Traits taxon details
original description
(of Unio stewardi utahensis Yen, 1952 †) Yen, T.-C. (1952). Molluscan Fauna of the Morrison Formation. <em>United States Geological Survey Professional Paper.</em> 233-B: 21-51. page(s): 36, pl. 3, fig. 3a-e [details] Available for editors
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