Combined with Lymnaea by Pierce & Constenius (2001) but considered to belong in the emarginata-group, which is at ... [details]
Genus misspelt as "Rhodacmaea" in heading of description. [details]
Locality M-5, 48.309770°N, 113.612685°W, Middle Fork Flathead River, Flathead County, Montana, Montana, United ... [details]
Locality M-2, 48.299273°N, 113.606557°W, Middle Fork Flathead River, Flathead County, Montana, United States [details]
Locality M-5, 48.309770°N, 113.612685°W, Middle Fork Flathead River, Flathead County, Montana, Montana, United ... [details]
Locality M-28, 48.385147°N, 113.685528°W, Middle Fork Flathead River, Flathead County, Montana, United States; ... [details]
From the middle sequence of the Coal Creek Member, Kishenehn Formation, Locality M-40, Bed MCC-50, 48.421741°N, ... [details]
Locality M-3, 48.303197°N, 113.612811°W, Middle Fork Flathead River, Flathead County, Montana, United States [details]
Locality M-28R, 48.386812°N, 113.684491°W, Middle Fork Flathead River, Flathead County, Montana, United States; ... [details]
From the upper sequence of the Coal Creek Member, Kishenehn Formation, Locality M-28, 48.385147°N, 113.685528°W, ... [details]
Locality M-2, 48.299273°N, 113.606557°W, Middle Fork Flathead River, Flathead County, Montana, United States [details]