Parasitorhabditis frontali

  

Contents

  

Rev 05/26/2023

  Classification Biology and Ecology
Morphology and Anatomy Life Cycle
Return to Parasitorhabditis Menu Ecosystem Functions and Services
Distribution Management
Return to Rhabditidae Menu Feeding  References
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Classification:

Chromadorea

  Rhabditia

    Rhabditida

      Rhabditoidea

        Rhabditidae

 

        Parasitorhabditis frontali Carta, Bauchan, Hsu & Yuceer, 2010

Synonyms

 

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Morphology and Anatomy:

  Male:

  • Stoma and phrynx as in female.
  • Testis extends up to 2/3 of body length, with packed hexagonal sperm diameter of 7 mm. Lateral field extends down to about the third annule of bursal fan.
  • Spiculewith nearly straight to minimally curved axis and very short distal fusion near acute, bluntly rounded tip, not curved\.
  •  Gubernaculum slipper-shaped with posterior lateral thickening
  • Open peloderan tail with bursal fan with 2 + (3+2) + 3 typical ray pattern, with rays 1 and 2 preanal, rays 3, 6 and 9 retracted from edge of fan and opening dorsally, 6 generally thickened at base, and 10 extending to edge of fan
  • Body plump with relatively steep angle from region of stoma to pharynx, with posture sinusoidal to ( straight when dead.
  • Papillar phasmids at ventral junction of tail body and bursal fan (
  •  Interval between major annules 1.5 mm above tail .

Female:

  • Stoma with a single small thin tooth
  • No stomatal collaret, glottoid apparatus nor punctations on cuticle of head region.
  • Pseudolips of six sectors with apical, labial papillae and cephalic papillae at base of lips,
  • Prominent annulations with 1.3 – 1.4 mm interval between head annules
  • Transverse ridging in lumen of procorpus, characteristic of genus.
  • Procorpus of pharynx procorpus with moderately  median bulb and isthmus about equal in length,
  •  Single anteriorly-directed gonad extends up to 2/3 body length, with prominent crustaformeria often c
  •  Vulva a transverse slit below, lips variably protruding.
  • Vagina short, oblique with muscular walls (
  • Tail cupola-shaped, with short spike often curled in live specimens

 

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

 

 
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Distribution:

Described associated with southern pine beetle Dendroctonus frontalis and its galleries in loblolly pine Pinus taeda growing in Mississippi, USA. It was determined to be a new species of Parasitorhabditis Fuchs, 1937, a genus of parasitic or phoretic nematodes associated with bark beetles.

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Feeding:

 

May feed on microbial flora in a biofilm on tree bark within beetle galleries.Nematodes in bark beetles often have complex trophic associations with fungi and other organisms.

Some species of Parasitorhabditis seem unable to grow on bacteria yet survive with a fungus (Carta et al., 2010).

 

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Biology and Ecology:

Nematodes of the genus Parasitorhabditis are considered to have either parasitic or phoretic associations with bark beetles; their effects on insect hosts are generally benign (Carta et al., 2010).

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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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Ecosystem Functions and Services:

 

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Management:

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References:

Carta, L.K., Bauchan, G., Hsu,C-Y,. Yuceer, C. 2010. Description of Parasitorhabditis frontali n. sp. (Nemata: Rhabditida) from Dendroctonus frontalis Zimmermann (Coleoptera: Scolytidae). J. Nematology 42:46-54

Sudhaus, W., Fitch, D. 2001. Comparative studies on the phylogeny and systematics of Rhabditidae (Nematoda). J. Nematology 33:1-70.
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Copyright 1999 by Howard Ferris.
Revised: May 26, 2023.

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