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Phylogenetic characterisation of seven Unicapsula spp. (Myxozoa: Myxosporea: Multivalvulida) from commercial fish in southern China and Japan

Published online by Cambridge University Press:  26 December 2019

Ying-Chun Li ,
Souhei Tamemasa ,
Jin-Yong Zhang Open the ORCID record for Jin-Yong Zhang [Opens in a new window]  and
Hiroshi Sato Open the ORCID record for Hiroshi Sato [Opens in a new window]
Ying-Chun Li
Affiliation:
Faculty of Agricultural Science, Guangdong Ocean University, Mazhang, Zhanjiang, Guangdong524088, China
Souhei Tamemasa
Affiliation:
Laboratory of Parasitology, Joint Faculty of Veterinary Medicine, 1677-1 Yoshida, Yamaguchi753-8515, Japan
Jin-Yong Zhang
Affiliation:
Fish Diseases Laboratory, State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan430072, China
Hiroshi Sato*
Affiliation:
Laboratory of Parasitology, Joint Faculty of Veterinary Medicine, 1677-1 Yoshida, Yamaguchi753-8515, Japan
*
Author for correspondence: Hiroshi Sato, E-mail: [email protected]
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Abstract

The myxozoan genus Unicapsula Davis, 1924 (Myxosporea: Multivalvulida: Trilosporidae) is characterized as having one functional polar capsule (PC) and two rudimentary PCs in a three-valved myxospore. The plasmodia of Unicapsula spp. grow either in the myofibres or in the gills, oesophageal walls and urinary organs of marine fish. Few studies have investigated the taxonomy of Unicapsula spp. including the type species Unicapsula muscularis. Accordingly, the taxonomy of the genus was explored in the present study by using 15 new isolates of seven Unicapsula spp. (U. muscularis, U. galeata, U. andersenae, U. pyramidata, U. pflugfelderi, and two new species) that had formed pseudocysts in the trunk myofibres of commercial fish collected in southern China and Japan from November 2015 to January 2019. Two new species Unicapsula trigona n. sp., and Unicapsula motomurai n. sp. exhibited unique myxospore morphologies (semi-triangular and spherical myxospores, respectively) and 18S and 28S rDNA sequences that were distinct from those of the other Unicapsula spp. Phylogenetic analysis of the 18S and 28S rDNA sequences confirmed the monophyletic status of Unicapsula.

Keywords

Integrated taxonomyMyxozoanew host recordrDNAUnicapsula motomurai n. sp.Unicapsula trigona n. sp.Unicapsula
Type
Research Article
Information
Parasitology , Volume 147 , Issue 4 , April 2020 , pp. 448 - 464
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Copyright
Copyright © Cambridge University Press 2019

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