MolluscaBase name details
basis of record
InvertEBase. (2018). Authority files of U.S. and Canadian land and freshwater mollusks developed for the InvertEBase (InvertEBase.org) project. [details]
additional source
Field, S. C. (1931). Note on California shells of the <i>Helminthoglypta cuyamacensis</i> group. <em>The Nautilus.</em> 44(1): 29., available online at https://www.biodiversitylibrary.org/page/8527854 [details]