Bailey, Reeve M. Formerly, Division of Fishes, Museum of Zoology, University of Michigan, Ann Arbor, Michigan.
Boschung, Herbert T. Formerly, Department of Biological Sciences, University of Alabama, Tuscaloosa, Alabama.
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An elasmobranch subdivision of cartilaginous fishes known collectively as the rays, skates, or batoids. Batoidea is one of the two subdivisions of the subclass Elasmobranchii (class Chondrichthyes) and consists of 4 extant orders, 17–20 families, and more than 600 species. The other subdivision, Selachii, includes the sharks. Some investigators group the modern sharks and several families of fossil sharks plus the modern rays in a superorder, Euselachii, supposedly a monophyletic unit. Others group all recent sharks and rays in two separate subdivisions, Selachii and Batoidea, respectively, as presented herein.
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