ASCAROID NEMATODES FROM CANADIAN BIRDS

Abstract

Thirteen species of nematodes belonging to the superfamily Ascaroidea are recorded from birds from Canada. Of these, Porrocaecum trichuriforme, Contracaecum anasi, and Heterakis pedioecetes are described as new: Contracaecum yamaguti is a new name for Contracaecum sp. Yamaguti, 1941. Several stages in the life cycle of P. ensicaudatum are described and Spiroptera turdi Molin is regarded as a larval stage of this species.