Parastethorus biconvexus is a species of beetle of the family Coccinellidae. It is found in China (Chongqing).
Description Adults reach a length of about . The dorsum and underside are entirely black, except for the yellowish brown antennae, mouthparts and legs.
Etymology The species name is derived from Latin and refers to the two subtriangular protuberances at the apex of the penis guide in ventral view.
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