Urocleidus aculeatus (Van Cleave and Mueller, 1932) (Monogenea: Ancyrocephalinae) from Stizostedion vitreum (Mitchill) (Pisces: Percidae) in eastern North America: anatomy and systematic position

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Abstract
The anatomy of Urocleidus aculeatus (Van Cleave and Mueller, 1932) Mueller, 1934 from the gills of Stizostedion vitreum (Mitchill) in Ontario, Canada, and New York State, U.S. A., is redescribed. Urocleidus aculeatus is regarded as type species of Urocleidus Mueller, 1934 and a revised generic diagnosis is presented. The taxonomic importance of some anatomical characters and the possible origin of some ancyrocephaline forms are discussed.