Arthropods from region Southern Illinois (Illinois, USA) Arachnida Lamarck, 1801 Arachnids | 51 127 172 | Families Genera Species | Taxom
| Branchiopoda Latreille, 1817 Branchiopods, Brine shrimps, Daphnia, Fairy shrimps and Water fleas, Phyllopods | 1 1 2 | Families Genera Species | Taxom
| Chilopoda Latreille, 1817 Centiped, Centipede, Centipedes, Centipeds, Chilopods | 3 5 5 | Families Genera Species | Taxom
| Diplopoda De Blainville in Gervais, 1844 Diplopods, Millepedes, Millipede, Millipedes | 11 17 18 | Families Genera Species | Taxom
| Entognatha Stummer-Traunfels, 1891 Entognathids | 11 26 30 | Families Genera Species | Taxom
| Insecta Linnaeus, 1758 Insects, True insects | 338 1795 2678 | Families Genera Species | Taxom
| Malacostraca Latreille, 1802 Higher Crustaceans, Malacostracans | 37 49 73 | Families Genera Species | Taxom
| Maxillopoda Dahl, 1956 Maxillopods | 5 5 5 | Families Genera Species | Taxom
| Merostomata Woodward, 1866 Horseshoe crabs, Merostomates | 2 4 2 | Families Genera Species | Taxom
| Ostracoda Latreille, 1802 Mussel shrimps, Ostracods, Seed Shrimps | 15 22 7 | Families Genera Species | Taxom
| Pycnogonida Latreille, 1810 Pycnogonids, Sea Spider, Sea Spiders | 1 1 1 | Families Genera Species | Taxom
| Trilobita ♰ Walch, 1771 Trilobites | 15 24 9 | Families Genera Species | Taxom
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