Ataenius cristobalensis is a species of beetle of the family Scarabaeidae. It is found on the Galapagos Islands (San Cristobal).
Description Adults reach a length of about . They have a moderately convex, shining, dark brown to black body, with the edge of the clypeus and legs dark reddish-brown and the antennae paler.
Life history Specimens have been collected in litter and horse dung.
Etymology The name of the species refers to the island of San Cristobal, where it occurs.
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