| 2010. | Indet. Matsubara, T. et al. 2010 p. 41, fig. 4.3a,b |
| 1883. | Indet. Kochibe, T. 1883 p. 75, pl. 5, fig. 2 |
| 1957. | Chlamys (Swiftopecten) swiftii Bernardi Makiyama, J. 1957 pl. 17, fig. 1 |
| 1925. | Pecten swiftii Bernardi Yokoyama, M. 1925a p. 27, pl. 2, fig. 1 |
| Condition: | Present |
| Taxonomy: | : |
| Kochibe, T., 1883: Geologic outlines of North Hitachi. Memoirs of the Science Department, Tokio Daigaku (University of Tokio), Japanese Edition, no. 4 Supplement, pp. i–viii + 1–153 + 1–2, pls. 1–9. (in Japanese) (Reference No. 0931) |
| Makiyama, J., 1957: Matajiro Yokoyama's Tertiary fossils from various localities in Japan. Part 1. Palaeontological Society of Japan, Special Papers, no. 3, pp. 1–4, pls. 1–24. (Reference No. 0367) |
| Matsubara, T., Sasaki, T. and Ito, Y., 2010: The first Cenozoic molluscan article by the Japanese student (Kochibe, 1883) and finding of its illustrated specimens. Fossils, no. 88, pp. 39–48. (in English with Japanese abstract) (Reference No. 0900) |
| Yokoyama, M., 1925a: Molluscan remains from the uppermost part of the Jo-ban coal-field. Journal of the College of Science, Imperial University of Tokyo, vol. 45, art. 5, pp. 1–34, pls. 1–6. (Reference No. 0473) |
  |
| no. 00, p. . |
| no. 00, p. . |
| Ichikawa, T., 1983, no. 9, p. 43. |
| Ichikawa, T., 1983, no. 9, p. 305. |
