Quadraticephalus calchas (Walcott)
| 1933. | Quadraticephalus calchas (Walcott) Kobayashi, T. 1933c p. 121, pl. 11, fig. 13 |
| Condition: | Present |
| Taxonomy: | Arthropoda: |
| Geologic Time: | Paleozoic: |
| Kobayashi, T., 1933c: Upper Cambrian of the Wuhutsui basin, Liaotung, with special reference to the limit of the Chaumitian (or Upper Cambrian) of eastern Asia, and its subdivision. Japanese Journal of Geology and Geography, vol. 11, nos. 1–2, pp. 55–155, pls. 9–15. (Reference No. 0082) |
 PDF in prep. |
| Ichikawa, T. and Hayami, I., 1978, no. 2, p. 75. |
