original description(ofHelix undina L. Pfeiffer, 1856)Pfeiffer, L. (1856). Descriptions of twenty-five new species of land-shells, from the collection of H. Cuming, Esq. <em>Proceedings of the zoological Society of London.</em> 24 (302): 32; 24 (303): 33-36. London [16 June]., available online athttps://www.biodiversitylibrary.org/page/12860555 page(s): 34 [details]
basis of recordMöllendorff, O. F. von. (1898). Verzeichnis der auf den Philippinen lebenden Landmollusken. <em>Abhandlungen der Naturforschenden Gesellschaft zu Görlitz.</em> 22: 26-208., available online athttps://biodiversitylibrary.org/page/58468236 page(s): 100 [details]
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