Other Scientific Names
Schoeniophylax phryganophila [BirdLife International (2004)], Schoeniophylax phryganophila [Sibley and Monroe (1990, 1993)], Schoeniophylax phryganophila [Stotz et al. (1996)]
Chotoy Spinetail (Schoeniophylax phryganophilus) [XC686640]
by Franco Vushurovich from Parque Estadual do Esphinillo Barra do Quara\u00ed, Brazil (song)
Chotoy Spinetail (Schoeniophylax phryganophilus) [XC464758]
by Miguel Angelo Biz from Ballesteros Sud, Union, C\u00f3rdoba, Argentina (call)
Subspecies
Similarities in general morphology and nest structure have led some authors to place this species in Synallaxis, but it differs strongly from all members of that genus in voice and plumage pattern. Isolated subspecies petersi evidently differs only in being smaller, but this requires re-evaluation with modern techniques of analysis.
The following 2 subspecies are recognised:
phryganophilus (Vieillot, 1817) - Eastern Bolivia (Beni, Santa Cruz, Tarija), southern Brazil (Mato Grosso do Sul, southern Rio Grande do Sul), Paraguay (except extreme east), north-eastern Argentina (south to Santiago del Estero, Santa Fe and northern Buenos Aires) and Uruguay.
petersi Pinto, 1949 - Eastern Brazil (northern Minas Gerais, western Bahia).