Sinum ineptum (Yokoyama)
| 1989. | Sinum ineptum (Yokoyama) Holotype Majima, R. 1989 p. 70, pl. 9, fig. 17a–d |
| 1957. | Sinum ineptum (Yokoyama) Holotype Makiyama, J. 1957 pl. 7, fig. 16 |
| 1923. | Sigaretus ineptus Yokoyama, 1923 Holotype Yokoyama, M. 1923d p. 53, pl. 6, fig. 16 |
| Condition: | Present |
| Taxonomy: | Mollusca: Gastropoda: Naticidae: |
| Geologic Time: | Cenozoic: |
| Majima, R., 1989: Cenozoic fossil Naticidae (Mollusca: Gastropoda) in Japan. Bulletins of American Paleontology, vol. 96, no. 331, pp. 1–159, pls. 1–14. (Reference No. 0660) |
| Makiyama, J., 1957: Matajiro Yokoyama's Tertiary fossils from various localities in Japan. Part 1. Palaeontological Society of Japan, Special Papers, no. 3, pp. 1–4, pls. 1–24. (Reference No. 0367) |
| Yokoyama, M., 1923d: Tertiary fossils from Kii. Japanese Journal of Geology and Geography, vol. 2, no. 3, pp. 47–58, pls. 6–7. (Reference No. 0470) |
| Ichikawa, T., 1995, no. 33, p. 32. |
| Ichikawa, T., 1983, no. 9, p. 45. |
| Ichikawa, T., 1983, no. 9, p. 294. |
