Spirorbis perplanorbis (Yokoyama, 1927)
| 1973. | Spirorbis perplanorbis (Yokoyama, 1927) Holotype Oyama, K. 1973 p. 121, pl. 4, fig. 18 |
| 1954. | Spirorbis perplanorbis (Yokoyama, 1927) Holotype Taki, I. & Oyama, K. 1954 pl. 48, fig. 14 |
| 1927. | Vermetus perplanorbis Yokoyama, 1927 Holotype Yokoyama, M. 1927b p. 450, pl. 51, fig. 14 |
| Condition: | Present |
| Taxonomy: | Mollusca: Gastropoda: Planorbidae: |
| Geologic Time: | Cenozoic: Pleistocene: |
| Horizon: | Shimosueyoshi Formation: |
| Locality: | Kanagawa: Kohoku-ku, Yokohama: Koyasu: |
| 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., 1927b: Mollusca from the upper Musashino of western Shimosa and southern Musashi. Journal of the Faculty of Science, Imperial University of Tokyo, Section 2, vol. 1, pt. 10, pp. 439–457, pls. 51–52. (Reference No. 0489) |
 |
| Ichikawa, T., 1983, no. 9, p. 152. |
| Ichikawa, T., 1983, no. 9, p. 219. |
| Ichikawa, T., 1983, no. 9, p. 356. |
