Diomus tasmanicus is a species of beetle of the family Coccinellidae. It is found in Australia (Tasmania).
Description Adults reach a length of about . The head, antennae and legs are yellowish brown, while the pronotum and elytra are dark brown to almost black. The dorsal surface is covered by yellowish pubescence, forming a wavy pattern on the elytra.
Etymology The species name is derived from the state of Tasmania.
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