Macoma optiva (Yokoyama, 1923)
| 1960. | Macoma optiva (Yokoyama, 1923) Paralectotype Oyama, K. et al. 1960 p. 198, pl. 60, fig. 9a |
| 1957. | Macoma optiva (Yokoyama) Syntype Makiyama, J. 1957 pl. 6, fig. 4 |
| 1923. | Tellina optiva Yokoyama, 1923 Syntype Yokoyama, M. 1923c p. 6, pl. 2, fig. 4 |
| Condition: | Present |
| Taxonomy: | Mollusca: Bivalvia: Tellinidae: |
| Geologic Time: | Cenozoic: Oligocene? - Pliocene: |
| Horizon: | Fujina formation: |
| Makiyama, J., 1957: Matajiro Yokoyama's Tertiary fossils from various localities in Japan. Part 1. Palaeontological Society of Japan, Special Papers, no. 3, pp. 1–4, pls. 1–24. (Reference No. 0367) |
| 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., 1923c: On some fossil Mollusca from the Neogene of Izumo. Japanese Journal of Geology and Geography, vol. 2, no. 1, pp. 1–9, pls. 1–2. (Reference No. 0469) |
| Ichikawa, T., 1983, no. 9, p. 158. |
| Ichikawa, T., 1983, no. 9, p. 45. |
| Ichikawa, T., 1983, no. 9, p. 293. |
