Traits taxon details
original description
(of Helix (Pyramidula) thurstoni L. S. Russell, 1926 †) Russell, L.S. (1926). Mollusca of the Paskapoo Formation in Alberta. <em>Transactions of the Royal Society of Canada, third series. Section IV - Geological Sciences.</em> 20: 207-220. page(s): 219-220, pl. 3, figs 3-5 [details] Available for editors 
basis of record
Roth, B. (1986). Land mollusks (Gastropoda: Pulmonata) from Early Tertiary Bozeman Group, Montana. <em>Proceedings of the California Academy of Sciences.</em> 44(11): 237-267., available online at https://www.biodiversitylibrary.org/page/16005679 page(s): 264 [details] Available for editors 
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