Diadema clarki Ikeda, 1939
Shell diameter: 3 cm
Locality: Kotoura, Sado Is. Depth: 10 m
Environment: rocky reef
Water temperature: 19°C
Date: Nov, 2022 Photographer: Akihito Omori
| Phylum | Echinodermata |
| Class | Echinoidea |
| Order | Diadematoida |
| Family | Diadematidae |
Close-up picture around an anal cone