The blue-black grassquit (Volatinia jacarina) is a small Neotropical bird in the family Thraupidae, the tanagers and allies. It is found in Mexico, every Central American country, every mainland South American country, in Trinidad and Tobago, and in Grenada.
The blue-black grassquit was formally described by the Swedish naturalist Carl Linnaeus in 1766 in the twelfth edition of his Systema Naturae under the binomial name Tanagra jacarina. Linnaeus based his description on the "Jacarni" that was described in 1648 by the German naturalist Georg Marcgrave in his Historia Naturalis Brasiliae. The type locality is eastern Brazil. The specific epithet jacarina is derived from the Tupi language and was used for a type of finch. The blue-black grassquit is now the only species in the genus Volatinia that was introduced in 1850 by the German naturalist Ludwig Reichenbach. The genus name is a diminutive of the Latin volatus meaning "flying".
Within the tanager family Thraupidae the blue-black grassquit is in the subfamily Tachyphoninae and is a member of a clade that contains the genera Conothraupis and Creurgops. It was formerly placed with the buntings in the...