Achlya longipennis is a moth in the family Drepanidae. It was described by Hiroshi Inoue in 1972. It is found in Japan (Honshu,, 1972, Bulletin of the Japan Entomological Academy 6 (2): 29; figs. 2, 7-9. Hokkaido) and the Russian Far East. The habitat consists of various types of mixed and broad-leaved forests.A review of the Thyatirin-moths (Lepidoptera, Drepanidae: Thyatirinae) of the Russian Far East
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