original description(ofVertigo quadrasi Möllendorff, 1894)Quadras, J. F.; Möllendorf, O. F. von. (1894). Diagnoses specierum novarum a J. F. Quadras in insulis Mariannis collectarum. <em>Nachrichtsblatt der Deutschen Malakozoologischen Gesellschaft.</em> 26(1-2): 13-22, 33-42., available online athttps://biodiversitylibrary.org/page/15601420 page(s): 17 [details]
basis of recordPilsbry, H. A. (1900). Notes on Polynesian and East Indian Pupidae. <em>Proceedings of the Academy of Natural Sciences of Philadelphia.</em> 52: 431-433., available online athttps://www.biodiversitylibrary.org/page/24694311 page(s): 433 [details]
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