After Livezey & Zusi, 2007, and Nesbitt, Ksepka & Clarke, 2011
<==o Pelecanimorphae Huxley, 1867 |?-o Odontopterygiformes (Spulski, 1910) [†Odontopterygia] | `-- †Odontopterygidae Lambrecht, 1933 [Pelagornithidae Fürbringer, 1888] (valehammaslinnut) |--o Balaenicipitiformes (Sclater, 1924) (shoebills; kenkänokat) | `-- Balaenicipitidae (Sclater, 1924) (shoebills; kenkänokat) `--o Pelecaniformes Sharpe, 1891 (pelecans, sulas, anhingas and cormorant & shags; pelikaanilinnut) |--o Phaethontes (Sharpe, 1891) | |-- †Prophaethontidae | `-- Phaethontidae Brandt, 1831 (jouhipyrstöt) `--o Steganopodes (Chandler, 1916) |--o Fregatides (Sharpe, 1891) [Fregatae] | `--o Fregatoidea (Garrod, 1974) | `-- Fregatidae Garrod, 1874 (kaapparit) `--o Pelecanides (Sharpe, 1891) |--o Pelecanida (Sharpe, 1891 sensu Livezey & Zusi, 2007 [Pelecani] | `-- Pelecanidae Vigors, 1825 (pelikaanit) `--o Sulida (Reichenbach, 1849) sensu Livezey & Zusi, 2007 [Sulae] |--o Suloidea (Reichenbach, 1849) | `-- Sulidae (Reichenbach, 1849) (suulat) `--o Phalacorcoracoidea (Bonaparte, 1854) |-- Phalacrocoracidae (Bonaparte, 1854) (merimetsot) `--+-- †Plotopteridae Howard, 1969 (pingviinisuulat) `-- Anhingidae Ridgeway, 1887 (käärmekaulat)
Reference(s):
- Livezey, B. C. & Zusi, R. L., 2007: Higher-order phylogeny of modern birds (Theropoda, Aves: Neornithes) based on comperative anatomy. II. Analysis and discussion.
–Zoological Journal of the Linnean Society: Vol. 149, #1, pp. 1-95