Fins into Limbs: Evolution, Development, and Transformation by Brian K. Hall, Ed., University of Chicago Press, Chicago, 2007. 459 pp.Reptile and mammal limbs and bird wings are all modifications of the original tetrapod limb that, in turn, arose from the fins of earlier fish. That original transition was complex with some parts of the original fin being incorporated in the new limb, others not. Subsequent modification of the tetrapod limb has also, obviously, been diverse, including the functional reversal that involved the forelimbs of the forms ancestral to whales, seals, etc. turning “back” into fins. Continue reading New Book: Fins into Limbs (Evolution, Development) →