Rev 09/12/2023

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Cacopaurus Thorne, 1943

Type specie of the genus: Cacopaurus pestis, Thornes. 1943


Paratylenchus (Thorne, 1943) Goodey, 1963.  However, Raski and Luc (1987) disagreed with the synonymy  and proposed retaining Cacopaurus as a valid genus.

Cacopaurus is distinguished from the genus Gracilacus (Raski, 1962) by:

  1. the elongation of the body posterior to the vulva, compared to the very short and blunt tail in Cacopaurus.
  2. the finely annulated cuticle without ornamentation.

(Raski, 1976)

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Morphology and Anatomy:


Female: Body very small (0.2 to 0.3 mm), cylindroid-obese (a = 5 to 8). 

Cuticle thin, bearing minute tubercles.  

Lateral field with four lines, ornamented with rows of tubercles.  

Labial framework weakly developed.  

Stylet very long (92 to 102 µm) in regard to body size.  

Vulva very posteriorly situated; postvulval part very short, conoid.  

Uterus with thick wall.                                                               

Male: No stylet.

Esophagus degenerated. 

Caudal alae weakly developed, adanal.

Juvenile: Stylet well developed.

[Ref: Raski & Luc,  (1987).] 

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

D-rated pest in California Nematode Pest Rating System.

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Females have long stylet, swell when mature, and probably do not move once they start feeding - sessile.  

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Described by Thorne on Walnut.
For an extensive host range list for this genus, click
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Life Cycle:

For Ecophysiological Parameters for this genus, click 
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Ghaderi, R., Geraert, E., Karegar, A. 2016. TheTylenchulidae of the World. Academia Press, Ghent, Belgium

Raski, D.J. and Luc, M. 1987. A reapraisal of Tylenchina (Nemata) 10. The superfamily Criconematidea Taylor, 1936., Rev. Nematol. 10: 409-444..

Raski, D.J. 1976. Revision of the Genus Paratylenchus Micoletzky, 1922 and Descriptions of New Species. Part III of Three parts--Gracilacus. J. Nematology 8:97-115.

Thorne, G. 1943. Cacopaurus pestis n.g, n.sp. (Nematoda: Criconematoinae), a destructive parasite of the walnut Juglans regia Linn.  Proc. Helminth. Soc. Wash 10:78-83.


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Copyright © 1999 by Howard Ferris.
Revised: September 12, 2023.