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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Acknowledgements
We thank Associate Professor Tetsuo Yoshino, Professor Yuichi Hirose and Mr Takeshi Sasaki, University of the Ryukyus, for assistance and permission to use their laboratory facilities. We are grateful to Mr Sunao Yamashiro for help with fish collection. We would like to thank Professor Susumu Ohtsuka, Hiroshima University, for valuable suggestions made during the course of the study. Part of this work received financial support from the Ocean Exposition Commemorative Park Management Foundation, Okinawa.
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Uyeno, D., Nagasawa, K. Three new species of Hatschekia Poche, 1902 (Copepoda: Siphonostomatoida: Hatschekiidae) parasitic on Abalistes filamentosus (Pisces: Tetraodontiformes: Balistidae) from off Okinawa, Japan. Syst Parasitol 74, 225–237 (2009). https://doi.org/10.1007/s11230-009-9208-4
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DOI: https://doi.org/10.1007/s11230-009-9208-4