Splendid Pebble Crab

Overview

The Splendid Pebble Crab (Etisus splendidus) is a large, striking crustacean widely distributed across the Indo-Pacific region. Primarily nocturnal, this species is frequently observed on coral reefs, where it remains exposed on lagoon, pinnacle, and seaward reef structures after dark.

Appearance

This crab is characterized by a broad, oval-shaped carapace that is typically bright red to brick-red or brownish-red in color. The surface of the carapace is smooth with distinct bumps, and its edges are lined with prominent, hook-like spines. It features a pair of robust, spiny chelipeds (claws) that often have spoon-shaped tips, as well as four pairs of hairy walking legs. Adults can reach significant sizes, with a carapace width often exceeding 15 cm.

Biology & behavior

Active mainly at night, the Splendid Pebble Crab is often found resting in open areas of the reef, where it may remain stationary when illuminated by dive lights. It is an omnivorous scavenger that feeds on a variety of items, including algae, carrion, snails, clams, and worms. Like many members of the Xanthidae family, this species is known to be toxic if consumed; it should never be eaten, as its toxins are heat-stable and potentially dangerous to humans.