Cyclina shirokiana Yokoyama, 1932
| 1960. | Cyclina shirokiana Yokoyama, 1932 Holotype Oyama, K. et al. 1960 p. 191, pl. 59, fig. 2a, b |
| 1959. | Cyclina ? shirokiana Yokoyama Holotype Makiyama, J. 1959 pl. 84, fig 7 |
| 1932. | Cyclina ? shirokiana Yokoyama, 1932 Holotype Yokoyama, M. 1932a p. 239, pl. 2, fig. 7 |
| Condition: | Present |
| Taxonomy: | Mollusca: Bivalvia: Veneridae: |
| Geologic Time: | Cenozoic: Oligocene: |
| Horizon: | Uryu group: Lower Shiroki formation: |
| 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) |
| Oyama, K., Mizuno, A. and Sakamoto, T., 1960: Illustrated handbook of Japanese Paleogene molluscs., pp. 1–244, pls. 1–71. Geological Survey of Japan. (Reference No. 0412) |
| 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) |
 |
| Ichikawa, T., 1983, no. 9, p. 159. |
| Ichikawa, T., 1983, no. 9, p. 62. |
| Ichikawa, T., 1983, no. 9, p. 389. |
