Trapezia
Trapezia are a genus of small, colorful crabs that live in symbiosis with corals. They are commonly known as coral-dwelling crabs or coral crabs. Trapezia crabs are found in the Indo-Pacific region and are known for their distinctive bright orange, red, or yellow shells. They are adapted to live within the branches of branching corals, where they find shelter and food.
Common Names
Common names for Trapezia crabs include:
- Coral-dwelling crab
- Coral crab
- Trapezia crab
Characteristics
Trapezia crabs are relatively small, typically reaching a carapace width of 1-2 centimeters. They have a distinctive, somewhat trapezoidal carapace, which gives the genus its name. The carapace is often brightly colored, ranging from orange to red to yellow. The crabs also have long, slender legs, which help them to cling to the coral branches.
Environments
Trapezia crabs are found in the Indo-Pacific region, where they inhabit branching corals, particularly those of the genera Acropora and Pocillopora. They are often found in large numbers on a single coral colony. The crabs exhibit a strong preference for living in the upper branches of corals, where they have access to the most abundant food sources.
Symbiosis
Trapezia crabs are known for their symbiotic relationship with corals. The crabs provide a valuable service to their host corals by removing algae and parasites from the coral surface. In turn, the corals provide the crabs with shelter and food. This symbiotic relationship is mutually beneficial, as both the crabs and the corals benefit from the association.
References
For further information, please see the following references: