Tylenchorhynchus

 

Contents

 

Rev 06/24/2014

Stylet or Stunt nematodes Classification Hosts
Morphology and Anatomy Life Cycle
Return to Tylenchorhynchus Menu Economic Importance Damage
Distribution Management
Return to Dolichodoridae Menu Feeding  References
         

      
      Classification:

     

Rhabditida
       Tylenchina
        Tylenchoidea
           Dolichodoridae
             Telotylenchinae


           Tylenchorhynchus (Cobb, 1913)

    Synonyms:
      Bitylenchus (Filip'ev, 1934)
      Telotylenchus (Siddiqi, 1960)
      Quinisulcius (Siddiqi, 1971)
      Dolichorhynchus (Mulk and Jairajpuri, 1974)
      Trilineellus (Lewis and Golden, 1981)
      Divittus (Jairajpuri, 1984)
      Morasinema (Javed, 1984)
      Tessellus (Jairajpuri and Hunt, 1984) 
      Neodolichorhynchus (Jairajpuri and Hunt, 1984)

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Morphology and Anatomy:

 

 

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Female and male of Tylenchorhynchus. 

Photograph by Jon Eisenback, Nemapix.

 

General Characteristics

  •  Body medium-sized.  
  • Cephalic framework slight to heavily sclerotized. 
  • Phasmids prominent.  
  • Lateral field with two, three, four, or five lines, sometimes areolated.  Longitudinal ridges sometimes present on body.  
  • Tail conoid to subcylindroid, about three times as long as wide (c' = 2 to 4), sometimes with thicker cuticle in the distal portion.  
  • SEM face view typically with labial disc fused with first lip annule, and with lateral sectors regressed.  The remaining sub-median sectors give a distinctive quadrangular appearance to the face view.  Papillae often present on submedian sectors.  Head continuous to slightly offset. 
  • Stylet 15 to 30 m long, thin to slender, has strong knobs, with cone about as long as shaft, sometimes needle-like.  
  • Esophageal glands bound by a membrane into a large basal bulb. Appear to butt into intestine. 
  • Deirids often absent.

Females:

  • Diovarial, amphidelphic, ovaries outstretched, vulva about 50%.
  • Tail round.

Males:

Note also Merlinius, Quinisulcius = (Tylenchorhynchus) etc.

 [Ref: Fortuner & Luc (1987), and H. Ferris.]

 

Drawings by Thorne and Malek, 1968; photographs by Peter Mullin (UNL), 2000.


Photograph by Howard Ferris
Tylenchorhynchus sp. from organic vegetable system, Salinas, California
Genus monographed by Allen in 1955 - 34 species, 22 new species, 12 old or already described.  In 1962, A.D. Baker listed 55 species.  Sher listed over 100 species (200 in family and subfamily).

Several related genera are differentiated on the following characters:

1. Number of lateral lines; 
2. Annulation of cuticle;
3. Shape of lip region and number of annules;
4. Length of spear;
5. Shape and length of female tail;
6. Position of hemizonid.

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Distribution:

Widely distributed - almost any collection will usually contain from one to four species.

Over 100 species of stunt nematodes have been described.

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Economic Importance:

D-rated pests in California.

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Feeding:

Generally true ectoparasites on epidermal cells and root hairs, but capable of endoparasitic feeding on some hosts.     

Feeding structure and function in Tylenchorhynchus.  Configuration of dorsal and subventral esophageal glands (right); dorsal esophageal gland opening and stylets (top left); metacorpus (bottom left.

Diagram from Urs Wyss, Nemapix.

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Hosts:

 

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

Tylenchorhynchus

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

  
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Life Cycle:

 

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Damage:

 

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Management:

 

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References:

Fortuner & Luc, Rev. Nematol. 10:183-202 (1987)

Geraert, E. 2011.  The Dolichodoridae of the World.  Academia Press, Gent 520p

H. Ferris.

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Copyright 1999 by Howard Ferris.
Revised: June 24, 2014.