Phylogeny and systematics of the Trapeziidae Miers, 1886 (Crustacea: Brachyura), with the description of a new family Author PETER CASTRO Author PETER K. L. NG Author SHANE T. AHYONG text Zootaxa 2004 643 1 70 journal article 38783 10.5281/zenodo.158851 83523ad5-7f0f-489d-8531-3b20edd51abc 1-877354-55-4 158851 7EBFF1EF-09C7-4A60-890E-26747C8FBF46 Key to extant genera of Domeciidae 1 ­ 2 ­ 3 ­ Frontal and anterolateral margins of carapace with numerous acute teeth (Plate 1A). Merus of third maxillipeds about twice as broad. Facultative symbionts of shallowwater scleractinian corals ................................................................................. Domecia Anterolateral margins of carapace between outer orbital angle and anterolateral teeth each with 2 teeth or small tubercles; frontal margin smooth or with microscopic denticles or tubercles, margin complete and nearly straight or with shallow median indentation. Merus of third maxillipeds as long as broad. Obligate symbionts of scleractinian and hydrozoan corals and gorgonians ......................................................................... 2 Chelipeds conspicuously unequal ............................................................................... 3 Chelipeds equal (see Borradaile 1902 : fig. 60) ... Maldivia (monotypic, M. symbiotica ) Rounded tubercles on propodus of chelipeds (Plate 1B) ............................................... ....................................................................... Jonesius (monotypic, J. triunguiculatus ) Pointed tubercles on propodus of chelipeds (Plate 1C)................................................... ........................................................................... Palmyria (monotypic, M. palmyrensis )