http://www.angelfire.com/mi/sharkcage69/nudi/chrom07.html
http://www.seaslugforum.net/showall/chroobso
http://www.medslugs.de/E/Ind-NW/Goniobranchus_obsoletus/Selection.htm
http://slugsite.us/bow2007/nudwk616.htm
http://www.nudipixel.net/species/chromodoris_obsoleta/