MolluscaBase taxon details
original description
(of Cyrena verecunda Yokoyama, 1932 †) 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): 242, pl. 3, fig. 5 [details] Available for editors [request]
basis of record
Oyama, K., Mizuno, A. & Sakamoto, T. (1960) Illustrated Handbook of Japanese Paleogene Molluscs. Geological Survey of Japan, Tokyo, 244 pp., 71 pls. [details]