Traits taxon details
original description
White, C.A. (1895). Notes on the invertebrate fauna of the Dakota formation, with description of new molluscan forms <em>Proceedings of the United States National Museum</em>. 17: 131-138, available online at https://www.biodiversitylibrary.org/page/15675129 page(s): 135, pl. 8, fig. 13 [details]
basis of record
Henderson, J. (1935). Fossil non-marine Mollusca of North America. <em>Geological Society of America Special Papers.</em> 3: 1-313. page(s): 213 [details] Available for editors 
additional source
Yen, J. T.-C. (1958). Systematics and Distributions of <i>Pyrgulifera</i> Meek. <em>Annalen des Naturhistorischen Museums in Wien.</em> 62: 193-209., available online at http://www.zobodat.at/pdf/ANNA_62_0193-0209.pdf page(s): 194 [details]
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