Imperium naturæ C. Linnaeus, 1758 - nature
   Mundus Plinius - physical world
     naturalia - natural bodies
       Regnum Animale C. Linnaeus, 1758 - animal kingdom see Kingdom Animalia Linnaeus, 1758
         Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758
           Order Picae Linnaeus, 1758 see Parvclass Picae (C. Linnaeus, 1758)
             Genus Psittacus Linnaeus, 1758
               01 Psittacus macao Linnaeus, 1758 see Ara macao (Linnaeus, 1758)
               02 Psittacus ararauna Linnaeus, 1758 see Ara ararauna (Linnaeus, 1758)
               03 Psittacus obscurus Linnaeus, 1758
               04 Psittacus nobilis Linnaeus, 1758 see Diopsittaca nobilis (Linnaeus, 1758)
               05 Psittacus severus Linnaeus, 1758 see Ara severus (Linnaeus, 1758)
               06 Psittacus borneus Linnaeus, 1758 see Eos bornea (Linnaeus, 1758)
               07 Psittacus solstitialis Linnaeus, 1758 see Aratinga solstitialis (Linnaeus, 1758)
               08 Psittacus carolinensis Linnaeus, 1758 see Conuropsis carolinensis (Linnaeus, 1758)
               09 Psittacus alexandri Linnaeus, 1758 see Psittacula alexandri (Linnaeus, 1758)
               10 Psittacus pertinax Linnaeus, 1758 see Aratinga pertinax (Linnaeus, 1758)
               11 Psittacus canicularis Linnaeus, 1758 see Aratinga canicularis (Linnaeus, 1758)
               12 Psittacus aeruginosus Linnaeus, 1758
               13 Psittacus rufirostris Linnaeus, 1758
               14 Psittacus ornatus Linnaeus, 1758 see Trichoglossus ornatus (Linnaeus, 1758)
               15 Psittacus agilis Linnaeus, 1758 see Amazona agilis (Linnaeus, 1758)
               16 Psittacus cristatus Linnaeus, 1758
               17 Psittacus niger Linnaeus, 1758 see Coracopsis nigra (Linnaeus, 1758)
               18 Psittacus sordidus Linnaeus, 1758 see Pionus sordidus (Linnaeus, 1758)
               19 Psittacus erythroleucus Linnaeus, 1758
               20 Psittacus erithacus Linnaeus, 1758 - grey parrot
               21 Psittacus garrulus Linnaeus, 1758 see Lorius garrulus (Linnaeus, 1758)
               22 Psittacus aurorae Linnaeus, 1758
               23 Psittacus domicella Linnaeus, 1758 see Lorius domicella (Linnaeus, 1758)
               24 Psittacus lory Linnaeus, 1758 see Lorius lory (Linnaeus, 1758)
               25 Psittacus caerulocephalus Linnaeus, 1758
               26 Psittacus leucocephalus Linnaeus, 1758 see Amazona leucocephala (Linnaeus, 1758)
               27 Psittacus aestivus Linnaeus, 1758 see Amazona aestiva (Linnaeus, 1758)
               28 Psittacus paradisi Linnaeus, 1758
               29("39") Psittacus festivus Linnaeus, 1758 see Amazona festiva (Linnaeus, 1758)
               30 Psittacus brasiliensis Linnaeus, 1758 see Amazona brasiliensis (Linnaeus, 1758)
               31 Psittacus autumnalis Linnaeus, 1758 see Amazona autumnalis (Linnaeus, 1758)
               32 Psittacus accipitrinus Linnaeus, 1758 see Deroptyus accipitrinus (Linnaeus, 1758)
               33 Psittacus melanocephalus Linnaeus, 1758 see Pionites melanocephalus (Linnaeus, 1758)
               34 Psittacus collarius Linnaeus, 1758 see Amazona collaria (Linnaeus, 1758)
               35 Psittacus pullarius Linnaeus, 1758 see Agapornis pullarius (Linnaeus, 1758)
               36 Psittacus galgulus Linnaeus, 1758 see Loriculus galgulus (Linnaeus, 1758)
               37 Psittacus passerinus Linnaeus, 1758 see Forpus passerinus (Linnaeus, 1758)