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Re: Back-evolution of limbs.
before either reptiles or mammals were terrestrial, their ancestors were
Larry Dunn wrote:
> ---Jeff Hecht <firstname.lastname@example.org> wrote:
> > But marine mammals and reptiles _have_ returned to their ancestral
> > 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