Traits name details
original description
Maury, C.J. (1902). A comparison of the Oligocene of western Europe and the southern United States. Bulletins of American Paleontology, 3(15): 311-404, available online at https://biodiversitylibrary.org/page/30375766 page(s): 389, pl. 29, fig. 4 [details]
basis of record
Henderson, J. (1935). Fossil non-marine Mollusca of North America. <em>Geological Society of America Special Papers.</em> 3: 1-313. page(s): 93 [details] Available for editors 
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