The White-bearded Antshrike (Biatas nigropectus) is a species of bird in the Thamnophilidae family, the only member of the genus Biatas. It is endemic to the Atlantic forest of Argentina and Brazil.
The White-bearded Antshrike is a bamboo specialist. It is threatened by habitat loss.
In Argentina, the White-bearded Antshrike has been found only in Guadua bamboo, especially yatevo (Guadua trinii). It feeds on insects that it gleans from bamboo. It is a cryptic species that rarely sings so very little is known about its ecology.
The White-bearded Antshrike is globally Vulnerable. The main threat to this species is habitat loss from clearing of bamboo.