Ataenius pereirai is a species of beetle of the family Scarabaeidae. It is found in Brazil (Bahia, Distrito Federal, Goiás, Mato Grosso, Mato Grosso do Sul, Minas Gerais, Rio de Janeiro, São Paulo, Tocantins).
Description Adults reach a length of about . They have an oblong oval, moderately shining rusty brown body, with the ventral surface yellowish brown.
Life history Specimens have been collected in pastures with Brachiaria decumbens, and have been found in cow dung and in Guzera droppings.
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