(of)Martens, E. von. (1864). Diagnosen neuer Heliceen aus dem ostasiatischen Archipel. <em>Monatsberichte der Königlichen Preussischen Akademien der Wissenschaften zu Berlin.</em> 1864: 523–529., available online athttps://www.biodiversitylibrary.org/page/35180469#page/541/ page(s): 525 [details]
MolluscaBase eds. (2025). MolluscaBase. Obba calcar (E. von Martens, 1864). Accessed through: Marine Species Traits editorial board (2025) Marine Species Traits at: https://www.marinespecies.org/traits/aphia.php?p=taxdetails&id=1427969 on 2025-09-18
Marine Species Traits editorial board (2025). Marine Species Traits. Obba calcar (E. von Martens, 1864). Accessed at: https://www.marinespecies.org/traits/aphia.php?p=taxdetails&id=1427969 on 2025-09-18
original description(of)Martens, E. von. (1864). Diagnosen neuer Heliceen aus dem ostasiatischen Archipel. <em>Monatsberichte der Königlichen Preussischen Akademien der Wissenschaften zu Berlin.</em> 1864: 523–529., available online athttps://www.biodiversitylibrary.org/page/35180469#page/541/ page(s): 525 [details]
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