Eucephalobus oxyuroides




Rev 05/12/2022

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           Eucephalobus oxyuroides  (de Man, 1876) Steiner, 1937


Cephalobus oxyuroides de Man, 1876

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Morphology and Anatomy:

Ref:  Abolafia and Pena-Santiago, 2020



  • Monodelphic-prodelphic. Ovary is 116 to 160 um long, usually with a flexure at its distal portion.
  • Oviduct is very short, slightly areolate; spermatheca is 1.0 to 1.8 times the corresponding body diameter long.
  • Uterus 2.5 to 3.5 times as long as body diameter, tubular, and sometimes containing eggs .
  • Post-vulval uterine sac is swollen,  2.0 to 2.5 times as long as the body diameter.
  • Vagina  extending inwards over 35 to 42% of the body diameter.
  • Vulva is slightly protruding.
  • Rectum is short, 1.1 to 1.7 times the anal body width; three large gland-like cells are distinguishable around the intestine-rectum junction.
  • Tail is conical-elongate with acute terminus.
  • Phasmids are located at 28 to 33% of tail length from anus, and lateral fields terminating at phasmids.


  • Reproductive system is monorchic, with testis reflexed ventrad anteriorly.
  • Spicules are paired and symmetrical: manubrium is rounded, well developed and ventrad bent, short conoid calamus, and slightly curved ventrad lamina with acute tip in lateral view.
  • Gubernaculum is well developed, slightly curved, about one-half of the spicule length, with thin corpus.
  • Three small gland-like cells are distinguishable around the beginning of the cloaca.
  • Tail is conical, slightly curved ventrad, ending in an elongate acute mucro.
  • Genital papillae -seven pairs, two pre-cloacal and five post-cloacal: two pairs subventral at the middle of tail length, two ventral subterminal, and one lateral subterminal. One mid-ventral ad-cloacal papilla is present.
  • Phasmids are at 46 to 55% of tail length from the cloacal aperture, close to middle genital papillae.


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


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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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Abolafia, J., Pena-Santiago, R. 2020. On the identity of Eucephalobus oxyuroides (de Man, 1876) Steiner, 1936 (Rhabditida, Cephalobidae), with an updated taxonomy of the genus and notes about its phylogeny. J. Nematology 52: | DOI: 10.21307/jofnem-2020-061


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Copyright © 1999 by Howard Ferris.
Revised: May 12, 2022.