Subclass Avialae Gauthier, 1986 see Clade Avialae Gauthier 1986 Infraclass Aves Linnaeus, 1758 see Subclass Aves Linnaeus, 1758 Parvclass Neornithes Gadow, 1893 see Subclass Neornithes Gadow, 1893 1 Cohort Palaeognathae Pycraft, 1900 2 Cohort Neognathae Pycraft, 1900