http://slugsite.us/bow/nudwk258.htm
http://www.seaslugforum.net/factsheet.cfm?base=crosdaed
http://www.inbio.ac.cr/papers/babosasmarinas/ingles/listadeesp.htm
http://www.medslugs.de/E/Pac-E/Crosslandia_daedali.htm