Golden-sided euphonia

The golden-sided euphonia (Euphonia cayennensis) is a species of bird in the family Fringillidae. It is found in northern Brazil, French Guiana, Guyana, Suriname and eastern Venezuela. Its natural habitat is subtropical or tropical moist lowland forest.

Taxonomy
The golden-sided euphonia 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 in the genus Tanagra and coined the binomial name Tanagra cayennensis. Gmelin's account was based on "Le tangara noir de Cayenne" that had been described in 1760 by the French ornithologist Mathurin Brisson from a specimen that had been collected in French Guiana. The golden-sided euphonia is now placed in the genus Euphonia  that was introduced in 1806 by the French zoologist Anselme Desmarest. The species is monotypic: no subspecies are recognised.