Monosphenodontidae
Monosphenodontidae is an extinct family of lizards belonging to the order Squamata. Fossils attributed to this family have been found in deposits dating from the Early Cretaceous to the Late Cretaceous periods. The geographic distribution of Monosphenodontidae fossils is primarily within North America and Europe, suggesting a relatively widespread presence across the Northern Hemisphere during the Mesozoic Era.
The defining characteristics of Monosphenodontidae relate to their cranial and dental morphology. They are generally recognized
The precise phylogenetic position of Monosphenodontidae within Squamata has been a subject of ongoing scientific discussion