(of)Howchin, W. (1888). Additions to the Knowledge of the Carboniferous Foraminifera. <em>Journal of the Royal Microscopical Society.</em> 8(4), 533-545., available online athttps://biodiversitylibrary.org/page/31221020[details]
Hayward, B.W.; Le Coze, F.; Vachard, D.; Gross, O. (2025). World Foraminifera Database. Omphalotis circumplicata (Howchin, 1888) †. Accessed through: Marine Species Traits editorial board (2025) Marine Species Traits at: https://www.marinespecies.org/traits/aphia.php?p=taxdetails&id=1345117 on 2025-05-21
Marine Species Traits editorial board (2025). Marine Species Traits. Omphalotis circumplicata (Howchin, 1888) †. Accessed at: https://www.marinespecies.org/traits/aphia.php?p=taxdetails&id=1345117 on 2025-05-21
original description(of)Howchin, W. (1888). Additions to the Knowledge of the Carboniferous Foraminifera. <em>Journal of the Royal Microscopical Society.</em> 8(4), 533-545., available online athttps://biodiversitylibrary.org/page/31221020[details]
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