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A redescription of Allassostomoides chelydrae and a review of the genus is presented, based on new collections of A. chelydrae and A. parvus from Nebraska, and examination of all type material relating to the genus. A. chelydrae, A. parvus, and A. louisianaensis are considered valid species. New host records for A. chelydrae are Bufo Americanus, Rana catesbeiana, Chrysemys picta, and Graptemys pseudogeographica. From March 1973 to October 1974, 40 specimens of digeneans belonging to the genus Allassostomoides Stunkard 1924 were collected from Rana catesbeiana, Chelydra serpentina, Chrysemys picta, and Graptemys pseudogeographica in Nebraska. The study of these specimens included a reexamination of all type material relating to the genus. Worms were removed from the host rectum, flattened with slight coverslip pressure, fixed with AFA, stored temporarily in 70% ethanol, stained with Mayer's hematoxylin, and mounted in Canada balsam for study as whole mounts. Representative specimens are on deposit with the Harold W. Manter Laboratory. All measurements are in microns unless otherwise

A Review of the Genus Allassostomoides Stunkard 1924 (Trematoda: Paramphistomidae) with a Redescription of A. chelydrae (Maccallum 1919) Yamaguti 1958