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WikiPedia: Margarella expansa http://www.marinespecies.org/aphia.php?p=taxdetail... http://www.marinespecies.org/ http://invertebrates.si.edu/antiz/taxon_view.cfm?t... http://www.boldsystems.org/index.php/Taxbrowser_Ta... https://www.biodiversitylibrary.org/name/Margarell... http://www.eol.org/pages/4797277 http://collections.mnh.si.edu/search/iz/?qn=Margar... http://www.marinespecies.org/aphia.php?p=taxdetail... http://www.gastropods.com/1/Shell_21841.shtml https://eol.org/pages/3048891