All four-limbed vertebrates and their descendants are called tetrapods. The transition from an aquatic to a terrestrial environment has been viewed as one of the most remarkable events in all of tetrapod evolution (Shubin 1995; Boisvert 2005; Daeschler and Jenkins 2006; Shubin, Daeschler and Jenkins 2006).The taxonomic group Tetrapodomorpha, which includes tetrapods and tetrapodomorph fish with limb bone precursors in their fins (Ahlberg and Johansen...
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