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American Zoologist 1977 17(2):303-322; doi:10.1093/icb/17.2.303
© 1977 by The Society for Integrative and Comparative Biology
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Phyletic Relationships of Living Sharks and Rays

LEONARD J. V. COMPAGNO
Department of Biological Sciences, Stanford University Stanford, California, 94305

A set of hypotheses are developed for the origin of living sharks and rays and the interrelationships of their major groups, using some methods of cladistic analysis to relate groups with shared derived characters. Comparative studies on living sharks and rays combined with new data on fossil sharks suggests that the living groups ultimately stem from a common ancestral group of "neoselachian" sharks with many modern characters. Reinterpretations of "amphistyly" in modern sharks is presented on new data.


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