Boettger, O. (1897). Neue <em>Helix</em>-Formen aus dem Mainzer Tertiär. <em>Nachrichtsblatt der Deutschen Malakozoologischen Gesellschaft.</em> 29(1-2): 16-21., available online athttps://www.biodiversitylibrary.org/page/28228270 page(s): 16 [details]
MolluscaBase eds. (2024). MolluscaBase. Helix (Hemistenotrema) O. Boettger, 1897 †. Accessed at: https://www.molluscabase.org/aphia.php?p=taxdetails&id=1082733 on 2024-04-20
original descriptionBoettger, O. (1897). Neue <em>Helix</em>-Formen aus dem Mainzer Tertiär. <em>Nachrichtsblatt der Deutschen Malakozoologischen Gesellschaft.</em> 29(1-2): 16-21., available online athttps://www.biodiversitylibrary.org/page/28228270 page(s): 16 [details]
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