|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
|M. W. Maisch and E. V. I. Gebauer 2005||Autapomorphies include snout of typically squared-off shape. Anterior surface of premaxillaries flat, without a longitudinal ridge, meeting lateral surfaces of the snout in pronounced corners. Occipital exposure of squamosal small, only forming a narrow frame around the occipital elements. Further potential autapomorphies are: fenestra mandibularis long (more than one-third of the length of the entire mandible), low and narrow; sec- ondary palate highly vaulted; nasal boss very strongly developed; fenestra medio-palatinalis and fossa inter- pterygoidea elongate.|