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Life > Eukaryotes > Opisthokonta > Metazoa (animals) > Bilateria > Deuterostomia > Chordata > Craniata > Vertebrata (vertebrates)  > Gnathostomata (jawed vertebrates) > Teleostomi (teleost fish) > Osteichthyes (bony fish) > Class: Sarcopterygii (lobe-finned fish) > 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.





# non-amniotes

These taxa include Diadectomorpha (sister-group to Amniota) and Solenodonsaurus.


Amniota (reptiles, birds, mammals and extinct relatives)


Reptilia (reptiles, including birds)

Psammobates tentorius (Tent Tortoise)

Synapsida (mammal-like reptiles and mammals)


# non-therapsids


Therapsida (mammals and their extinct relatives)


# Biarmosuchia


# Eotitanosuchia


# Dinocephalia


# Anomodontia




# Gorgonopsia


# Therocephalia






Subclass: Mammalia





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