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A New World occurrence of Notidanodon lanceolatus (Chondrichthyes, Hexanchidae) and comments on hexanchid shark evolution

Published online by Cambridge University Press:  20 May 2016

Douglas J. Long ,
Michael A. Murphy  and
Peter U. Rodda
Douglas J. Long
Affiliation:
1Department of Integrative Biology and the Museum of Paleontology, University of California, Berkeley 94720
Michael A. Murphy
Affiliation:
2Department of Geology, University of California, Davis 95616
Peter U. Rodda
Affiliation:
3Department of Geology, California Academy of Sciences, San Francisco, 94118-4599
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Abstract

Notidanodon lanceolatus Woodward is reported from Late Aptian strata of northern California. This specimen, the oldest fossil cow shark (Hexanchidae) in the New World, greatly extends the geographic distribution of this species and confirms the eurytopic distribution of this genus. We suggest that cow shark teeth evolve in an orderly sequence in which the mesial edge of the tooth is at first smooth (Notidanus muensteri), then serrate (Notidanus serratus, Notorynchus aptiensis), and finally dentate (Notidanodon lanceolatus).

Type
Research Article
Information
Journal of Paleontology , Volume 67 , Issue 4 , July 1993 , pp. 655 - 659
Copyright
Copyright © The Paleontological Society 

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