Umbonium costatum (Valenciennes)
| 1924. | Umbonium costatum (Valenciennes) |
| Condition: | Present |
| Taxonomy: | Mollusca: Gastropoda: Trochidae: |
| Geologic Time: | Cenozoic: |
| Yokoyama, M., 1924a: Mollusca from the coral-bed of Awa. Journal of the College of Science, Imperial University of Tokyo, vol. 45, art. 1, pp. 1–62 + i–iii, pls. 1–5. (Reference No. 0471) |
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| Ichikawa, T., 1983, no. 9, p. 300. |
