Abstract
Three adult lesser " scaup ducks, Aythya affinis, collected at Amchitka Island, Alaska, were heavily parasitized with the 5 following spp. of cestodes Diorchis acuminata, Fimbriaria fasciolaris, Hymenolepls arcuata, Hymenolepis macracantha; and Hymenolepis echinorostrae which is described and differentiated from several other morphologically similar species.

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