Septifer nagaoi Oyama, 1951
| 1960. | Septifer nagaoi Oyama, 1951 Holotype Oyama, K. et al. 1960 p. 114, pl. 26, fig. 3a |
| 1959. | Mytilus hirsutus Lamarck Makiyama, J. 1959 pl. 61, figs. 3, 4 |
| 1952. | Septifer (s. s.) nagaoi Oyama Holotype Mizuno, A. 1952 p. 187, pl. 17, fig. 1c |
| 1927. | Mytilus hirsutus Lamarck Yokoyama, M. 1927d p. 187, pl. 50, figs. 3, 4 |
| Condition: | Present |
| Taxonomy: | Mollusca: Bivalvia: Mytilidae: |
| Geologic Time: | Cenozoic: Oligocene: |
| Horizon: | Nishisonoki group: |
| 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) |
| Mizuno, A., 1952: Descriptions of the Paleogene molluscs from Sakito, Nagasaki Prefecture, Japan. Transactions and Proceedings of the Palaeontological Society of Japan. New Series, no. 5, pp. 185–193, pl. 17. (Reference No. 0370) |
| 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., 1927d: Tertiary fossils from western Hizen. Journal of the Faculty of Science, Imperial University of Tokyo, Section 2, vol. 2, pt. 4, pp. 183–190, pl. 50. (Reference No. 0491) |
 |
| Ichikawa, T., 1983, no. 9, p. 159. |
| Ichikawa, T., 1983, no. 9, p. 59. |
| Ichikawa, T., 1983, no. 9, p. 66. |
| Ichikawa, T., 1983, no. 9, p. 367. |
