Arthropods from region Gregory County (South Dakota, USA) Arachnida Lamarck, 1801 Arachnids | 15 18 17 | Families Genera Species | Taxom
| Entognatha Stummer-Traunfels, 1891 Entognathids | 1 3 0 | Families Genera Species | Taxom
| Insecta Linnaeus, 1758 Insects, True insects | 132 443 570 | Families Genera Species | Taxom
| Malacostraca Latreille, 1802 Higher Crustaceans, Malacostracans | 7 7 7 | Families Genera Species | Taxom
| Ostracoda Latreille, 1802 Mussel shrimps, Ostracods, Seed Shrimps | 1 1 0 | Families Genera Species | Taxom
| Trilobita ♰ Walch, 1771 Trilobites | 4 4 1 | Families Genera Species | Taxom
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