Tresus keenae (Kuroda & Habe)
| 1973. | Tresus keenae (Kuroda & Habe) Oyama, K. 1973 p. 109, pl. 51, fig. 5a, b |
| 1954. | Schizothaerus keenae Kuroda & Habe Taki, I. & Oyama, K. 1954 pl. 27, fig. 13 |
| 1922. | Mactra ovalina Lamarck Yokoyama, M. 1922a p. 127, pl. 7, fig. 13 |
| Condition: | Present |
| Taxonomy: | Mollusca: Bivalvia: Mactridae: |
| Geologic Time: | Cenozoic: |
| Horizon: | Imba Formation: |
| Locality: | Chiba: Shonan-cho: Tega: |
| 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., 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) |
  |
| Ichikawa, T., 1983, no. 9, p. 138. |
| Ichikawa, T., 1983, no. 9, p. 206. |
| Ichikawa, T., 1983, no. 9, p. 275. |
