Bitylenchus ventrosignatus

  

Contents

  

Rev 06/14/2022

Stunt Nematode Classification Hosts
Morphology and Anatomy Life Cycle
Return to Bitylenchus Menu Economic Importance Damage
Distribution Management
Return to Telotylenchidae Menu Feeding  References
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Classification:

Rhabditida
       Tylenchina
        Tylenchoidea
           Telotylenchidae
             Telotylenchinae

Bitylenchus ventrosignatus (Tobs Jimenez, 1969) Siddiqi, 1986

Synonyms:

Tylenchorhynchus ventrosignatus Geraert, 2011

Tylenchorhynchus ventrosignatus  Tobar Jimenez, 1969



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Morphology and Anatomy:

 See genus description for general configuration.


 

 Reported median body size for this species (Length mm; width micrometers; weight micrograms) - Click:

 

Female

  • Body almost open C-shaped after heat relaxation, no longitudinal striae or ridges outside lateral fields.
  • Body annuli distinct but fine,
  • Lateral fields originating at the level of the conus of the stylet and extending up to hyaline region of tail to tail terminus, with four incisures, 13–26% of the corresponding body diameter.
  • Lip region high, spherical, offset from body contour,with four annuli.
  • Stoma with cheilostom (=conus) 52–54% of the stoma length, gymnostom (=almost part of the shaft) 38–40% of the stoma length, and prostegostom (=posterior part of the shaft and knobs) 8–9% of the stoma length.
  • Stylet moderately strong, conus slightly longer than shafte; knobs laterally to posteriorly directed.
  • DEGO 1.4-2.5 um behind stylet base.
  • Metacorpus rounded; postcorpus pyriform. Cardia well developed.
  • Vulva a transverse slit slightly posterior to the middle of the body, vagina without epiptygma.
  • Amphidelphic, didelphic; ovaries well developed. Spermatheca rounded, filled with rounded spermatozoa.
  • Tail subcylindrical, tail terminus rounded or conical and smooth. P
  • hasmids located slightly anterior to middle of the tail, 38-42% of tail length. Post-anal intestinal sac present.

 Male

  • Abundant, similar to the females morphologically,
  • Monorchic, testis outstretched anteriorly.
  • Spicules tylenchoid, paired and symmetrical,
  • Bursa large and conspicuous, extending to tail tip.
  •  Gubernaculum awell developed, curved, about 34-41% of the spicule length.
  • Tail terminus conoid and pointed.

Ref: Shokoohi, 2021
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Distribution:

Originally described from Spain, current description from specimens collected in the rhizosphaere of grasses in Botswana (Shokoohi, 2021).

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Economic Importance:


 

 

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Feeding:

Migratory ectoparasite


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Hosts:

Found in rhizosphere of grasses in Botswana.

For an extensive host range list for this species, click


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Life Cycle:

Amphimictic based on abundance of males and sperm in spermatheca.

Ecophysiological Parameters:

For Ecophysiological Parameters for this species, click If species level data are not available, click for genus level parameters
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Damage:

 

 

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Management:

Host Plant Resistance, Non-hosts and Crop Rotation alternatives:

For plants reported to have some level of resistance to this species, click

 

 
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References:

Andrassy, I. 2007. Free-living Nematodes of Hungary II.  Hungarian Natural History Museum, Budapest. 496p.

Geraert, E. 2011. The Dolichodoridae of the world, identification of the family Dolichodoridae (Nematoda: Tylenchida), Academia Press, Ghent, p. 520

Handoo, Z. A., Palomares-Rius, J. E., CantalapiedraNavarrete, C., Liébanas, G., Subbotin, S. A. and Castillo, P. 2014. Integrative taxonomy of the stunt nematodes of the genera Bitylenchus and Tylenchorhynchus (Nematoda, Telotylenchidae) with description of two new species and a molecular phylogeny. Zoological Journal of the Linnean Society 172:231–64, available at: https://doi.org/10.1111/zoj12175

Hosseinvand, M., Eskandari, A., Ganjkhanloo, S., Ghaderi, R., Castillo, P. and Palomares-Rius, J. E. 2020. Taxonomical considerations and molecular phylogeny of the closely related genera Bitylenchus, Sauertylenchus and Tylenchorhynchus (Nematoda: Telotylenchinae), with one new and four known species from Iran. Journal of Helminthology 94:1-25. doi. org/10.1017/S0022149X20000784.

Shokoohi, E. 2021. First report of Bitylenchus ventrosignatus (Tobar Jimï‚Žnez, 1969) Siddiqi, 1986 associated with wild grass in Botswana. J. Nematology 53: | DOI: 10.21307/jofnem-2021-037

Siddiqi, M. R. 1986. Tylenchida: parasites of plants and insects, Commonwealth Agricultural Bureaux, Farnham Royal, London, p. 645

Tobar Jiménez, A. 1969. Descripción del Tylenchorhynchus ventrosignatus sp. nov. (Nematoda: Tylenchida). Revista Ibérica de Parasitologia 29: 399–403.

 

 
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Copyright © 1999 by Howard Ferris.
Revised: June 14, 2022.