habits far off from those in a pelycosaur ancestor and entirely distinct from the milder dental differentiations of ophiacodontids. The skull measure of Eothyris parkeyi is extremely small for a pelycosaur. Eothyris parkeyi is represented by a complete skull, but the postcranial skeleton is unknown. Therefore, there is the little foundation to diagnose the extended family. Also, the skull of Eothyris parkeyi is described according to that form. Whether many of the striking primitive features were repeated in other genera is unknown. The order of the portion of bones in the skull roof of Oedaleops and Eothyris parkeyi conforms to a basic pattern in primitive reptiles and is shared with various groups such as millerosaurs and captorhinomorphs, and ophiacodonts. The major distinguishing features of the skull are that it possessed a pair of long, large, fang-like teeth on each side of the upper jaw. The use for these teeth is not known, but Eothyris parkeyi might have used them to eat small prey. All teeth in its mouth were sharp, with all but the enlarged four fangs being small and short. The skull is short and broad, two features which suggest that Eothyris parkeyi had a snapping, rapid bite. Dental specializations are related to predaceous habits. The Eothyrids tended to be dominant types and it is interesting that except for little Eothyris parkeyi, which may be considered as a small late survivor. Its teeth suggest that it was a carnivore, but because Eothyris parkeyi is known only from a skull, it is difficult to say much else about its way of life. References External links www.kheper.net www.palaeos.com Caseasaurs Prehistoric synapsid genera Cisuralian synapsids of North America Artinskian genus first appearances Artinskian genus extinctions Taxa named by Alfred Romer Fossil taxa described in 1937