Pilsbry, H. A. & Johnson, C. W. (1917). New Mollusca of the Santo Domingan Oligocene. <em>Proceedings of the Academy of Natural Sciences of Philadelphia.</em> 69: 150-202., available online athttps://www.biodiversitylibrary.org/page/5442193 page(s): 173 [details]
MolluscaBase eds. (2025). MolluscaBase. Hipponix otiosa Pilsbry & C. W. Johnson, 1917 †. Accessed through: Marine Species Traits editorial board (2025) Marine Species Traits at: https://www.marinespecies.org/traits/aphia.php?p=taxdetails&id=1817979 on 2025-09-18
Marine Species Traits editorial board (2025). Marine Species Traits. Hipponix otiosa Pilsbry & C. W. Johnson, 1917 †. Accessed at: https://www.marinespecies.org/traits/aphia.php?p=taxdetails&id=1817979 on 2025-09-18
original descriptionPilsbry, H. A. & Johnson, C. W. (1917). New Mollusca of the Santo Domingan Oligocene. <em>Proceedings of the Academy of Natural Sciences of Philadelphia.</em> 69: 150-202., available online athttps://www.biodiversitylibrary.org/page/5442193 page(s): 173 [details]
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