Two new species of the family Xyalidae Chitwood, 1951 (Nematoda, Monhysterida) from the water bodies of Vietnam
DOI:
https://doi.org/10.33910/2686-9519-2020-12-4-477-489Keywords:
Vietnam, free-living nematodes, new species, Metadesmolaimus longicaudatus sp. nov., Theristus securus sp. nov.Abstract
The paper presents an illustrated description of two nematode species of the family Xyalidae Chitwood, 1951, found in an artificial reservoir for shrimp cultivation and in the water along the coastline of the South China Sea in Vietnam. Metadesmolaimus longicaudatus sp. nov. is morphologically similar to M. aduncus Lorenzen, 1972 and M. gelana (Warwick, 1973), however, it has a shorter outer labial setae, a longer and slender tail, and longer spicules. Theristus securus sp. nov. is close to T. denticulatus Warwick, 1970 and T. discolensis Bussau, 1993, yet differs from these species in having a longer body, a cephalic capsule, longer outer labial setae, and longer spicules.
References
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Bussau, Ch. (1993) Taxonomische und okologische Untersuchungen an Nematoden des Peru-Beckens. PhD dissertation (Biology). Kiel, Christian-Albrechts-Universitat zu Kiel, 625 S. (In German)
Gagarin, V. G. (2013) Two new species of the genus Metadesmolaimus Schuurmans Stekhoven, 1935 (Nematoda, Monhysterida) from coast of Vietnam. International Journal of Nematology, vol. 23, no. 2, pp. 119–128. (In English)
Gagarin, V. G. (2018) An annotated checklist of the free-living nematodes from mangrove thickets of Vietnam. Zootaxa, vol. 4403, no. 2, pp. 261–288. DOI: 10.11646/zootaxa.4403.2.3 (In English)
Gagarin, V. G., Naumova, T. V. (2012) Two new species of Theristus Bastian, 1865 (Nematoda: Xyalidae) from the interstitial zone of Baikal, Siberia, Russia. Nematology, vol. 14, no. 4, pp. 499–508. DOI: 10.1163/156854111X612225 (In English)
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Warwick, R. M. (1970) Two new species of free-living marine nematodes from the Northumberland coast. Journal of Natural History, vol. 4, no. 4, pp. 593–598. DOI: 10.1080/00222937000770531 (In English)
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