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Re: Back-evolution of limbs.

before either reptiles or mammals were terrestrial, their ancestors were


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?