original description
Arnold R. (1907). New and characteristic species of fossil mollusks from the oil-bearing Tertiary formations of Santa Barbara County, California. <em>Smithsonian Miscellaneous Collections.</em> 50(4): 419-447, pls 50-58., available online at https://www.biodiversitylibrary.org/page/30049393
page(s): 430, pl. 54, figs 6, 7 [details]
basis of record
Henderson, J. (1935). Fossil non-marine Mollusca of North America. <em>Geological Society of America Special Papers.</em> 3: 1-313.
page(s): 235 [details] Available for editors [request]
From editor or global species database
Type locality One mile southeast of bench-mark 425, Los Alamos Valley, Santa Barbara County, locality No. 4483, California, United States; Paso Robles Formation, early Pleistocene [details]