Relationship of Aves
Within Theropoda                                    Oviraptoridae
                                                       |
                                                       |  Dromaeosauridae
                                                       |     \
                                       Tyrannosauridae |      \
                                          \            |       \   Aves
                                           \           |        \  /
              Titanosauridae                \          |         \/
                \                            \         |         /                             
                 \                            \        |       \/   
                  \   Cetiosauridae            \       |       /\
                   \ /                          \      |      /  Maniraptora
                    o        "Compsognathus"     \     |     / 
          SAUROPODA  \                   \        \    |    /
                      \                   \        \   |   /
                       \                   \        \  |  /
                        \                   \        \ | /
                         \    Ceratosauria   \        \|/                                            
                          \      \            \        o        
                           \      \            \      / Maniraptiformes
                            \      \/           \    /
                             \     /\            \  /
                              \      \            \/
                               \      \           /   
                                \      \         /
                                 \      \       /
                                  \      \    \/ 
                                   \      \   /\
                                    \      \ /  Coelurosauria
                                     \      o   
                                      \    / Neotheropoda
                                       \ \/
                                        \/\      
      SAURISCHIA |                      /  THEROPODA
      ---------------------------------/
                 |

Simplified Cladogram, after illustration in
_Encyclopedia of Dinosaurs_, P.J. Currie and
K. Padian, Editors, 1997, Academic Press