Yokoyama, M. (1931). Neogene shells from Karafto and the Hokkaido. <em>Journal of the Faculty of Science, Imperial University of Tokyo. Section II, Geology, Mineralogy, Geography, Seismology.</em> 3(4): 185-196. page(s): 194-195, pl. 11, fig. 8 [details] Available for editors [request]
Note The Mukawa at its junction with a tributary...
From editor or global species database
Type locality The Mukawa at its junction with a tributary called Shikerepe, Iburi (Hokkaido, Japan) [details]
Fossil range Age range uncertain - originally described from "Neogene" deposits, but some records were later attributed to the upper...
Fossil range Age range uncertain - originally described from "Neogene" deposits, but some records were later attributed to the upper Eocene "Porosin" (= Poronai) Formation (Ôtatume 1943). [details]
original descriptionYokoyama, M. (1931). Neogene shells from Karafto and the Hokkaido. <em>Journal of the Faculty of Science, Imperial University of Tokyo. Section II, Geology, Mineralogy, Geography, Seismology.</em> 3(4): 185-196. page(s): 194-195, pl. 11, fig. 8 [details] Available for editors [request]
Present Inaccurate Introduced: alien Containing type locality
From editor or global species database
Fossil range Age range uncertain - originally described from "Neogene" deposits, but some records were later attributed to the upper Eocene "Porosin" (= Poronai) Formation (Ôtatume 1943). [details] Type locality The Mukawa at its junction with a tributary called Shikerepe, Iburi (Hokkaido, Japan) [details]
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