http://www.umiushi.info/photo_species/photo_splist_eng.php?sopt=0&loc=0000
http://www.ne.jp/asahi/kappa-kuri/miyamoto/OSEHOO/umiushi337.html
http://www.fitweb.or.jp/~janolus/033105.htm
http://www.medslugs.de/E/Pac-NW/Elysia_japonica/Selection.htm