Pilsbry, H.A. (1935). Mollusks of the fresh-water Pliocene beds of the Kettleman Hills and neighboring oil fields, California. <em>Proceedings of the Academy of Natural Sciences of Philadelphia.</em> 86: 541-570. Philadelphia.
page(s): 555, pl. 21, fig. 1 [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): 202 [details]
From editor or global species database
Type locality West side of Santa Clara Valley near Los Gatos, elevation about 800 ft., California, United States; Santa Clara Formation, early Pleistocene [details]