Gegenbaur Revisited: Assessing the "Limbs from Gills" Scenario

Science Daily announces:

Sonic hedgehog gene provides evidence that our limbs may have evolved from sharks' gills

Latest analysis shows that human limbs share a genetic programme with the gills of cartilaginous fishes such as sharks and skates, providing evidence to support a century-old theory on the origin of limbs that had been widely discounted.

An idea first proposed 138 years ago that limbs evolved from gills, which has been widely discredited due to lack of supporting fossil evidence,...