Two new species of free-living nematodes (Nematoda, Monhysterida) from Mekong River mouth, Vietnam
DOI:
https://doi.org/10.33910/2686-9519-2021-13-4-536-549Keywords:
Vietnam, Mekong River mouth, free-living nematodes, new species, Sphaerotheristus rivalis sp. nov., Daptonema lissum sp. nov.Abstract
The paper presents an illustrated description of two nematode species of order Monhysterida, found in the Mekong River delta, Vietnam. Sphaerotheristus rivalis sp. nov. is morphologically similar to S. macrostoma Timm, 1968, S. bengalensis Timm, 1968 and S. pseudodentatus Timm, 1968, however it has a longer body and specific structure of spicules. Daptonema lissum sp. nov. is close to D. donghaiensis Wang, An, Huang, 2018, D. minutum (Jurio, 1974) and D. alternum (Wieser, 1956). What makes it different from the first species is a shorter outer labial setae, shorter spicules and vulva located close to the anterior body end. The new species differs from D. minutum by a longer and thicker body, longer spicules, thicker tail and fovea amphids located closer to the anterior body end. Its difference from D. alternum lies in a shorter and thicker body, thicker tail, longer spicules, shorter outerlabial setae and fovea amphids located closer to the anterior body end.
References
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Timm, R. W. (1968) Sphaerotheristus (Monhysteridae), a new marine nematode genus. Transactions of the American Microscopic Society, vol. 87, no. 2, pp. 157–164. (In English)
Wang, Ch., An, L., Nuang, Y. (2018) Two new species of Xyalidae (Monhysterida, Nematoda) from the East China Sea. Zootaxa, vol. 4514, no. 4, pp. 585–592. https://doi.org/10.11646/zootaxa.4514.4.11 (In English)
Wieser, W. (1956) Reports of the Lund University Chile Expedition 1948–1949. 26. Free-living marine nematodes. III. Axonolaimoidea and Monhysteroidea. Acta Universitets Lund, n. f., avd 2, vol. 52, no. 13, pp. 1–115. (In English)
Wieser, W., Hopper, B. (1967) Marine nematodes of the east coast of North America. I. Florida. Bulletin Museum of Comparative Zoology, vol. 135, no. 5, pp. 239–344. (In English)
Williams, D. D., Williams, N. E. (1974) A counterstaining technique for use in sorting benthic samples. Limnology and Oceanography, vol. 19, no. 1, pp. 152–154. https://doi.org/10.4319/lo.1974.19.1.0152 (In English)
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