Calliostoma unicum Yokoyama
| 1959. | Calliostoma unicum Yokoyama Holotype Makiyama, J. 1959 pl. 83, fig. 11 |
| 1932. | Calliostoma subunicum Yokoyama, 1932 Holotype Yokoyama, M. 1932a p. 238, pl. 1, fig. 11 |
| Condition: | Present |
| Taxonomy: | Mollusca: Gastropoda: Trochidae: |
| Geologic Time: | Cenozoic: |
| Horizon: | Middle Okada beds: |
| Makiyama, J., 1959: Matajiro Yokoyama's Tertiary fossils from various localities in Japan. Part 3. Palaeontological Society of Japan, Special Papers, no. 5, pp. 1–4, pls. 58–86. (Reference No. 0369) |
| Yokoyama, M., 1932a: Tertiary Mollusca from the coalfield of Uryu, Ishikari. Journal of the Faculty of Science, Imperial University of Tokyo, Section 2, vol. 3, pt. 6, pp. 221–247, pls. 1–4. (Reference No. 0503) |
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| Ichikawa, T., 1983, no. 9, p. 62. |
| Ichikawa, T., 1983, no. 9, p. 389. |
