Ataenius setiger is a species of aphodiine dung beetle in the family Scarabaeidae. It is found in Mexico (Baja California Sur, Guerrero, Morelos, Nayarit, Oaxaca, Puebla, Quintana Roo, San Luis Potosí, Sonora, Tamaulipas, Veracruz) and the United States (Arizona, Texas).
Description Adults reach a length of about . They have an oblong, convex, piceous, moderately shiny body.
Life history Specimens have been collected in open meadows.
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