Traits name details
original description
Yokoyama M. (1932). Tertiary Mollusca from the Coalfield of Uryu, Ishikari. <em>Journal of the Faculty of Science, Imperial University of Tokyo. Section II, Geology, Mineralogy, Geography, Seismology.</em> 3(6): 221-247., available online at http://umdb.um.u-tokyo.ac.jp/DKoseibu/pdf/Ref_0503_.pdf page(s): 237, pl. 1, figs 2-3 [details] Available for editors 
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