Notes on the Morphology and Host-Parasite Specificity of Fibricola cratera (Barker and Noll, 1915) Dubois 1932 (Trematoda: Diplostomatidae)

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Abstract
Diplostomula from pelvic musculature of Rana pipiens collected at the Iowa Lakeside Laboratory in n.-w. Iowa, and at Ames, Iowa, when fed to laboratory-reared white mice and chicks developed to sexually mature Fibricola cratera in the duodenum of these hosts. In white rats, only sexually immature worms were recovered. Details of the male and female repro-ductive systems of the parasite are presented. Serial sections of adults in situ indicate that nutrition of the parasite is both by diffusion through the holdfast and by ingestion of host tissue by way of the oral sucker and digestive tract. Development of mature worms in avian as well as in mammalian hosts suggests that host-specificity as a major taxonomic criterion for the separation of subfamilies of the Diplostomatidae is open to question.
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