Eupithecia pygmaeata, the marsh pug, is a moth of the Geometridae family. It is known from most of Europe, western and southern Siberia, the Russian Far East, northern Mongolia and North America (from Alaska to Newfoundland and Labrador and Quebec, south to Colorado). The wingspan is 14–18 mm. The ground colour of the forewings is dark brown. The forewings have a small white dot at the inner angle and two dark spots at the costal edge.They are pointed not rounded. The hindwings are similar in colour and have a pale dot at the tornal margin.