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BackgroundMarine benthic harpacticoid copepods are poorly known in Korea due to the difficulty in obtaining specimens. Currently, the genus    Stylicletodes    Lang, 1936, which is known to occur in subtidal sediments, has not been reported in this area so far. During surveys on the subtidal meiofauna, we found a new species of    Stylicletodes    from several subtidal muddy sediments in the Yellow Sea and South Sea.New informationIn this study, we describe both sexes of a new species of    Stylicletodes    collected from the Yellow Sea and South Sea of Korea.    Stylicletodes   trifidus    sp. nov. differs from its congeners in the following characteristics: the trifid rostrum, relative length ratio of the endopods to exopods on legs 1–4, reduced armature formulae on legs 3–4, constricted shape at mid-length of the anal somite, and structure of the sexually dimorphic male leg 3 with a two-segmented endopod. The new species underwent loss of the maxilliped, which is very rare in harpacticoids and is probably an important clue for the phylogeny of the species of    Stylicletodes   .

A new species of the genus Stylicletodes Lang, 1936 ( Copepoda , Harpacticoida , Cletodidae ) from South Korea