original description
Hanna, G. D. (1923). Expedition of the California Academy of Sciences to the Gulf of California in 1921. Land and freshwater mollusks. <em>Proceedings of the California Academy of Sciences.</em> ser. 4, 12(26): 483-527, pls 7-11., available online at https://www.biodiversitylibrary.org/page/26874971
page(s): 490, pl. 7, fig. 11, pl. 11, figs. 2, 4 [details]
From editor or global species database
Type locality "west of Ruffo's ranch house, Ceralbo Island, Gulf of California" [details]