Polynemamussium intuscostatum (Yokoyama, 1920)
| 1973. | Polynemamussium intuscostatum (Yokoyama, 1920) Syntype Oyama, K. 1973 p. 83, pl. 33, fig. 1a, b |
| 1954. | Polynemamussium intuscostatum (Yokoyama, 1920) Syntype Taki, I. & Oyama, K. 1954 pl. 14, fig. 9a, b |
| 1920. | Pecten intuscostatus Yokoyama, 1920 Syntype Yokoyama, M. 1920 p. 156, pl. 13, fig. 9a, b |
| Condition: | Present |
| Taxonomy: | Mollusca: Bivalvia: Propeamussiidae: |
| Geologic Time: | Cenozoic: Pleistocene: |
| Horizon: | Imba Group: |
| Locality: | Chiba: Ichihara: Shito: |
| Oyama, K., 1973: Revision of Matajiro Yokoyama's type Mollusca from the Tertiary and Quaternary of the Kanto area. Palaeontological Society of Japan, Special Papers, no. 17, pp. 1–148, pls. 1–57. (Reference No. 0411) |
| Taki, I. and Oyama, K., 1954: Matajiro Yokoyama's the Pliocene and later faunas from the Kwanto region in Japan. Palaeontological Society of Japan, Special Papers, no. 2, pp. 1–68, pls. 1–49. (Reference No. 0441) |
| Yokoyama, M., 1920: Fossils from the Miura peninsula and its immediate north. Journal of the College of Science, Imperial University of Tokyo, vol. 39, art. 6, pp. 1–193, pls. 1–20. (Reference No. 0464) |
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| Ichikawa, T., 1983, no. 9, p. 128. |
| Ichikawa, T., 1983, no. 9, p. 196. |
| Ichikawa, T., 1983, no. 9, p. 260. |
