The Masafuera Rayadito is a small Furnariid endemic to Alejandro Selkirk Island (formerly Más Afuera Island) in the Juan Fernandez group off Chile. It resembles the only other species in its genus, the Thorn-tailed Rayadito (A. spinicauda) of the mainland of southern South America. The Masafuera is slightly larger, longer-billed and duller than the Thorn-tailed. This species is found in pairs in scrub and undergrowth, often near streams, at higher elevations. It is active and acrobatic in its search for arthropods. The nest is placed in a rock cavity well above the ground. This species is a major conservation concern, largely because of its restricted range and small population size.