Pilsbry, H.A. 1933. Zoological results of the Matto Grosso expedition to Brazil in 1931,-II. Mollusca. Proceedings of the Academy of Natural Sciences of Philadelphia 85: 67-76 + 1 plate. Available electronically.

Pilsbry, 1933. Proc. Acad. Nat. Sci. 85: 75, pl. 2, figs. 11-13a.
Type(s): HOLOTYPE ANSP_160187, Rio Sinu, nr. Jaraguay, Colombia.