original description
Wanner, H.E. (1921). Some faunal remains from the Trias of York County, Pennsylvania. <em>Proceedings of the Academy of Natural Sciences of Philadelphia.</em> 73(1): 25-37., available online at https://biodiversitylibrary.org/page/1650615
page(s): 36, pl. 3, fig. 1 [details]
additional source
Watters, G.T. (2001). The Evolution of the Unionacea in North America, and Its Implications for the Worldwide Fauna. In: Bauer, G.; Wächtler, K. (eds) Ecology and Evolution of the Freshwater Mussels Unionoida. Springer, Berlin, Heidelberg, pp. 281-307 [details]
From editor or global species database
Type locality "Shale, Little Conewago Creek", York Co., Pennsylvania, USA; Triassic [details]