http://www.pictonb.freeserve.co.uk/nudibranchs/oncdep.html
http://www.seaslugforum.net/showall/onchdepr
http://www.habitas.org.uk/marinelife/species.asp?item=W13330
http://www.nudipixel.net/species/onchidoris_depressa/
http://www.facebook.com/media/set/?set=o.374656695905614&type=1
http://rfbolland.com/okislugs/onchdep1.html
http://opistobranquis.info/en/guia/nudibranchia/euctenidiacea/doridacea/onchidoris-depressa/
http://www.medslugs.de/E/Atl-NE/Knoutsodonta_depressa/Selection.htm