The male genitalia of Chrysopolomidae were found to include by nine pairs of muscles: m1, m2(10), m3(2), m4, m5(7), m6(5), m7(6), m8(3), m20, and the unpaired muscle m21, fully corresponding to their ground plan in Zygaenoidea. The archaic muscles m20 were found in both Chrysopolomidae and Limacodidae, for the first time for the superfamily Zygaenoidea. Muscles m3(2) and m4 in all the studied chrysopolomids are attached to the base of a gnathos-like complex sclerite, which proves its origin from the transtilla. The genital apparatus of Chrysopolomidae and its muscles are completely symmetrical. The bases of intravalval muscles m5(7) have moved from the sacculus to the juxta; this feature is not found in any other related family of the limacoid complex. The gnathos of Chrysopolomidae is reduced and functionally replaced by the transtilla separated from the valvae; some parts of the true gnathos may be incorporated in the gnathos-like structure of the transilla. A characteristic feature is the presence of strong muscles m3(2), which are reduced in all the studied limacodids. These muscles are running from the modified transtilla deep inside the uncus and provide not the abduction of the valvae but the depression of the uncus and the lifting of the arms of the transtilla. Thus, Chrysopolomidae are morphologically separated from Limacodidae; it is suggested that the former group should be treated as a separate family closely related to Limacodidae. The tribe Achroceridini is transferred from Chrysopolominae into Ectropinae based on the similar structure of the male genitalia and the presence of two pairs of spurs on the hind tibia.