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Phylogeny of two accacoeliid species (Digenea: Hemiuroidea) ex Mola mola (Linnaeus, 1758) (Tetraodontiformes: Molidae) from Northwest Pacific, with first molecular data on Odhnerium Yamaguti, 1934

Published online by Cambridge University Press:  14 May 2025

S.G. Sokolov Open the ORCID record for S.G. Sokolov [Opens in a new window] ,
I.I. Gordeev Open the ORCID record for I.I. Gordeev [Opens in a new window]  and
D.M. Atopkin Open the ORCID record for D.M. Atopkin [Opens in a new window]
S.G. Sokolov
Affiliation:
A.N. Severtsov Institute of Ecology and Evolution of RAS, Leninskiy Pros. 33, Moscow 119071, Russia
I.I. Gordeev
Affiliation:
Pacific Salmon Department, Russian Federal Research Institute of Fisheries and Oceanography, Okruzhnoy Pr. 19, Moscow 105187, Russia Department of Invertebrate Zoology, Faculty of Biology, Lomonosov Moscow State University, Leninskie Gory 1/12, Moscow 119234, Russia
D.M. Atopkin*
Affiliation:
Federal Scientific Center of the East Asia Terrestrial Biodiversity, Far Eastern Branch of Russian Academy of Sciences, Vladivostok, Russia
*
Corresponding author: D.M. Atopkin; Email: atop82@gmail.com
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Abstract

Accacoeliid digeneans associated with fish of the family Molidae exhibit enigmatically high taxonomic diversity. However, the phylogenetic relationships between species within this digenean taxon are poorly understood. In the present study, the first nuclear 28S rRNA gene, ITS2 region of nuclear DNA, and mitochondrial cox1 gene sequence datasets were obtained for two members of the Accacoeliidae, a type and only species of the genus Odhnerium Yamaguti 1934 and an unidentified Accacladocoelium sp. collected from Mola mola (Linnaeus, 1758) off Iturup Island. Analyses of molecular differentiation and phylogenetic relationships indicate that Accacladocoelium sp. is a sister species to Accacladocoelium nigroflavum (Rudolphi, 1819). The genus Odhnerium is closely related to Tetrochetus Looss, 1912, on the 28S rRNA gene-based phylogenetic tree. Results of phylogenetic analysis based on both the mitochondrial cox1 gene and the concatenated ribosomal ITS2 region and cox1 gene of mtDNA show that the genus Odhnerium is close to the A. nigroflavum + Accacladocoelium sp. clade. In turn, the genus Accacladocoelium does not have monophyletic status in the trees reconstructed from these data.

Keywords

AccacoeliidaeAccacladocoeliumfishTrematodasystematics
Type
Short Communication
Information
Journal of Helminthology , Volume 99 , 2025 , e61
Copyright
© The Author(s), 2025. Published by Cambridge University Press

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