http://www.ne.jp/asahi/kappa-kuri/miyamoto/OSEHOO/umiushi95.html
http://rfbolland.com/okislugs/polyjapo.html
http://rfbolland.com/okislugs/polyjap2.html
http://www.sea-slug.com/species/umiusi340.htm
http://www.umiushi.info/photo_species/photo_splist_eng.php?sopt=0&loc=0000
http://www.ne.jp/asahi/kappa-kuri/miyamoto/OSEHOO/umiushi247.html
http://www.medslugs.de/E/Pac-NW/Polycera_japonica/Selection.htm
http://www.seaslugsofhawaii.com/species/Polycera-japonica-a.html
http://www.nudipixel.net/species/polycera_japonica/
http://tahitinudi.jimdo.com/liste-des-espèces/polycera-japonica/
http://www.umiushi-zukan.com/eng/list_pic.php?ssw=g&kind_id=169