Common name: Urchins

Diadematidae, commonly known as Diadem Sea Urchins or Long-spined Sea Urchins, are a family of sea urchins characterized by their long, thin spines. These urchins play a crucial role in maintaining the health of coral reefs by grazing on algae that can otherwise overgrow and smother corals. In the aquarium, they require stable water conditions and plenty of live rock to graze on. They are sensitive to sudden changes in water parameters and should be acclimated carefully. Their spines can be sharp and venomous, so handling should be done with care.

1. 
   Common name: Pale spine fire urchin

   Scientific name: Astropyga magnifica
2. 
   Common name: Blue-spotted urchin

   Scientific name: Astropyga radiata
3. 
   Common name: long-spined urchin

   Scientific name: Centrostephanus longispinus
4. 
   Common name: Long-spined Sea Urchin

   Scientific name: Centrostephanus rodgersii
5. 
   Common name: long-spined sea urchin

   Scientific name: Diadema antillarum
6. 
   Common name: Sea urchin

   Scientific name: Diadema savignyi
7. 
   Common name: black longspine urchin

   Scientific name: Diadema setosum
8. 
   Common name: banded sea urchin

   Scientific name: Echinothrix calamaris
9. 
   Common name: Diadema urchin

   Scientific name: Echinothrix diadema