Discocriconemella

  

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   Rev 12/18/2023
  Classification Hosts
        Morphology and Anatomy Life Cycle
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Classification:

      Tylenchida
       Tylenchina
        Criconematoidea
         Criconematidae                                                                                                                    
          Discocriconemellinae

           Discocriconemella De Grisse and Loof, 1965     

Type species of the genus: Discocriconemella limitanea (Luc, 1959) De Grisse & Loof, 1965

    Synonyms:

      Neocriconema (Diab and Jenkins, 1965)
      Criconemoides (Andrassy, 1965)
      Criconemoides apud (Luc, 1970)
      Madinema (Khan, Chawla and Saha, 1976)
      Acrozostron (Orton Williams, 1981)

The genus Discocriconemella De Grisse & Loof, 1965 is characterised by the presence of a distinctly offset cephalic disc.

Vovlas (1992) divided  Discocriconemella species into four groups based on the configuration of the cephalic disc:

disc rounded with uninterrupted margins (group 1);

disc with ventral and dorsal deep indentations (group 2);

disc indentations giving a four-lobed appearance (group 3);

disc rounded with paired dorsal and ventral projections (group 4).

As of 2019, the genus contains 28 species (Maria et al., 2019). 

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Morphology and Anatomy:

Female: Body generally curved ventrally. Posterior edge of body annules smooth or finely crenate, never bearing scales or spines.

Photograph by R. Lopez, Nemapix.

Labial annule high, directed forward, forming a flattened disc, distinctly set off from second head annulus, often irregular (dorso-ventral and/or lateral indentations), and often constricted at its posterior part (sometimes described as a "neck" region).

Submedian lobes, when present, poorly developed.

Stylet of variable length, generally long, rigid or flexible. Anchor-shaped knobs.

Vulva usually closed, occasionally open.

Post-vulval part rounded to elongate-conoid.

 Male: Head end conoid, with an anterior projection. Lateral field variable (two or four lines); bursa present or not.

Juvenile: Annuli smooth to finely crenate, no longitudinal rows of scales or spines.

[Ref: Raski and Luc, (1987), Geraert (2010).]
 
Body size range for the species of this genus in the database - Click:
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Distribution:

 

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Economic Importance:

 

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Feeding:

      Feed ectoparasitically on root tips or along more mature roots.

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Hosts:
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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Damage:

 

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Management:

 

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References:

De Grisse, A. & Loof, P.A.A. (1965). Revision of the genus Criconemoides (Nematoda). Mededelingen Landbouwhogeschool en Opzoekingsstations Gent 30, 577-603.

Geraert, E. 2010. The Criconematidae of the World: Identification of the Family Criconematidae. Academia Press, Gent. 615p.

Maria, M.,  Cai, R., Subbotin, S.A. and Zheng, J. 2019. Description of Discocriconemella sinensis n. sp. (Nematoda: Criconematidae) from the rhizosphere of Camellia sinensis in China. Nematology 21: 779-792.

Raski, D.J. and Luc, M. 1987. A reappraisal of Tylenchina (Nematoda) 10. The superfamily Criconematoidea Taylor, 1936. Revue de Nematologie 10:409-444.

Vovlas, N. (1992). Taxonomy of Discocriconemella (Nematoda: Criconematoidea) with a redescription of D. mauritiensis. Journal of Nematology 24, 391-398.

 

 
Copyright © 1999 by Howard Ferris.
Revised: December 18, 2023.