Two new species of the genus Parasphaerolaimus Ditlevsen, 1918 (Nematoda, Monhysterida) from water bodies of Northern Vietnam

Authors

  • Vladimir G. Gagarin Papanin Institute for Biology of Inland Waters, Russian Academy of Science
  • Nguyen Dinh Tu Nematology Department, Institute of Ecology and Biological Resources, Vietnam Academy of Sciences and Technology

DOI:

https://doi.org/10.33910/2686-9519-2019-11-4-267-278

Keywords:

Vietnam, free-living marine nematodes, new species, Parasphaerolaimus tropicus sp. nov., Parasphaerolaimus minor sp. nov.

Abstract

Two new nematode species of the genus Parasphaerolaimus Ditlevsen, 1918 were found in an artificial reservoir for shrimp cultivation and in the waters along the coastline of the South China Sea in Vietnam. P. tropicus sp. nov. is morphologically close to P. brevisetosus Gagarin, 2014, P. lodosus (Gerlach, 1956) and P. crassus (Timm, 1961). From the first species it differs in having a shorter body, longer cephalic setae, the presence of numerous and long cervical setae and absence of precloacal supplements in males. From the second species it differs in having a shorter body, a less slender tail, the presence of numerous and long cervical setae and a different arrangement of amphidial fovea. From P. crassus it differs by having a shorter cervical setae, longer spicules, larger amphidial fovea and a relatively shorter tail. P. minor sp. nov. is morphologically close to P. pilosus Zograf et al., 2017, but has a smooth cuticle, a shorter body, and shorter spicules and no cervical setae. The authors provide the dichotomy key for the identification of the valid species of the genus Parashaerolaimus.

References

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REFERENCES

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Fu, S., Boucher, G., Cai, L. (2017) Two new ovoviviparous species of the family Selachonematidae and Sphaerolaimidae (Nematoda, Chromadorida & Monhysterida) from the northern South China Sea. Zootaxa, vol. 4317, no. 1, pp. 95–110. DOI: 10.11646/zootaxa.4317.1.4 (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)

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Nguyen Vu Thanh, Gagarin, V. G. (2009) Three species of monhysterids (Nematoda, Monhysterida) from mangrove forest of the Mekong river Estuary, Vietnam. Journal of Biology (Hanoi), vol. 31, no. 2, pp. 8–15. DOI: 10.15625/0866-7160/v31n2.808 (In English)

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Quang Ngo Xuan, Nguyen Vu Thanh, Nguyen Ngoe Chau et al. (2008) One new and two unknown species of free-living marine nematodes from Cangio mangrove forest Ho Chi Minh city, Vietnam. Journal of Biology (Hanoi), vol. 30, no. 2, pp. 1–11. DOI: 10.15625/0866-7160/v30n2.5417 (In English)

Seinhorst, J. W. (1959) A rapid method for the transfer of nematodes from fixative to anhydrous glycerin. Nematologica, vol. 4, no. 1, pp. 67–69. DOI: 10.1163/187529259X00381 (In English)

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Zograf, J. K., Pavlyuk, O. N., Trebukhova, Yu. A., Nguyen Dinh Tu (2017) Revision of the genus Parasphaerolaimus (Nematoda: Sphaerolaimidae) with description of new species. Zootaxa, vol. 4232, no. 1, pp. 58–70. DOI: 10.11646/zootaxa.4232.1.4 (In English)

Published

2019-12-30

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