MolluscaBase eds. (2025). MolluscaBase. Helminthoglypta napaea napaea S. S. Berry, 1938. Accessed through: Marine Species Traits editorial board (2025) Marine Species Traits at: https://www.marinespecies.org/traits/aphia.php?p=taxdetails&id=1352930 on 2025-05-27
Marine Species Traits editorial board (2025). Marine Species Traits. Helminthoglypta napaea napaea S. S. Berry, 1938. Accessed at: https://www.marinespecies.org/traits/aphia.php?p=taxdetails&id=1352930 on 2025-05-27
basis of recordInvertEBase. (2018). Authority files of U.S. and Canadian land and freshwater mollusks developed for the InvertEBase (InvertEBase.org) project. [details]