The Red-Spotted Guard Crab, Tiger Coral Crab (Trapezia tigrina) is a species of crab known for its striking coloration and symbiotic relationship with corals. It is a common sight on coral reefs throughout its range, playing a crucial role in maintaining the health of these vital ecosystems.
Description & Characteristics
Trapezia tigrina is a relatively small crab, reaching a maximum carapace width of approximately 2.5 cm. Its carapace is typically a deep reddish-brown color, adorned with numerous bright red spots, giving it its common name. The crab’s legs are also red, with black tips, further emphasizing its distinctive appearance.
Habitat and Occurrence
The Red-Spotted Guard Crab, Tiger Coral Crab (Trapezia tigrina) is a highly specialized inhabitant of coral reefs. It is typically found living in association with branching corals, particularly the genus Acropora. The crab’s preference for these corals is likely due to the numerous crevices and cavities they provide, offering protection from predators. Trapezia tigrina can be found in both shallow and deeper water, with a depth range of 1 to 20 meters, making it a common sight in the intertidal and subtidal zones of coral reefs.
Taxonomy
The species Trapezia tigrina belongs to the Class Malacostraca, Order Decapoda, and Family Trapeziidae. This family of crabs is characterized by their flattened, often brightly colored carapaces and their close association with corals.
Feeding
Trapezia tigrina is an omnivorous crab that primarily feeds on detritus, algae, and small invertebrates. It plays a significant role in the coral reef ecosystem by consuming detritus and helping to keep the coral clean. The crab’s feeding habits make it a key contributor to nutrient cycling within the reef environment.
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