Phyllastrephus tenebrosus (Stresemann, 1925) The dusky tetraka (Crossleyia tenebrosa) is a species of Old World warbler in the family Bernieridae.

Its natural habitat is subtropical or tropical moist lowland forests.

[1] In 2023, three individuals were discovered in northern Madagascar after it was assumed that the species had gone extinct due to threats to its habitat.

It is one of the ten most endangered bird species in the world.

It was moved to the genus Crossleyia based on a molecular genetic study published online in 2019.