Published sources disagree regarding the precise distribution: Thorington & Hoffman state it is found south of the Orinoco from the Colombian border to Ciudad Bolívar at the confluence of the Río Caroní into the Orinoco (thus east of the Caroní),[2] whereas de Vivo & Carmignotto give it south of the Orinoco and to the west of the Río Caroní to the Guyana border, to the Brazilian border at the Serra de Pacaraima.

[3] Both may be correct; specimens have been collected in the municipalities of Cedeño (Caura River near La Union, Mocho River, Suapure), Gran Sabana (19 Km NE Icabaru in the Pacaraima), Heres (Ciudad Bolívar), and Sucre (El Yagual).

[5] It is likely found in closed-canopy lowland rainforest, either primary old-growth woodland as well as disturbed secondary growth, in the southern part of the upper Orinoco drainage.

igniventris; diurnal, territorial and solitary, arboreal and found at all heights from canopy to ground level, building large and well-hidden spherical nests in trees, and feeding on the large nuts of Attalea palm, as well as other tree nuts, fruit, and beetle grubs.

igniventris, which occurs to the south and east of its range and is most similar to it, is distinguished by having a red abdomen and lacking conspicuous lighter-coloured patches of fur behind the ears.

[4] In the latest assessment for the IUCN by Amori, Koprowski & Roth in 2008 the largely unknown taxon was given a Data Deficient rating, although they mention their concern due to its restricted range and the effects of deforestation.