Subclass Neornithes Gadow, 1893 see Clade Neornithes Gadow, 1893
   Infraclass Neoaves Sibley et al., 1988 see Subcohort Neoaves Sibley et al., 1988
     Parvclass Passerae see Superorder Passerimorphae Sibley et al., 1988
       Superorder Passerimorphae Sibley et al., 1988
         Order Ciconiiformes Bonaparte, 1854
           Suborder Ciconii see Suborder Ciconiae Bonaparte, 1854
             Infraorder Ciconiides see Suborder Ciconiae Bonaparte, 1854
               Parvorder Ciconiida see Suborder Ciconiae Bonaparte, 1854
                 Superfamily Procellarioidea Fürbringer, 1888
                   Family Procellariidae Leach, 1820 - petrels, shearwaters
                     1 Subfamily Hydrobatinae Mathews, 1912
                     2 Subfamily Procellariinae Vigors, 1825 see Family Procellariidae Leach, 1820
                     3 Subfamily Diomedeinae see Family Diomedeidae Gray, 1840