Abstract
Gyrodactylus fryi n. sp. (Monogenea) is described from the body surface of Esox masquinongy Mitchill in Ontario. Gyrodactxlus fryi resembles most closely G. lingulatus Rogers, 1968 from the cyprinid Hypentelium etowanum (Jordan) in Alabama in having well-developed hamuli, a compact ventral bar with no anterolateral processes, a tongue-shaped ventral bar membrane, and a penis with small spines in two arched rows. Gyrodactylus fryi is easily distinguished from G. lingulatus by marginal hook size (11 to 14 μm long. 7 to 8 μm wide proximally, 14 to 16 μm wide distally) and shape (relatively small base with a long thin blade). Gyrodactylus fryi resembles at least nine other Gyrodactylus species known from cyprinid and catostomid fishes. The study concludes that a close ecological association between a piscivorous ancestral E. masquinongy and cyprinid and (or) catostomid fishes led eventually to evolutionary radiation of a gyrodactylid lineage from prey to predator.
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