MolluscaBase taxon details
original description
(of Polygyra columbiana megasoma Pilsbry, 1928) Pilsbry, H. A. (1928). Species of <i>Polygyra</i> from Montana, Idaho, and the Pacific coast states. <em>Proceedings of the Academy of Natural Sciences of Philadelphia.</em> 80: 177-186.
page(s): 185, figs. 8-9 [details]
original description
(of Helix columbiana var. dentacula Andrus, 1897) Andrus, F.H. (1897). Notes on the land shells of Douglas Co., Ore. The Oregon Naturalist, 4(1): 53-54.
page(s): 53 [details]
basis of record
InvertEBase. (2018). Authority files of U.S. and Canadian land and freshwater mollusks developed for the InvertEBase (InvertEBase.org) project. [details]
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): 86; note: As Vespericola megasoma (Dall, 1905) [details]