Abstract
ABSTRACT: Salsuginus thalkeni n. sp. (Monogenea: Ancyrocephalidae) is described from the gills ofthe plainskillifish, Fundulus zebrinus, in the South Platte River ofNebraska. Salsuginus thalkeni is distinguished frompreviously described species by measurements ofsclerotized parts and by proportions (measurement ratios),differences between dorsal and ventral hamuli, and angles between deep and superficial hamulus roots. A number ofpapers have reported ecologicalobservationsona monogeneanparasitizing Fundulus zebrinus Garman (=Fundulus kansae) inthe South Platte RiverofNebraska. This speciesofhelminth has been cal1ed Urocleidus fundulus by Adams (1985, 1986) and Janovy andHardin(1987), and Salsuginus sp. byJanovyandHardin (1988). A thorough study ofthe ancyrocephalid monogeneans parasitizing Fundulus species was presented by Murith and BeverleyBurton (1985), who reviewed and evaluatedtaxonomiccharacters, synonymized some ofthehelminth species, assigned themal1 to the genus
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