MolluscaBase taxon details
original description
(of Helix pedestris A. Gould, 1846) Gould, A.A. (1846). New species of Helix, from the Shells of the Exploring Expedition. Proceedings of the Boston Society of Natural History, 2: 165-167. Boston.
page(s): 166 [details]
original description
(of Allogona (Dysmedoma) townsendiana f. frustrationis Pilsbry, 1940) Pilsbry, H. A. (1940). Land Mollusca of North America (north of Mexico). Volume I Part 2. <em>The Academy of Natural Sciences of Philadelphia Monographs.</em> 3: i-vii, 575-994, i-ix. Philadelphia [1 August].
page(s): 885, fig. 509f [details]
original description
(of Helix townsendiana I. Lea, 1838) Lea, I. (1838). Description of new freshwater and land shells. <em>Transactions of the American Philosophical Society.</em> new ser., 6: 1-154, plates 1-24., available online at https://www.biodiversitylibrary.org/page/26881423
page(s): 99, pl. 23, fig. 80 [details]
original description
(of Polygyra townsendiana var. brunnea Vanatta, 1924) Vanatta, E. G. (1924). Descriptions of four new American shells. <em>Proceedings of the Academy of Natural Sciences of Philadelphia.</em> 76: 25–27.
page(s): 25-26 [details] Available for editors [request]
basis of record
InvertEBase. (2018). Authority files of U.S. and Canadian land and freshwater mollusks developed for the InvertEBase (InvertEBase.org) project. [details]