http://www.ne.jp/asahi/kappa-kuri/miyamoto/OSEHOO/umiushi119.html
http://www.cosmos.ne.jp/~breach/slug%20full%205/nudi%20full145.html
http://rfbolland.com/okislugs/okenjapo.html
http://rfbolland.com/okislugs/okenjap2.html
http://www.seaslugforum.net/showall/okenjapo
http://www.sea-slug.com/species/umiusi133.htm
http://www.umiushi.info/photo_species/photo_splist_eng.php?sopt=0&loc=0000
http://www.h.do-up.com/home/takayan/takapage43.htm
http://www.medslugs.de/E/Pac-NW/Okenia_japonica/Selection.htm
http://www.nudipixel.net/species/okenia_japonica/
http://www.umiushi-zukan.com/eng/list_pic.php?ssw=g&kind_id=153
http://www.Philippine-Sea-Slugs.com/Nudibranchia/Euctenidiacea/Okenia_japonica.htm
http://www.medslugs.de/E/Pac-W/Okenia_japonica/Selection.htm