http://slugsite.us/bow/nudiwk67.html
http://www.seaslugforum.net/factsheet.cfm?base=thecdarw
http://www.guiamarina.com/gallery/v/Chile/01+marine+animals/04+Mollusca/Opisthobranchia/Thecacera+darwini/
http://www.medslugs.de/E/Pac-SE/Thecacera_darwini/Selection.htm