Family Strongyloididae


  •                 Strongyloididae Chitwood & McIintosh, 1934
  • A family reported as parasites of a wide variety of mammals.
  • Per Chitwood and Chitwood, 1950:
  • Free-living Generation:
  • Oral opening guarded by two lateral cephalic lobes.
  • Esophagus with corpus, isthmus, and valved bulb.
  • Female with two divergent uteri, ovaries reflexed; vulva near middle of body.
  • Male with one testis, equal spicules, a gubernaculum, and patterned genital papillae.
  • Caudal alae absent.
  • Parthenogenetic or sexually reproducing.
  • Filariform.
  • Stoma cup-shaped or greatly reduced.
  • Esophagus greatly elongate.
  • Reproductive systems in females and males (when present) similar to that of free-living generation.
  • Live in gastrointestinal tract of most vertebrates.
  • The family differs from the Rhabdiasidae in the superfamily Stongyloidoidea in that in the Rhabdiiasidae parasitic forms are relatively short and stout and are parasites of the lungs of reptiles and amphibians (Little, 1966).
  • Of the two genera in the family, Srongyloides and Parastrongyloides differ in that in the parasitic form, the former eare the only genera of this family and they differ in that the para- sitic form of the former is parthenogenetic and that of the latter is sexually reproducing and has a cup=shaped stoma. is dioecious and has a cup-shaped, thick-walled stoma



    DeLey, P., I.T. DeLey, M. Mundo-Ocampo. 1998. Nematode Workshop: Identification of free-living Chromadorea
    .  Department of Nematology, UC Riverside.

    Little, M.D. 1966. Comparative morphologhy of six species of Strongyloides (Nematoda) and redefinition of the genus. J. Parasitol. 52:69-84.


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