Arthropods from region Ordovician (Paleozoic) Arachnida Lamarck, 1801 Arachnids | 1 1 1 | Families Genera Species | Taxom
| Artiopoda ♰ Hou & Bergström, 1997 Artiopods | 1 4 3 | Families Genera Species | Taxom
| Diplopoda De Blainville in Gervais, 1844 Diplopods, Millepedes, Millipede, Millipedes | 1 1 1 | Families Genera Species | Taxom
| Insecta Linnaeus, 1758 Insects, True insects | 39 58 51 | Families Genera Species | Taxom
| Malacostraca Latreille, 1802 Higher Crustaceans, Malacostracans | 6 7 8 | Families Genera Species | Taxom
| Marrellomorpha ♰ Beurlen, 1930 Marrellomorph Arthropods | 1 2 4 | Families Genera Species | Taxom
| Merostomata Woodward, 1866 Horseshoe crabs, Merostomates | 4 9 2 | Families Genera Species | Taxom
| Ostracoda Latreille, 1802 Mussel shrimps, Ostracods, Seed Shrimps | 51 208 491 | Families Genera Species | Taxom
| Pycnogonida Latreille, 1810 Pycnogonids, Sea Spider, Sea Spiders | 0 1 1 | Families Genera Species | Taxom
| Thylacocephala ♰ Pinna & al., 1982 Bivalve arthropods | 0 1 0 | Families Genera Species | Taxom
| Trilobita ♰ Walch, 1771 Trilobites | 90 824 1708 | Families Genera Species | Taxom
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