Taxonomic position and phylogenetic relationships of Colobomycter pholeter, a small reptile from the Lower Permian of Oklahoma

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Abstract
Redescription of Colobomycter pholeter Vaughn, a small amniote from the Lower Permian of Oklahoma, provides evidence that it is not a mammal-like reptile. Osteological features used to associate Colobomycter with the family Eothyrididae are also present in protorothyridids. Colobomycter has a large sheet-like jugal in the temporal region, precluding the presence of a pelycosaurian lateral temporal opening. Derived osteological features shared with members of the family Protorothyrididae suggest that Colobomycter might be a member of that family, but this assignment must remain tentative because of the fragmentary nature of the known specimens.

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