Subclass Avialae Gauthier, 1986
see Clade Avialae Gauthier 1986
Count: [o] 31o;113f; ‡2o;6f; †11o;14f
Infraclass Aves Linnaeus, 1758
see Subclass Aves Linnaeus, 1758
Count: [o] 31o;113f; ‡2o;6f; †11o;14f
Parvclass Neornithes Gadow, 1893
see Subclass Neornithes Gadow, 1893
Count: [o] 31o;113f; ‡2o;6f; †4o;7f
Cohort Neognathae Pycraft, 1900
Count: [o] 27o;107f; ‡3f; †4o;7f
Subcohort Neoaves Sibley et al., 1988
Count: [o] 25o;99f; ‡2f; †2o;4f
Division Natatores Baird, 1858
Count: [f†f] 8o;21f; †1o;1f
Subdivision Stegano-grallatores B.C. Livezey & R.L. Zusi, 2007
Count: [f†f] 4o;14f; †1o;1f
Superorder Pelecanimorphae Huxley, 1867
Count: [f†f] 2o;7f; †1o;1f
Order Pelecaniformes Sharpe, 1891
Count: [f] 6f
Suborder Steganopodes Chandler, 1916
Count: [f] 5f
Infraorder Pelecanides Sharpe, 1891
Count: [f] 4f
Parvorder Sulida (Reichenbach, 1849) Sibley et al., 1988
Count: [f] 3f
1 Superfamily Suloidea Reichenbach, 1849
Count: [f] 1f
2 Superfamily Phalacrocoracoidea Bonaparte, 1854
Count: [f] 2f