All species of butterflies native to Europe are included, except those which are confined to the North Caucasus countries. The geographical scope is continent-wide, extending from Iceland in the west to the Urals in the east, and from Franz Josef Land in the north to the Canary Islands in the south. The Caucasus region is not included. Red List assessments were made at two regional levels: for geographical Europe, and for the 27 current Member States of the European Union.
IUCN, 2010. Van Swaay, C.; Cuttelod, A.; Collins, S.;Maes, D.; López Munguira, M.; Šašić, M.; Settele, J.;Verovnik, R.; Verstrael, T.; Warren, M.; Wiemers, M.and Wynhof, I., 2010. European Red List of Butterfies. Luxembourg: Publications Office of the European Union.