The
Tetrapodomorpha (also known as
Choanata) are a
clade of
vertebrates consisting of
tetrapods (four-limbed vertebrates) and their closest
sarcopterygian relatives that are more closely related to living tetrapods than to living
lungfish. Advanced forms transitional between fish and the early
labyrinthodonts, such as
Tiktaalik, have been referred to as "fishapods" by their discoverers, being half-fish, half-tetrapods, in appearance and limb morphology. The Tetrapodomorpha contains the
crown group tetrapods (the last common ancestor of living tetrapods and all of its descendants) and several groups of early
stem tetrapods, and several groups of related lobe-finned fishes, collectively known as the
osteolepiforms. The Tetrapodamorpha minus the
crown group Tetrapoda are the
Stem Tetrapoda, a
paraphyletic unit encompassing the fish to tetrapod transition.