 Natura - nature | | Mundus Plinius - physical world | | Naturalia | | Biota | | Domain Eukaryota - eukaryotes | | Kingdom Animalia C. Linnaeus, 1758 - animals | | Subkingdom Bilateria (Hatschek, 1888) Cavalier-Smith, 1983 - bilaterians | | Branch Deuterostomia Grobben, 1908 - deuterostomes | | Infrakingdom Chordonia (Haeckel, 1874) Cavalier-Smith, 1998 | | Phylum Chordata Bateson, 1885 - chordates | | Subphylum Vertebrata Cuvier, 1812 - vertebrates | | Infraphylum Gnathostomata auct. - jawed vertebrates | | Superclass Tetrapoda Goodrich, 1930 - tetrapods | | Series Amniota | | [Class Aves C. Linnaeus, 1758 - birds] see Infraclass Aves (C. Linnaeus, 1758) | | [Subclass Neornithes Gadow, 1893] see Superdivision Neornithes | | [Infraclass Eoaves] see Parvclass Eoaves Sibley et al., 1988 |  [Parvclass Ratitae (Merrem, 1813)] see Subcohort Ratitae Merrem, 1813 |  Order †Palaeocursornithiformes |
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