| 1973. | Neptunea (Neptunea) yokoyamai Oyama in Taki & Oyama, 1954 Paratype Oyama, K. 1973 p. 42, pl. 13, fig. 2a, b |
| 1954. | Neptunea yokoyamai Oyama Paratype Taki, I. & Oyama, K. 1954 pl. 3, fig. 10a, b |
| 1920. | Chrysodomus phoeniceus Dall Yokoyama, M. 1920 p. 50, pl. 2, fig. 10a, b |
| Condition: | Present |
| Taxonomy: | Mollusca: Gastropoda: Buccinidae: |
| Geologic Time: | Cenozoic: Pliocene: |
| Horizon: | Kazusa Group: Koshiba Formation: |
| Locality: | Kanagawa: Kanazawa-shiba-machi, Kanazawa-ku, Yokohama: Koshiba: |
| 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) |
  |
| Ichikawa, T., 1983, no. 9, p. 119. |
| Ichikawa, T., 1983, no. 9, p. 187. |
| Ichikawa, T., 1983, no. 9, p. 253. |
