Gorgonops ( literally `` Gorgon ' face '' ) is the name given to an extinct genus of therapsid which lived about 255-250 million years ago , during the latest part of the Permian period . Gorgonops ( literally `` Gorgon face '' ) is an extinct genus of therapsid which lived about 255-250 million years ago , during the latest part of the Permian Period .