Skip Navigation

American Zoologist 1965 5(2):295-307; doi:10.1093/icb/5.2.295
© 1965 by The Society for Integrative and Comparative Biology
This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Add to My Personal Archive
Right arrow Download to citation manager
Right arrow Request Permissions
Google Scholar
Right arrow Articles by OLSON, E. C.
Right arrow Search for Related Content
Social Bookmarking
Add to CiteULike   Add to Connotea   Add to Del.icio.us  
What's this?

RELATIONSHIPS OF SEYMOURIA, DIADECTES, AND CHELONIA

EVERETT C. OLSON
University of Chicago

Evidence now available supports the concept of close relationship between the seymouriamorphs and diadectids, with the latter a specialized offshoot of the former. Diadectes itself clearly is not a progenitor of Chelonia. The seymouriamorphdiadectid complex may be a sterile line, except for the gephyrostegids which, originating very early among seymouriamorphs, may have led to true reptiles.

There is some evidence, mostly highly tentative, that procolophons and their probable descendants, the pareiasaurs, may have arisen from the non-gephyrostegid seymouriamorph stock. Chelonia could have found their ancestery within the procolophons or pareiasaurs. If this is the case, and only additional study can confirm or deny it, then the concept of the Parareptilia, as proposed earlier (Olson, 1947), may retain much of its original meaning, with the Diadectidae, however, far removed from the ancestry of the Chelonia.


Add to CiteULike CiteULike   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us    What's this?




Disclaimer:
Please note that abstracts for content published before 1996 were created through digital scanning and may therefore not exactly replicate the text of the original print issues. All efforts have been made to ensure accuracy, but the Publisher will not be held responsible for any remaining inaccuracies. If you require any further clarification, please contact our Customer Services Department.