Common name: Radiant Sea Urchin

Astropyga is a genus of sea urchins commonly known as Radiant Sea Urchins or Blue-Spotted Sea Urchins. They are notable for their bright colors and prominent spines, which can be a hazard to unwary aquarists. These urchins are often found in tropical reefs and are known for their algae-grazing habits, which can be beneficial in controlling algae growth in aquariums. They require stable water conditions and plenty of live rock to thrive. Astropyga species are also interesting for their symbiotic relationships with various marine organisms, including shrimps and crabs that live among their spines for protection.

1. 
   Common name: Pale spine fire urchin

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

   Scientific name: Astropyga radiata