Skip to main content Skip to main navigation menu Skip to site footer
Type: Article
Published: 2019-08-15
Page range: 170–176
Abstract views: 52
PDF downloaded: 1

Thalassironus filiformis sp. nov. (Nematoda, Enoplida) from the South China Sea

Department of Marine Organism Taxonomy and phylogeny, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China University of Chinese Academy of Science, Beijing 100049, China
College of Life Sciences, Liaocheng University, Liaocheng 252059, China.
Department of Marine Organism Taxonomy and phylogeny, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China University of Chinese Academy of Science, Beijing 100049, China Center for Ocean Mega-Science, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
Nematoda free-living marine nematode new species taxonomy

Abstract

A new species of the genus Thalassironus de Man, 1889, which was discovered from marine sediments in the South China Sea, is described here as Thalassironus filiformis sp. nov. The new species is characterized by having short outer labial setae and cephalic setae of equal length, long filiform tail, buccal cavity with three anterior teeth and three additional teeth just posterior to amphideal fovea, male with a segmented midventral precloacal seta, spicules double curved, slender with ventral ala. It is very similar to Thalassironus lynnae Keppner, 1987, but can be differentiated from the latter species by much shorter cephalic setae (8 μm vs 14–16 μm), longer tail (772–780 μm vs 300–506 μm), longer spicules (67–68 μm vs 35–40 μm), smaller value of de Man ratio “a” (66 vs 99.7–102) and different structure of spicules. An updated dichotomous key to all known species of Thalassironus is provided.

 

References

  1. Fu, S.J., Cai, L.Z., Boucher, G., Cao, J. & Wu, C. (2013) Two new Richtersia species from the northern Beibu Gulf. Journal of Natural History, 47 (29–30), 1921–1931.

    https://doi.org/10.1080/00222933.2013.769640

    Guilini, K., Bezerra, T.N., Eisendle-Flöckner, U., Deprez, T., Fonseca, G., Holovachov, O., Leduc, D., Miljutin, D., Moens, T., Sharma, J., Smol, N., Tchesunov, A., Mokievsky, V., Vanaverbeke, J., Vanreusel, A., Venekey, V. & Vincx, M. (2018) NeMys: World Database of Free-Living Marine Nematodes. Available from: http://nemys.ugent (accessed 1 December 2018)

    Higgins, R.P. & Thiel, H. (1988) Introduction to the Study of Meiofauna. Smithsonian Institution Press, Washington, D.C., 488 pp.

    Huang, M. (2018) Studies on taxonomy of free-living nematodes from Hainan Island in the South China Sea. Master's degree thesis, Liaocheng University, Liaocheng, 119 pp.

    Huang, M., Jia, S.S. & Huang, Y. (2018) One new species and one new record of the species of the family Comesomatidae (Nematoda: Chromadorida) from the South China Sea. Zootaxa, 4504 (1), 119–127.

    https://doi.org/10.11646/zootaxa.4504.1.6

    Jeong, R., Tchesunov, A.V. & Lee, W. (2019) A new species of the genus Thalassironus (Nematoda: Enoplida: Ironidae) from the coasts of South Korea. Zootaxa, 4563 (3), 516–530.

    https://doi.org/10.11646/zootaxa.4563.3.6

    Jia, S.S. & Huang, Y. (2019) Elzalia heterospiculata sp. nov. (Nematoda: Monhysterida: Xyalidae) from the South China Sea. Zootaxa, 4603 (3), 568–574.

    https://doi.org/10.11646/zootaxa.4603.3.9

    Jonge, V.N. & Bouwman, L.A. (1977) A simple density separation technique for quantitative isolation of meiobenthos using the colloidal silica Ludox-TM. Marine Biology, 42, 143–148.

    https://doi.org/10.1007/BF00391564

    Keppner, E.J. (1987) Observations on three known free-living marine nematodes of the family Ironidae (Nematoda: Enoplida) and a description of Thalassironus lynnae n. sp. from north-west Florida. Proceedings of Biological Society of Washington, 100, 1023–1035.

    Keppner, E.J. (1991) A New Species of Free-Living Marine Nematode, Thalassironus thalassinus n. sp. (Nematoda: Ironidae), from Northwest Florida, U.S.A. Transactions of the American Microscopical Society, 110 (4), 364–367.

    https://doi.org/10.2307/3226774

    de Man, J.G. (1889). Espèces et genres nouveaux de Nématodes libres de la mer du Nord et de la Manche. Mémoires de la Société Zoologique de France, 2, 1–10.

    McIntyre, A.D. & Warwick, R.M. (1984) Meiofauna techniques. In: Holme, N.A. & McIntyre, A.D. (Eds.), Methods for the study of marine benthos. Blackwell Scientific Publications, Oxford, pp. 217–244.

    Smol, N., Muthumbi, A. & Sharma, J. (2014) Order Enoplida. In: Schmidt-Rhaesa, A. (Ed.), Handbook of Zoology. Vol. 2. Nematoda. Walter de Gruyter GmbH, Berlin/Boston, pp. 193–249.

    Sun, J. & Huang, Y. (2016) A new genus of free-living nematode (Enoplida: Enchelidiidae) from the South China Sea. Cahiers de Biologie Marine, 57, 51–56.

    Zhang, Z.N. (1990) A new species of the genus Thalassironus de Man, 1889 (Nematoda Adenophora, Ironidae) from the Bohai Sea, China. Journal of the Ocean University of Qingdao, 20 (3), 103–108.