http://www.conchology.uunethost.be/GENERAL/Cyberconchology/SuperConch/Gastropoda/ACTEONIDAE.html
http://www.medslugs.de/E/Med/Acteon_tornatilis.htm
http://www.ugr.es/~lstocino/acteon_tornatilis.htm
http://www.seaslugforum.net/factsheet.cfm?base=actetorn
http://www.marenostrum.org/vidamarina/animalia/invertebrados/moluscos/gasteropodos/opistobranquios/atornatilis/index.htm
http://gastropods.com/1/Shell_2251.shtml