Trachycardium angustum (Yokoyama)
| 1958. | Trachycardium angustum (Yokoyama) Syntype Makiyama, J. 1958 pl. 28, fig. 2a, b |
| 1925. | Cardium angustum Yokoyama, 1925 Syntype Yokoyama, M. 1925c p. 13, pl. 4, fig. 2a, b |
| Condition: | Present |
| Taxonomy: | Mollusca: Bivalvia: Cardiidae: |
| Geologic Time: | Cenozoic: Pliocene: |
| Makiyama, J., 1958: Matajiro Yokoyama's Tertiary fossils from various localities in Japan. Part 2. Palaeontological Society of Japan, Special Papers, no. 4, pp. 1–6, pls. 25–57. (Reference No. 0368) |
| Yokoyama, M., 1925c: Tertiary Mollusca from Shinano and Echigo. Journal of the Faculty of Science, Imperial University of Tokyo, Section 2, vol. 1, pt. 1, pp. 1–23, pls. 1–7. (Reference No. 0475) |
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| Ichikawa, T., 1983, no. 9, p. 47. |
| Ichikawa, T., 1983, no. 9, p. 313. |
