Combined with Lymnaea by Pierce (1993) but considered to belong in the palustris-group, which at present is attributed to Stagnicola.
Pierce, H.G. (1993). The nonmarine mollusks of the Late Oligocene-Early Miocene Cabbage Patch fauna of western Montana III. Aquatic mollusks and conclusions <em>Journal of Paleontology</em>. 67(6): 980-993