Tetrapoda (and the new genus _Tiktaalik_)

Ken Kinman kinman2 at YAHOO.COM
Fri Apr 7 16:04:21 CDT 2006

     Panderichthys already had evolved many "tetrapod" characteristics:  flattening of body and head (eyes situated dorsally); skull and teeth very much like early tetrapods; and loss of the dorsal and anal fins.  The skull was so tetrapod-like that Panderichthys was classified as such until postcranial material was found.  It was placed outside of Tetrapoda mainly because it has fins and lack digits, and I am still inclined to follow that tradition.

      However, I am inclined to include Ventastega, Metaxygnathus, and Family Elginerpetonidae within Tetrapoda, because like other stem-tetrapods, they possess a parasymphysial fang as well as coronoid fangs (a transitional combination).  My main question is whether to also include slightly more primitive forms (such as Livoniana and Tiktaalik) in the Tetrapoda.

             Ken Kinman

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