Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758
   Pygostylia Chatterjee 1997 [Chiappe 2001]
     Ornithothoraces Chiappe 1995
       †Enantiornithes Walker 1981 [Sereno 1998] see Infraclass Enantiornithes Walker, 1981
         †Longipterygidae Zhang, Zhou, Hou & Gu 2001 [O'Connor et al. 2009] see Family Longipterygidae Zhang, Zhou, Hou & Gu, 2001
           Genus †Longipteryx Zhang, Zhou, Hou & Gu, 2001