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Re: Limb Evolution - "Old" genes
On 5/24/07, John Conway <email@example.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
But a living fossil does not need to have a morphological conservatism
too - to look like ancient long ago extinct relatives -?