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Description of a metacercaria of a zoogonid trematode Steganoderma cf. eamiqtrema Blend and Racz, 2020 (Microphalloidea: Zoogonidae), with notes on the phylogenetic position of the genus Steganoderma Stafford, 1904, and resurrection of the subfamily Lecithostaphylinae Odhner, 1911

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Abstract

Metacercariae of the zoogonid trematode Steganoderma cf. eamiqtrema ex crab Chionoecetes bairdi caught in the Sea of Okhotsk were described using morphological and molecular-genetic (ITS2 region, 28S rRNA and nd1 genes) data. These are the first molecular-genetic data for the genus Steganoderma. The studied trematodes differed from S. eamiqtrema in having a much larger body size. The phylogenetic analysis based on the 28S rRNA gene supported neither the current taxonomic hypothesis that Steganoderma belongs to the subfamily Lepidophyllinae nor the earlier views that the Steganodermatinae and the Lecithostaphylinae are synonymous. The topology of the phylogenetic tree shows that the Steganodermatinae and the Lecithostaphylinae are independent subfamilies. However, morphological differences between them are obscure. Until morphological evidence for the Steganodermatinae is found, we propose to distinguish the subfamily Lepidophyllinae sensu stricto with the genera Lepidophyllus and Urinatrema, and the subfamily Lecithostaphylinae sensu lato uniting all the other former lepidophyllines. Thus, for now, we propose to consider the Steganodermatinae as a conditional synonym for Lecithostaphylinae sensu lato.

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Acknowledgements

The authors are grateful to the crew of the RV Professor Kaganovsky for assistance in fieldwork, to Dr. Gerardo Pérez Ponce de León (UNAM, Mexico) and Dr. Jesús S. Hernández-Ort (Institute of Parasitology, Czech Republic) for help with the literature, and to Dr. Anastasia Sogrina (Russian Federal Research Institute of Fisheries and Oceanography, Moscow) for assistance with material transportation.

Funding

This work is part of the state-supported studies in the Center of Parasitology, A.N. Severtsov Institute of Ecology and Evolution of RAS (project no. 0109–2018–0075).

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Authors and Affiliations

  1. A.N. Severtsov Institute of Ecology and Evolution, Moscow, Russia

    Sergey Sokolov

  2. Department of Invertebrate Zoology, St. Petersburg State University, St. Petersburg, Russia

    Sergey Shchenkov

  3. Russian Federal Research Institute of Fisheries and Oceanography, Moscow, Russia

    Ilya Gordeev

  4. Lomonosov Moscow State University, Moscow, Russia

    Ilya Gordeev

  5. Kamchatka branch of Russian Federal Research Institute of Fisheries and Oceanography, Petropavlovsk-Kamchatsky, Russia

    Tatyana Ryazanova

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  1. Sergey Sokolov
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Sokolov, S., Shchenkov, S., Gordeev, I. et al. Description of a metacercaria of a zoogonid trematode Steganoderma cf. eamiqtrema Blend and Racz, 2020 (Microphalloidea: Zoogonidae), with notes on the phylogenetic position of the genus Steganoderma Stafford, 1904, and resurrection of the subfamily Lecithostaphylinae Odhner, 1911. Parasitol Res 120, 1669–1676 (2021). https://doi.org/10.1007/s00436-021-07151-6

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