Early hypotheses suggested that the digits of tetrapods (land vertebrates) were homologues of fin radials, but this idea fell out of favour on the basis of developmental studies and also on the fin of ...

Tetrapods, the first four-legged land animals, are regarded as the first organisms that had fingers and toes. Now researchers can show that this is wrong. Using medical x-rays, they found rudiments of ...

The relationship of limbed vertebrates (tetrapods) to lobe-finned fish (sarcopterygians) is well established, but the origin of major tetrapod features has remained obscure for lack of fossils that ...

a, b, Comparison of the anatomy of the pectoral limb endoskeleton (a) and humerus (b) of stem-tetrapod fish (Panderichthys, Tiktaalik and Elpistostege) and an early tetrapod (Tulerpeton).

Tetrapods, the first four-legged land animals, are regarded as the first organisms that had fingers and toes. Now researchers at Uppsala University can show that this is wrong. Using medical x-rays, ...