Key to extant genera of Domeciidae

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­ 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)