Traits taxon details
original description
Branson, C.C. (1935). Fresh-Water invertebrates from the Morrison (Jurassic?) of Wyoming. <em>Journal of Paleontology.</em> 9(6):514-522., available online at https://www.jstor.org/stable/1298199 page(s): 518-519, pl. 56, figs 7, 11, 14, 16-18 [details] Available for editors 
basis of record
Yen, T.-C. (1952). Molluscan Fauna of the Morrison Formation. <em>United States Geological Survey Professional Paper.</em> 233-B: 21-51. page(s): 37, pl. 3, fig. 7 [details] Available for editors 
additional source
Modell, H. (1957). Die fossilen Najaden Nordamerikas. Ein Klassifizierungsversuch. <em>Archiv für Molluskenkunde.</em> 86(4/6): 183-200. page(s): 194 [details] Available for editors 
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