Discovery of the fish host of the ‘planktonic’ caligid Caligus undulatus Shen & Li, 1959 (Crustacea: Copepoda: Siphonostomatoida)

Susumu Ohtsuka, and Masaki Nawata, and Yusuke Nishida, and Masato Nitta, and Katsushi Hirano, and Kenta Adachi, and Yusuke Kondo, and Balu Alagar Venmathi Maran, and Eduardo Suárez-Morales, (2020) Discovery of the fish host of the ‘planktonic’ caligid Caligus undulatus Shen & Li, 1959 (Crustacea: Copepoda: Siphonostomatoida). Biodiversity Data Journal, 8. pp. 1-11.

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Abstract

The siphonostomatoid copepod Caligus undulatus Shen & Li, 1959 has been widely reported from plankton samples obtained from neritic and oceanic waters off coasts of the Indo-West Pacific and Atlantic Oceans. Until now, its fish host has remained unknown. This copepod belongs to an intriguing group of congeners that, despite being part of a chiefly parasitic group, are consistently found as zooplankters. Quite unexpectedly, in October 2019, a fish host of C. undulatus was discovered in the Seto Inland Sea, Japan—namely, the Japanese sardinella Sardinella zunasi (Bleeker, 1854). Both juvenile (chalimus) and adult individuals of this caligid were observed as parasites of the fish host. The discovery suggests that the species has an alternative life cycle as previously proposed for other purportedly ‘planktonic’ congeners and might frequently switch hosts during the adult stage. Thus, the C. undulatus group is newly proposed as a species group in the genus, in which five species are known as planktonic. Some hypotheses on the modified life cycle of caligids also briefly discussed.

Item Type: Article
Uncontrolled Keywords: antagonism, Caligus undulatus, life cycle, plankton, Sardinella zunasi
Subjects: Q Science > Q Science (General)
Q Science > QH Natural history
Divisions: SCHOOL > Borneo Marine Research Institute
Depositing User: MDM SITI AZIZAH IDRIS
Date Deposited: 11 Sep 2020 06:48
Last Modified: 11 Sep 2020 06:48
URI: http://eprints.ums.edu.my/id/eprint/25939

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