Neornithes Gadow, 1893 - living birds
   Neognathae Pycraft 1900 see Cohort Neognathae Pycraft, 1900
     Neoaves Sibley et al. 1988 see Subcohort Neoaves Sibley et al., 1988
       Order [Psittaciformes] Wagler, 1830 [monotypic] - parrots
         Family Psittacidae Illiger, 1811 - cockatoos and parrots
           Subfamily Psittacinae Illiger, 1811 - typical parrots
             Tribe Arini Gray, 1840
               Genus Forpus Boie, 1858
                 Forpus sclateri (Gray, 1859) - dusky-billed parrotlet see Forpus modestus (Cabanis, 1848)
                   1 Forpus sclateri eidos Peters, 1937 see Forpus modestus modestus (Cabanis, 1848)
                   2 Forpus sclateri sclateri (Gray, 1859) see Forpus modestus sclateri (Gray, 1859)