Common name: Strongylocentrotid Urchins

Strongylocentrotidae is a family of sea urchins commonly known as Strongylocentrotid Urchins. Members of this family are characterized by their robust spines and a preference for rocky substrates. They play a crucial role in marine ecosystems by grazing on algae, which helps prevent algal overgrowth on coral reefs. In the aquarium, they can be beneficial for controlling algae, but their strong spines may damage corals if not monitored. They are generally hardy and can adapt to a range of water conditions, making them suitable for both novice and experienced reefkeepers.

1. 
   Common name: Red Sea Urchin

   Scientific name: Mesocentrotus franciscanus
2. 
   Common name: Purple sea urchin

   Scientific name: Strongylocentrotus purpuratus