Euryhelmis pacifica Senger and Macy, 1952

This trematode parasite was found in mink and muskrats in Oregon (Senger CM, Macy RW. 1952. helminths of northwest mammals. Part III. The description of Euryhelmispacificus n. sp., and notes on its life cycle. J Parasitol 38:481-486). The specimens were described as a new species due to their being pyriform rather than flat in shape. The difference is such that the species can easily be distinguished in mixed infections (Schell SC. 1964. Bunoderellametteri gen and sp. n. (Trematoda: Allocreadiidae) and other trematode parasites of Ascaphustruei Stejneger. J Parasitol 50:652-655). The metacercariae are found in the Pacific Giant Salamander, Dicamptodon ensatus, and in the tailed frog, Ascaphus truei. When metacercariae from the frogs were fed to cats, they were found to harbor adult specimens of this fluke 30 days after infection.