Aglenchus

  

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Rev 09/11/2023

  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  
          Atylenchinae

           Aglenchus Andrassy, 1954

Type species of the genus: Aglenchus agricola Andrassy, 1954
    Synonyms:
      None.

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Morphology and Anatomy:

.

Siddiqi differentiated Aglenchus  from Tylenchus by its offset head, well-marked labial annules, prominent stylet knobs and lateral vulval flaps (Husseinvand et al., 2016).  However, the head is not offset in all species.

Species of Aglenchus appear quite similar to those of Allotylenchus; they differ in that species of Aglenchus have three lateral lines while those of Allotylenchus have two (Husseinvand et al., 2016).

Aglenchus differs from the genus Coslenchus in having a weakly striated cuticle, in lacking longitudinal curicular ridges, in having an anterorrly-curved vagina and in lacking a postvulval sac (Geraert, 2008).

  • The head is continuous or slightly offset from the body contour and weakly sclerotized. 
  • There are lprominent ateral vulval flaps in females and papilla-like structures at the cloacal opening of males.
  • Females are monovarial and prodelphic. There is no pustvulval sac
  • Males are generally less common than females and slimmer


    Refer to subfamily diagnosis (Atylenchinae).

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

 

Key to the species of Aglenchus (from Husseinvand et al (2016)

1.  Short post utyerine sac present; stylet < 9 µm.......................................................................................A. microstylus

      Post-uterine sac absent;  stylet > 9 µm..................................................................................................2

2.  Stylet 13.5-16.5 µm.............................................................................................................................3

      Stylet 9-13 µm.....................................................................................................................................4

3.  Pharynx length 119 µm.........................................................................................................................A. siddiqii.

     Pharynx length 71-77 µm.....................................................................................................................A. andrassayi.

4.  Tail length 79-107 µm., stylet length 9-11 µm........................................................................................A. dakotensis

     Tail length 96-136 µm., stylet length 10.5-12 µm...................................................................................A. mardanensis

     Tail length 114-179 µm., stylet length 11-13 µm....................................................................................A. agricola

     Tail length 138-276 µm., stylet length 10.5-13 µm.................................................................................5

5.  Tail terminus finely rounded..................................................................................................................A. muktii

     Tail terminus hair-like to needle-like......................................................................................................6

6.  Median bulb 46-50%, c = 2.5-2.8, V=46-50%, V' = 74-79% ........................................................... A. ainakamurae

     Median bulb 52-56%, c = 2.9-3.4, V=52-56%, V' = 78-82%............................................................ A. geraerti

 

 

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Distribution:

 

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Economic Importance:

 

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Feeding:

 Yeates et al. (1993):  considered Aglenchus an epidermal cell and root feeder.     

But, Wood (1973) observed that Aglenchus newzealandicus fed on fungi although reproduction was not observed.

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

Husseinvand, M., Abdollahi, M., and Karegar, A. 2016. Description of Aglenchus microstylus n.sp. (Nematoda, Tylenchidae) from Iran with a modified key to the species of the genus. Nematropica 46:38-44.

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

Khera, S., Zuckermann, B.M. (1963), In vitro studies of host-parasite relationships of some plant-parasitic nematodes, Nematologica, 9, 1-6

Wood, F.H. 1973. Nematode feeding relationships: Feeding relationships of soil-dwelling nematodes. Soil Riol. Biochem. 5: 593-601.

Yeates, G.W., Bongers, T., Goede, R.G.M. de, Freckman, D.W., Georgieva, S.S. (1993a), 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 11, 2023.