Rev 07/21/2020

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      Cribronema Siddiqi, 1993

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Morphology and Anatomy:


Body size range for the species of this genus in the database - Click:
  • Cuticle annulated, without distinctly annulated internal layer; annuli smooth.
  • Lateral field with two wings (three incisures).
  •  Lip region weakly offset, crown-shaped, consisting of six leaf-like lips equal in size. Pairs of lips separated by primary axils and secondary axils without guard processes, U-shaped clefts of axils internally sclerotized.
  •  Six outer labial and four cephalic papilliform sensilla. Cephalic probolae trilobed, with median rectangular lobe and lateral triangular lobes. Labial probolae absent. .
  • Amphidial aperture rounded, located on lateral lips.
  • Stoma divided into cheilostom - barrel-shaped with strongly sclerotized bacilliform cheilorhabdia; gymnostom - barrel-shaped, as wide as stegostom, with strongly sclerotized plate-like gymnorhabdia; and stegostom with funnel-shaped prostegostom and variably shaped mesostego-, metastego- and telostegostom parts.
  • Stoma not armed, no metastomatal denticle .
  • Pharynx cephaloboid:; isthmus narrower than metacorpus; basal pharyngeal bulb oval, with strongly developed valves.
  • Nerve ring encircling posterior part of metacorpus. Excretory pore opens at level of nerve ring, at around the level of metacorpus or metacorpus-isthmus junction. Deirids present.


  • Reproductive system cephaloboid; posterior part of ovary straight; spermatheca present or reduced; postvulval uterine sac present; vulva protruding, flat or in a depression; vagina straight.
  • Phasmids located at level of anterior part of the tail
  • Female tail conoid, straight, tail terminus with pointed or harpoon-shaped mucro;


  • Reproductive system cephaloboid; spicules cephaloboid with manubrium and corpus of approximately equal width
  • Gubernaculum plate-like; cornua crurum absent.
  • One or two ventrosublateral pairs of genital papillae located anterior to cloaca; one ventrosublateral pair located at the level of cloacal opening; two pars located at middle of tail length; and three pairs (lateral, subventral and subdorsal) near tail terminus; there is a midventral papilla on anterior cloacal lip.
  • Rectum short (1.1-1.8 times longer than anal body diameter).
  • Phasmids located at around mid-tail in males.  male tail conoid, arcuate ventrad, tail terminus with pointed mucro.

Ref: Bostrom and Holovachov, 2019

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Both C. cribrum and C. sturhani are described from Cameroon. The species are separated by some morphometric differences and the absence of males in C. cribrum.

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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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Bostrom, S. and Holovacov. O. 2019. Description of Cribronema sturhani sp. n. (Nematoda, Rhabditida, Cephalobidae), a second species of a rare genus from Cameroon. Zootaxa 4695:2-7.

Siddiqi, M.R. (1993) Nematodes of tropical rainforests: 2. Five new genera and eight new species of cephalobs. Afro-Asian Journal of Nematology, 3, 212–225.

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Copyright © 1999 by Howard Ferris.
Revised: July 21, 2020.