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Fecampiid flatworms parasitic in a tanaidacean crustacean

Published online by Cambridge University Press:  10 February 2025

K. Kakui*
Affiliation:
Department of Biological Sciences, Faculty of Science, Hokkaido University, Sapporo 060-0810, Japan
S. Shiraki
Affiliation:
Department of Natural History Sciences, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan
N. Hookabe
Affiliation:
Research Institute for Global Change, Japan Agency for Marine-Earth Science and Technology, Yokosuka 237-0061, Japan
*
Corresponding author: K. Kakui; Email: kakui@eis.hokudai.ac.jp

Abstract

We report the first record of fecampiidan platyhelminths parasitic in tanaidacean crustaceans. Two fecampiidans (0.75 mm and 1.10 mm in length) were found in a female of Pseudotanais sp. (Pseudotanaidae; 1.75 mm in length) collected at 794 m depth off the southern coast of Japan, northwestern Pacific. Fresh individuals were yellow or light yellow, but completely faded in ethanol. In a maximum likelihood tree based on 28S rRNA sequences, the parasite was placed in a moderately-supported Fecampiidae clade, suggesting it is a member of Fecampiidae. The 28S sequence from the parasite was 25.0%, 32.6%, and 35.5% divergent in Kimura 2-parameter (K2P) distance from Fecampia cf. abyssicola, Kronborgia cf. amphipodicola, and Kronborgia isopodicola sequences, respectively.

Type
Short Communication
Copyright
© The Author(s), 2025. Published by Cambridge University Press

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