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Temporal range: early Devonian-Recent
|The basal tetrapodomorph Tiktaalik|
Advanced transitional fossils between fish and the early labyrinthodonts, like Tiktaalik, are informally called 'fishapods' by their discoverers. They are half-fish half-tetrapods, in appearance and limb morphology.
- the stem group tetrapoda, extinct fossil relatives of the crown group. This is a paraphyletic unit covering the fish to tetrapod transition. Tetrapodomorpha contains several groups of related lobe-finned fishes, collectively known as the osteolepiforms.
- the crown group tetrapods, the last common ancestor of living tetrapods and all of its descendants.