original description
(of Helix ptychophora A. D. Brown, 1870) Brown, A.D. (1870). Diagnoses molluscorum novorum. Journal de Conchyliologie, 18: 391-393., available online at https://www.biodiversitylibrary.org/page/15160810
page(s): 392 [details]
original description
(of Polygyra solida 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, figs. 1-2 [details] Available for editors [request]
original description
(of Mesodon townsendiana var. minor Tryon, 1867) Tryon, G. W. (1867). Monograph of the terrestrial Mollusca of the United States. <em>American Journal of Conchology.</em> 3(1): 34-80, plates 7-10., available online at https://www.biodiversitylibrary.org/page/6658682
page(s): 46, pl. 8, fig. 6 [details]
original description
(of Mesodon ptychophorus var. major W. G. Binney, 1886) Binney, W.G. (1886). A second supplement to the fifth volume of the terrestrial air-breathing mollusks of the United States and adjacent territories. Bulletin of the Museum of Comparative Zoology, 13(2): 23-48, plates 1-3.
page(s): 39, pl. 1, fig. 3 [details]
original description
(of Helix ptychophorus var. castaneus Hemphill, 1890) Hemphill, H. (1890). New varieties of western land shells. <em>The Nautilus.</em> 4(4): 41-43., available online at https://www.biodiversitylibrary.org/page/12596652
page(s): 41 [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
Carney, W. P. (1966). Mortality and apertural orientation in <i>Allogona ptychophora</i> during winter hibernation in Montana. <em>The Nautilus.</em> 79(4): 134-136., available online at https://www.biodiversitylibrary.org/page/8517555 [details]
additional source
Webb, G. R. (1968). Attempted sinistral-dextral mating. <em>The Nautilus.</em> 82(2): 76., available online at https://www.biodiversitylibrary.org/page/8517125 [details]
From editor or global species database