CREPIDOSTOMUM-PERCOPSISI N. SP. (DIGENEA, ALLOCREADIIDAE) FROM THE TROUT PERCH (PERCOPSIS-OMISCOMAYCUS) OF DAUPHIN LAKE, CANADA

Crepidostomum percopsis n. sp. is described from the small intestine o f the trout perch (Percopsis omiscomaycus) in Dauphin Lake, Manitoba. It is morphologically similar to Crepidostomum isostomum, which has be en reported from the trout perch and several other species of fish. It differs from C. isostomum based on the vitellaria confined to the hin dbody of the worm, size and shape of the cirrus, size of the testes, a nd its greater body length. A comparison of our specimens with those i llustrated and identified as C. isostomum from trout perch indicates t hat such specimens are identical to larger specimens of C. percopsisi recovered by us from trout perch in May. To date, C. percopsisi has on ly been reported from the trout perch of Dauphin Lake, Lake Winnipeg, and Oneida Lake, which suggests host specificity.