http://slugsite.us/bow/phil/undula.html
http://www.seaslugforum.net/showall/thurundu
http://rfbolland.com/okislugs/thurundu.html
http://www.medslugs.de/E/Pac-W/Thuridilla_undula/Selection.htm
http://www.Philippine-Sea-Slugs.com/Sacoglossa/Thuridilla_undula.htm
http://seaslugs.free.fr/nudibranche/a_thuri_undula.htm
http://www.holleyuw.com/country2.asp?strLink2=mal1&strSpecies=11&strImg=Thur-undula.jpg&strName=Thuridilla%20undula&strNotes=#bigImg
http://sacoglossa.lifedesks.org/node/471
http://www.umiushi-zukan.com/eng/list_pic.php?ssw=g&kind_id=87
http://www.medslugs.de/E/Ind-E/Thuridilla_undula/Selection.htm