http://www.ne.jp/asahi/kappa-kuri/miyamoto/OSEHOO/umiushi41.html
http://www.sea-slug.com/species/umiusi040.htm
http://www.umiushi.info/photo_species/photo_splist_eng.php?sopt=0&loc=0000
http://www.h.do-up.com/home/takayan/takapage308.htm
http://www.h.do-up.com/home/takayan/takapage363.htm
http://www.medslugs.de/E/Pac-NW/Noumea_subnivalis/Selection.htm
http://www.umiushi-zukan.com/eng/list_pic.php?ssw=g&kind_id=588
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