Aquatic Parasite Observatory

Choledocystus sp. (Pereira & Cuocolo, 1941)

    • Species Name: Choledocystus sp. (Pereira & Cuocolo, 1941)
    • Synonyms: None
    • Taxonomy: (Pereira & Cuocolo, 1941) Animalia, Platyhelminthes, Trematoda, Plagiorchiida, Plagiorchiidae, Choledocystus sp.
    • Description: "Body rounded-oval to fusiform. Tegument spined. Oral sucker subterminal, larger than or equal to ventral sucker. Ventral sucker closely pre-equatorial. Prepharynx indistinct. Pharynx well developed. Oesophagus short. Intestinal bifurcation in mid-forebody. Caeca extend to near posterior extremity. Testes entire, more or less roundd, arranged symmetrically or somewhat obliquely in middle of body. Cirrus-sac relatively large, arcuate; contains bipartite seminal vesicle, well-developed pars prostatica and unarmed cirrus. Genital pore submedian, close to intestinal bifurcation. Ovary submedian, immediately posterior to ventral sucker. Seminal receptacle absent. Vitelline follicles lateral to intestinal caeca or partly overlap them, extend from intestinal bifurcation to level margins of testes or caecal ends. Excretory vesicle more or less Y-shaped, with very short limbs. In gall-bladder, bile-ducts and liver of anuran amphibians; neotropics. Type species C. elegans (Travassos, 1926) Pereira & Cuocolo, 1941" (Bray et al., 2008).
    • Life Cycle: "Some species of Choledocystus use physa snails as first intermediate hosts, amphibians as second intermediate host, and amphibians as the definitive host. The definitive hosts are infected through eating the sloughed skin of the frog, which contains metacercariae" (Sullivan and Byrd, 1970).
    • Sources: Bray, R.A., Gibson D.I., and Jones, A. 2008. Keys to the Trematoda, Vol. 3, p. 317.
    • Sullivan, J.J. and Byrd, E.E. 1970. Choledocystus pennsylvaniensis: Life History. Transactions of the American Microscopical Society, Vol. 89, No. 3, p. 384-396. Published by Wiley on behalf of American Microscopical Society http://www.jstor.org/stable/3224358 Accessed: 20-01-2016 00:18 UTC.
    • APO Parasite Records: (by Life Cycle)

Parasite Images:


  • University of Colorado Boulder