Digit (anatomy)
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A digit is one of several most distal parts of a limb, such as fingers or toes, present in many vertebrates.
Radiogram of a polydactyl left hand.
Mikhail Tal at the 1961 European chess championship.
A reconstruction of Panderichthys.
Tetrapod
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A tetrapod is any vertebrate animal of the clade Tetrapoda. Tetrapods include all extant and extinct amphibians and amniotes, with the latter in turn evolving into two major clades, the sauropsids and
Eusthenopteron, ≈385 Ma
Tiktaalik, ≈375 Ma
Acanthostega, ≈365 Ma