Scutylenchus quercinus  

 

Contents

 

Rev 09/07/2023

  Classification Hosts
Morphology and Anatomy Life Cycle

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

Rhabditida
       Tylenchina
        Tylenchoidea
           Merliniidae
             Merliniinae

          
          Scutylenchus quercinus Sheikhzadeh, Mobasseri, Valizadeh, & Pedram, 2022

Synonyms

The Scutylenchus is currently considered a valid genus (Hashemi and Karegar, 2018).

 

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Morphology and Anatomy:

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Female:

  • Body cylindrical
  • Cuticle with distinct annuli; lateral field with four incisures, forming three simple bands.  Deirids absent.
  • Cephalic region rounded at corners, 4-6 um high, 7-9 um wide, offset from body by constriction, with 5-6 striae; cephalic framework weakly sclerotised.
  • Stylet conus 50% ofstylet length and with posteriorly sloping basal knobs.
  • Dorsal gland orifice located about 1.8 um postarior to stylet knobs. Procorpus slender, median bulb ellipsoid, with prominent valve plates, isthmus narrower than procorpus, pharyngeal bulb saccate and offset from intestine. Cardia small.
  • Nerve ring at mid-isthmus level.
  • Secretoryexcretory pore at level of anterior of pharyngeal bulb
  •  Hemizonid located one annulus anterior to excretory pore.
  • Didelphic-amphidelphic, both branches equally developed.
  • Ovaries outstretched, oviduct slender, spermatheca spheroid, filled with spheroid sperm
  • Vulva in a caviity, with epiptygma.
  •  Phasmids conspicuous, located 8-11 annuli posterior to anus
  • Tail subcylindrical with 14-18 annuli; tip smooth. .

Male: 

  • Abundant
  • General morphology similat to female except tail shape.
  • No sexual dimorphism in anterior region. Spicules paired, slender, slightly ventrally curved.
  • Gubernaculum crescent shaped.
  • Bursa with finely crenate margin, reaching tail terminus


Ref: Sheikhzadeh et al., 2022

 

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

 

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Distribution:

Species described from the rhizospher of Quercus sp. in natural Asalem forests, Gilan province, north Iran..


Economic Importance:

 

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Feeding:

  A migratory ectoparasite of plant roots.

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Hosts:

For an extensive host range list for this species, click

 


 
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Life Cycle:

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:

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

Sheikhzadeh, S., Mobasseri, M., Valizadeh, A., Pedram, M. 2022. Description of Scutylenchus quercinus n.sp. (Nematode: Tylenchomorpha) from Asalem forests, north Iran. Nematology 24:531-542.

Siddiqi, M.R. (2000). Tylenchida: parasites of plants and insects, 2nd edition. Wallingford, UK, CAB International

 

 

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Copyright © 1999 by Howard Ferris.
Revised: September 07, 2023.