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Science 4 August 1967:
Vol. 157. no. 3788, pp. 565 - 568
DOI: 10.1126/science.157.3788.565
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Articles

Archosaurian Reptiles: A New Hypothesis on Their Origins

Osvaldo A. Reig 1

1 Instituto de Zoologia Tropical, Facultad de Ciencias, Universidad Central de Venezuela, Caracas

The characteristics of the first archosaurs, the proterosuchian thecodonts, show that neither of the supposed common ancestors of archosaurs and lepidosaurs could actually be an ancestor of archosaurs. Instead, the evidence seems to indicate that the archosaurian ancestors are probably in the ophiacodont-varanopsid group of the pelycosaurian synapsids. In particular, the Varanopsidae are strongly indicative of proterosuchian relationships, as they have evolved some characters which are elsewhere found only in archosaurs. Archosaurs and lepidosaurs apparently have different origins; the former come from the pelycosaurs, and the latter come from the captorhinomorph cotylosaurs through the Millerettiformes.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Petrolacosaurus, the Oldest Known Diapsid Reptile.
R. R. Reisz and R. R. REISZ (1977)
Science 196, 1091-1093
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Science. ISSN 0036-8075 (print), 1095-9203 (online)