Rhyzobius violaceus is a species of beetle of the family Coccinellidae. It is found in Papua New Guinea.
Description Adults reach a length of about . They have a broadly oval, strongly convex body. The head, pronotum and apex of the elytra are orange brown, while the rest of the elytra is black with a violet metallic sheen. The pubescence on the dorsum consists of appresed setae and sparse darker stiff bristles.
Etymology The name of the species refers to the violet sheen on the elytra.
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