Idaea emarginata, the small scallop, is a moth of the family Geometridae. It is found in Europe. The species has a wingspan of 22–25 mm. The length of the forewings is 11–13 mm. The adults fly at night from June to August , and can be attracted to light. The species prefers damp locations such as marshy woodland, meadows and marches. 1. \n* The flight season refers to the British Isles. This may vary in other parts of the range.