- Order: Passeriformes
- Family: Thamnophilidae
Reserva Nacional Allpahuayo Mishana, Loreto, Peru; © José Álvarez Alonso
Discovered as recently as the mid 1990s, and named for the famous American botanist Alwyn Gentry, who died in the same plane crash that claimed the life of Ted Parker, the Ancient Antwren occurs in the Marañón, Tigre, Corrientes, Pucacuro, and Pastaza drainages in north-central Peru, and eastern Ecuador, where it is reasonably common and to some extent protected within existing conservation units. Nonetheless, its small range has meant that BirdLife International currently lists the species as Near Threatened. The Ancient Antwren occurs in the canopy and subcanopy of humid tropical forest below 200 m, and is apparently restricted to terra firme forest growing on nutrient-poor soils, as well as on high, dry ridgetops.
. 2010. Ancient Antwren (Herpsilochmus gentryi), Neotropical Birds Online (T. S. Schulenberg, Editor). Ithaca: Cornell Lab of Ornithology; retrieved from Neotropical Birds Online: http://neotropical.birds.cornell.edu/portal/species/overview?p_p_spp=381971