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 Pteroclidiformes see Infraorder Pteroclides 1 Family Pteroclididae - sandgrouse see Family Pteroclidae Bonaparte, 1831