http://www.seaslugforum.net/showall/phylgemm
http://seaslugs.free.fr/nudibranche/a_popsis_gemmata.htm
http://www.nudipixel.net/species/phyllidiopsis_gemmata/
http://www.medslugs.de/E/Ind-SW/Phyllidiopsis_gemmata/Selection.htm