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Morphological and molecular characteristics of trematodes Orientocreadium pseudobagri Yamaguti, 1934, and Orientocreadium elegans Besprozvannykh, Ermolenko, and Devenev 2009 (Digenea: Orientocreadiidae Yamaguti, 1958) from the south of the Russian Far East

Published online by Cambridge University Press:  09 October 2025

D.M. Atopkin Open the ORCID record for D.M. Atopkin [Opens in a new window] ,
A.V. Izrailskaia Open the ORCID record for A.V. Izrailskaia [Opens in a new window] ,
A.Y. Khamatova  and
V.V. Besprozvannykh
D.M. Atopkin*
Affiliation:
Federal Scientific Center of East Asia Terrestrial Biodiversity, Far Eastern Branch of Russian Academy of Sciences, Vladivostok, Russia
A.V. Izrailskaia
Affiliation:
Federal Scientific Center of East Asia Terrestrial Biodiversity, Far Eastern Branch of Russian Academy of Sciences, Vladivostok, Russia
A.Y. Khamatova
Affiliation:
Zhirmunsky National Scientific Center of Marine Biology, Far Eastern Branch, Russian Academy of Sciences, Vladivostok, Russia
V.V. Besprozvannykh
Affiliation:
Federal Scientific Center of East Asia Terrestrial Biodiversity, Far Eastern Branch of Russian Academy of Sciences, Vladivostok, Russia
*
Corresponding author: D.M. Atopkin; Email: atopkin@biosoil.ru
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Abstract

Based on morphological and molecular studies, including analysis of variation of four molecular markers, there are two orientocreadiid species, Orientocreadium cf. pseudobagri and O. cf. elegans, in the south of the Russian Far East. Trematodes of these two species possess morphological and molecular variation that is most possibly related to population formation processes for these species in the investigated territory. Our molecular data show that the trematode assemblages studied were subdivided for 28S rDNA markers into two large groups related to basins in different water bodies. Nucleotide sequences of these groups are closely related to each other. Within each group there are specific nucleotide substitutions that are unique for several geographical local samples of trematodes. This variation reflects local processes of divergence of these worms. Results of the median-joining network analysis based on concatenated mitochondrial cox1 and nd1 gene sequences support this inference, showing the existence of four groups of haplotypes of Orientocreadium trematodes that are associated with geographical locations.

Keywords

OrientocreadiidaeOrientocreadium18S28SPerccottusRussian Far Eastnucleotide sequences

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Type
Research Paper
Information
Journal of Helminthology , Volume 99 , 2025 , e113
Copyright
© The Author(s), 2025. Published by Cambridge University Press

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