Warning: This tree should not be taken as a phylogenetic presentation!
In truth it's a geographic presentation that may or may not have phylogenetic value.

Phylogeny of Paleognathia after Sibley & Ahlquist, 1990

Phylogeny of Paleognathia after Haddrath & Baker, 2001

Phylogeny of Paleognathia after Livezey & Zusi, 2007

<==o Paleognathia Huxley, 1867 (vanhaleukaiset nykylinnut)
   |?- †Eremopezus eocaenus Andrews, 1904 [Paleognathia incertae sedis]
   |?- †Stromeria fajumensis Lambrecht, 1929 [Paleognathia incertae sedis]
   |?-o †Eleutherornithidae [Paleognathia incertae sedis]
   |  |-- †Eleutherornis helveticus
   |  `-- †Proceriavis martini
   |--o “Oceaniac paleognaths”
   |  |?-o Casuariimorphae Livezey & Zusi, 2007 (“Australian paleognaths”)
   |  |  `?-o Casuariformes (Forbes, 1884) (emus and casuars; kasuaarilinnut)
   |  |     |?- †“Dromaius” gidju
   |  |     |--o Casuariidae Kaup, 1847 (casuars; kasuaarit)
   |  |     |  `--o Casuarius (casuars; kasuaarit)
   |  |     |     |?- †C. sp. Rich & van Tets, 1983; L. Plio. Aust. [NG]
   |  |     |     |--o C. casuarius (Linnaeus, 1758) (kypäräkasuaari)
   |  |     |     |  |-- C. c. casuarius
   |  |     |     |  |-- C. c. bicarunculatus
   |  |     |     |  |-- C. c. tricarunculatus
   |  |     |     |  |-- C. c. lateralis
   |  |     |     |  |-- C. c. sclaterii
   |  |     |     |  |-- C. c. aruensis
   |  |     |     |  |-- C. c. violicollis
   |  |     |     |  `-- C. c. johnsonii
   |  |     |     |--o C. unappendiculatus Blyth, 1860 (yksipussikasuaari)
   |  |     |     |  |-- C. u. rothschildi
   |  |     |     |  |-- C. u. philipi
   |  |     |     |  |-- C. u. unappendiculatus
   |  |     |     |  |-- C. u. occipitalis
   |  |     |     |  |-- C. u. rufotinctus
   |  |     |     |  `-- C. u. aurentiacus
   |  |     |     `--o C. bennetti Gould, 1858 (bennettinkasuaari)
   |  |     |        |-- C. b. papuanus Schlegel, 1871
   |  |     |        |-- C. b. goodfellowi
   |  |     |        |-- C. b. claudii
   |  |     |        |-- C. b. hecki
   |  |     |        |-- C. b. picticollis
   |  |     |        |-- C. b. bennetti
   |  |     |        `-- C. b. shawmayeri
   |  |     `--o Dromaiidae Richmond, 1908 (emus; emut)
   |  |        `--o Dromaius Vieillot, 1816 (emut)
   |  |           |-- †D. ocypus (AH Miller,, 1963) [Casuarius ocypus AH Miller, 1963] L. Plio. Aust.
   |  |           |-- †D. ater Vieillot, 1817 [=? †D. minor] (black emu; mustaemu)
   |  |           |-- †D. baudinianus Parker, 1984 (kengurusaarenemu)
   |  |           `--o D. novaehollandiae (Latham, 1790) (emu)
   |  |              |-- †D. n. diemenensis Le Souef, 1907
   |  |              |-- D. n. woodwardi
   |  |              |-- D. n. rothchildi (Mathews, 1912)
   |  |              `-- D. n. novaehollandiae (Latham, 1790)
   |  `?-o Apterygimorphae Livezey & Zusi, 2007 (“New Zealandic paleognaths”)
   |     |?-o Apterygiformes (Haeckel, 1866) (kiwis; kiivilinnut)
   |     |  `--o Apterygidae Gray, 1840 (kiwis; kiivit)
   |     |     `--o Apteryx Shaw, 1813 (kiivit)
   |     |        |--o A. australis Shaw, 1813 (ruskokiivi)
   |     |        |  |-- A. a. australis Shaw, 1813
   |     |        |  `-- A. a. lawryi Rothschild, 1893
   |     |        |-- A. mantelli Bartlett, 1852
   |     |        |-- A. owenii Gould, 1847 (pikkukiivi)
   |     |        `-- A. haastii Potts, 1872 (kirjokiivi)
   |     `?-o †Dinornithiformes (Gadow, 1893) (moas; moalinnut)
   |        |--o †Dinornithidae (Owen, 1843) (great moas; isomoat)
   |        |  `--o †Dinornis Owen, 1843 [taxonomic history] (great moas; isomoat)
   |        |     |-- †D. novaezealandiae Owen, 1843 [taxonomic history] (North Island great moa)
   |        |     `-- †D. robustus Owen, 1846 [taxonomic history] (South Island great moa)
   |        `--o †Emeidae [Anomalopterygidae (Archey, 1941)] (lesser moas; pikkumoat)
   |           |--o †Emeinae
   |           |  |-- †Emeus crassus [incl. E. huttonii]
   |           |  `--o †Euryapteryx
   |           |     |-- †E. curtus [incl. †E. exilis]
   |           |     |?- †E. geranoides
   |           |     `?- †E. gravis
   |           `--o †Anomalopteryginae (Archey, 1941)
   |              |-- †Megalapteryx didinus [incl. M. benhami]
   |              |-- †Anomalopteryx didiformis [incl. A. oweni]
   |              `--o †Pachyornis
   |                 |-- †P. elephantopus
   |                 |?- †P. australis Oliver
   |                 `-- †P. mappini [incl. P. septentrionalis]
   `--+?-o “South American paleognaths”
      |  |?-o Tinamiformes (Huxley, 1872) [Crypturi Goodchild, 1891: Dromaeomorphae (Huxley, 1867):] (tinamous; tinamilinnut)
      |  |  `-- Tinamidae Gray, 1840 (tinamous; tinamit)
      |  `?-o Rheiformes (nandus; nandulinnut)
      |     |--o †Opisthodactylidae Ameghino, 1895 [possibly synonymous to Rheidae]
      |     |  |?- †Diogenornis fragilis Alvarenga, 1983: U. Pal. SSA.
      |     |  `-- †Opisthodactylus patagonicus Ameghino, 1895; U. Mioc. SSA.
      |     `--o Rheidae (Bonaparte, 1853) (rheas; nandut)
      |        |-- †Heterorhea dabbenei Rovereto, 1914; U. Plio. SSA.
      |        |-- †Hinasuri nehuensis Ameghino, 1891; U. Plio. SSA.
      |        `--o Rhea Brisson, 1760 [incl. Pterocnemia GR Gray, 1870]
      |           |--o R. americana (Linnaeus, 1758) (Greater Rhea; amerikannandu)
      |           |  |-- R. a. albescens Lynch & Holmberg, 1878
      |           |  |-- R. a. americana (Linnaeus, 1758)
      |           |  |-- R. a. araneipes Brodkorb, 1938
      |           |  |-- R. a. intermedia Rothschild & Chubb, 1914
      |           |  `-- R. a. nobilis Brodkorb, 1939
      |           `--o R. pennata d'Orbigny, 1834 [Rhea darwinii Gould, 1837] (Lesser Rhea; patagoniannandu)
      |              |-- R. p. garleppi (Chubb, 1913)
      |              |-- R. p. pennata d'Orbigny, 1834 (Darwin's Rhea; darwininnandu)
      |              `-- R. p. tarapacensis (Chubb, 1913) (Puna Rhea; punannandu)
      `?-o Struthionimorphae Livezey & Zusi, 2007 (“Laurasian & African paleognaths”)
         |?- †Remiornis minor [Remiornithiformes: Remiornithidae] [Palaeognathia incertae sedis]
         |?-o †Lithornithiformes
         |  `--o †Lithornithidae
         |     |-- †Pseudocrypturus cercanaxius
         |     |-- †Paracathartes howardae
         |     |-- †Promusophaga magnifica Harrison & Walker, 1977
         |     `--o †Lithornis
         |        |-- †L. celetius
         |        `--+-- †L. plebius
         |           |-- †L. promiscuus
         |           |-- †L. nasi
         |           |-- †L. hookeri
         |           `-- †L. vulturinus
         |?-o †Aepyornithiformes (Newton, 1884) (elephantbirds; norsulinnut)
         |  `--o †Aepyornithidae Bonaparte, 1853 (elephantbirds; norsulinnut)
         |     |?- †Paraphysornis brasiliensis
         |     |?- †Mullerornis betsilei
         |     `--o †Aepyornis (elephantbirds; norsulinnut)
         |        |-- †A. sp.1
         |        |-- †A. sp.2
         |        |-- †A. sp.3
         |        |-- †A. sp.4
         |        |-- †A. medius
         |        |-- †A. hildebrandti
         |        `-- †A. maximus
         `?-o Struthioniformes (Latham, 1790) (ostrichies; strutsilinnut)
            `--o Struthionidae Vigors, 1825 (ostriches; strutsit)
               |?- ?†Palaeotis weigelti [Palaeogrus geiseltalensis Lambrecht, 1935] M. Eoc. CEu.
               `--o Struthio Linnaeus, 1758 (ostriches; strutsit)
                  |-- †S. orlovi
                  |-- †S. brachydactylus
                  |-- †S. wimani
                  |-- †S. chersonensis
                  |-- †S. asiaticus
                  |-- S. molybdophanes Reichenow, 1883 (Masai ostrich; masaistrutsi)
                  `--o S. camelus Linnaeus, 1758 (ostrich; strutsi)
                     |-- S. c. australis Gurney, 1868 (South African ostrich; eteläafrikanstrutsi)
                     |-- †S. c. syriacus Rothschild, 1919 (arabianstrutsi)
                     |-- S. c. camelus Linnaeus, 1758 (afrikanstrutsi)
                     `-- S. c. massaicus Neumann, 1898 (masaistrutsi 2)

After Sibley & Ahlquist, 1990

<==o Eoaves [Paleognathe; Paleognathia]
   |-- Galloanserae
   `--o Ratitae
      |--o Tinamiformes
      |  `-- Tinamidae
      `--o Struthioniformes
         |--o Struthioni
         |  |--o Struthionides
         |  |  `-- Struthionidae
         |  `--o Rheides
         |     `-- Rheidae
         `--o Casuarii
            |-- Apterygidae
            `--o Casuariidae
               |-- Casuariini
               `-- Dromaiini

After Haddrath & Baker, 2001

<==o Paleognathia
   |?- †Lithornithiformes
   |?- †Aepyornithiformes
   |-- Tinamiformes
   `--+-- †Dinornithiformes
      `--+-- Rheiformes
         `--+-- Struthioniformes
            `--+-- Apterygiformes
               `-- Casuariformes

After Livezey & Zusi, 2007

<==o Paleognathae
   |--o Crypturi
   |  `--o Dromaeomorphae
   |     `--o Tinamiformes
   |        `-- Tinamidae
   `--o Ratitae
      `==o Apterygimorphae
         |--o Apterygiformes
         |  `-- Apterygidae
         `--+--o †Dinornithiformes
            |  |-- †Anomalopterygidae
            |  `-- †Dinornithidae
            `--+--o Casuariimorphae
               |  `--o Casuariformes
               |     |-- Casuariidae
               |     `-- Dromaiidae
               `--o Struthionimorphae
                  `--+--o †Aepyornithiformes
                     |  `-- †Aepyornithidae
                     `--o Struthioniformes
                        |-- Struthionidae
                        `-- Rheidae

Note:

Species of moa, and particulary genus Dinornis seems to have unusually large sexual dimorphism, which has caused different morphs to be classified as separate species (Worthy, 1994). Recent articles of Bunce et al (2003) and Huynen et al (2003) has demostrated this by using molecular methods of taxonomy. Because only the genus Dinornis was revisited, I have not chanced the status of other species of moas. [MKH, 2005]

 

Reference(s):