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Pseudolella tenuis sp. n. and Paracomesoma leptum sp. n. (Nematoda, Araeolaimida) from Vietnam

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Abstract

Illustrated descriptions of two new nematode species found in artificial reservoirs for shrimp cultivation are given: Pseudolella tenuis sp. n. and Paracomesomaleptum sp. n. The former is morphologically close to P. bengalensis (Timm 1957) and P. capera Tchesunov 1978, but differs from P. bengalensis by a shorter body, comparatively longer pharynx, shorter and less slender tail, longer stoma, shorter ventral branch of the amphideal fovea, and shorter spicules and cephalic setae. It differs from P. capera by shorter cephalic setae, wider labial region, longer ventral branch of the amphideal fovea, and longer spicules. Paracomesomaleptum sp. n. is morphologically close to P. susannae Semprucci 2015 and P. minor Gagarin et Nguyen Dinh Tu 2014. From the former species it differs by its shorter and thicker body, shorter cephalic and subcephalic setae, and less numerous precloacal supplements in the male. This new species differs from P. minor by a less slender tail, shorter cephalic and outer labial setae, the presence of subcephalic setae, and longer spicules.

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ACKNOWLEDGMENTS

The authors are greateful to V.A. Gusakov (Institute of Biology of Inland Waters, Russian Academy of Sciences) for making the micrographs of new nematode species.

Funding

This study was supported by VAST.HTQT.NGA.09/ 15–16 and under the state budget theme AAAA–A15–118012690105–0 “Fauna, Systematics, and Biology of Aquatic Invertebrates of Continental Waters.”

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Authors and Affiliations

  1. Papanin Institute for the Biology of Inland Waters, Russian Academy of Sciences, 152742, Borok, Yaroslavl oblast, Russia

    V. G. Gagarin

  2. Institute of Ecology and Biological Resources, Vietnamese Academy of Sciences and Technology, 1000, Hanoi, Vietnam

    Nguyen Dinh Tu

Authors
  1. V. G. Gagarin
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  2. Nguyen Dinh Tu
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Correspondence to V. G. Gagarin.

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Conflict of interest. The authors declare that they have no conflict 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 N. Smolina

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Gagarin, V.G., Nguyen Dinh Tu Pseudolella tenuis sp. n. and Paracomesoma leptum sp. n. (Nematoda, Araeolaimida) from Vietnam. Biol Bull Russ Acad Sci 46, 834–843 (2019). https://doi.org/10.1134/S1062359019080028

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  • DOI: https://doi.org/10.1134/S1062359019080028

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