http://www.seaslugforum.net/showall/halgform
http://slugsite.us/bow/nudwk208.htm
http://www.medslugs.de/E/Ind-SW/Halgerda_formosa/Selection.htm
http://www.nembro.info/uk_halgerda_formosa.html
http://seaslugs.free.fr/nudibranche/a_hal_formosa.htm
http://www.underwaterkwaj.com/nudi/cryptobranchs/e346.htm
http://www.nudipixel.net/species/halgerda_formosa/