Abstract
Irepacma was established by Moriuti, Saito & Lewvanich in 1985, with Irepacma pakiensis Moriuti, Saito & Lewvanich, 1985 as the type species. It shared the two-segmented labial palpus in male with the closely related genera Periacma Meyrick, 1894, Ripeacma Moriuti, Saito & Lewvanich, 1985 and Epiracma Wang, 2005. The typical character to distinguish Irepacma from its allies is the absence of the apophyses anteriores in the female genitalia. In the male genitalia it is closer to Periacma Meyrick, but can be distinguished mostly by the absence of the dorso-proximal process of the valva, or by having a dorso-proximal process that often far exceeds half the length of the valva.
References
Meyrick, E. (1894) On a collection of Lepidoptera from Upper Burma. Transactions of the Entomological Society of London 1894, 1–29.
Moriuti, S., Saito, T. & Lewvanich, A. (1985) Thai species of Periacma Meyrick and its allied two new genera (Lepidoptera: Oecophoridae). Bulletin of the University of Osaka Prefecture (B) 37, 19–50.
Moriuti, S., Saito, T. & Lewvanich, A. (1989) Thai species of the Oecophorine genera Periacma, Irepacma and Ripeacma (Lepidoptera: Oecophoridae). Microlepidoptera of Thailand 2, 113–152.
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Wang, S.X. & Li, H.H. (2005) A new oecophorid genus and species (Lepidoptera: Oecophoridae) from China. Entomological News 116(3), 167–172.