Labronema ferox




Rev 06/16/2023

  Classification Biology and Ecology
Morphology and Anatomy Life Cycle
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Distribution Management
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Labronema ferox Thorne, 1939


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Morphology and Anatomy:




  • Didelphic-amphidelphic, with both genital branches well and equally developed.
  • Oviduct with a slender part of prismatic cells and a poorly developed pars dilatata with small lumen.
  •  Uterus long (2.9-4.0 body diam. long) and complex, with thicker proximal region with a wide lumen, a long, slender mid-region with a pars musculosa and a small, nearly spherical, distal pars dilatata with narrow lumen.
  • Vagina extending inwards 45 or 50%)of body diam., pars proximalis surrounded by  circular musculature; pars refringens 18-19 μm broad, pars distalis 6-7 μm long.
  • Vulva  at 51-54% of body length; longitudinal, appearing as a depression measuring ca 15 μm long.
  • Prerectum 1.9 or 2.5, rectum 1.2 or 1.3 anal body diam. long.
  • Tail short and rounded, three pairs of caudal pores, one subdorsal situated nearly at level of anus, the other two subterminal.

Ref: Pena-Santiago (2019)



  • Genital system diorchic with testes opposed.
  •  Prerectum 4.3-6.4, cloaca 1.6-1.7 times longer than body diam. at cloacal aperture.
  • A precloacal pair of supplements and  20-25, nearly contiguous,  ventromedian supplements.
  •  Spicules curved ventrad, 5.4-6.1 times as long as wide, and 1.7-1.9 body diam. long at cloacal aperture; lateral guiding pieces simple, 3.0-4.5 times as long as wide.
  • Tail similar to that of female.


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



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Labronema ferox appears to be widely distributed in North America (Pena-Santiago, 2019).

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    Considered predaceous on other nematodes. 

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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:

Regulation of prey species.

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Andrassy, I. 2009. Free-living Nematodes of Hungary III.  Hungarian Natural History Museum, Budapest. 608p.

Pena-Santiago, R. 2019. Taxonomy of the genus Labronema Thorne, 1939 (Nematoda: Dorylaimida: Dorylaimidae) with redescription of its type species, L. ferox Thorne, 1939. Nematology 21:23-34.

Thorne, G. 1939. A monograph of the nematodes of the superfamily Dorylaimoidea. Capita Zool. 8: 1-263.

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: June 16, 2023.