fossil marine animal genera Linnaeus, 1758 - animals Phylum Arthropoda Siebold, 1848 - arthropods Class †Merostomoidea Stormer, 1944 1 Order †Emeraldellida Størmer, 1944 2 Order †Limulavida Walcott, 1911 3 Order †Cheloniellida Broili, 1933 4 Order †incertae sedis