Key Identification Features
- Diadema savignyi (Audouin, 1809) typically has a black, spherical, slightly flattened test reaching up to around 9 cm (3.
- setosum by several physical features: it has iridescent green or blue lines in its interambulacral areas and around the periproct, the cone-shaped region that surrounds the anus.
- It can be distinguished from the related species Echinothrix calamaris by several features: E.
- Another similar species is Diadema setosum, which has longer spines and a smaller test; the key distinguishing feature of D.
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