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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
Tetrapoda
Eusthenopteron, ≈385 Ma
Eusthenopteron, ≈385 Ma
Tiktaalik, ≈375 Ma
Tiktaalik, ≈375 Ma
Acanthostega, ≈365 Ma
Acanthostega, ≈365 Ma
Amniote
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Amniotes are tetrapod vertebrate animals belonging to the clade Amniota, a large group that comprises the vast majority of living terrestrial and semiaquatic vertebrates. Amniotes evolved from amphibi
Tetrapod
…four-limbed ancestors, including those which have lost some or all of these limbs, e.g. snakes. Tetrapods include all extant and extinct amphibians and amniotes, with the latter in turn evolving into two major clades, the sauropsids (reptiles, including dinosaurs and therefore birds) and synapsids (extinct…
Amniota
Amniota
Archaeothyris, one of the most basal synapsids, first appears in the fossil records about 306 million years ago.
Archaeothyris, one of the most basal synapsids, first appears in the fossil records about 306 million years ago.
By the Mesozoic, 150 million years ago, sauropsids included the largest animals anywhere. Shown are some late Jurassic dinosaurs, including the early
By the Mesozoic, 150 million years ago, sauropsids included the largest animals anywhere. Shown are some late Jurassic dinosaurs, including the early bird Archaeopteryx perched on a tree stump.