Subclass Avialae Gauthier, 1986 see Clade Avialae Gauthier 1986 Infraclass Aves Linnaeus, 1758 see Subclass Aves Linnaeus, 1758 Parvclass †Eoaves Sibley et al., 1988 see Cohort Palaeognathae Pycraft, 1900 1 Order †Lithornithiformes Houde, 1988