Traits name details
original description
Meek, F. B.; Hayden, F. V. (1857). Descriptions of new genera of fossils, collected by Dr. F.V. Hayden, in Nebraska territory, under the direction of Lieut. G.K. Warren, US Topographical Engineer; with some remarks on the Tertiary and Cretaceous formations of the north-west, and parallelism of the latter with those of other portions of the United States and Territories. <em>Proceedings of the Academy of Natural Sciences of Philadelphia.</em> 9: 117–148., available online at https://www.biodiversitylibrary.org/page/6330383 page(s): 143 [details]
new combination reference
Henderson, J. (1935). Fossil non-marine Mollusca of North America. <em>Geological Society of America Special Papers.</em> 3: 1-313. page(s): 101 [details] Available for editors 
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