Parastrongyloides

  

Contents

  

Rev 03/14/2025

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

Chromadorea

  Rhabditia

    Rhabditida

Tylenchina

      Strongyloidoidea

        Strongyloididae

       
Parastrongyloides Morgan, 1928

Type species of the genus: Parastrongyloides winchesi Morgan, 1928

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Morphology and Anatomy:

A genus of animal-parasitic nematodes that, unusually, has a free-living adult generation.

Parastrongyloides trichosuri  (b) free-living adult male, bar 100 um; (c) free-living adult female, bar 100 um; (d) infective larva, bar 100 um; (e) parasitic adults, male at the top, female at the bottom, bar 1 mm.
from Grant et al. 2006

 

Males:

Free-living Male:

Female:

Free-living Female:

Parasitic Female:

Ref:
   

Body size range for the species of this genus in the database - Click:
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Distribution:

 

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Feeding:

A genus of animal-parasitic nematodes that, unusually, has a free-living adult generation that feeds, presumably, on microbes..

 

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Biology and Ecology:

Parastrongyloides trichosuri is an intestinal parasite of Australian Brush-tailed possums.

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Life Cycle:

Parastrongyloides trichosur has the ability to complete multiple reproductive cycles in a free-living condition. That increases the numbers of its infective third stage juvweniles in feces of the definitive host and therefore its inoculum potential as a perasite (Grant at al., 2006).



Free-living and parasitic life cycles of Parastrongyloides tricosuri
from Grant et al., 2006
The infective larvae of P. trichosuri penetrate the skin of the possum host and arrive in the lungs within 2�3 days, from where 20�30% of the inoculating dose can be recovered. Somewhat less (10�20% of the inoculating dose) can be recovered from the gut approximately 5�7 days p.i. (Crook et al., 2005). The adult male and female parasites are usually located in the anterior half of the small intestine in loose association with the mucosal surface from which they are easily recovered with gentle scraping.
Parasitic adults differ in size and morphology from the freeliving adults.  Eggs are passed fully embryonated and hatch in less than 24 h at temperatures >15C. There is no evidence of hatching or larval development of worms in feces dissected from the bowel before being passed (Grant et al., 2006)..

For Ecophysiological Parameters for this genus, click 
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Ecosystem Functions and Services:

 

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Management:

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References:

Crook, M., Thompson, F.J., Grant, W.N., Viney, M.E., 2005. daf-7 and the development of Strongyloides ratti and Parastrongyloides trichosuri. Mol. Biochem. Parasitol. 139: 213-221.

Grant, W.N., Stasiuk, S., Newton-Howes, J., Ralston, M., Bisset, S.A., Heath, D.D., Shoemaker, C.N. 2006. Parastrongyloides trichosuri, a nematode parasite of mammals that is uniquely suited to genetic analysis. Int. J. Parasitol. 36:453-466.

Morgan. D.O. 1928.  Parastrongyloides winchesi gen. et. sp. nov. A remarkable new Nematode parasite of the mole and the shrew. J. Helminthology 6:79-86.

Spratt, D.M. 2018. A review of species of Parastrongyloides (Nematoda: Rhabditoidea: Strongyloididae) from Australian marsupials with descriptions of three new species. Transactions of the Royal Society of South Australia 142: 162-182

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Copyright 1999 by Howard Ferris.
Revised: March 14, 2025.

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