Inland Water Biology

, Volume 12, Issue 1, pp 21–31 | Cite as

Two New Species of Free-Living Nematodes of the Family Linhomoeidae (Nematoda, Monhysterida) from Mangrove Forests in Vietnam

  • V. G. GagarinEmail author


An illustrated description of two species of free-living nematodes of the family Linhomoeidae Filipjev, 1922, new to science, found in the sediments of a thick mangrove forest in the Yên River, Vietnam, is presented. Desmolaimus minor sp. n. is morphologically similar to D. calvus Gerlach, 1956, but has a shorter body, two-separate internal cavity of pharynx, and setiform labial and cephalic sensilla. A review of species of the genus Desmolaimus de Man, 1888 is made, and a pictorial key to determinate valid species of this genus is provided. Terschellingia yenensis sp. n. is similar to T. lissa Timm, 1962 and T. longissimicaudata Timm, 1962. It differs from T. lissa by the presence of precloacal supplements in males, the presence of cervical setae, a longer tail, and shorter spicules; it differs from T. longissimicaudata by a comparatively longer tail, shorter spicules, and a longer dorsal apophysis of gubernaculum.


Vietnam mangrove forests Yên River free-living nematodes Desmolaimusminor sp. n. Terschellingia yenensis sp. n. 



This work was financially supported by the National Fund for Science and Technology Development (NAFOSTED) of Vietnam, grant no. 106.12-2012.31.


Conflict of interests. 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.


  1. 1.
    Nguyen Vu Thanh and Gagarin, V.G., Two new species of free-living marine nematodes (Nematoda, Enoplida) from the Yen River estuary, Vietnam, Biol. Morya, 2015, vol. 41, no. 5, pp. 340–348.Google Scholar
  2. 2.
    Nguyen Dinh Tu, Gagarin, V.G., Fank Ke Long, et al., Description of two new species of free-living marine nematodes (Nematoda) from the Yen River estuary, Vietnam, Biol. Morya, 2016, vol. 42, no. 3, pp. 430–448.Google Scholar
  3. 3.
    Allgén, C., Die Freilebenden Nematoden des Öresunds, Capita Zool., 1933, vol. 4, no. 2, pp. 1–162.Google Scholar
  4. 4.
    Allgén, C., Die freilebenden nematoden des oresunds, Capita Zool., 1935, vol. 6, no. (3), pp. 1–192.Google Scholar
  5. 5.
    Allgén, C., Free-living marine nematodes, Further Zool. Results Swed. Antract. Exped., 1959, vol. 5, no. 2, pp. 1–293.Google Scholar
  6. 6.
    Armenteros, M., Ruiz-Abierno, A., Vinx, M., and Decraemer, W., A morphomentric analysis of the genus Tershellingia (Nematoda: Linhomoeidae) with redefinition of the genus and key to the species, J. Mar. Biol. Assoc. U. K., 2009, pp. 1–11.Google Scholar
  7. 7.
    Biology Catalogue: Nematoda, Family Linhomoeidae, Texas Univ., 2010. http:/insects. collection/hallan/Nematoda/Family/Linhomoeidae.Txt.Google Scholar
  8. 8.
    Gagarin, V.G. and Nguyen Vu Thanh, Two new species of free-living nematodes (Nematoda, Chromadorea) from mangrove thicket in Vietnam, Inland Water Biol., 2014, vol. 7, no. 4, pp. 338–347. doi CrossRefGoogle Scholar
  9. 9.
    Gagarin, V.G. and Nguyen Vu Thanh, Subsphaerolaimus minor sp. n. and Micromicron cephalatum Cobb, 1920 (Nematoda) from the Yen River estuary of Vietnam, Zootaxa, 2015, vol. 3994, no. 3, pp. 396–410.CrossRefGoogle Scholar
  10. 10.
    Gerlach, S.A., Brasilainische Meeres-Nematoden I, Bol. Inst. Okean., 1956, vol. 5, fast. 1, 2, pp. 3–69.Google Scholar
  11. 11.
    Gerlach, S.A., Marine Nematoden aus dem Mangrove-Gebiet von Cananéia (Brasilische Meeres Nematoden III, Abh. Akad. Wiss. Lit. Mainz (Math. Natur. Kl.), 1957, no. 5, pp. 129–176.Google Scholar
  12. 12.
    Gerlach, S.A., Über freilebende Meeresnematoden. Revision der Linhomoedae, Zool. Jb. Syst., 1963, vol. 90, pp. 599–658.Google Scholar
  13. 13.
    Fonseca, G. and Bezerra, T.N., Order Monhysterida Filipjev, 1929, in Handbook of Zoology. Gastrotricha, Cycloneuralia and Gnathifera: 2. Nematoda, Berlin: De Gruyter, 2014, pp. 435–465.Google Scholar
  14. 14.
    Fonseca, G. and Decraemer, W., State of the art of the free-living marine Monhysteridae (Nematoda), J. Mar. Biol. Assoc. U. K., 2008, vol. 88, no. 7, pp. 1371–1390.CrossRefGoogle Scholar
  15. 15.
    Kreis, H.A., Freilebende marine Nematoden von der Nordwest-Kueste Franreichs (Trébeurden: côtes du Nord), Capita Zool. Deel II Apl., 1929, pp. 1–112.Google Scholar
  16. 16.
    Leduc, D. and Gwyther, J., Description of new species of Setosabatieria and Desmolaimus (Nematoda: Monhysterida) and a checklist of New Zeeland free-living marine nematode species, N. Z. J. Mar. Freshwater Res., 2008, vol. 42, pp. 339–362.CrossRefGoogle Scholar
  17. 17.
    Lorenzen, S., Freilebende Meeresnematoden aus dem Schlickwatt und den Salzwiesen der Nordseeküste, Veroff. Inst. Meeresforsch. Bremerh., 1969, vol. 11, pp. 195–238.Google Scholar
  18. 18.
    de Man, J.G., Die einheimischen, frei in der reinen Erde und im Süssen Wasser Lebende Nematoden monographisch bearbeitet, Vorläufiger Bericht and descripted-systematischer Theil, Tijdschr. Ned. Dierk Veeren, 1880, vol. 5, pp. 1–104.Google Scholar
  19. 19.
    Timm, R.H., Marine nematodes of the family Linhomoidae from the Arabian Sea at Karachi, Can. J. Zool., 1962, vol. 40, pp. 165–178.CrossRefGoogle Scholar
  20. 20.
    Warwick, R.M., Platt, H.M., and Somerfield, P.J., Free-living marine nematodes. Part 3. British monhysterids, Synop. Br. Fauna (New Ser.), 1998, no. 53, pp. 1–160.Google Scholar
  21. 21.
    Wieser, W., Free-Living Nematodes and Other Small Invertebrates of Puget Sound Beaches, Seattle: University of Washington Press, 1959, pp. 1–179.Google Scholar

Copyright information

© Pleiades Publishing, Ltd. 2019

Authors and Affiliations

  1. 1.Papanin Institute for Biology of Inland Waters, Russian Academy of SciencesBorokRussia

Personalised recommendations