Traits name details
original description
Yen, T.-C. (1951). Fresh-Water Mollusks of Cretaceous Age From Montana and Wyoming. Part 2: An Upper Cretaceous nonmarine molluscan fauna from the Leeds Creek area, Lincoln County, Wyoming <em>United States Geological Survey Professional Paper</em>. 233-A: 11-18 page(s): 16-17, pl. 2, fig. 13a-c [details]
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