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Two New Species of Free-Living Nematodes (Nematodes, Monhysterida) from the Mouth of the Cấm River, Vietnam

  • BIOLOGY, MORPHOLOGY, AND TAXONOMY OF AQUATIC ORGANISMS
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Abstract

Illustrated descriptions of two new free-living nematodes found in the Cấm River mouth in Vietnam are given. Eumonhystera rivalis sp. n. is morphologically similar to E. dispar (Bastian, 1865); E. sudanensis Zeidan et al., 1989; and E. maxima Gagarin, 1996, but differs by the presence of biocrystal-like bodies, amphid fovea located closer to anterior body end, and longer cephalic setae. Daptonema borealis sp. n. is similar to D. vicinus (Riemann, 1966); D. aquedulcis (Gagarin, 1987); and D. salinae Gagarin, Gusakov, 2014, but has shorter body, shorter cephalic setae, and spicule size.

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ACKNOWLEDGMENTS

I am grateful to V.A. Gusakov for the microphotographs of the new nematode species.

Funding

This work was carried out as part of State Contract no. АААА-А18-118012690105-0 and with partial financial support from the ÐA-47 program, grant YAST.ÐA 47.12/16-19.

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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. G. Gagarin

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  1. V. G. Gagarin
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Correspondence to V. G. Gagarin.

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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

Abbreviations: a, ratio of body length to its maximal width; b, ratio of body length to pharynx length; c, ratio of body length to tail length; с, ratio of tail length to body width in the anus or cloaca area; L, body length, μm; V, the ratio of the distance from vulva to the anterior end of the body to the body length, %.

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Gagarin, V.G. Two New Species of Free-Living Nematodes (Nematodes, Monhysterida) from the Mouth of the Cấm River, Vietnam. Inland Water Biol 14, 1–9 (2021). https://doi.org/10.1134/S1995082921010028

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