Graydidascalus brachyurus (Short-tailed Parrot)
Graydidascalus brachyurus, the Short-tailed Parrot, is the only species of the genus Graydidascalus and is found along both sides of the Amazon river in Brazil, Colombia, Ecuador and Peru. The closest relative is the Yellow-faced Parrot (Salvatoria xanthops) and the members of the genus Pionus. 
The species is considered safe at the moment.
- BirdLife International (2004). Graydidascalus brachyurus. 2006 IUCN Red List of Threatened Species. IUCN 2006. Retrieved on 09 May 2006. Database entry includes justification for why this species is of least concern
- Duarte JMB and Caparroz R (1995) Cytotaxonomic analysis of Brazilian species of the genus Amazona (Psittacidae, Aves) and confirmation of the genus Salvatoria (Ribeiro, 1920). Braz J Genet 18:623-628.
- Russello, M.A. & Amato, G (2004) A molecular phylogeny of Amazona: implications for Neotropical parrot biogeography, taxonomy, and conservation. Mol. Phylogenet. Evol. 30: 421-437.