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The bay-chested warbling finch (Castanozoster thoracicus) is a species of bird in the family Thraupidae. It is endemic to southeastern Brazil.

Its natural habitats are temperate forests and subtropical or tropical moist montane forests.

Taxonomy

The bay-chested warbling finch was formally described in 1835 by the Finnish naturalist Alexander von Nordmann from a specimen collected in Brazil. He coined the binomial name Frigilla thoracica. This species was traditionally placed in the genus Poospiza. A molecular phylogenetic study published in 2014 found that the genus was polyphyletic. In the subsequent reorganisation the bay-chested warbling finch was moved to its own newly erected genus Castanozoster. The name combines the Ancient Greek ?asta?? meaning "chestnut" with ??st?? meaning "belt". The bay-chested warbling finch is monotypic: no subspecies are recognised.