Jeong Hyun Gi, Kotov Alexey A, Lee Wongchoel
Department of Life Science, Hanyang University, Seoul 133-791, Republic of Korea.
Zootaxa. 2013;3666:31-40. doi: 10.11646/zootaxa.3666.1.3.
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.
韩国济州岛发现了贝氏盘肠溞属（枝角亚目：端足目：盘肠溞科）的一个新物种。济州盘肠溞（Pleuroxus jejuensis sp. nov.）是南半球类钩状物种的近亲，而非狭义的钩状盘肠溞（P. aduncus s. str.）。它与1878年斯图德描述的维氏盘肠溞（P. wittsteini）具有以下共同特征：（1）棕色；（2）瓣膜后腹部分无小齿；（3）孔后距离异常短；（4）肛门后齿成组。济州盘肠溞与维氏盘肠溞的区别在于：（1）孔后距离更小；（2）瓣膜后缘内侧有亚边缘刚毛；（3）腹节后背角突出；（4）每组只有两个肛门后齿；（5）腹节爪最近端的基部刺更长；（6）第一对附肢上的副刚毛非常短。类维氏盘肠溞似乎是一个古老的泛大陆物种群的残余。
