Neorhyssemus quinquecostatus is a species of beetle of the family Scarabaeidae. It is found in Brazil (Amazonas, Mato Grosso).
Description Adults reach a length of about . The clypeus is emarginate and the frontoclypeal suture is furrowed and sinuate. The transverse ridges on the pronotum are widely separated with a second transverse ridge not interrupted medially. The longitudinal ridges are joined anteriorly. The elytra have thick costae.
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