Ataeniopsis duncani is a species of beetle of the family Scarabaeidae. It is found in the United States (Arizona, California, Colorado, Kansas, New Mexico, Texas) and Mexico (Baja California Sur, Coahuila, Durango, Guanajuato, Sonora).
Description Adults reach a length of about . They have an elongate, parallel, piceous body, with the legs reddish.
Life history They have been collected in Acacia grasslands.
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