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Family Trapeziidae (Coral Crabs)

Introduction

The Trapeziidae are a group of small colourful crabs which live symbiotically on cnidarians. Trapezia are obligate symbionts on branching corals, particularly Pocillopora, Seriatopora and Stylophora, whereas Quadrella prefer soft corals, sea fans and black corals. Coral crabs live in a mutualistic relationship with their host and provide defence against predators while obtaining nutrition from the host's mucous.  —  John W. Short, 2026

Diagnosis

Carapace trapezoidal, hexagonal, octagonal or transversely ovate; regions poorly defined; front not conspicuously longer than posterior margin, anterolateral margins unarmed or with single tooth. Chelipeds subequal or slightly unequal; merus long, extending past edge of carapace by more than one third length; propodus smooth; fingertips acute. Male abdomen with segments 3–5 fused. Genital openings coxal on males, sternal on females.  —  John W. Short, 2026

Trapezia cymodoce (Herbst, 1801) ‒ Blue Coral Crab
Trapezia cymodoce (Herbst, 1801) ‒ Blue Coral Crab
Trapezia cymodoce (Herbst, 1801) – open-access species data including web-resolution colour photograph. A high-resolution version of the same colour photograph is offered for purchase and download.Description A wide-ranging Indo-Pacific species found on subtidal coral reefs.Taxonomy Kin..
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Trapezia guttata Rüppell, 1830 ‒ Bird's Nest Coral Crab
Trapezia guttata Rüppell, 1830 ‒ Bird's Nest Coral Crab
Trapezia guttata Rüppell, 1830 – open-access species data including web-resolution colour photograph. A high-resolution version of the same colour photograph is offered for purchase and download.Description A wide-ranging Indo-West Pacific species found on intertidal and subtidal coral reefs..
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Trapezia septata Dana, 1852 ‒ Honeycomb Coral Crab
Trapezia septata Dana, 1852 ‒ Honeycomb Coral Crab
Trapezia septata Dana, 1852 – open-access species data including web-resolution colour photograph.Description A wide-ranging Indo-West Pacific species found on subtidal coral reefs. Symbiotic on branching corals, particularly species of Pocillopora, Seriatopora and Stylophora.Taxonomy K..
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Trapezia serenei Odinetz, 1984 ‒ Serene's Coral Crab
Trapezia serenei Odinetz, 1984 ‒ Serene's Coral Crab
Trapezia serenei Odinetz, 1984 – open-access species data including web-resolution colour photograph. A high-resolution version of the same colour photograph is offered for purchase and download.Description A wide-ranging Indo-West Pacific species found on subtidal coral reefs. Symbiotic on ..
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