Abstract
Adult specimens of the allocreadiid trematode Acrolichanus auriculatus (Wedl, 1858) were collected from Acipenser schrenckii Brandt from the River Amur and Amur Estuary, Acipenser ruthenus L. from the Rivers Irtysh and Oka (Asian and European parts of Russia, respectively), and Acipenser fulvescens Rafinesque from Lake Winnebago, Wisconsin, USA, and used for phylogenetic analyses based on 28S rDNA sequence data. The results supported the monophyly of Acrolichanus populations from both continents and a clear separation of A. auriculatus from other allocreadiid taxa, thus supporting the validity of the genus Acrolichanus Ward, 1917. This study formally reestablishes the genus Acrolichanus. Species of this genus differ from other allocreadiids by the following combination of morphological features: triangular mouth opening with rounded posterior corners, simple ventral, dorsolateral and dorsomedian muscular lobes on the oral sucker, stout cirrus-sac, pars prostatica with dorsal pocket, and massive cirrus with conspicuous triradiate lumen when invaginated. Specimens of the trematode from North America and the Rivers Irtysh and Oka were more closely related to each other than to the specimens from River Amur and Amur Estuary. This reflects the evolutionary divergence among sturgeons into Pacific and Atlantic clades. The phylogenetic analyses also confirmed the paraphyly of the genus Crepidostomum Braun, 1900.
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Acknowledgements
The authors are deeply thankful to Ilya I. Gordeev (Russian Federal Research Institute of Fisheries and Oceanography, Moscow) for providing material on A. auriculatus from River Oka, and to Drs V. N. Koshelev, V. Yu. Kolobov, A. P. Shmigirilov (the Khabarovsk Branch of the TINRO Center) for help in catching the Amur sturgeon. The authors thank Ron Bruch, formerly of Wisconsin Department of Natural Resources, for providing lake sturgeon samples. The authors also acknowledge support from St Norbert College.
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This study was supported by Grant of Russian Scientific Foundation, No. 17-74-20074.
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All applicable institutional, national and international guidelines for the care and use of animals were followed. The collection of parasitological material was carried out within the framework of the planned monitoring works on the Aleksinsky section of the upper reaches of the River Oka (district of the mouth of the River Nepreika) during the summer feeding of the sterlet (June 2017), by the Russian Federal Research Institute of Fisheries and Oceanography (FSBSI “VNIRO”, Moscow, Russia) in accordance with the State Task No. 076-00065-17-00. Parasitological material from sturgeons of River Irtysh was collected under permission of Federal Agency of Fisheries (permit No. 72201803003305). Amur sturgeons from Amur estuary were collected under permission of Federal Agency of Fisheries, Amur Territorial Administration (Permit No. 27-456).
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Atopkin, D.M., Sokolov, S.G., Vainutis, K.S. et al. Amended diagnosis, validity and relationships of the genus Acrolichanus Ward, 1917 (Digenea: Allocreadiidae) based on the 28S rRNA gene, and observations on its lineage diversity. Syst Parasitol 97, 143–156 (2020). https://doi.org/10.1007/s11230-020-09901-z
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DOI: https://doi.org/10.1007/s11230-020-09901-z