Pa 391 Acchoeocidaris keokuk.
| 分類 | Animals: Annuloida: Echinodermata: Echinoidea:Perischoechinidae: |
| 年代 | Paleozoic Carboniferous Lower Carboniferous: |
| 産地 | Illinois. |
| 文献 | Department of Science, Tokio-Daigaku, 1881: Catalogue of Palaeontological Specimens. Middle Case., pp. 1–46. Department of Science, Tokio-Daigaku. |
