Family Strongyloididae

                                 Revised 01/26/26

Classification:

Phylum Nematoda

  Class Chromadorea

    Subclass Chromadoria

Order Rhabditida

Suborder Tylenchina

Superfamily Strongyloidoidea

            Strongyloididae Chitwood & McIintosh, 1934

 

A family reported as parasites of a wide variety of mammals.

Characteristics 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 Strongylaididae 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).

    • The two genera in the Strongyloididae, Srongyloides and Parastrongyloides, differ in the that the parasitic form of Strongyloides is parthenogenetic and has a cup-shaped stoma while Parastrongyloides is sexually reproducing  has a cup-shaped, thick-walled stoma


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

    References

    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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