Common name: Red box sea cucumber

General information

The Longspine Urchin, Cercodemas anceps, is a striking invertebrate known for its long, thin spines that can reach up to 30 centimeters in length. These spines are typically banded with contrasting colors, which can vary from black and white to red and white, making them a visually appealing addition to the reef aquarium. They belong to the phylum Echinodermata, which includes other sea urchins, sea stars, and sea cucumbers.

Care

Longspine Urchins require a tank with plenty of live rock and a stable environment to thrive. They are excellent algae grazers and can help control algae growth in the aquarium. However, their long spines can be fragile, so care should be taken to avoid rough handling. They are sensitive to water quality and require consistent levels of calcium to maintain their spines and overall health.

Reproduction

In the wild, Longspine Urchins reproduce by releasing gametes into the water column, where fertilization occurs externally. In the aquarium, breeding Longspine Urchins is quite challenging and rarely occurs. Hobbyists interested in their propagation should focus on maintaining optimal water conditions to support their health and longevity.

Symbiosis

While not known for any specific symbiotic relationships in the aquarium setting, Longspine Urchins in the wild sometimes provide a habitat for small fish and invertebrates that seek refuge among their spines. This form of commensalism offers protection to these smaller creatures from predators.

Habitat

Cercodemas anceps is found in the Indo-Pacific region, from the Red Sea to the Western Pacific. They inhabit coral reefs and rocky substrates, often at depths ranging from shallow waters to about 100 meters. In the aquarium, they require a setup that mimics their natural habitat with ample hiding places and a strong biological filtration system.