(ofPolygyra Say, 1818)Say T. (1818). Account of two new genera, and several new species, of fresh water and land snails. <em>Journal of the Academy of Natural Sciences of Philadelphia.</em> 1: 276-284., available online athttp://biodiversitylibrary.org/page/24680546 page(s): 276-277 [details]
original description(ofPolygyra Say, 1818)Say T. (1818). Account of two new genera, and several new species, of fresh water and land snails. <em>Journal of the Academy of Natural Sciences of Philadelphia.</em> 1: 276-284., available online athttp://biodiversitylibrary.org/page/24680546 page(s): 276-277 [details]
basis of recordSacco, F. (1889). Aggiunte alla fauna malacologica estramarina fossile del Piemonte e della Ligura. <em>Memorie della Reale Accademia delle Scienze di Torino, Serie II.</em> 39 (1), 61-98., available online athttps://www.biodiversitylibrary.org/page/43230615 page(s): 77 [details]
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