The Black-capped Donacobius is the only member of the genus Donacobius.

The Black-capped Donacobius is an enigmatic species traditionally placed with the wrens more for lack of a more apparent alternative and/or thorough study.

Donacobius: Black-capped Donacobius.

Donacobiidae: the Black-capped Donacobius; previously classed as a wren but probably closest to the Megaluridae or Bernieridae.

The Black-capped Donacobius Donacobius atricapillus, which was long considered an aberrant wren or mockingbird is apparently quite closely related, and might possibly be considered the only American species of this family.

Bradypterus, the megalurid bush-warblers, belong to in the Megaluridae, the grass-warbler family which is closely related to the Malagasy warblers and the peculiar Black-capped Donacobius from South America, formerly believed to be an aberrant wren.

The Black-capped Donacobius (Donacobius atricapilla) is a conspicuous, vocal South American bird.