[3] The French polymath Georges-Louis Leclerc, Comte de Buffon described the Guianan warbling antbird in his Histoire Naturelle des Oiseaux in 1779.

[4] The bird was also illustrated in a hand-colored plate engraved by François-Nicolas Martinet in the Planches Enluminées D'Histoire Naturelle which was produced under the supervision of Edme-Louis Daubenton to accompany Buffon's text.

[5] Buffon did not include a scientific name with his description but in 1783 the Dutch naturalist Pieter Boddaert coined the binomial name Formicarius cantatar in his catalogue of the Planches Enluminées.

[11][12][13] The Guianan warbling antbird is found in Venezuela's Bolívar state, in the Guianas, and in northeastern Brazil from the lower Rio Negro to the Atlantic in Amapá.

It inhabits the edges of terra firme and várzea evergreen forest, the transition zone between them, and adjacent mature secondary woodland.

It forages mostly in dense vegetation such as vine tangles, understorey shrubs, bamboo thickets, and among epiphyte cluster on tree trunks and branches.

It takes most of its prey by reaching or lunging from a perch and also makes short sallies to overhanging vegetation and probes clusters of dead leaves.

[11][12][13] The Guianan warbling antbird's breeding season varies geographically, for example spanning May to October in Suriname and July to November in French Guiana.

Its nest is a deep pouch made of dried or rotting leaves, rhizomorphs, and moss that hangs from a branch.

"The primary threat to this species is deforestation, as land is cleared for cattle ranching and soy production, facilitated by expansion of the road network.