Halenchus

  

Contents

  

Rev 09/13/2023
  Classification Hosts
Morphology and Anatomy Life Cycle
Return to Halenchus Menu Economic Importance Damage
Distribution Management
Return to Anguinidae Menu Feeding  References
    Go to Nemaplex Main Menu   Go to Dictionary of Terminology

Classification:

      Tylenchida
       Tylenchina
        Tylenchoidea
         Anguinidae

          Halenchus Cobb, 1933

Type species of the genus: Halenchus fucicola (de Man & Barton, 1892) Cobb, 1933

Cobb erected the genus Halenchus to accommodate Tylenchus fucicola de Man & Barton, 1892 and T. mediterranea Micoletzky, 1922 and designated Halenchus fucicola (de Man & Barton, 1892) Cobb, 1933 as type species of the new genus (Tarjan, 1957).

Barton (1892) described galls on seaweed (Ascophyllum nodosum) on the coast of Scotland. The galls contained numerous nematodes which were sent to J.G. de Man who described them as Tylenchus fucicola, the first known marine tylenchid (Coles, 1958).

Hirschmanniella mexicana and and H. zoostericola were once placed in Halenchus. However, Halenchus differs from Hirschmanniella by shape of labial area, stylet more slender, median bulb not well defined, monovarial female gonad, large sperms in tubular elongate spermatheca, and tail shape.

    Synonyms:
     

Back to Top

Morphology and Anatomy:

 
  • General characteristics of Anguinidae.
  • Labial region slightly offset and narrower than body.
  • Corpus without distinct median bulb, valveless.
  • Esophageal glands a long overlapping lobe.
  • Excretory duct wide.
  • Single ovary. Oocytes in one/two rows.
  • Caudal alae short, adanal.
  • Tail of both sexes with hooked tip.
 

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

Distribution:

Marine nematodes. Reported from coasts of Scotland, England, Norway and USA (Coles, 1958).

The marine habitat of Halenchus is unique to Anguinidae. In Tylenchina, only some Hirschmanniella spp. (Pratylenchidae) are known marine nematodes.

Back to Top

Economic Importance:

 

Back to Top

Feeding:

 

Back to Top

Hosts:

 Ascophylum, Fucus 
For an extensive host range list for this genus, click
Back to Top

Life Cycle:

For Ecophysiological Parameters for this genus, click 
 
Back to Top

Damage:

 

Back to Top

Management:

 

Back to Top

References:

Coles, J.W. 1958. Nematodes parasitic on sea weeds of the genera Ascophyllum and Fucus. J. Marine Biol. Assoc. UK 37:145-155

Tarjan, A.C. 1957. An emended description of the marine nematode genus Halenchus Cobb, 1933 (Tylenchinae) Quarterly J. Florida Acad Sci. 20:121-125.
Back to Top
Copyright © 1999 by Howard Ferris.
Revised: September 13, 2023.