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Acre Antshrike Thamnophilus divisorius
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Although this species may have a restricted range, it is not believed to approach the thresholds for Vulnerable under the range size criterion (Extent of Occurrence <20,000 km2 combined with a declining or fluctuating range size, habitat extent/quality, or population size and a small number of locations or severe fragmentation). The population trend appears to be stable, and hence the species does not approach the thresholds for Vulnerable under the population trend criterion (>30% decline over ten years or three generations). The population size has not been quantified, but it is not believed to approach the thresholds for Vulnerable under the population size criterion (<10,000 mature individuals with a continuing decline estimated to be >10% in ten years or three generations, or with a specified population structure). For these reasons the species is evaluated as Least Concern.

Taxonomic source(s)
SACC. 2006. A classification of the bird species of South America. Available at: #

Distribution and population
This species was recently described from within the Parque Nacional da Serra do Divisor, Acre, Brazil. This large and relatively well protected area contains the sole known locality for this species, the Serra da Jaquirana, the easternmost of a series of narrow ridges in the Serra do Divisor, part of the Acre Arch. It may occur on physiognomically similar ridges within the Acre Arch perhaps extending to the continuous Aierra Contamana in Ucayali, Peru. Given that the species is conspicuous, the lack of records from structurally favourable "Amazon Caatinga" habitats c. 100 km east-southeast of the type locality suggests it is absent from that area.

Population justification
The global population size has not been quantified, but the species is believed to be common despite its restricted known range.

Trend justification
This population is suspected to be stable in the absence of evidence for any declines or substantial threats.

The species favours stunted ridge woodlands with a broken canopy and thick understorey growing on very thin soils.

Whitney, Bret M.; Oren, David C. & Brumfield, Robb T. 2004. A new species of Thamnophilus Antshrike (Aves: Thamnophilidae) from the Serra do Divisor, Acre, Brazil. Auk 121(4): 1031-1039.

Further web sources of information
Explore HBW Alive for further information on this species

Search for photos and videos, and hear sounds of this species from the Internet Bird Collection

Text account compilers
Butchart, S., Bird, J.

IUCN Red List evaluators
Butchart, S., Symes, A.

Recommended citation
BirdLife International (2016) Species factsheet: Thamnophilus divisorius. Downloaded from on 26/10/2016. Recommended citation for factsheets for more than one species: BirdLife International (2016) IUCN Red List for birds. Downloaded from on 26/10/2016.

This information is based upon, and updates, the information published in BirdLife International (2000) Threatened birds of the world. Barcelona and Cambridge, UK: Lynx Edicions and BirdLife International, BirdLife International (2004) Threatened birds of the world 2004 CD-ROM and BirdLife International (2008) Threatened birds of the world 2008 CD-ROM. These sources provide the information for species accounts for the birds on the IUCN Red List.

To provide new information to update this factsheet or to correct any errors, please email BirdLife

To contribute to discussions on the evaluation of the IUCN Red List status of Globally Threatened Birds, please visit BirdLife's Globally Threatened Bird Forums.

Key facts
Current IUCN Red List category Least Concern
Family Thamnophilidae (Antbirds)
Species name author Whitney, Oren & Brumfield, 2004
Population size Unknown mature individuals
Population trend Stable
Distribution size (breeding/resident) 9,800 km2
Country endemic? No
Links to further information
- Additional Information on this species