Ottolenchus   

  

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Rev 12/17/2023

  Classification Hosts
Morphology and Anatomy Life Cycle

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 Economic Importance Damage
Distribution Management
Return to Tylenchidae Menu Feeding  References
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Classification:

    Tylenchida
       Tylenchina
        Tylenchoidea
         Tylenchidae 
          Tylenchinae

           Ottolenchus (Husain & Khan, 1967) Wu. 1970

Type species of the genus: Ottolenchus equisetus Husain & Khan, 1967

    Synonyms:
     

Note:  Ottolenchus was erected by  Husain and Khan, 1967 as a subgenus of Tylenchus and it was raised to genus rank by Wu (1970).. but Geraert and Raski (1987) considered that the number of lateral lines is an unreliable character for generic differentiation and synonymized Ottolenchus with Filenchus. However, Siddiqi and Lal (1992) considered Ottolenchus a valid taxon based on the longitudinal, curved and sigmoid amphidial apertures that originate near the lateral lips and extend over most of the lip region, and the narrow lateral field with two incisures. Other authors appear to have agreed with the genus designation (Qing and Bert, 2017; Hosseinvand et al., 2021; Mahboubi et al., 2023).  

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Morphology and Anatomy.

.
  • Small nematodes
  • Body annulation generally coarse.
  • Head rounded with a slight depression at the base of lip region, without clear annulations
  • Lateral field with two incisures.
  • En face view rectangular in shape with four lips, two subdorsal and two subventral. Lateral lip regions in the form of two depressed areas.

Female:

  • Monodelphic-prodelphic
  • Rudimentary membrane of vulva present or not distinct.

Male:

  • Monorchic, testis outstretched
  • Bursa crenate
  • Spicules and gubernaculum tylenchoid.
  • Tail long and filiform with acute terminus which is often recurved.

Ref: Wu, 1970; Husain and Khan, 1967
Ottolenchus equisetum: A: female anterior; B: Lateral field; C: Female tail; D: Male tail
from Husain and Khan, 1967		  

 

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

 

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Economic Importance:

Probably fairly small.   

 

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Feeding:

Root associates; probably feeding on thin-walled epidermal cells and root hairs.

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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:

Geraert, E., and Raski, D. J. 1987. A reappraisal ofTylenchina (Nemata). 3. The family Tylenchidae Oerley,1880. Revue de Nématologie 10:143-161

Hosseinvand, M., Eskandari, A., Abolafia, J.,Karegar, A., Ghaderi, R., Majd Taheri, Z., and Hajializadeh, P. 2021. Ottolenchus sinipersici n.sp. (Rhabditida: Tylenchidae) from the Persian Gulfmangrove forests, Iran. Nematology 0:1-15.

Husain, S.I.  and Khan, A.M. 1967. A new subfamily, a new subgenus and eight new species of nematodes from India belonging to superfainily Tylenchoidea. Proc. Helminthol Soc. Washington 34:175-186.

Mahboubi, Z., Karamat, M., Pourjam, E., Atighi, M.R., Clavero-Camacho, I., Abolafia, J., Castillo, P., Pedram. M. 2023. Morphological and Molecular Characterization of Ottolenchus isfahanicus n. sp. (Tylenchomorpha:Tylenchoidea) from Rhizosphere of Gramineous Plants in Isfahan Province, Iran. J. Nematology 55: | DOI: 10.2478/jofnem-2023-0011

Qing, X., and Bert, W. 2017. Redefinition of genus Malenchus Andrassy, 1968 (Tylenchomorpha:Tylenchidae) with additional data on ecology. Journal of Nematology 49:189–206

Siddiqi, M. R., and Lal, A. 1992. Taxonomy of thegenus Ottolenchus Husain and Khan, 1967 (Nematoda:Tylenchidae) with descriptions of fifteen new species.Afro-Asian Journal of Nematology 2:89–106.

Wu, L.-Y. 1970. Genus Ottolenchus n. rank and Ottolenchus sulcus n. sp. (Tylenchidae: Nematoda) Canadian J. Zoology 48:249-251

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

 

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Copyright © 1999 by Howard Ferris.
Revised: December 17, 2023.