[Phylum] [Arthropoda] Siebold, 1848 - arthropods Chelicerata Heymons, 1901 1 ?Genus †Habelia Walcott, 1912 2 ?Genus †Mollisonia Walcott, 1912 3 Genus †Sanctacaris Briggs & Collins, 1988 4 Euchelicerata Weygoldt & Paulus, 1979