Coelacanthimorpha (coelacanths)

Dipnoi (lungfish)

# Osteolepimorpha

# Porolepimorpha

# Rhizodontimorpha

Stegocephalia (terrestrial vertebrates)

Have muscular limbs with well-defined joints and digits (fingers and toes). Certain cranial (head) bones have been lost, permitting the head to move relative to the body, unlike other sarcopterygians.  Not all stegocephalians were terrestrial - some of early representatives were probably aquatic. The earliest known fossils are from the Upper Devonian of east Greenland.

# Subclass: Temnospondyli

Extinct medium-szed to large carnivores rather like crocodiles in appearance and habitat that were the dominant tetrapods in the Carboniferous and which occupied habitats ranging from aquatic to terrestrial. Known from the Middle and Late Permian deposits in South Africa.

Tetrapoda (tetrapods)

Originated about 350 million years ago.