Common name: sea cucumber crab

General information

The Orbicular Velvet Crab, Lissocarcinus orbicularis, is a species of swimming crab that is often appreciated in the reef aquarium hobby for its unique appearance and behavior. This crab is known for its round, flattened carapace and the velvety texture of its exoskeleton, which is where it gets its common name. The coloration of this species can vary but is typically a mottled brown, helping it blend into its surroundings.

Care

Lissocarcinus orbicularis is a hardy species that can adapt to life in captivity if provided with the right conditions. They require a tank with plenty of live rock and a sandy substrate where they can forage for food. These crabs are scavengers by nature and will help keep the tank clean by consuming detritus, uneaten food, and possibly some types of nuisance algae. However, they should also be offered a varied diet that includes meaty foods and high-quality marine pellets.

Reproduction

In the wild, Lissocarcinus orbicularis breeds during specific seasons, with females carrying the fertilized eggs under their abdomen until they hatch. In captivity, breeding is less common, but with optimal conditions, it is possible to observe larval stages in the aquarium.

Symbiosis

While not known for any specific symbiotic relationships like those seen in clownfish and anemones, the Orbicular Velvet Crab may engage in commensal relationships with other reef inhabitants, taking advantage of the shelter and food sources provided by larger animals or structures within the reef.

Habitat

The natural habitat of Lissocarcinus orbicularis includes coral reefs and mangrove areas in the Indo-Pacific region. They are often found in shallow waters, hiding under rocks or within the reef structure during the day and becoming more active at night.