Panderichthys was about 35 to 51 inches (90 to 130 centimeters) long. It is quite interesting as it believed that fish like Panderichthys were the ancestors of tetrapods (vertebrates with a four-limbed body plan which eventually moved to the land), as Panderichthys exhibits transitional features between those of lobe-finned fishes and tetrapods. These transitional fishes include fins with finger-like bones (but no elbows) intermediate between typical fish fins and tetrapod legs, and a vertical tube at the top of its head ("spiracle") which the fish would have used to breathe from water when submerged in mud, which is the evolutionary precursor of the stirrup bone (e.g. the stirrup bone found in the human ear).
Panderichthys was a fish that lived during the Devonian
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