original description
(of Quadrula guatemalensis C. T. Simpson, 1900) Simpson, C. T. (1900). New and unfigured Unionidae. <em>Proceedings of the Academy of Natural Sciences of Philadelphia.</em> 52: 74-86, pls 1-5., available online at http://biodiversitylibrary.org/page/24693954
page(s): 83, pl. 2, fig. 4 [details]
original description
(of Elliptio divaricatus W. B. Marshall, 1926) Marshall, W. B. (1926). New land and fresh-water mollusks from Central and South America. <em>Proceedings of the United States National Museum.</em> 69(2638): 1-12., available online at https://biodiversitylibrary.org/page/15384825
page(s): 5 [details]
basis of record
Graf, D.; Cummings, K. (2019). Musselp database: The Freshwater Mussels (Unionoida) of the World (and other less consequential bivalves). , available online at http://mussel-project.uwsp.edu/ [details]
From editor or global species database
Type locality Guatemala, Usumacinta River [details]