Macoma optiva (Yokoyama)
| 1964. | Macoma optiva (Yokoyama) Shikama, T. 1964 p. 142, pl. 48, fig. 8a, b |
| 1958. | Macoma optiva (Yokoyama) Makiyama, J. 1958 pl. 14, fig. 2 |
| 1952. | Macoma optiva (Yokoyama) Shikama, T. 1952 p. 150, pl. 37, fig. 13 |
| 1943. | Tellina optiva Yokoyama Shikama, T. 1943 p. 235, pl. 37, fig. 13 |
| 1926. | Tellina optiva Yokoyama Yokoyama, M. 1926e p. 242, pl. 30, fig. 2 |
| Condition: | Missing |
| Taxonomy: | Mollusca: Bivalvia: Tellinidae: |
| Geologic Time: | Cenozoic: |
| 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) |
| Shikama, T., 1943: A handbook of illustrated fossils from Japanese and their adjacent territories., pp. 1–279, pls. 1–46. Nippon Koubutu Syumi-no-kai, Kyoto. (in Japanese) (Reference No. 0616) |
| Shikama, T., 1952: A handbook of illustrated fossils from Japanese and their adjacent territories., pp. 1–376, pls. 1–57. Nippon Koubutu Syumi-no-kai, Kyoto. (in Japanese) (Reference No. 0617) |
| Shikama, T., 1964a: Index fossils of Japan., pp. 1–287, pls. 1–80. Asakura Shoten, Tokyo. (in Japanese) (Reference No. 0618) |
| Yokoyama, M., 1926e: Tertiary Mollusca from the oil-fields of Embets and Etaibets. Journal of the Faculty of Science, Imperial University of Tokyo, Section 2, vol. 1, pt. 7, pp. 235–248, pls. 30–32. (Reference No. 0482) |
 |
| Ichikawa, T., 1988, no. 15, p. 175. |
| Ichikawa, T., 1983, no. 9, p. 51. |
| Ichikawa, T., 1988, no. 15, p. 156. |
| Ichikawa, T., 1988, no. 15, p. 146. |
| Ichikawa, T., 1983, no. 9, p. 324. |
