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Re: tetrapoda

On Thu, 13 Nov 1997, Jack wrote:

> Anyone have the formal cladistic definition of Tetrapoda handy?

Judging from what I see at the On-Line Tree of Life, it's something like
"all descendants of the most recent common ancestor of amphibians (narrow
definition -- all animals sharing more recent ancestry with frogs,
salamanders, and caecilians than with amniotes) and amniotes". This
excludes a lot of primitive forms like _Ichthyostega_. The more inclusive
clade Tetrapodomorpha would contain these. 

--T. Mike Keesey
http://umbc.edu/~tkeese1 -- Dinosaur Web Pages