Extreme southern Bolivia (south-western Santa Cruz), western Paraguay, northern Argentina (south to eastern La Rioja, northern San Luis, central Córdoba and northern Buenos Aires) and south-western Uruguay.
 
Rarity Status
Currently this species is not classified as a rarity in this country OR information has not been updated.
Population
Estimated population is unknown (2010).
Little Thornbird (Phacellodomus sibilatrix) [XC49927]
by Bernabe Lopez-Lanus from Estancia El Potrero, Gualeguaychu, Entre Rios, Argentina (call)
Little Thornbird (Phacellodomus sibilatrix) [XC364296]
by Bobby Wilcox from Parque Nacional Chaco, Chaco, Argentina (call, song, frogs)
Subspecies
No subspecies.
Considered by some authors to form a superspecies with Rufous-fronted Thornbird (Phacellodomus rufifrons), but the two overlap considerably in distribution, and differ in body size and nest structure.