Rev 09/22/2022

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                     Seleborca  Andrassy, 1985


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Morphology and Anatomy:

Andrassy (1985) separated Seleborca from Acrobeles  mainly by the presence of a double cuticle and a lateral field with four incisures, two simple outer and two crenate or wavy inner lines.  Some authors have accepted Seleborca as a valid genus separate from Acrobeles, others have synonymized it with Acrobeles

Distinguishing character istics separating Seleborca and Acrobeles as described by Andrassy (1985) are:
(1) Cuticle double, outer layer thinner and inner layer thicker, heavily annulated in Seleborca; cuticle single in Acrobeles.
(2) Cuticle  structure  in Seleborca simple, rarely punctated, never divided into blocks by longitudinal striae. Cuticle in Acrobeles often
ornamented, simple or rarely divided into blocks by longitudInal lines.
(3) Lateral field in Seleborca with four incisures, two simple outer lines and two corrugated wavy inner lines; in Acrobeles there are two or
three incisures, the outer lines simple or slightly crenate.
Head structures and other morphological characters are similar in both genera.
Ref: Rashid et al, 1990.

Note that Shahina and De Ley (1997) argued that the double cuticle condition in these nematodes must have arisen in at least three lineages and therefore is not a sufficient criterion for separating genera.  Consequently they synonymized Seleborca and Acrobeles


Head and probollae of Seleborca welwitschiae

Photogtaph from Rashid et al., 1990


Body size range for the species of this genus in the database - Click:
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Preavalent in dry sandy soils.  Several species reported from desert conditions.

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  Bacterial feeding.

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Biology and Ecology:

The double cuticle may provide protection from parasites and predators,.

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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. 1985. A dozen new nematode species from Hungary.Opuscula Zoologica, Budapest. 19: 3-39.

Andrassy, I. 2005. Free-living Nematodes of Hungary Vol. 1. Hungarian Natural History Museum, Budapest.

Nadler, S.A., DeLey, P.,Mundo-Ocampo, M., Smythe, A.B.,Stock, S.P., Bumbarger, D., Adams, B.J., Tandingan De Ley, I., Holovachov, O., Baldwin, J.G. 2006. Phylogeny of Cephalobina (Nematoda): Molecular evidence for recurrent evolution of probolae and incongruence with traditional classifications. Molecular Phylogenetics and Evolution. 40: 696-711.

Rashid, F., J. Heyns, A. Coomans. 1990.  Species of Seleborca Andrassy, 1985 from South West Africa/Namibia (Nematoda: Cephalobidae). Phytophylactica 22:51-62.

Shahina, F., and De Ley, P. 1997. Two new species of Cephalobidae from Valle de la Luna, Argentina, and observations on the genera Acrobeles and Nothacrobeles (Nematoda: Rhabditida). Fundamental and Applied Nematology 20: 329-347.


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Copyright © 1999 by Howard Ferris..
Revised: September 22, 2022.