Ataenius forsteri is a species of beetle of the family Scarabaeidae. It is found in Argentina, Bolivia, Brazil (Distrito Federal, Espírito Santo, Goiás, Maranhão, Mato Grosso, Mato Grosso do Sul, Minas Gerais, Paraíba, Piauí, Rio de Janeiro, Rio Grande do Norte, Santa Catarina, São Paulo), Paraguay and Venezuela.
Description Adults reach a length of about . They are nearly indentical to Ataenius sculptilis, but lack clypeal denticles and have somewhat larger and less dense punctures on the pronotum and ventral surface.
Life history Specimens have been collected in cattle excrements on pastures.
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