A scythebill occurring in the lowland Amazon of Brazil. The appearance and foraging details here apply only to subspecies cardosoi under the current treatment.
The female holotype described in the 2013 original paper had a black forehead, lores, crown, and upper neck marked with buff streaks. Its mantle was dark brownish olive with conspicuous buff streaks edged in black. The chest had arrow-shaped buff streaks with thin black edges, and the upper belly was cinnamon-brown.
The population described as C. cardosoi, now subspecies C. probatus cardosoi, was recorded foraging alone or in pairs in the understory and midstory of terra firme forest, often along creeks. It was reported to forage almost always with mixed-species flocks, gleaning arthropods from tree bark and sometimes probing dead bamboo or trunks for prey.
An extinction-risk assessment has not been added yet.