Hanna, G. D. (1922). Fossil freshwater mollusks from Oregon, contained in the Condon Museum of the University of Oregon. <em>University of Oregon Publication.</em> 1(12): 1-22., available online athttps://www.biodiversitylibrary.org/page/20825593 page(s): 4 [details]
MolluscaBase eds. (2025). MolluscaBase. Planorbis (Paraplanorbis) G. D. Hanna, 1922 †. Accessed through: Marine Species Traits editorial board (2025) Marine Species Traits at: https://www.marinespecies.org/traits/aphia.php?p=taxdetails&id=1258505 on 2025-05-17
Marine Species Traits editorial board (2025). Marine Species Traits. Planorbis (Paraplanorbis) G. D. Hanna, 1922 †. Accessed at: https://marinespecies.org/traits/aphia.php?p=taxdetails&id=1258505 on 2025-05-17
original descriptionHanna, G. D. (1922). Fossil freshwater mollusks from Oregon, contained in the Condon Museum of the University of Oregon. <em>University of Oregon Publication.</em> 1(12): 1-22., available online athttps://www.biodiversitylibrary.org/page/20825593 page(s): 4 [details]
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