Tanygnathus Wagler, 1832

Braun, Michael P., Datzmann, Thomas, Arndt, Thomas, Reinschmidt, Matthias, Schnitker, Heinz, Bahr, Norbert, Sauer-Gürth, Hedwig & Wink, Michael, 2019, A molecular phylogeny of the genus Psittacula sensu lato (Aves: Psittaciformes: Psittacidae: Psittacula, Psittinus, Tanygnathus, † Mascarinus) with taxonomic implications, Zootaxa 4563 (3), pp. 547-562 : 558

Tanygnathus Wagler

Type species: Tanygnathus macrorhynchus Wagler = Psittacus megalorynchos Boddaert

Morphology/distribution: no red shoulder patch; medium to large size; very large bills; medium sized, rounded tails; sexual dimorphism weak or absent; yellow edging on wing coverts; black lore and blue crown only in T. gramineus , otherwise predominantly green head, red upper and lower mandible, juveniles duller. Distribution only on islands of the Philippines and Wallacea.

The genus Tanygnathus clusters within the former genus Psittacula with high support values. Tanygnathus forms a clade with Psittacula s.s. and Belocercus . Its morphological characters (bill size, tail length and shape, no sexual dimorphism in two of the four species) apparently evolved quite quickly away from the general pattern in Psittacula . The monophyletic clade of T. megalorynchos and T. sumatranus clusters together with Psittinus , Belocercus longicauda , and the Psittacula s.s. clade in our dataset..