Traits taxon details
original description
(of ) Yokoyama M. (1928). Neogene shells from the oil-field of Higashiyama, Echigo. <em>Journal of the Faculty of Science, Imperial University of Tokyo. Section II, Geology, Mineralogy, Geography, Seismology.</em> 2(7): 351–362, pls. 68–69., available online at http://umdb.um.u-tokyo.ac.jp/DKoseibu/pdf/Ref_0495_.pdf page(s): 360 [details]
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