Umbonium giganteum (Lesson)
| 1929. | Umbonium giganteum (Lesson) |
| Condition: | Present |
| Taxonomy: | Mollusca: Gastropoda: Trochidae: |
| Geologic Time: | Cenozoic: |
| Otuka, Y., 1929: A stratigraphical study of the Oiso block and its adjacent area. Part 1. Journal of the Geological Society of Tokyo, vol. 36, no. 433, pp. 435–456, pl. 17. (in Japanese) (Reference No. 0605) |
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| Ichikawa, T., 1988, no. 15, p. 121. |
