Uyeno Daisuke, Nagasawa Kazuya
Graduate School of Biosphere Science, Hiroshima University, 1-4-4 Kagamiyama, Higashi-Hiroshima, Hiroshima, Japan.
Syst Parasitol. 2009 Nov;74(3):225-37. doi: 10.1007/s11230-009-9208-4. Epub 2009 Sep 30.
Three new species of the copepod genus Hatschekia Poche, 1902, H. lima n. sp., H. cylindrus n. sp. and H. sunaoi n. sp., are described from the gill filaments of a triggerfish, Abalistes filamentosus Matsuura & Yoshino, caught off the Ryukyu Islands, Okinawa, Japan. These new species share an unusual morphological character, i.e. four stout posterior spines on the intercoxal sclerites of legs 1 and 2. H. lima n. sp. differs from its congeners in having a robust inner lobe on the maxillule and leg 3 with a swollen basal lobe. H. cylindrus n. sp. is distinguishable from its congeners by having a cephalothorax fused to the trunk and a double-semicircular chitinous frame. H. sunaoi n. sp. is characterised by leg 3 with a swollen basal lobe and an oval cephalothorax.
本文描述了哲水蚤属（Hatschekia Poche，1902）的三个新物种，即利马哲水蚤（H. lima n. sp.）、圆柱形哲水蚤（H. cylindrus n. sp.）和须尾哲水蚤（H. sunaoi n. sp.），它们采自日本冲绳琉球群岛海域捕获的横纹多纪鲀（Abalistes filamentosus Matsuura & Yoshino）的鳃丝。这些新物种具有一个不寻常的形态特征，即第一和第二对胸足的基节间骨片上有四根粗壮的后棘。利马哲水蚤与同属其他物种的区别在于，其小颚内叶粗壮，第三对胸足基部叶肿胀。圆柱形哲水蚤与同属其他物种的区别在于，其头胸部与躯干部愈合，有一个双半圆形几丁质框架。须尾哲水蚤的特征是第三对胸足基部叶肿胀，头胸部呈椭圆形。
