Re: Back-evolution of limbs.

[Betty Cunningham <bettyc@flyinggoat.com>]

before either reptiles or mammals were terrestrial, their ancestors were
fishy

-Betty

Larry Dunn wrote:
> 
> ---Jeff Hecht <jhecht@world.std.com> wrote:
> > But marine mammals and reptiles _have_ returned to their ancestral
> medium,
> > the sea, and the flippers of an ichthyosaur or dolfin resemble the
> fins of
> > fast predatory fish, e.g. sharks.
> 
> My understanding is that both the earliest reptiles and the earliest
> mammals were purely terrestrial forms, so I am confused.  What do you
> mean?