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) [XC275874]
by Bruno Renn\u00f3 from Sucumb\u00edos: 'Sacha Lodge', n bank R\u00edo Napo, Ecuador (call, calls)
Casqued Oropendola (Cacicus oseryi) [XC566890]
by Renzo P. Piana from Parque Estadual Chandless, Santa Rosa do Purus, Acre, Brazil (call)
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.