Ataenius stephani is a species of aphodiine dung beetle in the family Scarabaeidae. It is found in the United States (Arizona) and Mexico (Baja California, Jalisco, Nayarit, Sinaloa, Sonora).
Description Adults reach a length of about . They have an oblong, shiny, black body, with the legs and sometimes the margins of the pronotum reddish brown.
Life history Specimens have been collected in riparian habitats and is common in lawns.
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