MolluscaBase taxon details
original description
(of Polygyra sierriana S. S. Berry, 1921) Berry, S. S. (1921). Some land snails of Shasta County, California. <em>The Nautilus.</em> 35(2): 35-39, pl. 2., available online at https://www.biodiversitylibrary.org/page/1712055
page(s): 36, pl. 2, figs. 8-9 [details]
basis of record
Roth, B. & Sadeghian, P.S. (2003). Checklist of the land snails and slugs of California. <em>Santa Barbara Museum of Natural History, Contributions in Science.</em> 3: 1-81.
page(s): 38 [details] Available for editors [request]
additional source
Emberton, 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 at https://www.biodiversitylibrary.org/page/13113494
page(s): 87; note: As Vespericola sierrana [details]