Other Scientific Names
Psarocolius oseryi [BirdLife International (2004)], Psarocolius oseryi [Sibley and Monroe (1990, 1993)], Psarocolius oseryi [Stotz et al. (1996)]
Western Amazonia from eastern Ecuador (Sucumbios) and south-eastern Colombia (Amazonas) south to eastern Peru, western Brazil (western Amazonas, Acre) and northern Bolivia.
 
Population
Estimated population is unknown (2010).
Casqued Oropendola (Cacicus oseryi) [XC566890]
by Renzo P. Piana from Parque Estadual Chandless, Santa Rosa do Purus, Acre, Brazil (call)
Casqued Oropendola (Cacicus oseryi) [XC207893]
by id from Manu Wildlife Center, Man\u00fa Province, Madre de Dios, Peru (call, song)
Subspecies
No subspecies.
Genus formerly subsumed in Psarocolius, but mitochondrial DNA indicates that this species belongs to a separate clade together with Band-tailed Oropendola (Cacicus latirostris). As its morphology is quite different from that of Band-tailed Oropendola (Cacicus latirostris), a generic separation is recognized.