Umbonium costatum (Valenciennes)
| 1927. | Umbonium costatum (Valenciennes) |
| Condition: | Missing |
| Taxonomy: | Mollusca: Gastropoda: Trochidae: |
| Geologic Time: | Cenozoic: |
| Yokoyama, M., 1927b: Mollusca from the upper Musashino of western Shimosa and southern Musashi. Journal of the Faculty of Science, Imperial University of Tokyo, Section 2, vol. 1, pt. 10, pp. 439–457, pls. 51–52. (Reference No. 0489) |
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| Ichikawa, T., 1983, no. 9, p. 359. |
