Fish
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A fish is an aquatic, anamniotic, gill-bearing vertebrate animal with a tough cranium to protect the brain, but lacking limbs with digits. Fish can be grouped into the more basal jawless fish and the
Balantiocheilos melanopterus Karlsruhe Zoo 02
Dunkleosteus was a giant Devonian armoured placoderm, c. 400 mya.
Largest: whale shark
Smallest: e.g. Paedocypris progenetica
Tetrapod
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A tetrapod is any vertebrate animal of the clade Tetrapoda. The main diagnostic and defining trait of tetrapods is having four limbs, connected to the shoulder- and pelvic girdles, for which the group
Fish
…tradition of grouping all fish into a single class (Pisces), modern phylogenetics views fish as a paraphyletic group that includes all vertebrates except tetrapods. In English, the plural of "fish" is fish when referring to individuals and fishes when referring to species. Most fish are cold-blooded, their body…
Tetrapoda
Eusthenopteron, ≈385 Ma
Tiktaalik, ≈375 Ma
Acanthostega, ≈365 Ma