Struthioniformes

Apterygidae Gray, 1840

Casuariidae Kaup, 1847

Dromaiidae Richmond, 1908

Dromornithidae Vigors, 1825

Eleutherornithidae Wetmore, 1951

Namornis Pickford, Senut & Dauphin, 1995

Opisthodactylidae Ameghino, 1895

Palaeostruthio Burchak-Abramovich, 1953

Palaeotididae

Proceriavis Harrison & Walker, 1979

Rheidae Bonaparte, 1849