Rev 12/21/2021

  Classification Biology and Ecology
Morphology and Anatomy Life Cycle
Return to Laimydorus Menu Ecosystem Functions and Services
Distribution Management
Return to Dorylaimidae Menu Feeding  References
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Laimydorus Siddiqi, 1969

Note:  the genus name is an anagram of Dorylaimus!

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Morphology and Anatomy:

  • Large nematodes, body length 2-5.6 mm.
  • Cuticle smooth without longitudinal ridges (a difference from Dorylaimus)
  • Head region continuous with body contour or slightly offset.
  • Odontostyle strong and straight, longer than labial diameter.  Guiding ring double and obvious.
  • Females diovarial, amphidelphic, ususally with V<50%.
  • Female tail attentuated to filiform.
  • Male pre-rectum long, beginning anterior to supplements.
  • Male with 15-40 small ventomedian supplements.
  • Male tail short and rounded

(Andrassy, 2009).

Body size range for the species of this genus in the database - Click:

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Aquatic and moist habitats.

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Categorized as an omnivore (Yeates et al., 1993) and as a predator (Bilgrami and Gaugler (2005).


 Feeding activities of the predatory nematodes Laimydorus baldus and Discolaimus major preying on Hirschmanniella oryzae were studied under laboratory conditions. Discolaimus major killed more prey, and fed and aggregated longer than L. baldus.

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Biology and Ecology:


Predatory activities were greatest at 30◦C. Predators starved for 6 days detected prey rapidly and aggregated at the feeding site longest.

Predators were increasingly efficient at finding prey as prey density increased.

Prey search and predation abilities of L. baldus and D. major were governed regulated by temperature, prey density, starvation and prey incubation (Bilgrami and Gaugler, 2005).  Predators starved for 10 days exhibited maximum response to the presence of prey.  Predators detected prey kairomones at distances of 2-3 cm on agar plates (Pervez and Bilgrami, 2000),

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Life Cycle:

For Ecophysiological Parameters for this genus, click 
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Ecosystem Functions and Services:


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

Bilgrami, A.L. and Gaugler, R. 2005. Feeding behaviour of the predatory nematodes Laimydorus baldus and Discolaimus major (Nematoda: Dorylaimida). Nematology 7:11-20.

Loof, P.A.A. 1996. Dichotomous and polytomous identification keys for females of the genera Prodorylaimus Andrassy, 1959 and Laimydorus Siddiqi, 1969 (Nematoda: Dorylaimoidea). Russian J. Nematology 4:7-28.

Pervez, R., Bilgrami, A.L. 2000. Some factors influencing chemoattraction behaviour of dorylaim predators, Laimydorus baldus and Discolaimus major towards prey kairomones. International Journal of Nematology  10:41-48.

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: December 21, 2021.