original description(of)Pilsbry, H. A. (1894). Descriptive notes on certain forms of <i>Polygyra</i>. <em>The Nautilus.</em> 7(12): 139-141., available online athttps://www.biodiversitylibrary.org/page/43044581 page(s): 140 [details]
basis of recordEmberton, K. C. (1995). When shells do not tell: 145 million years of evolution in North America's polygyrid land snails, with a revision and conservation priorities. <em>Malacologia.</em> 37(1): 69-110. Ann Arbor., available online athttps://www.biodiversitylibrary.org/page/13113494 page(s): 92 [details]
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