Tsuda, K., 1959. New Miocene Molluscs from the Kurosedani Formation in Toyama Prefecture, Japan. Journal of the Facility of Science Nigata University, ser. 2. vol. 3 (2 ).
New Species-Group Names:
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toyamaensis Tsuda, 1959. p. 95. pl. V. f. 111-b. 12.
