Rhyzobius fagus is a species of beetle of the family Coccinellidae. It is found in Australia (New South Wales, Australian Capital Territory, Queensland, King Island, Norfolk Island, Phillip Island), New Caledonia, New Zealand, Tonga, as well as Africa.
Description Adults reach a length of about . They have a broadly oval, strongly convex body. They are black with the antennae yellowish-brown. The pubescence on the dorsum consists of appresed setae and dark stiff bristles, forming a wavy pattern on the elytra.
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