Introduction: The occurrence of Triatoma sordida in the Brazilian Western Amazon is reported for the first time.
Methods: Triatoma sordida specimens were collected from a Gallus gallus nest in a peridomiciliary area of Senador Guiomard municipality in the state of Acre.
Results: The number of triatomine species in Acre increased from six to seven with this first report of T. sordida in the Brazilian Western Amazon.
Conclusions: The occurrence of T. sordida in Acre is of concern since it is among the most captured triatomines in peridomiciliary environments in Brazil, and carries a high potential for vector transmission.