Dall, W. H. & Bartsch, P. (1909). A monograph of West American pyramidellid mollusks. <em>Bulletin of the United States National Museum.</em> 68 (30): 1-258., available online athttp://www.biodiversitylibrary.org/item/32384 page(s): 166, pl. 17 fig. 8 [details]
MolluscaBase eds. (2024). MolluscaBase. Odostomia (Chrysallida) helga Dall & Bartsch, 1909. Accessed at: https://molluscabase.org/aphia.php?p=taxdetails&id=581216 on 2024-04-19
original descriptionDall, W. H. & Bartsch, P. (1909). A monograph of West American pyramidellid mollusks. <em>Bulletin of the United States National Museum.</em> 68 (30): 1-258., available online athttp://www.biodiversitylibrary.org/item/32384 page(s): 166, pl. 17 fig. 8 [details]
Present Inaccurate Introduced: alien Containing type locality