Name: Araeoscelis
(Thin
legs).
Phonetic: A-ray-oh-scel-is.
Named By: Samuel Wendell Williston - 1913.
Synonyms: Ophiodeirus
Classification: Chordata, Reptilia,
Diapsida, Araeoscelida.
Species: A. gracilis, A. casei.
Type: Insectivore.
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.
Araeoscelis
is another representative of the early diapsids. The teeth of
Araeoscelis were quite large and blunter than its
contemporary
Petrolacosaurus,
suggesting that it specialised in insects with tougher
bodies.
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.
Further reading
- New Permian reptiles; rhachitomous vertebrae. - Journal of Geology
18:585-600. - S. W. Williston - 1910.