studies show that mesosaurs do not form a clade with turtles that excludes diapsids, but fossil evidence still suggests that mesosaurs form a group with parareptiles. In most recent studies, Reptilia is not used as a crown group and still contains mesosaurs and Parareptilia. References Permian reptiles Prehistoric marine reptiles Cisuralian first appearances Cisuralian extinctions ru:Мезозавр