Buccinum graciale morchianum (Dunker)
| 1960. | Buccinum graciale morchianum (Dunker) Makiyama, J. 1960 pl. 119, fig. 1 |
| 1960. | Trominina onnaica (Yokoyama) Holotype Oyama, K. et al. 1960 p. 64, pl. 10, fig. 3c |
| 1932. | Melongena onnaica Yokoyama, 1932 Holotype Yokoyama, M. 1932b p. 11, pl. 4, fig. 1 |
| Condition: | Present |
| Taxonomy: | Mollusca: Gastropoda: Buccinidae: |
| Geologic Time: | Cenozoic: |
| Makiyama, J., 1960: Matajiro Yokoyama's Tertiary fossils from various localites in Japan. Part 4. Palaeontological Society of Japan, Special Papers, no. 6, pp. 1–15, pls. 87–119. (Reference No. 0575) |
| 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. 0608) |
| Yokoyama, M., 1932b: Neogene shells from south Karafto. Imperial Geological Survey of Japan, Report, no. 111, pp. 1–15, pls. 1–4. (Reference No. 0641) |
| Ichikawa, T., 1988, no. 15, p. 93. |
| Ichikawa, T., 1988, no. 15, p. 134. |
| Ichikawa, T., 1988, no. 15, p. 198. |
