Diplodonta tokunagai Yokoyama
| 1958. | Diplodonta tokunagai Yokoyama Syntype Makiyama, J. 1958 pl. 33, fig. 15 |
| 1925. | Diplodonta tokunagai Yokoyama, 1925 Syntype Yokoyama, M. 1925d p. 121, pl. 15, fig. 5 |
| Condition: | Present |
| Taxonomy: | Mollusca: Bivalvia: Ungulinidae: |
| Geologic Time: | Cenozoic: Oligocene: |
| Horizon: | Akahira group: Tsuyako formation: |
| Makiyama, J., 1958: Matajiro Yokoyama's Tertiary fossils from various localities in Japan. Part 2. Palaeontological Society of Japan, Special Papers, no. 4, pp. 1–6, pls. 25–57. (Reference No. 0368) |
| Yokoyama, M., 1925d: Mollusca from the Tertiary basin of Chichibu. Journal of the Faculty of Science, Imperial University of Tokyo, Section 2, vol. 1, pt. 3, pp. 111–126, pls. 14–15. (Reference No. 0476) |
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| Ichikawa, T., 1983, no. 9, p. 48. |
| Ichikawa, T., 1983, no. 9, p. 316. |
