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 Order †Lithornithiformes Houde, 1988 1 Family †Lithornithidae Houde, 1988