Abstract
Irepacma was established by Moriuti, Saito & Lewvanich in 1985, with,Jrepacmapakiensis 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. To date, 18 Irepacma species have been described, distributed mostly in the Oriental and Palaearctic regions. Among the known species, four were described from Thailand (Moriuti et al. 1989), one from Burma in Periacma but transferred to the present genus (Moriuti et al. 1989), and 15 were recorded in China (Wang 2006).
NSTL