| 1973. | Umbonium (Suchium) akitanum Suzuki Chinzei, K. 1973 p. 90, pl. 14, fig. 11 |
| Condition: | Present |
| Taxonomy: | Mollusca: Gastropoda: Trochidae: |
| Geologic Time: | Cenozoic: Pliocene: |
| Chinzei, K., 1973: Omma-Manganjian molluscan fauna in the Futatsui area of northern Akita, Japan. Transactions and Proceedings of the Palaeontological Society of Japan. New Series, no. 90, pp. 81–94, pl. 14. (Reference No. 0339) |
 |
| Ichikawa, T., 1983, no. 9, p. 13. |
