The black-capped bulbul was
formally described in 1789 by the German naturalist
Johann Friedrich Gmelin in his revised and expanded edition of
Carl Linnaeus's
Systema Naturae. He placed it with the flycatchers in the
genus Muscicapa and coined the
binomial name Muscicapa melanictera. The specific epithet combines the
Ancient Greek melas meaning "black" with
ikteros meaning "jaundice-yellow". Gmelin based his description on the "yellow-breasted fly-catcher" from Sri Lanka that had been described and illustrated in 1776 by the English naturalist
Peter Brown. The black-capped bulbul was formerly placed in the genus
Pycnonotus. A
molecular phylogenetic study of the
bulbul family published in 2017 found that
Pycnonotus was
polyphyletic. In the revision to the generic classification the black-capped bulbul and four other species were moved from
Pycnonotus to
Rubigula. Until 2008, the black-capped bulbul was considered as
conspecific with the
black-crested,
ruby-throated,
flame-throated and
Bornean bulbuls. Some authorities have considered the ruby-throated, flame-throated and Bornean bulbuls to be subspecies of the black-capped bulbul. ==Description==