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Pseudohatschekiidae, a new family for Pseudohatschekia branchiostegi Yamaguti, 1939 (Crustacea: Copepoda: Siphonostomatoida) from Branchiostegus spp. (Teleostei: Perciformes: Malacanthidae) in Japanese waters, with descriptions of the early developmental stages of P. branchiostegi

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Abstract

The siphonostomatoid copepod Pseudohatschekia branchiostegi Yamaguti, 1939 is redescribed in detail based on specimens of both sexes collected from the gill filaments of three species of Branchiostegus Rafinesque (Teleostei: Malacanthidae) captured in Japanese waters. Descriptions of two naupliar stages and the infective copepodid stage of P. branchiostegi are also provided for the first time, and P. mebaru Yamaguti, 1939 is recognised herein as a junior synonym of P. branchiostegi. The latter copepod species represents a new family, the Pseudohatschekiidae fam. nov., of the Siphonostomatoida characterised by the following apomorphies: (a) two free pedigerous somites present between the cephalothorax and the genital complex; (b) a chelate antenna bearing two digitate processes and a thin cuticular covering; (c) a unilobate maxillule, with the palp completely fused to the endite and represented by a surface seta; (d) a rounded process furnished with pectinate membranes on the apex of the maxillary basis; (e) 2-segmented rami on legs 1–3; and (f) the absence of leg 4. It is also now evident that P. branchiostegi is a relatively common and abundant parasite of Branchiostegus spp. in the Far East.

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Acknowledgements

We thank Jun Araki (Meguro Parasitological Museum, Japan) and Toshiaki Kuramochi (National Museum of Nature and Science, Japan) for kindly arranging loans of copepod material, Tetsuo Yoshino (University of the Ryukyus) for allowing us to collect copepods from preserved fish specimens, Takeshi Sasaki (University of the Ryukyus Museum) for providing laboratory support during our stay in Okinawa-jima Island, and two anonymous reviewers for their constructive comments. This research was made possible through financial support from the Ocean Exposition Commemorative Park Management Foundation, Okinawa, to K.N. and the Japan Society for Promotion of Science Postdoctoral Fellowship (Grant No. 21-09117) to D.T.

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  1. Laboratory of Aquaculture, Department of Bioresource Science, Graduate School of Biosphere Science, Hiroshima University, 1-4-4 Kagamiyama, Higashi-Hiroshima, 739-8528, Japan

    Danny Tang, Daisuke Uyeno & Kazuya Nagasawa

  2. Izawa Marine Biological Laboratory, 795-16 Kannonji, Tsu, Mie, 514-0062, Japan

    Kunihiko Izawa

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  1. Danny Tang
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Correspondence to Danny Tang.

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Tang, D., Izawa, K., Uyeno, D. et al. Pseudohatschekiidae, a new family for Pseudohatschekia branchiostegi Yamaguti, 1939 (Crustacea: Copepoda: Siphonostomatoida) from Branchiostegus spp. (Teleostei: Perciformes: Malacanthidae) in Japanese waters, with descriptions of the early developmental stages of P. branchiostegi . Syst Parasitol 77, 215–231 (2010). https://doi.org/10.1007/s11230-010-9269-4

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