Common Scale-backed Antbird © surinamebirds.nl

Possibly not closely related to other members of genus. Relationships uncertain, but may prove to be part of an obligate ant-following clade. Scientific name often spelt erroneously as poecilonota. Some subspecies possibly constitute separate species and other subspecies appear to intergrade. Major taxonomic study is under way.

The following 7 subspecies are recognised:

• poecilinotus (Cabanis, 1847)   -  Central and south-eastern Venezuela (Bolí­var, northern Amazonas), the Guianas and north-eastern Amazonian Brazil (Roraima and east from lower R Negro to Amapá).
• duidae (Chapman, 1923)   -  East-central Colombia (Meta, Guianí­a, Vaupés), south-western Venezuela (southern Amazonas) and north-western Brazil (upper and western bank of lower R Negro).
• lepidonota (Sclater, PL & Salvin, 1880)   -  South-eastern Colombia (eastern Cauca, Caquetá, Putumayo, Amazonas), eastern Ecuador and northern and east-central Peru (south, west of R Ucayali, to Cuzco).
• gutturalis (Todd, 1927)   -  North-eastern Peru (Loreto south of R Amazon and east of lower R Ucayali) and adjacent western Brazil (east to lower R Juruá).
• griseiventris (Pelzeln, 1868)   -  East-central and south-eastern Peru (Ucayali east of middle R Ucayali, Madre de Dios, eastern Puno), south-western Amazonian Brazil (east from R Juruá to both banks of R Madeira and drainage of R Aripuaní, Rondônia, and western Mato Grosso west of R Teles Pires) and northern Bolivia (Pando, La Paz, northern Beni, north-eastern Santa Cruz).
• nigrigula (Snethlage, 1914)   -  South-central Amazonian Brazil (extreme eastern Amazonas east to both banks of R Tapajós, and on eastern bank of R Teles Pires south to northern Mato Grosso).
• vidua (Hellmayr, 1905)   -  Eastern Amazonian Brazil south of R Amazon (east from R Xingu to western Maranhío, south to northern Tocantins). Considered by some authors to be a distinct species, Xingu Scale-backed Antbird (Willisornis vidua).

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