| Spine of a sea urchin (Species is unidentified) |
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| Species | Echinodermata - Echinoidea - ??? - ??? |
| Place | Inba-Mura, Chiba-Pref., Japan |
| Epoch | Cenozoic - Quaternary - Pleistocene |
| Size | Length 2.0 mm (upper), 8 mm (lower) |
| File No. | IB039 |
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