(ofPhilbertia helena Dall, 1919)Dall, W. H. (1919). Descriptions of new species of mollusks of the family Turritidae from the west coast of America and adjacent regions. <em>Proceedings of the United States National Museum.</em> 56 (2288): 1-86, pls 1-24., available online athttps://biodiversitylibrary.org/page/7765993[details]
MolluscaBase eds. (2024). MolluscaBase. Pyrgocythara helena (Dall, 1919). Accessed at: https://molluscabase.org/aphia.php?p=taxdetails&id=434850 on 2024-04-20
original description(ofPhilbertia helena Dall, 1919)Dall, W. H. (1919). Descriptions of new species of mollusks of the family Turritidae from the west coast of America and adjacent regions. <em>Proceedings of the United States National Museum.</em> 56 (2288): 1-86, pls 1-24., available online athttps://biodiversitylibrary.org/page/7765993[details]