Traits taxon details
original description
Suzuki, K. (1942). The Tertiary Naiads of Hokkaidō in the collection of the Department of Geology and Mineralogy Faculty of Science, Hokkaidō Imperial University. <em>Japanese Journal of Geology and Geography.</em> 18(4): 141-156. page(s): 154-155, pl. 18, fig. 2a, b [details] Available for editors 
additional source
Oyama, K., Mizuno, A. & Sakamoto, T. (1960) Illustrated Handbook of Japanese Paleogene Molluscs. Geological Survey of Japan, Tokyo, 244 pp., 71 pls. page(s): 136-137, pl. 38, fig. 3a-d [details]
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