Ataenius cylindrus is a species of beetle of the family Scarabaeidae. It is found in the United States (Alabama, Florida, Kentucky, Louisiana, Maryland, Mississippi, New Yersey, North Carolina, Pennsylvania, South Carolina, Tennessee, Texas, Virginia).
Description Adults reach a length of about . They have an oblong, convex, moderately shining, black body.
Life history Specimens have been collected in half dry cow dung, but also on the dry ground surface under excrements.
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