Baryspira okawai (Yokoyama)
| 1964. | Baryspira okawai (Yokoyama) Syntype Shikama, T. 1964 p. 112, pl. 33, fig. 8a, b |
| 1957. | Ancilla (Baryspira) albocallosa (Lischke) Makiyama, J. 1957 pl. 9, fig. 5 |
| 1923. | Ancilla okawai Yokoyama, 1923 Syntype Yokoyama, M. 1923b p. 7, pl. 1, fig. 5 |
| Condition: | Missing |
| Taxonomy: | Mollusca: Gastropoda: Olividae: |
| Geologic Time: | Cenozoic: |
| 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) |
| Shikama, T., 1964a: Index fossils of Japan., pp. 1–287, pls. 1–80. Asakura Shoten, Tokyo. (in Japanese) (Reference No. 0618) |
| Yokoyama, M., 1923b: Tertiary Mollusca from Dainichi in Totomi. Journal of the College of Science, Imperial University of Tokyo, vol. 45, art. 2, pp. 1–18, pls. 1–2. (Reference No. 0468) |
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| Ichikawa, T., 1988, no. 15, p. 173. |
| Ichikawa, T., 1983, no. 9, p. 39. |
| Ichikawa, T., 1983, no. 9, p. 290. |
