Harpoceras (s. s.) okadai (Yokoyama)
| 1957. | Harpoceras (s. s.) okadai (Yokoyama) Sato, T. 1957 p. 345, pl. 2, fig. 9 |
| Condition: | Present |
| Taxonomy: | Mollusca: Cephalopoda: |
| Geologic Time: | Mesozoic: |
| Sato, T., 1957: Biostratigraphie de la série de Shizukawa (Jurassique inférieur) du Japon septentrional. Journal of the Faculty of Science, University of Tokyo, Section 2, vol. 10, pt. 3, pp. 313–350, pls. 1–2. (Reference No. 0269) |
| Ichikawa, T. and Hayami, I., 1978, no. 2, p. 250. |
