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A survey on the harpacticoid copepods from an intertidal zone in Hyeopjae sandy beach, Jeju Island, Korea, resulted in the discovery of an unusual laophontid,    Jejulaophonte   hyeopjaeensis    sp. n. , which cannot be placed in any extant genus within the family. To accommodate the species, a new genus of the family   Laophontidae   T. Scott, 1905 is proposed and fully described here. The new species is closely related to the lineage of the five primitive genera,    Carraroenia    McCormack, 2006,    Coullia    Hamond, 1973,    Hemilaophonte    Jakubisiak 1933,    Psammoplatypus    Lee &amp; Huys, 1999, and    Robustunguis    Fiers, 1992 (the CCHPR-lineage) by the reduced P2 endopod, ovate shape of the female P5 exopod and sexual dimorphism in the P3 endopod. However, it displays discrepancies from the species of the CCHPR-lineage in the presence of an inner seta on P3 and P4 exp-2, four setae on P4 enp-2, and an inner seta on P3 and P4 enp-2 in the female. Furthermore, no other species within the family   Laophontidae   has three setae on P2 exp-3 and a seta on P2 enp-2 at the same time. The new species has sexual dimorphism in the antennule, genital segmentation and the legs from P2 to P5. The terminal seta on the second endopodal segment of P2 in the male is longer than that in the female. The endopod of P3 is 3-segmented and displays a short inner apophysis on the second segment in the male. The outer setae on the exopod of P3 and P4 are distinctly thicker and stronger in the male than in the female. Mitochondrial cytochrome oxidase subunit I (mtCOI) sequencing of the new species has been realized in order to be used in future phylogenetic analysis.

A new genus ( Copepoda , Harpacticoida , Laophontidae ) from Jeju Island of Korea