This taxon is considered invalid subgroup of
of the valid taxon Avialae
according to the Paleobiology Database.
See the page for Avialae →
Bibliography
Original description
B. Petronievics. 1927. Nouvelles recherches sur l'ostéologie des Archaeornithes [New research on the osteology of the Archaeornithes]. Annales de Paléontologie 16:39-55