Cuspidaria ( Plectodon ) ligula Yokoyama, 1922
| 1973. | Cuspidaria (Plectodon) ligula Yokoyama, 1922 Lectotype Oyama, K. 1973 p. 121, pl. 57, fig. 22a, b |
| 1964. | Cuspidaria (Plectodon) ligula Yokoyama Syntype Shikama, T. 1964 p. 144, pl. 49, fig. 31a, b |
| 1954. | Cuspidaria (Plectodon) ligula Yokoyama, 1922 Lectotype Taki, I. & Oyama, K. 1954 pl. 34, fig. 3 |
| 1922. | Cuspidaria ligula Yokoyama, 1922 Syntype Yokoyama, M. 1922a p. 169, pl. 14, fig. 3 |
| Condition: | Present |
| Taxonomy: | Mollusca: Bivalvia: Cuspidariidae: |
| 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) |
| Shikama, T., 1964a: Index fossils of Japan., pp. 1–287, pls. 1–80. Asakura Shoten, Tokyo. (in Japanese) (Reference No. 0618) |
| 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., 1922a: Fossils from the upper Musashino of Kazusa and Shimosa. Journal of the College of Science, Imperial University of Tokyo, vol. 44, art. 1, pp. 1–200 + i–viii, pls. 1–17. (Reference No. 0465) |
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| Ichikawa, T., 1983, no. 9, p. 141. |
| Ichikawa, T., 1988, no. 15, p. 173. |
| Ichikawa, T., 1983, no. 9, p. 209. |
| Ichikawa, T., 1983, no. 9, p. 278. |
