But the prevalence of the pentadactyl limb argues just the opposite: That for whatever prehistoric reasons, an ancestral tetrapod had five digits per limb, and all of its descendants did as well.

This early tetrapod from the side of the road in Clinton ... We can see the internal bony structure that showed it was a muscular fin; it probably had a lot of muscle attachments within the ...

This fact enabled the research team to reconstruct the original architecture of the set of chromosomes (karyotype) of the ancestral tetrapod from ... are similar in bone structure to our arms ...