It also had a second jaw joint made up of the same two bones as the jaw joints of all living mammals - the dentary or mandible, and the squamosal.

它还有第二个下颌关节， 由与所有现存哺乳动物的下颌关节相同的两块骨头组成——齿骨或下颌骨，以及鳞骨。