Rhyzobius riedeli is a species of beetle of the family Coccinellidae. It is found in Indonesia (Maluku Islands: Halmahera, Morotai).
Description Adults reach a length of about . They have a broadly oval, strongly convex body. They are mostly black, the elytra with a violet metallic sheen. The head (including antennae) and most of the legs are light brown. The dorsum has moderately long pubescence.
Etymology The species is dedicated to Dr. Alexander Riedel, the collector of the type series.
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