Phylum Chordata Bateson, 1885 - chordates
   Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758
     Subclass Neornithes Gadow, 1893 see Clade Neornithes Gadow, 1893
       Superorder Neognathae Pycraft, 1900 see Cohort Neognathae Pycraft, 1900
         Order Pelecaniformes Sharpe, 1891
           Suborder Pelecani Sharpe, 1891 see Infraorder Pelecanides Sharpe, 1891
             Family Sulidae Reichenbach, 1849 - gannets, boobies
               Genus Sula Brisson, 1760
                 1 Sula bassana (Linnaeus, 1758) see Morus bassanus (Linnaeus, 1758)
                 2 Sula capensis Lichtenstein, 1823 see Morus capensis (Lichtenstein, 1823)
                 3 Sula serrator G.R. Gray, 1843 see Morus serrator (Gray, 1843)
                 4 Sula nebouxii Milne-Edwards, 1882 - blue-footed booby
                 5 Sula variegata (Tschudi, 1843) - Peruvian booby
                 6 Sula abbotti Ridgway, 1893 - Abbott's booby see Papasula abbotti (Ridgway, 1893)
                 7 Sula dactylatra Lesson, 1831 - masked booby
                 8 Sula sula (Linnaeus, 1766) - red-footed booby
                 9 Sula leucogaster (Boddaert, 1783) - brown booby