MolluscaBase name details
basis of record
Bank, R. A. (2017). Classification of the Recent terrestrial Gastropoda of the World. Last update: July 16th, 2017. [details]
additional source
Pilsbry, H. A. (1928). Types of <i>Vortex</i> and <i>Volvulus</i> Oken. <em>The Nautilus.</em> 41(3): 108., available online at https://www.biodiversitylibrary.org/page/8519839 [details]