Mactra semmiana Yokoyama
| 1929. | Mactra semmiana Yokoyama |
| Condition: | Missing |
| Taxonomy: | Mollusca: Bivalvia: Mactridae: |
| Geologic Time: | Cenozoic: |
| Yokoyama, M., 1929b: Molluscan fossils from Karafto. Journal of the Faculty of Science, Imperial University of Tokyo, Section 2, vol. 2, pt. 9, pp. 369–398, pls. 71–76. (Reference No. 0497) |
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| Ichikawa, T., 1983, no. 9, p. 380. |
