Rotylenchus

 

Contents

 

Rev 12/27/2013

 spiral nematodes Classification Hosts
Morphology and Anatomy Life Cycle
Return to Rotylenchus Menu Economic Importance Damage
Distribution Management
Return to Hoplolaimidae Menu Feeding  References
         

 Classification:

      Tylenchina
       Tylenchoidea
        Hoplolaimidae
         Hoplolaiminae
          Rotylenchus (Filip'ev, 1936)

    Synonyms:
      Anguillulina (Rotylenchus) (Filip'ev, 1936)
      Gottholdsteineria (Andrássy, 1958)
      Orientylus (Jairajpuri and Siddiqi, 1977)   
      Calvatylus (Jairajpuri and Siddiqi, 1977)
      Interrotylenchus (Eroshenko, 1984)
      Scutellonemoides (Eroshenko, 1984)
      Varotylus (Siddiqi, 1986)

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Morphology and Anatomy:

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Female:  Body spiral to C-shaped.  

Labial region offset or continuous with body contours, anteriorly rounded or flattened, generally annulated, with or without longitudinal striae on basal lip annule.  

Lateral field with four lines, with or without scattered transverse striae.  

Labial framework, stylet, and stylet knobs average-sized for the family; knobs with rounded to indented anterior surface.

Dorsal esophageal gland opening often close to stylet (6 µm), but with tendency to posteriorly directed migration (up to 16 µm).  

Esophageal glands overlap intestine dorsally and laterally; dorsal gland more developed than subventral glands; intestine symmetrically arranged between the subventral glands.  

Two genital branches outstretched, equally developed; posterior branch rarely degenerated (diovarial, amphidelphic). 

Epiptygma (single or double) present.  

Tail short, hemispherical, rarely with small ventral projection.

Phasmids pore-like, small, near anus level.   (photomicrograph of Rotylenchus robustus from Half Moon Bay, California by I.A. Zasada)  

Males: Caudal alae enveloping tail (peloderan), not lobed.  (photomicrograph of caudal alae and spicules of Rotylenchus robustus from Half Moon Bay, California by I.A. Zasada). 

Secondary sexual dimorphism not marked; sometimes anterior part of male body slightly smaller than female.

[Ref: Fortuner, (1987).]

 

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Distribution:


Six species of Rotylenchinae were identified from 5,451 soil samples from throughout Great Britain. 

Pararoylenchus ouensensis was found only from Jersey, Channel Islands, Rotylenchus pumilis and R. buxophilus were mainly restricted to southern England.  

Rotylenchus uniformis, R. goodeyi and R. robustus were found in a wide range of soil types but R. robustus preferred more moist, alkaline soils and was recorded at greater altitudes then R. goodeyi  (Boag and Neilson, 1996).

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Economic Importance:

D-rated pests in California.

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Feeding:

      
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Hosts:

Roylenchus goodeyi was more often found associated with beech and Scots pine while R. robustus preferred bog myrtle, oak and hawthorn (Boag and Neilson, 1996).

For an extensive list of host plant species and their susceptibility to this genus, copy the genus name

Rotylenchus

select Nemabase Genus Search and paste the name in the Genus box

 

   
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Life Cycle:

At the population levels encountered there was no evidence of either inter- or intraspecific competition within or between either R. goodeyi or R. robustus  (Boag and Neilson, 1996).

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Damage:

 

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Management:

 

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References:

Boag, B.and R. Neilson.  1996.  Distribution and ecology of Rotylenchus and Pararotylenchus (Nematoda: Hoplolaimidae) in Great Britain. Nematologica 42: 96-108.

Fortuner, R. 1987.  Rev. Nematol. 10:219-232.

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Copyright © 1999 by Howard Ferris.
Revised: December 27, 2013.