http://slugsite.tierranet.com/wirtz98/p_2_4.htm
http://www.seaslugforum.net/showall/phyllich
http://www.medslugs.de/E/Atl-E/Phylliroe_lichtensteinii/Selection.htm
http://species-identification.org/species.php?species_group=pelagic_molluscs&menuentry=soorten&id=185