title: A new species of the genus Pleuroxus Baird (Cladocera: Anomopoda: Chydoridae) from Jeju Island, South Korea.
abstract: A new species of the genus Pleuroxus Baird (Cladocera: Anomopoda: Chydoridae) is described from Jeju Island, South Korea. P. jejuensis sp. nov. is the closest relative of the aduncus-like species from southern hemisphere instead of P. aduncus s. str. It shares with P. wittsteini Studer, 1878 in: (1) brown colour; (2) absence of denticles on postero-ventral portion of valve; (3) unusually short postpore distance; (4) grouped postanal teeth. P. jejuensis sp. nov. differs from P. wittsteini in: (1) smaller postpore distance; (2) submarginal setules on inner side of the posterior valve margin; (3) prominent postero-dorsal angle of the postabdomen; (4) only two postanal teeth in each group; (5) longer proximalmost basal spine of the postabdominal claw; (6) very short accessory seta on limb I. The wittsteini-like chydorines seem to be remnants of an old, pan-continental species group.
authors.affiliation: Department of Life Science, Hanyang University, Seoul 133-791, Republic of Korea. sigagnes@hotmail.com
authors.forename: Hyun Gi
authors.initials: HG
authors.lastname: Jeong
authors.forename: Alexey A
authors.initials: AA
authors.lastname: Kotov
authors.forename: Wongchoel
authors.initials: W
authors.lastname: Lee
mesh_terms: D063147:Animal Distribution; D000825:Animal Structures / Q000033:anatomy & histology / Q000254:growth & development; D000818:Animals; D049628:Body Size; D033361:Cladocera / Q000033:anatomy & histology / Q000145:classification* / Q000254:growth & development; D005260:Female; D062312:Islands; D056910:Republic of Korea