Two new species of the Canthocamptus mirabilis group (Copepoda: Harpacticoida: Canthocamptidae) from South Korea

Two new harpacticoid species belonging to Canthocamptus Mirabilis species group, C. odaeensis and C. incurvisetosus, are described from South Korea, with an evaluation of the variability of several characters. Both species are assumed to be closely related in sharing the apomorphic characters of the triangular hyaline membrane on the anal operculum and the male-type caudal ramus in females. The occurrence of the C. mirabilis group in South Korea is also briefly commented. Canthocamptus incurvisetosus is most widely distributed and frequently occurs in mountain waters of South Korea, while C. odaeensis is a geographically isolated species. They co-occurred at only one location, where the reproductive isolation of these species is reinforced by character displacements, especially of the female caudal ramus and the ornamentation of the leg 5 exopod.