Most commonly, several of the spots are fused into larger markings, particularly along the midline, where they often create a shape resembling an anchor, sometimes fusing to such an extent that the yellow disappears almost completely, rendering the body almost entirely black except for 12 pale yellow spots.

It is a common species in Europe, North Africa, Cyprus, European Russia, the Caucasus, Siberia, the Russian Far East, Belarus, Ukraine, Moldova, Transcaucasia, Kazakhstan, Western Asia, Pakistan, Mongolia, temperate China (Tarim Basin deciduous forests and steppe), Korea and Japan.

[3][4] The species is adventive and widespread in North America (southeastern Canada to the Great Lakes and Florida), and is still spreading.

[5][6] The initial introductions of this species in the United States were intended as a controlling agent for the Russian wheat aphid (Hoebeke 2019).

In addition the species can be found in forest litter, on brushwood, on coarse woody debris, in moss, in straw in sheds, in detritus and alluvial soil, in rotten plant residues, and also in compost.