Phylum Chordata Bateson, 1885 - chordates Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758 Subclass Neornithes Gadow, 1893 see Clade Neornithes Gadow, 1893 Superorder Neognathae Pycraft, 1900 see Cohort Neognathae Pycraft, 1900 Order Sphenisciformes Sharpe, 1891 1 Family Spheniscidae Bonaparte, 1831 - penguins