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Temnosewellia aff. vietnamensis (Platyhelminthes: Rhabdocoela: Temnocephalidae) associated with freshwater crabs from Kagoshima, southern Japan, with review of records of the genus from East to South Asian countries

Published online by Cambridge University Press:  01 August 2022

D. Uyeno*
Affiliation:
Graduate School of Science and Engineering, Kagoshima University, 1-21-35 Korimoto, Kagoshima 890-0065, Japan
T. Kaneko
Affiliation:
Ainoura Junior High School, Japan
H. Uyeno
Affiliation:
Kagoshima Museum of Environment: Planet Earth and its Future, Kagoshima, Japan
W. Miyazaki
Affiliation:
The Kagoshima City Aquarium, Kagoshima, Japan
H. Tosuji
Affiliation:
Graduate School of Science and Engineering, Kagoshima University, 1-21-35 Korimoto, Kagoshima 890-0065, Japan
*
Author for correspondence: D. Uyeno, E-mail: duyeno@sci.kagoshima-u.ac.jp

Abstract

Temnocephalids are ectosymbionts of various freshwater animals. A species tentatively identified as Temnosewellia aff. vietnamensis (Platyhelminthes: Rhabdocoela: Temnocephalidae) is reported based on materials collected from the body surface of the freshwater crabs Eriocheir japonica (Brachyura: Varunidae) and Geothelphusa exigua (Potamidae) in Kagoshima, southern Japan. The temnocephalid is characterized as follows: the cirrus composed of a cone-shaped shaft and a cylindrical introvert 42–77 μm long; the introvert covered with approximately 30 vertical rows of fine sharp spines; the four seminal receptacles; and a long, curved oviduct with vaginal gland; a pair of gland cells (Haswell's cells) present anterior to the excretory ampullae. Bayesian inference trees using partial nuclear 28S rDNA (28S) and mitochondrial cytochrome c oxidase subunit I (COI) genes supported that the specimens collected from both crab species are conspecific but these also showed the geographical variations among them on both 28S and COI. The previous records of the genus Temnosewellia in East to South Asian countries are assembled and shown on the map (fig.7, this paper).

Information

Type
Research Paper
Copyright
Copyright © The Author(s), 2022. Published by Cambridge University Press.

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