The Honeycomb Guard Crab, also known as the Coral Crab, is a fascinating marine crustacean with a unique relationship with coral reefs. Scientifically classified as Trapezia septata, this crab exhibits a distinctive appearance and plays a crucial role in the intricate web of life within its habitat.
Description & Characteristics
Trapezia septata is readily identifiable by its honeycomb-like, textured carapace, which is a defining feature of its common name. Its body is typically a reddish-brown color, with a maximum size reaching approximately 3 cm in length. The crab’s claws are disproportionately large in comparison to its body, a characteristic that is particularly striking. This morphology is indicative of its defensive and predatory behavior.
Habitat and Occurrence
Trapezia septata is a common inhabitant of coral reefs throughout the Indo-Pacific region. These crabs prefer to live in the subtidal, sublittoral, infralittoral, deep zone of the oceans from the lower limit of the intertidal zone (intertidal) to the shelf edge at about 200 m water depth. This encompasses the neritic zone, a marine environment characterized by its proximity to the coastline and relatively shallow depths.
Taxonomy
Trapezia septata belongs to the Class: Malacostraca, Order: Decapoda, and Family: Trapeziidae. This classification places it within the larger group of crustaceans known as decapods, which are characterized by their ten walking legs. The family Trapeziidae encompasses a diverse range of crabs, often distinguished by their associations with coral reefs.
Feeding
The Honeycomb Guard Crab exhibits a unique commensalistic relationship with corals. This means that the crab benefits from the relationship, while the coral is neither negatively nor positively affected. Trapezia septata typically resides amongst the branches of branching corals, where it feeds on zooplankton, small invertebrates, and algae. The crab’s presence provides a form of defense for the coral, as its large claws deter potential predators.
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