http://www.medslugs.de/E/Atl-W/Ceratophyllidia_papilligera/Selection.htm
http://www.seaslugforum.net/showall/cerapapi
http://www.nudipixel.net/species/ceratophyllidia_papilligera/
http://darnis.inbio.ac.cr/ubisen/FMPro?-DB=UBIPUB.fp3&-lay=WebAll&-error=norec.html&-Format=detail.html&-Op=eq&id=866&-Find
http://slugsite.us/bow2007/nudwk1041.htm