Rev 02/27/2023

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Morphology and Anatomy Life Cycle
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Afractinca Vinciguerra & Clausi, 2000


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Morphology and Anatomy:

Nematodes in the genus Afractinca (and in the subfamily Brittonematinae of the Actinolaimidae) are cosidered to have a triprtite esophagus which consists of a very long (nonmuscular) section, a short, more msucular, middle section that tapers into an enlarged posterior region (Commans and Loof, 1986)..

Actinca and Afracticnca are closely related genera with a few relaible distinguishing characters:

Actinca: Afractinca
  • Labial field with internal (sunken) sclerotized ring
  • Six inner labial papillae behind the labial ring
  • Cuticle with 24-32 longitudinal ridges
  • Cuticle between ridges smooth (under light microscope)
  • Vulva levelling with body surface, ventro-medial longitudinal ridge(s) continuous at vulva
  • One species inhabiting East Africa, the other five Central and South America
  • Labial field with external (protruded) cuticular ring
  • Six inner labial papillae on the labial ring
  • Cuticle with 14=22 longitudinal ridges
  • Cuticle between ridges transversely striated (under ligtht microscope)
  • Vulva sunk in body contour, ventro-medial longitudinal ridge interrupted at vulva
  • All the five known species inhabiting West Africa

Ref: Andrassy, 2010






































































































































Body size range for the species of this genus in the database - Click:
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 Categorized by Yeates et al (1993) as omnivore and predator.    

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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.

Andrassy, I. 2010. Two new nematode species of the subfamily Brittonematinae (Dorylaimida: Actinolaimidae). Opusc. Zool. Budapest, 2010, 41(2): 175–190

Coomans, A. and Loof, P.A.A. 1986. Redescription of Actinolaimus costatus Schneider, 1935 (Nematoda : Actinolaimidae), with observations on its pharyngosomatic muscles and discussion of its taxonornic position. Revue Nematol. 9:221-231.

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: February 27, 2023.