Traits name details
original description
Olsson A.A. & Petit R.E. (1964). Some Neogene Mollusca from Florida and the Carolinas. <em>Bulletins of American Paleontology.</em> 47(217): 505-574, pls 77-83., available online at https://www.biodiversitylibrary.org/page/28908084 page(s): 547 [details]
additional source
Vokes, E. H. (1966). The genus <i>Vasum</i> (Mollusca: Gastropoda) in the New World. <em>Tulane Studies in Geology and Paleontology.</em> 5(1): 1-36. page(s): 21 [details] Available for editors
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