Ataenius californicus is a species of beetle of the family Scarabaeidae. It is found in the United States (Arizona, California, Utah).
Description Adults reach a length of about . They have an elongate-oblong, parallel, shiny rufo-piceous to piceous body, with rufous legs.
Life history Specimens have been collected in animal dung, but have also been recorded feeding on fly larvae and the roots of sugar beets.
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