Leptonchus granulosus




Rev 09/25/2020

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                     Leptonchus granulosus Cobb, 1920
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Morphology and Anatomy:


Leptonchus granulosus: anterior region, posterior region and female gonad.

Drawings from Peralta and Pena-Santiago, 1996


  •  Siender nematodes, small to medium size.

  • Outer layer of the cuticle thin and smooth. Inner layer thicker, with irreguJar outline and detached from the outer layer; radial refractive elements abundant, very conspicuous at the tail.

  • Lateral chord occupying about one-third of the midbody diameter.

  •  Lateral pores coarse, arranged in two rows and located in the borders of the lateral chord.

  • Lip region cap-like, with angular contour, offset from body contour by a marked constriction, twice as wide as high.

  • Lips moderately separated; their inner parts prominent.

  • Cephalic and labial papillae distinct.

  • Arnphid funnel-shaped, aperture at level of the cephalic constriction, aperture two-thirds of the lip region diameter.

  • Stoma a truncate cone with sclerotized walls surrounding oral aperture.

  • Guiding ring simple, slightly refractive.

  • Odontostyle very thin, slightly dorsally curved, slightly shorter than the lip region diameter.

  • Odontophore slightly ventrally arched and surrounded by esophageal tissue.

  • Esophagus sIender and weakly muscular anteriorly and with a part and a cylindrical or pear-shaped basal bulb that occupies about 1/5 of total length of esophagus.

  •  Cardia bilobed and surrounded by intestinal tissue.

  • Prerectum very long, its length about 22-29 x anal body diameter; rectum slightly longer 1 x anal body diameter.

  • Genital system amphidelphic-didelphic. Ovaries reflexed, short, with few oocytes. No sperm in genital system, probably parthenogenetic.

  • Vagina conical or pear-shaped; vulva a transverse slit.

  •  Tail shorter than anal body diameter; rounded-conoid to hemispherical.

  • Two pairs of caudal pores, one subdorsal anteriorly located and the other almost Iateral at the middle of the tail.

Ref:: Peralta and Pena-Santiago (1996).

Not seen.


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



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Leptonchus granulosus has been reported from Europe, North America, South America, Australia and Africa (Goseco et al , 1974).

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Classified as hyphal feeding (Yeates et al., 1993)

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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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Goseco,C.G., Ferris, V.R. and Ferris, J.M. 1974. Revisions in Leptonchoidea (Nematoda: Dorylaimida). Leptonchus, Proleptonchus, Funaria, and Meylis n.gen. in Leptonchidae, Leptonchinae. Research Bull. Ag. Exp. Sta, Purdue Univ. 911. 32p.

Peralta, M., Pena Santiago, R. 1996. Nematodes of the order Dorylaimida from Andalucia Oriental, Spain. The families Leptonchidae Thorne, 1935 and Aulolaimoididae Jairajpuri, 1964.  Fundam. appl. Nematol., 19:481-497.

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: September 25, 2020.