http://www.medslugs.de/E/Med/Akera_bullata/Selection.htm
http://www.seaslugforum.net/showall/akerbull
http://www.conchsoc.org/spaccount/akera-bullata
http://opistobranquis.info/en/guia/anaspidea/akera-bullata/
http://www.medslugs.de/E/Atl-NE/Akera_bullata/Selection.htm
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