http://www.ne.jp/asahi/kappa-kuri/miyamoto/OSEHOO/umiushi47.html
http://www.seaslugforum.net/showall/hypsplac
http://www.sea-slug.com/species/umiusi201.htm
http://www.umiushi.info/photo_species/photo_splist_eng.php?sopt=0&loc=0000
http://www.h.do-up.com/home/takayan/takapage342.htm
http://online.divers.ne.jp/rie/seaslug/echizen2002/4.html
http://www.ne.jp/asahi/kappa-kuri/miyamoto/OSEHOO/umiushi343.html
http://www.medslugs.de/E/Pac-NW/Hypselodoris_placida/Selection.htm
http://www.nudibranch.com.au/pages/9497a.htm
http://www.umiushi-zukan.com/eng/list_pic.php?ssw=g&kind_id=583