Arthropods from region Washington (West USA, USA) Arachnida Lamarck, 1801 Arachnids | 145 414 648 | Families Genera Species | Taxom
| Branchiopoda Latreille, 1817 Branchiopods, Brine shrimps, Daphnia, Fairy shrimps and Water fleas, Phyllopods | 14 23 37 | Families Genera Species | Taxom
| Chilopoda Latreille, 1817 Centiped, Centipede, Centipedes, Centipeds, Chilopods | 7 20 27 | Families Genera Species | Taxom
| Diplopoda De Blainville in Gervais, 1844 Diplopods, Millepedes, Millipede, Millipedes | 24 53 59 | Families Genera Species | Taxom
| Entognatha Stummer-Traunfels, 1891 Entognathids | 14 52 98 | Families Genera Species | Taxom
| Insecta Linnaeus, 1758 Insects, True insects | 560 5614 14483 | Families Genera Species | Taxom
| Malacostraca Latreille, 1802 Higher Crustaceans, Malacostracans | 177 493 1012 | Families Genera Species | Taxom
| Maxillopoda Dahl, 1956 Maxillopods | 97 198 308 | Families Genera Species | Taxom
| Ostracoda Latreille, 1802 Mussel shrimps, Ostracods, Seed Shrimps | 49 118 108 | Families Genera Species | Taxom
| Pycnogonida Latreille, 1810 Pycnogonids, Sea Spider, Sea Spiders | 5 12 35 | Families Genera Species | Taxom
| Trilobita ♰ Walch, 1771 Trilobites | 30 48 36 | Families Genera Species | Taxom
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