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): 118, 119; note: Moellendorff (1898: 119) lists subspecies calva Mlldff. from northern Luzon with no description or comment. This is considered a nomen nudum here. [details]
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