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Eudorylaimus chukotkanus sp. n. and E. mylnikovi sp. n. (Nematoda: Dorylaimida) from Lake El’gygytgyn (Chukotka, Russia)

  • BIOLOGY, MORPHOLOGY, AND SYSTEMATICS OF HYDROBIONTS
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Abstract

Two new nematode species of the genus Eudorylaimus Andrássy, 1959 found in Lake El’gygytgyn (Chukotka, Russia)—E. chukotkanus sp. n. and E. mylnikovi sp. n.—are described and illustrations are provided. E. chukotkanus sp. n. is close to E. similis (de Man, 1876) and E. imitatoris Gagarin, 1982. It differs from both species by a longer body and odontostyle, comparatively longer prerectum, longer spicules, more numerous precloacal supplements, and a less slender tail. E. mylnikovi sp. n. is morphologically close to E. chukotkanus sp. n., but it has a shorter body and odontostyle, a different shape of the vulva, shorter tail and spicules, and less numerous ventromedial supplements. The genus Arctidorylaimus Mulvey, Anderson, 1979 has lost its status as an independent taxon and is reduced to a synonym for the genus Eudorylaimus Andrássy, 1959. The morphological diagnosis of the genus Eudorylaimus is expanded.

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Notes

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ACKNOWLEDGMENTS

We are deeply grateful to our colleagues G.N. Markevich (Kronotsky State Reserve) and E.V. Esin (Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences) for invaluable help during the field work. Special thanks go to A.A. Prokin (Papanin Institute for Biology of Inland Waters, Russian Academy of Sciences) for providing specimens of nematodes from the samples of invertebrates collected in the lake.

Funding

The expedition and collection of material in the study area was supported by the Russian Science Foundation, project no. 18-74-10085; the study and description of new species of nematodes were carried out as part of State Task no. 121051100109-1.

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Authors and Affiliations

  1. Papanin Institute for Biology of Inland Waters, Russian Academy of Sciences, Borok, Nekouzskii raion, Yaroslavl oblast, Russia

    V. A. Gusakov

  2. Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, Moscow, Russia

    V. G. Gagarin & F. N. Shkil

  3. Moscow State University, Moscow, Russia

    D. V. Zlenko

Authors
  1. V. A. Gusakov
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  2. V. G. Gagarin
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  3. F. N. Shkil
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  4. D. V. Zlenko
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Correspondence to V. A. Gusakov.

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Conflict of interests. The authors declare that they have no conflicts of interest.

Statement on the welfare of animals. All applicable international, national, and/or institutional guidelines for the care and use of animals were followed.

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Translated by D. Martynova

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Gusakov, V.A., Gagarin, V.G., Shkil, F.N. et al. Eudorylaimus chukotkanus sp. n. and E. mylnikovi sp. n. (Nematoda: Dorylaimida) from Lake El’gygytgyn (Chukotka, Russia). Inland Water Biol 15, 97–106 (2022). https://doi.org/10.1134/S1995082922020055

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