Arthropods from region Roberts County (South Dakota, USA) Arachnida Lamarck, 1801 Arachnids | 14 23 25 | Families Genera Species | Taxom
| Diplopoda De Blainville in Gervais, 1844 Diplopods, Millepedes, Millipede, Millipedes | 1 1 1 | Families Genera Species | Taxom
| Entognatha Stummer-Traunfels, 1891 Entognathids | 2 3 2 | Families Genera Species | Taxom
| Insecta Linnaeus, 1758 Insects, True insects | 148 527 702 | Families Genera Species | Taxom
| Malacostraca Latreille, 1802 Higher Crustaceans, Malacostracans | 10 11 11 | Families Genera Species | Taxom
| Trilobita ♰ Walch, 1771 Trilobites | 11 11 10 | Families Genera Species | Taxom
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