Arthropods from region Mahaska County (Iowa, USA) Arachnida Lamarck, 1801 Arachnids | 28 62 82 | 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 | 7 7 7 | Families Genera Species | Taxom
| Entognatha Stummer-Traunfels, 1891 Entognathids | 7 16 6 | Families Genera Species | Taxom
| Insecta Linnaeus, 1758 Insects, True insects | 250 1044 1461 | Families Genera Species | Taxom
| Malacostraca Latreille, 1802 Higher Crustaceans, Malacostracans | 16 19 25 | Families Genera Species | Taxom
| Maxillopoda Dahl, 1956 Maxillopods | 4 4 4 | Families Genera Species | Taxom
| Ostracoda Latreille, 1802 Mussel shrimps, Ostracods, Seed Shrimps | 5 8 2 | Families Genera Species | Taxom
| Thylacocephala ♰ Pinna & al., 1982 Bivalve arthropods | 1 1 0 | Families Genera Species | Taxom
| Trilobita ♰ Walch, 1771 Trilobites | 5 7 4 | Families Genera Species | Taxom
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