Common name: Conical Spider Crab

General information

The Triangle Spider Crab, Xenocarcinus conicus, is a unique and fascinating species known for its triangular carapace and long, slender legs. This species is not commonly found in the aquarium trade but can be an interesting addition for advanced hobbyists looking to diversify their invertebrate collection. They are known for their cryptic behavior and ability to camouflage with their surroundings, often covering themselves with sponges and other sessile invertebrates for protection.

Care

Caring for Triangle Spider Crabs requires a well-established reef aquarium with plenty of live rock and hiding places. They are generally peaceful and can coexist with a variety of tank mates. However, they may prey on small, slow-moving fish or sessile invertebrates, so tank mates should be chosen with care. A varied diet of meaty foods and detritus will help maintain their health.

Reproduction

Little is known about the reproductive habits of Xenocarcinus conicus in the home aquarium. In the wild, they are likely to have a similar reproductive strategy to other spider crabs, with females carrying the fertilized eggs until they hatch into planktonic larvae.

Symbiosis

Triangle Spider Crabs exhibit a form of commensalism by decorating their carapace with materials from their environment, such as sponges, algae, and other invertebrates. This behavior provides them with effective camouflage against predators and may also offer some protection from parasites.

Habitat

Xenocarcinus conicus is typically found in the Indo-Pacific region, from the Red Sea to the Western Pacific. They inhabit coral reefs and are often associated with plate corals where they blend in seamlessly with their surroundings.