Extreme eastern Paraguay, south-eastern Brazil (southern Minas Gerais and Espírito Santo south to Santa Catarina) and north-eastern Argentina (Misiones).
 
Population
Estimated population is unknown (2010) and decreasing.
Status NT
Habitat destruction and degradation through urbanisation, industrialisation, agricultural expansion, colonisation and associated road-building, are the main threats.
For more information see BirdLife International Species Factsheet.
Bay-ringed Tyrannulet (Phylloscartes sylviolus) [XC582864]
by Dante Buzzetti from Parque Estadual Intervales, Guapiara, S\u00e3o Paulo, Brazil (call, subsong)
Bay-ringed Tyrannulet (Phylloscartes sylviolus) [XC81672]
by GABRIEL LEITE from Intervales State Park. Carmo road, Brazil (song)