Topographic map of Europe showing sampling locations. The two populations sampled are Korallen off Norway and Santa Maria di Leuca off Italy. One field picture from each of the latter two sites was included in the figure (above, photograph from Korallen by Pål Buhl-Mortensen, Institute of Marine Research; below, photograph from Santa Maria di Leuca by Marum, University of Bremen). The published L. pertusa mitogenome  came from Nord-Leksa. The shaded relief comes from the ETOPO2v2 2-minute grid , which north of 64°N is based on the International Bathymetric Chart of the Arctic Ocean (IBCAO) .