Phylum Chordata Bateson, 1885 - chordates Subphylum Vertebrata Cuvier, 1812 - vertebrates Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758 Order Casuariiformes Sclater, 1880 Family Casuariidae Kaup, 1847 - cassowaries Family Dromaiidae Huxley, 1868 - emus