Common name: Fire Urchin

Asthenosoma is the genus for the Fire Urchin, known for its bright red and orange colors and potent venom. These urchins are captivating but should be handled with care due to their venomous spines, which can cause pain and discomfort if touched. They are primarily nocturnal and feed on algae and detritus. In the aquarium, they require stable water conditions and plenty of live rock to graze on. They can be beneficial for controlling algae growth but may also disturb small or unsecured invertebrates.

1. 
   Common name: Fire Urchin

   Scientific name: Asthenosoma ijimai
2. 
   Common name: variable fire urchin

   Scientific name: Asthenosoma varium