Tylencholaimus zhongshanensis




Rev 02/21/2023

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                   Tylencholaimus zhongshanensis Wu, Xu, Xie & Wang 2019
Considered by Pena-Santiago )2020) to be morphologically indistinguishable from T. ibericus and therfore considerd a junior synonym of T. ibericus
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Morphology and Anatomy:


  • Cuticle two layers,outer layer with fine transverse striations
  • Lateral chord occupying 30% of body diameter at mid-body
  • Lip region cap shaped, offset from the body by a constriction, 2.3—2.8 times as wide as high or 30—38% of the body diameter at posterior end of the neck region.
  • Lips amalgamated, labial and cephalic papillae distinct.
  • Amphidial foveae cup shaped, opening at the level of the constriction, apertures narrow, 30% in average of the lip region width.
  • Odontostyle slender, 0.7—0.9 times the lip region width long, its aperture one-fourth to one-third of its length.
  • Odontophore rod-like with small basal knobs, 0.8—1.3 times as long as the odontostyle. Guiding ring single, indistinct.
  • Anterior part of esophagus slender, basal expansion occupying 33—38% of the total esophageal length.
  • Cardia conoid to rounded.
  • Tail hemispheroid to elongate-hemispheroid, 1.1—1.4 times the anal body diameter.


  • Genital system monodelphic-prodelphic, postvulval sac absent.
  • Junction of oviduct and uterus indistinct. Uterus simple and slender
  • Vulva transverse in ventral view.
  • Vagina approximately 46.5—57% of the corresponding body width long, anteriorly directed. Pars proximalis vaginae with conoid walls, 5—8 µm long and 6—7.5 µm wide, pars refringens lacking, pars distalis vaginae 3—4 µm long. Prerectum 3.2—4.8 times and rectum 0.6—0.9 times anal body diameter long.


Reported median body size for this species (Length mm; width micrometers; weight micrograms) - Click:


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Described from rhizosphere soil of Phalaenopsis sp. from Zhongshan, Guangdong, China.

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Classified as hyphal feeding (Yeates et al., 1993) and probably on more complex fungal structures.   

Wood (1973) observed Tylencholaimus montanus feeding and reproducing on fungi in tissue culture.

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Biology and Ecology:


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Life Cycle:


Ecophysiological Parameters:

For Ecophysiological Parameters for this species, click If species level data are not available, click for genus level parameters
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Ecosystem Functions and Services:


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Andrássy, I. 2009. Free-living Nematodes of Hungary III.  Hungarian Natural History Museum, Budapest. 608p.

Loof, P.A.A. and Jairajpuri, M.S. 1968. Taxonomic studies on the genus Tylencholaimus De Man, 1876 (Dorylaimoidea) With a Key To the Species. Nematologica 14:317-350.

Pena-Santiago, R. 2020. On the identity of some dorylaims (Dorylaimida) recently described from China. Nematology 22:957-960.

Vinciguera, M.T. 1986. New and known species of Tylencholaimus de Man, 1876 (Dorylaimida, Nematoda) from Italian beech forest with a key to the species. Nematologia Mediterranea 14:107-116.

Wood, F.H. 1973. Nematode feeding relationships: Feeding relationships of soil-dwelling nematodes. Soil Riol. Biochem. 5: 593-601.

Wu, W-J., Xu, C-L., Xie, H., Wang, D-W. 2019. Three new species, one new genus and subfamily of Dorylaimida (de man, 1876) Pearse, 1942, and revisions of the families Tylencholaimellidae Jairajpuri, 1964 and Mydonomidae Thorne, 1964 (Nematoda, Dorylaimida). PeerJ 7:e7541 https://doi.org/10.7717/peerj.7541

Yeates, G.W., T. Bongers, R. G. M. De Goede, D. W. Freckman, and S. S. Georgieva. 1993. Feeding habits in soil nematode families and genera—An outline for soil ecologists. Journal of Nematology 25:315-331


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Copyright 1999 by Howard Ferris.
Revised: February 21, 2023.