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
4 Long Spine Urchin listings in stock across 3 Australian reef shops, from $10 to $40 (median $30), as of 2026-10-14.
Shops with stock
- Ocean Reefs Marine 2 from $35
- Australian Coral Farms 1 from $10
- Nature Aquariums 1 from $25
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