Relationships of Fossil and Living Elasmobranchs |
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| Authors: | SCHAEFFER, BOBB WILLIAMS, MICHAEL |
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| Affiliation: | 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 |
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| Abstract: | Preliminary cladistic analysis corroborates the hypothesis thatthe Elasmobranchii and the Holocephali are sister groups, andthat 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 theoryof relationships has been proposed for six better known genera(Xenacanthus, Denaea, Cladoselache, Hybodus, Ctenacanthus andPaleospinax) by evaluation of certain characters in the skull,postcranial axial skeleton, fin supports, and fins. |
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