fossil marine animal genera Linnaeus, 1758 - animals
   Phylum Arthropoda Siebold, 1848 - arthropods
     01 Class Merostomata Dana, 1852 - horseshoe crabs see Class Xiphosura Latreille, 1802
     02 Class Arachnida Lamarck, 1801
     03 Class Pycnogonida Latreille, 1810 - pycnogonids
     04 Class †"Paratrilobita"
     05 Class †Merostomoidea Stormer, 1944
     06 Class †Marrelomorpha Beurlen, 1934 see Class Marrellomorpha Beurlen, 1934
     07 Class Myriapoda Latreille, 1802 see Subphylum Myriapoda Latreille, 1802
     08 Class †uncertain
     09 Class †Trilobita Walch, 1771 - trilobites
     10 Class †Thylacocephala Pinna et al., 1982
     11 Crustacea Brünnich, 1772 see [unranked] Crustaceomorpha Chernyshev, 1960