Rhyzobius atramentarius 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, dorsally strongly convex, hemispherical body. They are black or blackish brown, predominantly with a bluish metallic sheen. The antennae are brown. The dorsum has double pubescence consisting of appressed setae and sparse darker stiff bristles. The dorsal pubescence forms a weak wavy pattern on the elytra and sparse elytral bristles are present on the lateral margins and apices only.
Etymology The species name is the Latin word for inky and refers to the body colouration.
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