Opis ( Trigonopis ) trigonalis Tamura
| 1959. | Opis (Trigonopis) trigonalis Tamura Paratype Tamura, M. 1959d p. 114, pl. 12, fig. 14 |
| Condition: | Present |
| Taxonomy: | Mollusca: Bivalvia: Astartidae: |
| Geologic Time: | Mesozoic: |
| Tamura, M., 1959d: Some pelecypods from the Upper Jurassic Sakamoto formation in central Kyushu, Japan. Transactions and Proceedings of the Palaeontological Society of Japan. New Series, no. 35, pp. 113–120, pl. 12. (Reference No. 0290) |
| Ichikawa, T. and Hayami, I., 1978, no. 2, p. 269. |
