Ataenius cognatus, the slender dung beetle, is a species of aphodiine dung beetle in the family Scarabaeidae. It is found in the United States (Arizona, California, Indiana, Florida, Iowa, Kansas, Louisiana, Mississippi, Missouri, Oklahoma, Texas) and Mexico (Coahuila, Nuevo León, San Luis Potosí, Sonora, Tamaulipas).
Description Adults reach a length of about . They have an elongate-oblong, shiny black body, with the legs usually reddish-black.
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