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Science 3 June 1977:
Vol. 196. no. 4294, pp. 1091 - 1093
DOI: 10.1126/science.196.4294.1091
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Articles

Petrolacosaurus, the Oldest Known Diapsid Reptile

ROBERT R. REISZ 1

1 Department of Biology, Erindale College, University of Toronto, Mississauga, Ontario, Canada

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.

Submitted on January 6, 1977
Revised on February 10, 1977

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Science. ISSN 0036-8075 (print), 1095-9203 (online)