Black Longspine Urchin - Diadema setosum

(0)No Reviews yet
SKU: 245639
Manufacturer: That Fish Place
MPN: 0724-urchin

This item is currently out of stock

Add product to cart backorder. A customer service representative will contact you regarding your order

Inventory is real time and can be impacted at any time.

RETAIL STORE ONLY, not available for shipping. Call to confirm availability and price.

Out of Stock


The Black Longspine Urchin (Diadema setosum) is popular and has a very well-known appearance. It has long, thin black spines that extend from its body, and five rows of electric blue spots in asymmetrical design on the body. The anus of the urchin looks like an eye on the top of the body, with a bright orange ring in the center. While the body itself is usually only about 2 to 3 inches in diameter, the spines can make this urchin up to 12 inches across.

The spines on this urchin can break off easily and become embedded in the skin of a tankmate (or an aquarist) that bumps against them. Take care when maintaining the aquarium to avoid bumping against this urchin or its spines and do not place it in a small aquarium where it may come into contact with crowded tankmates. These urchins are mildly venomous. The venom is very mild but wounds from this urchin can still be painful as the spines themselves are needle-like and covered in bacteria so wounds can easily become infected quickly.

These urchins are grazers that will roam about the tank searching for food and algae on the substrate and rockwork. They will not actively eat corals, but some delicate corals may be damaged if the urchin crawls on top of them or knocks them over with its long spines. Urchins have also been known to eat coralline algae desirable to some aquarists.


That Fish Place
Common NameBlack Longspine Urchin
Scientific NameDiadema setosum
Reef SafeYes
Invert SafeYes
DifficultyEasy to Moderate
Specific Gravity Range1.022-1.026
pH Range8.0-8.4
Temperature Range75-82
VenomousYes, slightly
Internal Id

State Restrictions
Armed Forces Americas
Armed Forces Europe
Armed Forces Pacific
Puerto Rico

Ratings & Reviews

No reviews available

Be the first to Write a Review