Tetrapoda (and the new genus _Tiktaalik_)
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.
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