http://www.gastropods.com/2/Shell_31292.shtml
http://www.nmr-pics.nl/Limacinidae/album/index.html
http://species-identification.org/species.php?species_group=pelagic_molluscs&menuentry=soorten&id=282
http://species-identification.org/species.php?species_group=pelagic_molluscs&menuentry=soorten&id=283
http://species-identification.org/species.php?species_group=pelagic_molluscs&menuentry=soorten&id=284
http://opistobranquis.info/en/guia/thecosomata/limacina-retroversa/
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