Common name: black longspine urchin

General information

The Long-spined Sea Urchin, Diadema setosum, is a widely recognized echinoderm, known for its long, thin, and potentially venomous spines. This species plays a crucial role in maintaining the balance of coral reef ecosystems by grazing on algae that can otherwise overwhelm corals.

Care

In the aquarium, Diadema setosum requires a tank with plenty of live rock and a stable environment to thrive. They are sensitive to water quality and require consistent levels of calcium for their exoskeleton. It's important to handle them with care due to their venomous spines, which can cause painful stings.

Reproduction

These sea urchins reproduce by releasing gametes into the water column, where fertilization occurs externally. In the aquarium, breeding is less common but can be encouraged with proper water conditions and by keeping a group of individuals.

Symbiosis

Diadema setosum does not have any specific symbiotic relationships that are of particular interest to the aquarium hobby, but their role in the wild as algae grazers indirectly benefits corals by preventing algal overgrowth.

Habitat

Diadema setosum is found in a variety of marine environments, from shallow seagrass beds to deep reef slopes. They are common in the Indo-Pacific region, often seen nestled in crevices during the day and becoming more active at night.