Common name: Regal Slipper lobster

General information

The Royal Urchin, Arctides regalis, is a striking marine invertebrate known for its long, regal spines that can span up to 30 centimeters. These spines are typically banded with contrasting colors, which can range from deep purples and blues to vibrant reds and oranges, making them a visually captivating addition to any reef aquarium. Native to the Indo-Pacific region, they are nocturnal creatures that tend to hide during the day and become more active at night.

Care

Royal Urchins require a well-established aquarium with plenty of live rock and a stable environment. They are sensitive to water quality and require consistent parameters, with particular attention to calcium levels, which are crucial for spine development. They are generally peaceful and can coexist with a variety of tank mates, but their long spines can inadvertently damage corals or other sessile invertebrates if not given enough space to move around.

Reproduction

In the wild, Arctides regalis reproduces by releasing gametes into the water column, a process known as broadcast spawning. In the home aquarium, breeding is rare, but hobbyists can encourage spawning by maintaining excellent water quality and mimicking natural seasonal changes in lighting and temperature.

Symbiosis

While not known for any specific symbiotic relationships, Royal Urchins play a crucial role in the ecosystem by consuming algae, which helps maintain a clean and balanced aquarium environment.

Habitat

The Royal Urchin is found in the tropical waters of the Indo-Pacific, from the Red Sea to the Central Pacific. They typically inhabit reef slopes and lagoons, often seeking refuge in crevices during the day. In the aquarium, they require ample hiding places and room to roam without disturbing other inhabitants.