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Re: Synapsids weren't reptiles?

I would guess characteristics present in all extant reptiles are not found in 
basal amphibians, and characteristics found in all extant amphibians were not 
present in basal reptiles, but were found in basal amphibians.

How do you know amphibians didn't evolve from sharks?

The better question is why do you think reptiles did evolve from amphibians?

An amphibious tetrapod, yes, but a member of Amphibia, no.
One describes a lifestyle, much like a seal, crab, or a mudskipper, the other 
describes a specific group of animals.

I suggest a look at this page, and the hyperlinked pages.


--- On Mon, 6/30/08, Dora Smith <villandra@austin.rr.com> wrote:

> From: Dora Smith <villandra@austin.rr.com>
> Subject: Re: Synapsids weren't reptiles?
> To: keesey@gmail.com, "Dinosaur Mailing List" <dinosaur@usc.edu>
> Date: Monday, June 30, 2008, 8:38 PM
> One other thing.   How do you know that reptiles did not
> evolve from 
> amphibians?
> Yours,
> Dora Smith
> Austin, TX
> tiggernut24@yahoo.com
> ----- Original Message ----- 
> From: "T. Michael Keesey"
> <keesey@gmail.com>
> To: "Dinosaur Mailing List"
> <dinosaur@usc.edu>
> Sent: Sunday, June 29, 2008 11:21 PM
> Subject: Re: Synapsids weren't reptiles?