Arthropods from region Will County (Northwestern Illinois, Illinois, USA) Arachnida Lamarck, 1801 Arachnids | 46 112 147 | Families Genera Species | Taxom
| Branchiopoda Latreille, 1817 Branchiopods, Brine shrimps, Daphnia, Fairy shrimps and Water fleas, Phyllopods | 2 2 1 | Families Genera Species | Taxom
| Chilopoda Latreille, 1817 Centiped, Centipede, Centipedes, Centipeds, Chilopods | 4 5 5 | Families Genera Species | Taxom
| Diplopoda De Blainville in Gervais, 1844 Diplopods, Millepedes, Millipede, Millipedes | 10 13 14 | Families Genera Species | Taxom
| Entognatha Stummer-Traunfels, 1891 Entognathids | 13 35 44 | Families Genera Species | Taxom
| Insecta Linnaeus, 1758 Insects, True insects | 284 1440 2170 | Families Genera Species | Taxom
| Malacostraca Latreille, 1802 Higher Crustaceans, Malacostracans | 22 30 43 | Families Genera Species | Taxom
| Maxillopoda Dahl, 1956 Maxillopods | 3 5 4 | Families Genera Species | Taxom
| Ostracoda Latreille, 1802 Mussel shrimps, Ostracods, Seed Shrimps | 6 8 4 | Families Genera Species | Taxom
| Trilobita ♰ Walch, 1771 Trilobites | 15 21 12 | Families Genera Species | Taxom
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