|Life restoration of Procolophon pricei from the Early Triassic of South Africa|
They were shaped like stocky lizards, with broad-cheeked skulls. Their cheeks sported a stout backward-pointing spike. Hypsognathus, from North America, had many cheek spikes. Procolophon, the genus after which the group was named, is unusual. Their skulls resemble the turtles', sharing a posttemporal fenestra. Accordingly, they have historically been classed alongside the turtles under the Anapsida.
Up to the early Triassic, their teeth were sharp, indicating an insectivorous diet. Later in the Triassic their teeth became broader, indicating a switch to a herbivorous diet. They became extinct at the end of the Triassic.
- Cisneros, J. C. (2008). "Phylogenetic relationships of procolophonid parareptiles with remarks on their geological record". Journal of Systematic Palaeontology. 6 (3): 345–366. doi:10.1017/S1477201907002350.
- Hans-Dieter Sues and Robert R. Reisz (2008). "Anatomy and Phylogenetic Relationships of Sclerosaurus armatus (Amniota: Parareptilia) from the Buntsandstein (Triassic) of Europe". Journal of Vertebrate Paleontology. 28 (4): 1031–1042. doi:10.1671/0272-4634-28.4.1031.
- Ruta, M.; Cisneros, J. C.; Liebrecht, T.; Tsuji, L. A.; Müller, J. (2011). "Amniotes through major biological crises: Faunal turnover among Parareptiles and the end-Permian mass extinction". Palaeontology. 54 (5): 1117–1137. doi:10.1111/j.1475-4983.2011.01051.x.
- Lambert, David (2001). Dinosaur Encyclopedia. New York: Dorling Kindersley. p. 72.
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