Diomus marmorosus is a species of beetle of the family Coccinellidae. It is found in Australia (Queensland, Northern Territory).
Description Adults reach a length of about . The head, most of the pronotum and six spots on each elytron are marble white. There is a dark area on the pronotum. The dorsal surface is covered by silvery pubescence.
Etymology The species name is derived from Latin marmor and refers to the marble like spots on the elytra and pronotum.
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