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Class MerostomataDomain Eukarya Kingdom Animalia Sub-kingdom Eumetazoa Sub-sub-kingdom Bilateria Metaphylum Schizocoelos Coelomates Phylum Arthropoda Subphylum Chelicerata Class Merostomata Horseshoe crabs are marine chelicerates which have book gills. Greek: meros, part + stoma, mouth. (Dorit et al, 1991) |