Although they were not closely related to lizards, outwardly they generally resembled stocky lizards. The key difference from lizards is their Anapsid skulls - and a particular distinguishing feature of Procolophonids were backward-pointing spikes found on their cheeks (in the case of one genus, Hypsognathus, there were many such spikes).
Earlier forms of Procolophonids generally had sharp pointed teeth, suggestive of an insectivorous diet. However the teeth of later forms suggests a herbivorous (plant-eating) diet.
One other interesting fact about Procolophonids is that they are (at the time of writing) the earliest known Tetrapod to have reached the Antarctic (during the early Triassic period).
Procolophonids were Anapsid reptiles of the Permian and Triassic periods
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