South-eastern Peru (Cuzco, Madre de Dios), northern and eastern Bolivia (north-western La Paz, Beni, northern Santa Cruz) and south-central and eastern Brazil (locally in southern Amazonia from Amazonas east to R Tapajós, and Mato Grosso east to Ceará, Alagoas, northern Bahia and western Minas Gerais).
Population
Estimated population is unknown (2010).
Cinereous-breasted Spinetail (Synallaxis hypospodia) [XC296925]
by JAYRSON ARAUJO DE OLIVEIRA from Estancia San Francisco, Bolivia (song)
Cinereous-breasted Spinetail (Synallaxis hypospodia) [XC844085]
by Jacob Wijpkema from Lagoa dos Gatos, Pernambuco, Brazil (?)
Subspecies
No subspecies.
Was in the past considered a subspecies of Spix's Spinetail (Synallaxis spixi). The two are thought to be possibly sister-species by some authors, but others consider them not closely related because of differences in tail morphology, throat pattern and voice. Named taxon jaraguana from eastern Brazil (Goiás), described as a subspecies of Slaty Spinetail (Synallaxis brachyura), was based on misidentified specimens of present species.
BirdLife International Species Factsheet