Ataenius balthasari is a species of beetle of the family Scarabaeidae. It is found in Brazil (Amazonas, Mato Grosso, Roraima).
Description Adults reach a length of about . They are very similar to Ataenius imbricatus, but the head is relatively larger and has a slightly angulate clypeal margin. Furthermore, the disc of the pronotum lacks coating, is slightly shiny and the punctures are less close. Also, the elytra are relatively longer than in imbricatus.
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