On the morphology and life history of stephanostomum caducum trematoda acanthocolpidae

Koie, M.

Ophelia 17(1): 121-134


ISSN/ISBN: 0078-5326
Accession: 006029071

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The cercaria of S. caducum develops in redia in the marine prosobranch Natica alderi. The ocelate cercaria has 2 alternating rows of oral spines and a stylet. The distal part of the tail is able to invaginate and function as a sucker. The cercaria is probably identical with Cercaria obtusicaudata Pelseneer 1906. The cercariae encyst below the epidermis of the mouth of fish belonging to the family Gobiidae. The metacercariae have 24 or 25 oral spines in each of the 2 rows. S. caducum developed in the pyloric caeca of cods fed on experimentally infected gobies. Cod Gadus morhua is the natural final host for S. caducum in Danish waters. The different developmental stages were studied using the scanning EM.