Long Spine Urchin
Diadema setosum
Diadema · Black Long Spine
Urchins
A dramatic urchin with very long, sharp, venomous spines. Extremely effective algae grazers but handle with care — stings are painful. Best for larger tanks where their spines have clearance.
Difficulty Moderate
Reef Safe Caution
Temperament Peaceful
Available Stock
2 Long Spine Urchin listings in stock across 2 Australian reef shops, from $10 to $40 (median $25), as of 2026-08-23.
Shops with stock
- Australian Coral Farms 1 from $10
- Ocean Reefs Marine 1 from $40
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