Ataenius koelleri is a species of beetle of the family Scarabaeidae. It is found in Bolivia, Brazil (Bahia, Distrito Federal, Mato Grosso, Pernambuco, Rondônia), Colombia, Panama, Paraguay, Suriname and Venezuela.
Description Adults reach a length of about . They have an oblong-oval, moderately convex, strongly shiny, piceous black body, with the anterior of the clypeus and legs reddish.
Life history Specimens have been collected in wet montane forests.
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