Izumonauta tokunagai Yokoyama
| 1956. | Izumonauta tokunagai Yokoyama Paratype Kobayashi, T. 1956f p. 102, text-figs. c, d |
| 1913. | Argonauta tokunagai Yokoyama, 1913 Syntype Yokoyama, M. 1913 p. 1, pl. 8, figs. 1, 2 |
| Condition: | Present |
| Taxonomy: | Mollusca: Cephalopoda: |
| Geologic Time: | Cenozoic: Palaeogene: |
| Horizon: | Huzina formation: |
| Kobayashi, T., 1956f: A palaeo-meteorological interpretation to the occurence of the Argonautinae in Province Kaga, central Japan. Japanese Journal of Geology and Geography, vol. 27, nos. 2–4, pp. 93–104, pl. 6. (Reference No. 0362) |
| Yokoyama, M., 1913: On two new fossil Cephalopoda from the Tertiary of Izumo. Journal of the Geological Society of Tokyo, vol. 20, no. 243, pp. 1–3, pls. 7–8. (Reference No. 0463) |
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| Ichikawa, T., 1983, no. 9, p. 36. |
| Ichikawa, T., 1983, no. 9, p. 251. |
