[Avialae] Gauthier 1986
   Aves Linnaeus 1758 [Gauthier 1986], nom. cl. inval. see Subclass Aves Linnaeus, 1758
     1 Genus †Archaeopteryx Meyer, 1861
     2.1 Genus †Rahonavis Forster, Sampson, Chiappe & Krause, 1998
     2.2 Pygostylia Chatterjee 1997 [Chiappe 2001]