http://rfbolland.com/okislugs/hydaampl.html
http://www.seaslugforum.net/factsheet.cfm?base=hydaampl
http://umiushi.zive.net/photo_species/photo_splist_eng.php?sopt=0&loc=0000
http://slugsite.us/bow/amplus.htm
http://www.medslugs.de/E/Ind-SW/Hydatina_amplustre.htm
http://seaslugs.free.fr/nudibranche/a_hyda_amplustre.htm
http://www.xenophora.org/Iconographie/Aplustridae/Aplustrum%20amplustre%201/Cadre%20Aplustrum%20amplustre%201.html
http://www.seaslugsofhawaii.com/species/Hydatina-amplustre-a.html
http://www.underwaterkwaj.com/nudi/cephalaspideans/e135.htm
http://www.underwaterkwaj.com/nudi/hawaii/hc06.htm