Siphonalia declivis Yokoyama
| 1958. | Siphonalia declivis Yokoyama Syntype Makiyama, J. 1958 pl. 50, fig. 21 |
| 1926. | Siphonalia declivis Yokoyama, 1926 Syntype Yokoyama, M. 1926g p. 337, pl. 38, fig. 21 |
| Condition: | Missing |
| Taxonomy: | Mollusca: Gastropoda: Buccinidae: |
| Geologic Time: | Cenozoic: Pliocene: |
| Horizon: | Satsuka beds: |
| Makiyama, J., 1958: Matajiro Yokoyama's Tertiary fossils from various localities in Japan. Part 2. Palaeontological Society of Japan, Special Papers, no. 4, pp. 1–6, pls. 25–57. (Reference No. 0368) |
| Yokoyama, M., 1926g: Tertiary Mollusca from southern Totomi. Journal of the Faculty of Science, Imperial University of Tokyo, Section 2, vol. 1, pt. 9, pp. 313–364, pls. 38–41. (Reference No. 0484) |
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| Ichikawa, T., 1983, no. 9, p. 55. |
| Ichikawa, T., 1983, no. 9, p. 334. |
