This is the first study that analyzes the ant fauna of the Humid Chaco ecoregion. We produced an inventory based on a) sampling at different locations in the provinces of Chaco and Corrientes, Argentina, and b) bibliographic records. This inventory comprises 10 subfamilies, 77 genera, and 462 species. Eight of thesespecies are new records for the Humid Chaco ecoregion, and six species are registered for the first time in Argentina. Acanthostichus longinodis, Camponotus fiebrigi, Crematogaster thalia, Eciton mexicanum argentinum,Mycetomoellerius fiebrigi, Strumigenys insolita and Strumigenys siagodensare registered as endemic species of the Humid Chaco ecoregion. Pictorial keys are provided for the 10 subfamilies and 77 genera that inhabit this ecoregion.
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