http://www.ne.jp/asahi/kappa-kuri/miyamoto/OSEHOO/umiushi102.html
http://www.seaslugforum.net/showall/elysobtu
http://www.sea-slug.com/species/umiusi246.htm
http://www.umiushi.info/photo_species/photo_splist_eng.php?sopt=0&loc=0000
http://rfbolland.com/okislugs/elysobtu.html
http://rfbolland.com/okislugs/elysobt2.html
http://www.h.do-up.com/home/takayan/takapage212.htm
http://www.medslugs.de/E/Pac-NW/Elysia_obtusa/Selection.htm
http://www.nudibranch.com.au/pages/7487c.htm
http://www.underwaterkwaj.com/nudi/sacoglossans/e084.htm
http://www.nudipixel.net/species/elysia_obtusa/
http://sacoglossa.lifedesks.org/pages/34270
http://www.Philippine-Sea-Slugs.com/Sacoglossa/Elysia_obtusa.htm
http://www.medslugs.de/E/Pac-W/Elysia_obtusa.htm
http://www.nuditahiti.com/liste-des-espèces/elysia-obtusa/
http://www.vibrantsea.net/elysia2175_anilao2013.htm