Traits taxon details
original description
Yen, T.-C. (1951). Fresh-Water Mollusks of Cretaceous Age From Montana and Wyoming. Part 1: A fluviatile fauna from the Kootenai formation near Harlowton, Montana. <em>United States Geological Survey Professional Paper.</em> 233-A: 1-9., available online at https://doi.org/10.21236/ada296486 page(s): 6, pl. 1, fig. 8 [details] Available for editors
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