Common Flat-body Agonopterix heracliana
The Common Flat-body reaches a wing-span of 17 to 25 mm. It is a greyish moth hard to tell apart from other Flat-body Moths. The markings on the front wing for instance are the same in this species and in the Large Carrot Flat-body (Agonopterix ciliella). The difference is in the fringe of the front wing, in which the Common Flat-body has 1 or 2 greyish lines, while the Large Carrot Flat-body has 3 lines or more. The other Flat-bodies usually have some distinctive marking. Worn animals however may be impossible to identify.
The larvae are green, with a pink spot on top. They spin some leaves of the foodplant in which they live. Foodplants are always umbelliferous plants, such as Cow Parsley and Common Hogweed. They can be seen from May to July. Pupation takes a very short time and fresh adults are on the wing by the middle of August.
Most adult Common Flat-bodies are seen from September to April, even on mild days in January and February. Infrequently adults are seen from April to August as well, which means this moth can be seen all year round. It is readily attracted to light. It is a common, sometimes even abundant species all over Europe, including all of the British Isles. Recently it has been discovered in the USA as well. There it is considered to be an invasive species.