New Records of the Copidognathus gibbus Group (Acari, Halacaridae) from Korea, with Descriptions of C. levicostatus n. sp. and C. vicinus

Two marine halacarids, Copidognathus levicostatus n. sp. and C. vicinus Bartsch, 1997, belonging to the gibbus group, have been recorded based on both sexes from microhabitat of intertidal sublittoral rocks coast South Korea. Is characterized by a combination features, as follows: absence areolae with rosette pores all dorsal ventral plates, presence short frontal process, pair costae raised narrow ribs posterior plate, partial fusion anterior epimeral plate genitoanal in sexes, three pairs perigenital setae male. The Korean specimens 1997 agree well original description Hong Kong, except for lateral claws bearing comb. This study provides detailed (re)descriptions morphological characteristics two halacarid species, vicinus, illustrations scanning electron microscope photomicrographs. Additionally, we present dichotomous key known species waters, accompanied brief comment their occurrence various microhabitats, especially habitat preferences geniculate non-geniculate red coralline algae.