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Re: Limb Evolution - "Old" genes



On 5/24/07, John Conway <john.a.conway@gmail.com> wrote:
Colin McHenry wrote:
> Has anyone got a definition of Living Fossil that they think works?

How about a kronophylognetic definition:

"Any species that is more closely related to a fossil organism more than
30 million years old than it is to any other living species."

Howzat? Completely arbitrary but it seems to work if you ignore the
species problem.

But a living fossil does not need to have a morphological conservatism too - to look like ancient long ago extinct relatives -?

[]s,

Roberto Takata