Definition
A "diapsid reptile" refers to a reptile that belongs to the Diapsida group, characterized by having two temporal fenestrae (openings) on each side of its skull. This skull structure allows for greater jaw muscle attachment and a stronger bite. Most modern reptiles, such as lizards, snakes, and crocodiles, are diapsids. This contrasts with anapsids, which lack these openings. The diapsid skull is considered an evolutionary advancement, providing greater versatility and power.