Stethorus pusillus, known generally as the lesser mite destroyer or spider mite destroyer, is a species of beetle of the family Coccinellidae. It is found in Japan (Hokkaido, Honshu, Shikoku, Kyushu), on the Kuril Islands and the Korean Peninsula, as well as in north-eastern and central China, Mongolia, Central Asia, western Asia, the Caucasus, Europe, North Africa, North America and Eurasia.

Description Adults reach a length of about . They have a black body, while the antennae, mouthparts and legs are brownish yellow.

Life history They prey on tetranychid mites.

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