Pratt, W.H. 1876. Description of a Unio shell found on the south bank of the Mississippi River, opposite the Rock Island Arsenal, in 1870. Proceedings of the Davenport Academy of Natural Sciences 1. Available electronically.
Pratt, 1876. Proc. Davenport Acad. Nat. Sci. 1: 168, pl. 31, fig. 1a-b [as ‘unul atus’; corrected in Errata].
(correct name for Unio unul atus Pratt, 1876)
Pratt, 1876. Proc. Davenport Acad. Nat. Sci. 1: 168.
(incorrect original spelling of Unio lunulatus Pratt, 1876)