Idaea emarginata, the small scallop, is a moth of the family Geometridae. It was first described by Carl Linnaeus in his 1758 10th edition of Systema Naturae and it is found in Europe.
The species has a wingspan of 22âÂÂ25 mm. The length of the forewings is 11âÂÂ13 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 marshes.