http://www.nmr-pics.nl/Philinidae/album/index.html
http://hypselodoris.blogspot.pt/2012/03/philine-aperta-linnaeus-1767.html
http://www.medslugs.de/E/Med/Philine_quadripartita/Selection.htm
http://www.medslugs.de/E/Atl-NE/Philine_quadripartita/Selection.htm
http://www.guiamarina.com/gallery/v/Baltic+Sea/03+Animals/05+Mollusca/Opisthobranchia/Philine+aperta/
http://opistobranquis.info/en/guia/cephalaspidea/philine-quadripartita/