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Named By: H. H. Lane in 1945
Time Period: Pennsylvanian, 302 Ma
Location: USA, Kansas
Size: 40 centimetres long
Diet: unavailable
Fossil(s): Well enough preserved to reveal the full morphology
Classification: | Chordata | Reptilia | Diapsida | Araeoscelida | Petrolacosauridae |

Petrolacosaurus was a small, 40-centimetre (16 in) long reptile, and the earliest known diapsid. It is at the base of the largest reptilian radiation that includes eosuchians, thecodonts, rhynchosaurs, pterosaurs, dinosaurs, and eventually birds.

Read more about Petrolacosaurus at Wikipedia
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