Rev 02/27/2023

  Classification Biology and Ecology
Morphology and Anatomy Life Cycle
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Calolaimus Timm, 1964

Type species of the genus: Calolaimus papillatus Timm, 1964


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Morphology and Anatomy:


  • Large nematodes, usually > 4 mm long.
  • Cuticle dorylaimoid.
  • Lip region rounded and continuous with body contour.
  • Lips amalgamated.
  • Odontostyle short, asymmetrical.
  •  Guiding ring very thick, and sclerotized.
  • Odontophore straight.
  • Anterior portion of the esophagus weakly muscular. expanding gradually into a cylindrical bulb which occupies up to 1/3 of total esophagus length.
  •  Female genital system didelphic, amphidelphic. Vulva transverse or pore-like.
  • Tail similar in sexes: elongated to filiform.

Remarks: Goseco et al. (1976) published the most recent revision.




  • Only reported for one species.
  • Dorylaimid spicules and 8 spaced ventromedian supplements.


Ref: Pena-Santiago (2006).


Body size range for the species of this genus in the database - Click:
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Some species terrestrial, others reported from freshwater habitats,

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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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Goodey, T and J.B. Goodey, 1963. Soil and Freshwater Nematodes. Methuen. London

Pena-Santiago, R. 2006. Dorylaimida Part 1. Superfamilies Belondiroidea, Nygolaimoidea and Tylencholaimoidea. Pp 326-391 in  E. Abebe, Istvan Andrassy, W. Traunspurger (eds) Freshwater Nematodes: Ecology and Taxonomy. CABI Publishing.

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Copyright © 1999 by Howard Ferris.
Revised: February 27, 2023.