Diomus inaffectatus is a species of beetle of the family Coccinellidae. It is found in Australia (Victoria, Tasmania, southern New South Wales).
Description Adults reach a length of about . The head, antennae, legs, pronotum and abdomen are yellowish, while a medio-basal spot on the pronotum, the rest of the ventral side and the elytra are dark brown to black. The dorsal surface is shiny and covered by yellowish pubescence, forming a wavy pattern on the elytra.
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