Rev 09/12/2023

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           Coslenchus Siddiqi, 1978

Type species ofg the genus: Coslenchus costatus (de Man, 1921) Siffiqi, 1978

      Cosaglenchus (Siddiqui & Khan, 1983)
      Paktylenchus (Maqbool, 1983)

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Morphology and Anatomy:

 Coslenchus differs from the genus Aglenchus in having a strongly-striated cuticle with longitudinal curicular ridges and in having a postvulval sac (Geraert, 2008).

Longitudinal ridges in cuticle

  • Body cuticle coarsely annulated and with longitudinal ridges
  • Labial plate dumbbell-shaped
  • Round, pore-like amphid apertures not extending on lateral sides of cephalic region.
  • Vulva with thick lips and lateral membranes in females.
  • Cloacal lips forming a short tube in males.

Refer to subfamily diagnosis (Atylenchinae).

Body size range for the species of this genus in the database - Click:

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The type species of the genus, C. costatus (de Man, 1921) Siddiqi, 1978 was described from specimens obtained from moist soil around plant roots on the bank of the River Mark in Breda, the Netherlands (Hosseinvand et al., 2019).

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Economic Importance:


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Yeates et al. (1993) considered Coslenchus: (epidermal cell and root feeders).

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For an extensive host range list for this genus, click
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Life Cycle:

For Ecophysiological Parameters for this genus, click 
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Baujard, P. (1995), Laboratory methods used for the study of the ecology and pathogenicity of Tylenchida, Longidoridae and Trichodoridae from rainy and semi-arid tropics of West Africa, Fundamental and Applied Nematology, 18, 63-66

Cobb, N.A. (1925), Biological relationships of the mathematical series 1, 2, 4, etc., Chapter 15 in: Contributions to a Science of Nematology,

Geraert, E. 2008. The Tylenchidae of the World - Identification of the family Tylenchidae (Nematoda). Gent, Academia Press 540p.

Hosseinvand. M., Eskandari, A., Ghaderi, R. 2019. Morphological and Molecular Characterization of Coslenchus paramaritus n. sp. and C. cancellatus (Cobb, 1925) Siddiqi, 1978 (Nematoda: Tylenchidae) from Iran. J. Nematology 51:  DOI: 10.21307/jofnem-2019-059 

Khera, S., Zuckermann, B.M. (1962), Studies on the culturing of certain ectoparasitic nematodes on plant callus tissue, Nematologica, 8, 272-274

Siddiqi, M.R. 2000. Tylenchida, Parasites of Plants and Insects, 2nd ed. Wallingford, UK: CAB International, 833 pp.

Thorne, G. (1961), Tylenchinae, chapter 5 in: Principles of Nematology, McGraw-Hill Book Company Inc., New York - Toronto - London, 553 pp.

Wood, F.H. (1971), Studies on the biology of soil-dwelling nematodes from tussock grassland, Ph.D. thesis, University of Canterbury, New Zealand, 286 pp.

Wood, F.H. (1973a), Life cycle and host-parasite relationships of Aglenchus costatus (de Man, 1921) Meyl, 1961 (Nematoda, Tylenchidae), New Zealand Journal of Agricultural Research, 16, 373-380

Wood, F.H. (1973b), Nematode feeding relationships, feeding relationships of soil-dwelling nematodes, Soil Biology and Biochemistry, 5, 593-601

Yeates, G.W., Bongers, T., Goede, R.G.M. de, Freckman, D.W., Georgieva, S.S. (1993), Feeding habits in soil nematode families and genera - an outline for soil ecologists, Journal of Nematology, 25 (3): 315-331


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Copyright © 1999 by Howard Ferris.
Revised: September 12, 2023.