MolluscaBase name details
original description
Lea I. (1864). Descriptions of twenty-four new species of <i>Physa</i> of the United States and Canada. <em>Proceedings of the Academy of Natural Sciences of Philadelphia.</em> 16: 114-116 [after 25 April 1864, before 30 June 1864]., available online at https://www.biodiversitylibrary.org/page/1942708
page(s): 116 [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
Henderson, J. (1936). <i>Physa ampullacea</i> Gould, <i>Physa nuttallii</i> Lea and <i>Physa columbiana</i> Hemphill. <em>The Nautilus.</em> 49(3): 85-87., available online at https://www.biodiversitylibrary.org/page/8527720 [details]