Diomus tinaroo is a species of beetle of the family Coccinellidae. It is found in Australia (northern Queensland).
Description Adults reach a length of about . The head and pronotum are yellowish to light brown, while the elytra are light to dark brown with the sutural region a bit lighter. The dorsal surface is covered by yellowish pubescence forming a pattern of transverse bands on the elytra.
Etymology The species name refers to the Tinaroo Creek in Queensland.
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