The Sincora antwren[note 1] (Formicivora grantsaui) is a small Endangered Species of passerine bird in subfamily Thamnophilinae of family Thamnophilidae, the "typical antbirds".

[2][1] The Sincora antwren was first described in 2007 from specimens collected near the small town of Mucugê in the state of Bahia, eastern Brazil.

Their crown and upperparts are generally deep brown; the color is grayer on the forehead and brighter on the mantle and scapulars.

Their wing coverts are black with white spots on the ends and their flight feathers are dark brownish gray with thin brown outer edges.

Their face, throat, and underparts are black with deep brown flanks and gray and white underwing coverts.

[5][6] The Sincora antwren is found in the Serra do Sincorá, part of the Espinhaço Mountains located at the eastern edge of the Chapada Diamantina region of Brazil's Bahia state.

It inhabits campo rupestre, a biome characterized by scrub and grasses on poor soil among rocky outcrops, which in the Chapada Diamantina are sandstone.