Arthropods from region Marshall County (Iowa, USA) Arachnida Lamarck, 1801 Arachnids | 17 29 32 | Families Genera Species | Taxom
| Chilopoda Latreille, 1817 Centiped, Centipede, Centipedes, Centipeds, Chilopods | 1 1 1 | Families Genera Species | Taxom
| Diplopoda De Blainville in Gervais, 1844 Diplopods, Millepedes, Millipede, Millipedes | 3 3 3 | Families Genera Species | Taxom
| Entognatha Stummer-Traunfels, 1891 Entognathids | 8 19 8 | Families Genera Species | Taxom
| Insecta Linnaeus, 1758 Insects, True insects | 193 727 977 | Families Genera Species | Taxom
| Malacostraca Latreille, 1802 Higher Crustaceans, Malacostracans | 15 17 19 | Families Genera Species | Taxom
| Maxillopoda Dahl, 1956 Maxillopods | 4 5 5 | Families Genera Species | Taxom
| Merostomata Woodward, 1866 Horseshoe crabs, Merostomates | 1 1 1 | Families Genera Species | Taxom
| Ostracoda Latreille, 1802 Mussel shrimps, Ostracods, Seed Shrimps | 2 3 1 | Families Genera Species | Taxom
| Thylacocephala ♰ Pinna & al., 1982 Bivalve arthropods | 1 1 0 | Families Genera Species | Taxom
| Trilobita ♰ Walch, 1771 Trilobites | 8 9 3 | Families Genera Species | Taxom
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