Named By: Samuel Wendell Williston - 1913.
Classification: Chordata, Reptilia, Diapsida, Araeoscelida.
Species: A. gracilis, A. casei.
Size: 60 centimetres long.
Known locations: USA, Texas - Arroyo Formation, Nocona Formation, Waggoner Ranch Formation..
Time period: Artinskian of the Permian.
Fossil representation: Well enough preserved to allow for reconstruction.
is another representative of the early diapsids. The teeth of
Araeoscelis were quite large and blunter than its
suggesting that it specialised in insects with tougher
Although officially considered a diapsid with two fenestrae behind the eye socket, the lower fensetra was closed with bone, meaning that Araeoscelis could be considered a euryapsid. This adaptation may have allowed for stronger jaw muscles to help bite through the aforementioned insect bodies.
The overall morphology of Araeoscelis is similar to a lightweight modern day lizard.
- New Permian reptiles; rhachitomous vertebrae. - Journal of Geology 18:585-600. - S. W. Williston - 1910.