Rev 12/21/2021

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Morphology and Anatomy Life Cycle
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                             Qudsianematidae (see also family Discolaimidae)

Discolaimium Thorne, 1939


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Morphology and Anatomy:


  • Body about cylindrical from the middle of the neck to a short distance in front of the anus.
  • Lateral organs number from 45-55 on each side of the body, irregular in size and arrangement, each with a connection extends through the cuticle to a pore.
  •   Lip region 1/2 as wide as base of neck, set off by a constriction, bearing an inner circlet of six and an outer circlet of ten papillae.
  • Amphids stirrup shaped, almost 1/3 as wide as lip region.
  • Spear about 2/3 as long as lip region width, the aperture occupying 1/2 its length
  • Guiding ring a muscular sheath.
  •  Esophagus irregular in width anteriorly, with strong radial musculature, narrowing as it passes through the nerve ring, then abruptly expanded in the posterior 3/5.
  • Five esophageal glands.
  • Base of esophagus surrounded by a membrane-like sheath.
  • Cardia pineapple shaped.
  • Each cell of the thick walled intestine with a group of large granules.
  • Prerectum length equal to three times the anal body diameter. Rectum length equal to anal body diameter.
  • Tail hemispheroid.


  • Vulva a transverse slit.
  • Vagina refractive, extending more than 1/3 across the body.
  • Didelphic, amphidelphic. Ovaries symmetrical, reflexed 1/2 the way back to the vulva when not displaced by developing ova.

Ref: Fielding, 1950

Discolaimium pseudoporum
A: face view; B: female tail; C: female anterior; D: tail, dorso-ventral view; E; female, entire body; F TS anterior to anus
Drawings from Fielding, 1950
Males: not seen

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

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The species illustrated, D. pseudoporum,was described from soil from a corn field in Sanford, Florida, USSA.

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 Categorized as a predator (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.

Fielding, M.J. 1950. Three new predacious nematodes. The Great Basin Naturalist 10:45-50

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.