original description
Hanna, G. D. (1923). Upper Miocene lacustrine mollusks from Sonoma County, California. <em>Proceedings of the California Academy of Sciences, fourth series.</em> 12(3): 31-41., available online at https://www.biodiversitylibrary.org/page/15974899
page(s): 33, pl. 2, fig. 10 [details]
From editor or global species database
Type locality In canyon about 2.1 miles north, 26° east of Elmore School, and 2.5 miles southeast of Mountain School Road, Petaluma Quadrangle, Sonoma County, California, United States; late Hemphillian, late Miocene to earliest Pliocene [details]