Avian haemosporidian parasites (Order: Haemosporida) are a diverse group of microorganisms that spend part of their life cycle in the erythrocytes of avian hosts. Parasite presence has been confirmed in all Ecuadorian regions, but some ecosystems, such as the deciduous dry forest of the Coastal region, have not been evaluated for parasite presence. Data on presence or absence, and prevalence, of haemosporidian blood parasites were obtained from avian blood samples collected in two different dry deciduous forests in Guayaquil, Ecuador: Bosque Protector Prosperina and Área Nacional de Recreación Parque Lago. Mist netting was performed between December 2018 and September 2019; blood smears were prepared from blood taken from 35 individuals of 20 bird species and all samples were analyzed by optical microscope observation. Most species showed no evidence of parasite infection, but haemosporidia were found on a blood smear obtained from a Black-capped Sparrow, Arremon abeillei (Passerelleidae), confirming this species as a newly discovered host of blood parasites.

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