Deontostoma quadridentatum




Rev: 02/19/2023

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Deontostoma quadridentatum Shimada & Jimi, 2022


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Morphology and Anatomy:

With general characteristics of the subfamily Deontostomatinae

Unique to this species:



  • Body similar to those of males
  •  Several somatic subventral setae present in preanal region..
  •  Tail slightly longer than in males,
  • Didelphic, amphidelphic with opposed, telogonic, and antidromously reflexed ovaries, both on left side of intestine.
  • Vulva  slit-like at 56-60% of body length.
  • Vagina with thick cuticular wall, surrounded by vaginal glands

Ref Shimada & Jimi, 2022



  • Diorchic, testes opposed, outstretched.
  • Seminal vesicle inconspicuous. Vas deferens beginning at 54-56% of body length and leading to muscular ejaculatory duct at 72-76% of body length.
  • Spiculespaired, slightly arcuate, length 1.6- 2.3 cloacal body diam., flattened and curved outward: capitulum slightly enlarged; calomus short; lamina with central lamella(e) and terminal pore; ventral velum present.
  • Gubernacula  paired, on outsides of spicules: corpus slightly arcuate and parallel to spicule,
  • One precloacal ventromedian supplement
  • Two precloacal subventral rows of 8-10 setae beginning just anterior to cloaca followed by 12-20 papillae with setae.
  • Tail 1.0-1.1 cloacal body diam., conical, with blunt tip.
  • Caudal glands extending anterior to cloaca
  •  Spinneret with minute terminal pore. Eight rows of caudal setae present

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


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Described from Southern Ocean, off the South Orkney Islands

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Free-living marine 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:

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Hope, W.D. 1982. Structure of head and stoma of the marine nematode genus Deontostoma (Enoplidae: Leptosomatidae). Smithsonian Contrib. Zool. 353.

Leduc, D. (2013). Deontostoma tridentum n. sp. (Nematoda, Leptosomatidae) from the continental slope of New Zealand. Zootaxa 3722, 483-492. DOI: 10.11646/zootaxa.3722.4.3

Shimada, D., Jimi, N. 2022. Taxonomic revision of the free-living marine nematode genus Deontostoma (Enoplida: Leptosomatidae) and inclusion of a new species from the Southern Ocean. Nematology 24:1031-1047..doi:


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Copyright 1999 by Howard Ferris.
Revised: February 19, 2023.