Coslenchus		Contents		Rev 12/20/2024
		Classification		Hosts
		Morphology and Anatomy		Life Cycle
Return to Coslenchus Menu		Economic Importance		Damage
		Distribution		Management
Return to Tylenchidae Menu		Feeding		References
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Classification:

Chromadorea
       Rhabditida
       Tylenchina
        Tylenchoidea
         Tylenchidae
          Atylenchinae 

           Coslenchus Siddiqi, 1978

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

    Synonyms:
      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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Distribution:

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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Feeding:

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

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Hosts:

• Baujard (1995):  Coslenchus franklinae was cultured in the laboratory, but on what medium or plant is not clear.
• Khera and Zuckermann (1962):  Aglenchus costatus ( = Coslenchus costatus) propagated rapidly on alfalfa callus tissue at 23C, but it failed to propagate on other tissue cultures (tomato, broccoli, carrot, cabbage, rye and corn).
• Thorne (1961):  Coslenchus cancellatus was found infesting roots of peony on which they caused gall-like swellings. 
• Cobb (1925) observed this, but he failed to record the source of his material.
• Wood (1971):  Coslenchus costatus was observed feeding and reproducing on seedlings (fescue tussock and rye grass), on lucerne callus tissue, on fungi (Phoma sp., Rhizoctonia solani and Ulocladium atrum), and on mosses (Tortula princeps and Bryum sp.).  
• Wood (1973a):  Coslenchus costatus was observed feeding and reproducing on seedlings of fescue tussock and rye grass, on alfalfa callus tissue and moss (Tortula princeps and Bryum sp.). It was observed feeding on fungi, but it was only in two occasions for a short time.
• Wood (1973b):  Coslenchus costatus was observed feeding ectoparasitically on root hairs, epidermal root cells and occasionally on sloughed root-cap cells of rye grass seedlings growing in agar. It was observed feeding on seedlings of white clover, suckling clover, rye grass, crested dogstail, Yorkshire fog, timothy, goosegrass, sweet vernal, browntop, cocksfoot, fescue tussock, chewings fescue.

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Life Cycle:

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Damage:

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Management:

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References:

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: December 20, 2024.