Rev 11/19/2019

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Morphology and Anatomy Life Cycle
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Dorylaimus Dujardin, 1845

Taxonomic Note:  The genus Dorylaimus, erected by Dujardin in 1845, is the longest-described genus of the Dorylaimoidea.  Many species that are now classified in other genera of the Dorylaimida were originally assigned to this genus (Vinciguerra et al., 2016).

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Morphology and Anatomy:

  • Large nematodes, 2 to 9 mm long.
  • Cuticle thick with longitudinal ridges.
  • Lip region slightly offset from body contour; lips somewhat separated.
  • Stronmg odontostyle, length 2-3x labial diameter; aperture 1/3 of odontostyle length.
  • Guiding ring double near anterior of odontostyle.
  • Esophagus muscular, wider posterior portion about 50% of length.
  • Female genital system diovarial, amphidelphic.
  • Vulva a transverse slit.
  • Male with numerous, small, ventromedian supplements.
  • Female tail elongate to filiform; male tail short and rounded.
  • Sex ratio about equal.

Ref: Andrássy, 2009.

Dorylaimus sp.
Photo: Hanny van Megen, Wageningen University
  Dorylaimus sp. with odontostyle extended
Body size range for the species of this genus in the database - Click:
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Freshwater habitats and wet terrestrial environments.

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Categorized as omnivores (Yeates et al., 1993).

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Biology and Ecology:

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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.

Dujardin, F. (1845). Histoire naturelle des Helminthes ou vers intestinaux. Paris, France, Librairie Encyclop�dique de Roret.

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: November 19, 2019.