US Fish & Wildlife Service


Date of this Version



Published in The Journal of Parasitology, Vol. 40, No. 2 (Apr., 1954), pp. 232-233


The metacercaria of Ornithodiplostomum ptychocheilush as been reported by Faust (1918; Illinois Biol. Monogr. 4 (1): 1-120) from mesenteries of the squawfish, Ptychocheilus oregonensis (Richardson), and by Hughes and Piszcek (1928; Jour. Parasit. 15: 58-62) and Van Haitsma (1930; Tr. Amer. Micr. Soc. 49: 140-153) in the northeastern sand shiner, Notropis deliciosus stramineus (Cope). Van Haitsma (1930) found the adults in mergansers, Mergus americanus, M. serrator, Lophodytes cucullatus, and the old squaw duck, Harelda hyemalis. He also reared the metacercaria to the adult in young domestic ducks. Lyster (1940; Can. J. Research 18D: 79-82) reported this worm as a cyathocotylid, Paracoenogonimus katsuradi n. sp., from L. cucullatus in Canada, but Dubois (1946; Ext. Actes Soc. Helvet. Sci. Nat. Zurich: 153-154) placed this name in synonymy with O. ptychocheilus