Taxonomy

Lobe-finned fishes: coelacanths, lung fish, and tetrapods

Tetrapods - Amniotes & Amphibians (and extinct four-legged fishes)
Amniote - Synapsida and Sauropsida

Sauropsida - Archosaurs and other reptiles
Archosaurs - Dinosauria & crocodilians
Dinosauria - Theropoda (birds) and other dinosaurs

Synapsida - mammals