Struthioniformes
Phylum: Chordata
Subphylum: Vertebrata
Class: Aves
Subclass: Neornithes (2,057 genera / 9,672 species)
Infraclass: Eoaves
Parvclass: Ratitae
Order: Struthioniformes (5 genera / 10 species – ostrich, rheas, cassowaries, emu)
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Suborder: Struthioni
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Infraorder: Struthionides
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Family: Struthionidae (1/1 – ostrich)
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Family: Casuariidae (2/4)
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Tribe: Casuariini (cassowaries)
Tribe: Dromaiini (emu)
