original description
Leonard, A.B.; Franzen, D.S. (1944). Mollusca of the Laverne Formation (Lower Pliocene) of Beaver County, Oklahoma. <em>The University of Kansas Science Bulletin.</em> 30(1): 15-39., available online at https://biodiversitylibrary.org/page/2994493
page(s): 20, pl. 4, fig. 4 [details]
source of synonymy
Miller, B. B.; Tevesz, M. J.; Smith, D. C. (1998). Paleolimnological significance of spinose and non-spinose morphs of <em>Pyrgophorus hibbardi</em> (Leonard and Franzen, 1944). <em>Journal of Paleolimnology.</em> 20(1): 99-102., available online at https://doi.org/10.1023/a:1007918626424 [details] Available for editors [request]
From editor or global species database
Type locality Locality No. 2, five and one-half miles south of Gate, Beaver county, Oklahoma, United States; Ogallala Formation, middle Miocene to Pliocene [details]