Sinum ineptum (Yokoyama)
| 1989. | Sinum ineptum (Yokoyama) Majima, R. 1989 p. 70, pl. 9, fig. 12a–c |
| 1934. | Sinum yabei Otuka, 1934 Holotype PreviousNo: 1561 |
| 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) |
| Otuka, Y., 1934a: Tertiary structures of the northwestern end of the Kitakami mountainland, Iwate Prefecture, Japan. Bulletin of the Earthquake Research Institute, Tokyo Imperial University, vol. 12, pt. 3, pp. 566–638, pls. 44–51. (Reference No. 0384) |
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| Ichikawa, T., 1995, no. 33, p. 31. |
| Ichikawa, T., 1983, no. 9, p. 84. |
