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 Pygopodo-tubinares B.C. Livezey & R.L. Zusi, 2007
Count: [f] 4o;7f
Superorder Gaviomorphae B.C. Livezey & R.L. Zusi, 2007
Count: [f] 2o;2f
Order Gaviiformes Wetmore & Miller, 1926
Count: [f] 1f
1 Family Gaviidae Allen, 1897 - divers
Count: -