Rhodolaimus dimorphus

 

Contents

 

Rev 02/21/2024

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

Rhabditida
       Tylenchina
        Bunonematoidea
          BunonematdaeBunonematdae

           Rhodolaimus dimorphus Bernard, 1979

Synonym:

 

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Morphology and Anatomy:

 

 

 

  • Relatively slender Bunonematidae, characterized on the right side by about 35 tubercles arranged in two rows and obliquely offset and 1-2 midlateral tubercles anteriorly and posteriorly.
  • Tubercles of various sides depending partially on location on body: first tubercle usually large, hatchet-shaped, 2nd tubercle almost always reduced; these and remaining body tubercles bearing several embedded, fine rods. Polygonal network on right side fine, with five or more figures between tubercles; tiny protuberances which form polygon corners arising from body annules. Both tubercles and meshlike ornamentation easily abraded, apparently without immediate harm to the nematode.
  •  Lip region on right side with a triangular central projection, with a lobed seta on each side; this seta pectinate, with five inward-pointing bristles. Between central projection and each pectinate seta, a minute papilla; dorsally and ventrally, a smooth, pointed seta; on the left side, slightly thickened basal ridges, each bearing two setiform projections
  • Stoma cylindrical, only the cheilorhabdions separate; basal bulb with symmetrical crescent-shaped thickenings of the ventral and subdorsal rays; rods in the haustrulum slender.
  • Nerve ring crossing isthmus medially.
  • Excretory duct and pore at anterior level o£ basal bulb.

(xx for greater detail and drawings of cuticular ornamentation, see Bernar, 1979)

Female:

  • Stouter than male, tubercles usually larger.
  • Gonads paired, amphidelphic, reflexed; the unreflexed region serving as a combination uterus and spermatheca; sperms ameboid.

Male:

  • Right side of lip region prolonged as a large papilla which is lacking in the female .
  • Testis reflexed distally about one body width.
  • Bursa asymmetrical, well developed on left side, rudimentary on right. On left side, a preanal papilla and six bursal rays: one preanal, one anal, and four postanal; on right side, the same complement of papillae, except for absence of the anal papilla.
  • Tail tip with several pointed papillae.
  • Spicules slender, cephalated, and fused distally; troughlike gubernaculum slender except for hatchet-shaped terminus.

Ref: Bernard, 1979


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

 

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Distribution:

Originally collected from pine litter at the University of Georgia, Athens, Georgia.

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Feeding:

 Bacteria    

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Biology and Ecology:

   
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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:

Andrassy, I. 2005. Free-living Nematodes of Hungary, I (Nematoda errantia). Pedozoologica Hungarica 3. Hungarian Natural History Museum, Budapest, Hungary. 518p.

Bernard, E.C. 1979. New Species of Bunonematoidea (Rhabditida) from Georgia and Tennessee. J. Nematology 11:344-358.

Holovachov, O., Esquivel, A., and Bongers, T. 2003. Free-living nematodes from nature reserves in Costa Rica. 5. Bunonematoidea (Rhabditida). Nematology 5:665-676.

 

 

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Copyright © 1999 by Howard Ferris.
Revised: February 21, 2024.