Pleurobranchus testudinarius  Cantraine, 1835

http://slugsite.us/bow/wirtz/wirtz18.htm
http://www.medslugs.de/E/Med/Pleurobranchus_testudinarius/Selection.htm
http://slugsite.us/bow/wirtz98/peter_6.htm
http://slugsite.us/bow/wirtz98/peter_7.htm
http://www.seaslugforum.net/showall/pleutest
http://www.ugr.es/~lstocino/pleurobranchus_testudinarius.htm
http://digilander.iol.it/netofotosub/Pagine/susan.htm
http://marenostrum.org/opistobranquios/ptestudinarius/index.htm
http://www.medslugs.de/E/Atl-E/Pleurobranchus_testudinarius/Selection.htm
http://www.nudipixel.net/species/pleurobranchus_testudinarius/
http://opistobranquis.info/en/guia/pleurobranchomorpha/pleurobranchus-testudinarius/