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 Cohort Palaeognathae Pycraft, 1900 1 Subcohort Crypturi Goodchild, 1891 2 Subcohort Ratitae Merrem, 1813