Petaloconchus ( Macrophragma ? ) annulatus (Yokoyama, 1924)
| 1973. | Petaloconchus (Macrophragma ?) annulatus (Yokoyama, 1924) Holotype Oyama, K. 1973 p. 22, pl. 4, fig. 17 |
| 1954. | Vermetus annulatus Yokoyama, 1924 Holotype Taki, I. & Oyama, K. 1954 pl. 39, fig. 2 |
| 1924. | Vermetus annulatus Yokoyama, 1924 Holotype Yokoyama, M. 1924a p. 25, pl. 2, fig. 2 |
| Condition: | Present |
| Taxonomy: | Mollusca: Gastropoda: Vermetidae: |
| Geologic Time: | Cenozoic: Holocene: |
| Locality: | Chiba: Tateyama: Numa: |
| 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., 1924a: Mollusca from the coral-bed of Awa. Journal of the College of Science, Imperial University of Tokyo, vol. 45, art. 1, pp. 1–62 + i–iii, pls. 1–5. (Reference No. 0471) |
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| Ichikawa, T., 1983, no. 9, p. 145. |
| Ichikawa, T., 1983, no. 9, p. 212. |
| Ichikawa, T., 1983, no. 9, p. 296. |
