Figure 16.14   Matching fins and legs of the fi rst tetrapods: the pectoral fin of the Devonian sarcopterygian fish Eusthenopteron (a) shows bones that are probable homologs of tetrapod arm bones, such as in the Devonian amphibian Acanthostega (b). Acanthostega had eight fingers and Ichthyostega had seven toes on its hindlimb (c). (d) The early tetrapod Acanthostega. (Courtesy of Mike Coates.)

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