Trapezia is a genus of guard crabs in the family Trapeziidae. Like other members of this family, they live in association with corals, feeding on coral tissue and mucus, and defending the corals from predators, like starfish.

Allometric Growth of the Carapace in Trapezia (Brachyura, Xanthidae)
Trapezia and Tetralia (Decapoda, Brachyura, Xanthidae) as Obligate Ectoparasites of Pocilloporid and Acroporid Corals
Population genetics of eight species of Trapezia (Brachyura: Xanthidae), symbionts of corals
Eastern Pacific Species of Trapezia (Crustacea, Brachyura: Trapeziidae), Sibling Species Symbiotic with Reef Corals
Effects of coral bleaching on the obligate coral-dwelling crab Trapezia cymodoce
Movements between coral colonies in Trapezia ferruginea (Crustacea: Brachyura), an obligate symbiont of scleractinian corals
Functional capabilities of modern and fossil hominid hands: Three‐dimensional analysis of trapezia
Allometric Variation and Sexual Maturity in the Obligate Coral Commensal Trapezia ferruginea Latreille (Decapoda, Xanthidae)
Palaeoclimatic implications of the occurrence of the arcoid bivalve Anadara trapezia (Deshayes) in the Quaternary of Australasia
The accumulation of Zn, Se, Cd, and Pb and physiological condition of Anadara trapezia transplanted to a contamination gradient in L...