Common name: Corallimorph Decorator Crab

General information

The Mithrax Crab, commonly known as the Emerald Crab, is a small and popular marine invertebrate in the reefkeeping hobby. Its scientific name is Cyclocoeloma tuberculata, and it is prized for its algae-eating habits. The Emerald Crab is known for its distinctive green coloration and its ability to consume various types of algae, including bubble algae which can be problematic in reef aquariums.

Care

Emerald Crabs are relatively easy to care for, requiring stable marine conditions with adequate hiding places. They are nocturnal and do most of their feeding at night. While they primarily consume algae, they may also accept meaty foods. It's important to ensure they have enough natural food sources in the aquarium, or supplement their diet to prevent them from preying on small fish or other invertebrates.

Reproduction

In captivity, Emerald Crabs can reproduce if conditions are right, with females carrying eggs beneath their abdomen until they hatch. The larvae are planktonic and require specialized care to survive, which can be challenging for the hobbyist.

Symbiosis

While not known for any specific symbiotic relationships, Emerald Crabs can coexist peacefully with a variety of tank mates, provided they are not overly aggressive or large enough to prey on the crabs.

Habitat

Emerald Crabs are found in the Caribbean Sea and along the Gulf of Mexico. They typically inhabit rocky areas and coral reefs where they can find ample algae to feed on and crevices for shelter.