Three new species of <Emphasis Type="Italic">Hatschekia</Emphasis> Poche, 1902 (Copepoda: Siphonostomatoida: Hatschekiidae) parasitic on <Emphasis Type="Italic">Abalistes filamentosus</Emphasis> (Pisces: Tetraodontiformes: Balistidae) from off Okinawa,Japan |
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Authors: | Daisuke Uyeno Kazuya Nagasawa |
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Institution: | (1) Graduate School of Biosphere Science, Hiroshima University, 1-4-4 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8528, Japan; |
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Abstract: | 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. |
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