Re: Prolacerta/Prolacertaform Sources

John Harshman wrote:
Developmental anomalies have often been studied
as a guide to developmental processes. I don't know of any duplicated
limbs, only bifurcated ones, i.e. extra fingers, the occasional extra
hand, and perhaps a spare radius and ulna. But never a complete and
separate arm. I could be wrong.

With Siamese-twinning you can get a complete and nearly separate
whole body (although these are often somewhat reduced), so why
not a complete and separate limb? Is the question then whether
Siamese-twinning could ever be a heritable mutation? Why not?
(I could be not even wrong.)

Cliff

.