Arthropods from region Montana (West USA, USA) Arachnida Lamarck, 1801 Arachnids | 104 257 493 | Families Genera Species | Taxom
| Branchiopoda Latreille, 1817 Branchiopods, Brine shrimps, Daphnia, Fairy shrimps and Water fleas, Phyllopods | 12 18 28 | Families Genera Species | Taxom
| Chilopoda Latreille, 1817 Centiped, Centipede, Centipedes, Centipeds, Chilopods | 6 10 15 | Families Genera Species | Taxom
| Diplopoda De Blainville in Gervais, 1844 Diplopods, Millepedes, Millipede, Millipedes | 11 20 20 | Families Genera Species | Taxom
| Entognatha Stummer-Traunfels, 1891 Entognathids | 10 20 15 | Families Genera Species | Taxom
| Insecta Linnaeus, 1758 Insects, True insects | 432 3116 6987 | Families Genera Species | Taxom
| Malacostraca Latreille, 1802 Higher Crustaceans, Malacostracans | 59 71 87 | Families Genera Species | Taxom
| Maxillopoda Dahl, 1956 Maxillopods | 7 13 14 | Families Genera Species | Taxom
| Merostomata Woodward, 1866 Horseshoe crabs, Merostomates | 2 2 2 | Families Genera Species | Taxom
| Ostracoda Latreille, 1802 Mussel shrimps, Ostracods, Seed Shrimps | 25 32 25 | Families Genera Species | Taxom
| Trilobita ♰ Walch, 1771 Trilobites | 56 170 223 | Families Genera Species | Taxom
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