Cooper J.G. (1870). The West-coast fresh-water univalves, No. 1. <em>Proceedings of the California Academy of Sciences, series 1.</em> 4: 92-100., available online athttps://www.biodiversitylibrary.org/page/3181876 page(s): 99 [details]
MolluscaBase eds. (2021). MolluscaBase. Planorbis (Helisoma) occidentalis J. G. Cooper, 1870. Accessed at: https://www.molluscabase.org/aphia.php?p=taxdetails&id=1312183 on 2024-04-19
original descriptionCooper J.G. (1870). The West-coast fresh-water univalves, No. 1. <em>Proceedings of the California Academy of Sciences, series 1.</em> 4: 92-100., available online athttps://www.biodiversitylibrary.org/page/3181876 page(s): 99 [details]
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