Abstract
The blue mackerel Scomber australasicus is one of the major commercial fishes consumed in southern Japan. Three species of parasitic copepods were collected from S. australasicus in the East China Sea off the west coast of Kyushu Island, southern Japan. These copepods are each characterized based on the females: Pumiliopes scombri (Bomolochidae) differs from its congeners by the presence of fine ventral spinules on legs 2 to 4; Colobomatus itoui n. sp. (Philichthyidae) is characterized by having the cephalosome with a pair of dorsal hemispherical cephalic protrusions but without an apical cephalic process and the anal somite with a pair of posterolateral protrusions with a smooth tip; and Caligus kanagurta (Caligidae) is distinguishable from its congeners accommodated in the Caligus diaphanus-group by bearing an atypical bulged leg 4 with long protruded pectens. The collection of C. kanagurta in Japanese waters represents its new country record. Parasitic copepods reported from S. australasicus and its related species S. japonicus from the western Pacific Ocean are tabulated.
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Acknowledgements
We thank Masahide Itou and the staff of the Kasasa Fisheries Cooperative Association, those of the Ushibuka Fisheries Cooperative Association, and Hiroko Uyeno (Kagoshima Museum of Environment: Planet Earth and its Future) for their kind support in sampling.
Funding
Part of this work was supported by the Japan Society for Promotion of Science (JSPS) KAKENHI Grant Number JP15H06517 and JP17K15304; “Establishment of Glocal Research and Education Network in the Amami Islands” Project of Kagoshima University adopted by the Ministry of Education, Culture, Sports, Science and Technology, Japan.
Conflict of interestThe authors have no competing interests to declare.
Author contributionsDU collected, observed, and described copepod specimens and also prepared the manuscript; KN prepared and revised the manuscript.
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Uyeno, D., Nagasawa, K. Three species of copepods parasitic on the blue mackerel Scomber australasicus Cuvier (Actinopterygii: Perciformes: Scombridae) from southern Japan, with description of a new species Colobomatus itoui n. sp. (Cyclopoida: Philichthyidae). Syst Parasitol 98, 625–640 (2021). https://doi.org/10.1007/s11230-021-10001-9
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DOI: https://doi.org/10.1007/s11230-021-10001-9