Abstract
During a parasite survey of northwest Wisconsin fishes Fischthal (1950) recorded a moderate infection (12 worms) of Macroderoides spiniferus occurring in the small intestine of the one muskellunge, Esox m. masquinongy, collected on August 1, 1945 from Teal Lake, Sawyer County. A re-study of this material through serial cross and frontal sections indicated that the previous identification was erroneous and that a new genus and species, Cestrahelnins laruei, of uncertain familial relationship is represented. The generic name (Gr. cestra, dart + helmins, worm) refers to the numerous spines on the body and in the cirrus and metraterm. The species is named in honor of Dr. George R. LaRue, my former professor and a consultant in the present study. All worms were fixed in Lavdowsky's AFA, stained in Harris' hematoxylin, and mounted in balsam. Appreciation is due Allen McIntosh, George R. LaRue and E. W. Price, Animal Disease and Parasite Research Branch, Agricultural Research Service, U. S. Department of Agriculture, for examining whole mounts and sections of the trematode of this report, and commenting on its identity.
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