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The study of social wasp biology is often focused on understanding the factors involved in the evolution of social behavior. However, despite the importance of parasitism for the fitness of social insect colonies, little is known about the presence of parasitic protozoan infections in Neotropical social wasp populations. Herein, we report the first recorded occurrence of eugregarines in the midgut of the paper wasp Polistes versicolor. Our study shows 46% of the adults (n = 50) in the studied population were infected with gregarine trophozoites. No protozoans were identified in any of the sampled larvae (n = 14). This new record may indicate the existence of a new taxon within Order Eugregarinorida. [ABSTRACT FROM AUTHOR]