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
Tetrapoda
Eusthenopteron, ≈385 Ma
Tiktaalik, ≈375 Ma
Acanthostega, ≈365 Ma
Stegocephali
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Stegocephali is a clade of vertebrate animals containing all fully limbed tetrapodomorphs. It is equivalent to a broad definition of the superclass Tetrapoda: under this broad definition, the term "te
Tetrapod
…in living organisms) than paleontologists (who primarily use the apomorphy-based definition). In 1998, he re-established the defunct historical term Stegocephali to replace the apomorphy-based definition of tetrapod used by many authors. Other paleontologists use the term stem-tetrapod to refer to those tetrapod-like…
Typical 19th-century depiction of a primitive stegocephalian, based on modern anurans and fossils now recognised as belonging to mastodonsaurids and Bromsgroveia
Eucritta 1DB white background