese species and an updated world checklist, pp. 167-182 in Contributions to Entomology 75 (1) on pages 167-182, DOI: 10.3897/contrib.entomol.75.e145605