PALEOGNATHS
  \-+--Struthioniformes
    |     \--Struthionidae (Ostriches)
    |
    \-+--+--Rheiformes
      |  |    \--Rheidae (Rheas)
      |  |
      |  \-+--Casuariiformes
      |    |    \--+--Dromaiidae (Emus)
      |    |       \--Casuariidae (Cassowaries)
      |    |
      |    \--+--Apterygiformes
      |       |    \--Apterygidae (Kiwis)
      |       |
      |       \--†Aepyornithiformes (Elephant Birds)
      |            \--†Aepyornithidae
      |                \-+--Mullerornis
      |                  \--Aepyornis
      |
      \-+--†Dinornithiformes (Moas)
        |     \-+--†Megalapteryidae = Megalapteryx
        |       \-+--†Dinornithidae = Dinornis
        |         \-†Emeidae
        |             \-+--Pachyornis
        |               \-+--Anomalopteryx
        |                 \-+--Euryapteryx
        |                   \--Emeus
        |
        \--+--Lithornithiformes
           |    \--†Lithornithidae
           |
           \--Tinamiformes
                \--Tinamidae (Tinamous)