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Petrolacosaurus , the Oldest Known Diapsid Reptile

1977; American Association for the Advancement of Science; Volume: 196; Issue: 4294 Linguagem: Inglês

10.1126/science.196.4294.1091

1095-9203

Robert R. Reisz,

Evolution and Paleontology Studies

Petrolacosaurus, an Upper Pennsylvanian reptile, presents a combination of features that place it within a distinct family of the Eosuchia while also evidencing strong relationships to the ancestral reptiles. It is therefore the earliest and most primitive representative of the largest assemblage of fossil and living reptiles, collectively called diapsids.