Portlandia japonica (A. Adams & Reeve)
| 1959. | Portlandia japonica (A. Adams & Reeve) Makiyama, J. 1959 pl. 65, fig. 12 |
| 1928. | Yoldia japonica (A. Adams & Reeve) Yokoyama, M. 1928a p. 349, pl. 67, fig. 12 |
| Condition: | Missing |
| Taxonomy: | Mollusca: Bivalvia: Yoldiidae: |
| Geologic Time: | Cenozoic: |
| Makiyama, J., 1959: Matajiro Yokoyama's Tertiary fossils from various localities in Japan. Part 3. Palaeontological Society of Japan, Special Papers, no. 5, pp. 1–4, pls. 58–86. (Reference No. 0369) |
| Yokoyama, M., 1928a: Pliocene shells from Hyuga. Journal of the Faculty of Science, Imperial University of Tokyo, Section 2, vol. 2, pt. 7, pp. 331–350, pls. 66–67. (Reference No. 0494) |
 |
| Ichikawa, T., 1983, no. 9, p. 60. |
| Ichikawa, T., 1983, no. 9, p. 370. |
