| 1957. | Umbonium (Suchium) mysticum Yokoyama Syntype Makiyama, J. 1957 pl. 10, fig. 6 |
| 1923. | Umbonium mysticum Yokoyama, 1923 Syntype Yokoyama, M. 1923b p. 13, pl. 2, fig. 6 |
| Condition: | Missing |
| Taxonomy: | Mollusca: Gastropoda: Trochidae: |
| Geologic Time: | Cenozoic: Pliocene: |
| Horizon: | Kakegawa group: |
| 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) |
| Yokoyama, M., 1923b: Tertiary Mollusca from Dainichi in Totomi. Journal of the College of Science, Imperial University of Tokyo, vol. 45, art. 2, pp. 1–18, pls. 1–2. (Reference No. 0468) |
  |
| Ichikawa, T., 1983, no. 9, p. 39. |
| Ichikawa, T., 1983, no. 9, p. 291. |
