Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758 Subclass Ornithurae Haeckel, 1866 see Clade Ornithurae Haeckel 1866 [Gauthier 1986] {Chiappe 1991} Infraclass Ratitae (Merrem, 1813) P. Brodkorb, 1963 see Parvclass Ratitae (Merrem, 1813) Order Apterygiformes Haeckel, 1866 Family Apterygidae Gray, 1840 - kiwis 1 Genus †Pseudapteryx Lydekker, 1891