Sibilant Sirystes (Sirystes sibilator) [XC229756]
by Roney Souza from Itapo\u00e1 - Volta Velha, Santa Catarina, Brazil (song)
Sibilant Sirystes (Sirystes sibilator) [XC571651]
by Ciro Albano from Zool\u00f3gico Municipal de Guarulhos, Guarulhos, S\u00e3o Paulo, Brazil (song)
Subspecies
Affinities obscure. Placed by early authors in the family Cotingidae, but internal morphology (syrinx, nasal capsule) and nesting behaviour indicate that it is allied with "myiarchine" flycatchers in the genera Rhytipterna, Casiornis and Myiarchus. Subspecies albogriseus sometimes treated as a separate species, differing in plumage and vocalizations.
The following 5 subspecies are recognised:
albogriseus (Vieillot, 1818) - Eastern Panama; north-western Colombia (Chocó, eastern Antioquia, Córdoba) and north-western Ecuador (locally in western Esmeraldas, southern Pichincha and northern Manabí). Considered by some authors to be a distinct species, Choco Sirystes (Sirystes albogriseus).
albocinereus P. L. Sclater and Salvin, 1880 - South-western Venezuela (western Barinas, Táchira), eastern Colombia (locally to near base of Andes), eastern Ecuador, eastern Peru, western Brazil and northern Bolivia (south to La Paz, Cochabamba and northern Santa Cruz). Considered by some authors to be a distinct species, White-rumped Sirystes (Sirystes albocinereus).
subcanescens Todd, 1920 - Surinam, French Guiana and eastern Amazonian Brazil (east to Maranhío, south to Mato Grosso and northern Goiás). Considered by some authors to be a distinct species, Todd's Sirystes (Sirystes subcanescens).
atimastus Oberholser, 1902 - Chapada, in Mato Grosso (Brazil).
sibilator (Vieillot, 1818) - Eastern and south-eastern Brazil (Goiás and Bahia south to Rio Grande do Sul), eastern Paraguay (eastern from Amambay and Paraguarí) and north-eastern Argentina (Misiones, north-eastern Corrientes).
BirdLife International Species Factsheet