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American Zoologist 1977 17(2):293-302; doi:10.1093/icb/17.2.293
© 1977 by The Society for Integrative and Comparative Biology
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Relationships of Fossil and Living Elasmobranchs

BOBB SCHAEFFER1 and MICHAEL WILLIAMS2
1Department of Vertebrate Paleontology, The American Museum of Natural History New York, New York 10024
2Department of Paleontology, Cleveland Museum of Natural History Cleveland, Ohio,44106

Preliminary cladistic analysis corroborates the hypothesis that the Elasmobranchii and the Holocephali are sister groups, and that the Chondrichthyes are more closely related to the Teleostomi (Acanthodi plus Osteichthyes) than either is to the Placodermi. In regard to the Paleozoic and Mesozoic elasmobranchs, a theory of relationships has been proposed for six better known genera (Xenacanthus, Denaea, Cladoselache, Hybodus, Ctenacanthus and Paleospinax) by evaluation of certain characters in the skull, postcranial axial skeleton, fin supports, and fins.


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