Arthropods from region West USA (USA) Arachnida Lamarck, 1801 Arachnids | 358 1430 3936 | Families Genera Species | Taxom
| Artiopoda ♰ Hou & Bergström, 1997 Artiopods | 3 4 2 | Families Genera Species | Taxom
| Branchiopoda Latreille, 1817 Branchiopods, Brine shrimps, Daphnia, Fairy shrimps and Water fleas, Phyllopods | 25 49 117 | Families Genera Species | Taxom
| Cephalocarida Sanders, 1955 Cephalocarids, Horseshoe shrimps | 1 1 1 | Families Genera Species | Taxom
| Chilopoda Latreille, 1817 Centiped, Centipede, Centipedes, Centipeds, Chilopods | 13 113 401 | Families Genera Species | Taxom
| Dinocaridida Collins, 1996 Wedgeheads | 2 4 7 | Families Genera Species | Taxom
| Diplopoda De Blainville in Gervais, 1844 Diplopods, Millepedes, Millipede, Millipedes | 49 201 428 | Families Genera Species | Taxom
| Entognatha Stummer-Traunfels, 1891 Entognathids | 27 160 533 | Families Genera Species | Taxom
| Insecta Linnaeus, 1758 Insects, True insects | 782 15067 62702 | Families Genera Species | Taxom
| Malacostraca Latreille, 1802 Higher Crustaceans, Malacostracans | 298 1033 2580 | Families Genera Species | Taxom
| Maxillopoda Dahl, 1956 Maxillopods | 147 441 946 | Families Genera Species | Taxom
| Megacheira ♰ Hou & Bergström, 1997 Great appendage arthropods | 2 3 3 | Families Genera Species | Taxom
| Merostomata Woodward, 1866 Horseshoe crabs, Merostomates | 8 11 11 | Families Genera Species | Taxom
| Ostracoda Latreille, 1802 Mussel shrimps, Ostracods, Seed Shrimps | 93 378 516 | Families Genera Species | Taxom
| Pauropoda Lubbock, 1868 Pauropodans, Pauropods, Progoneates | 2 5 5 | Families Genera Species | Taxom
| Pycnogonida Latreille, 1810 Pycnogonids, Sea Spider, Sea Spiders | 11 26 102 | Families Genera Species | Taxom
| Remipedia Yager, 1981 Cave-dwelling crustaceans, Remipedes | 1 1 1 | Families Genera Species | Taxom
| Symphyla Ryder, 1880 Dwarf Centipedes, Pseudocentipedes, Symphylans, Symphylids | 2 8 14 | Families Genera Species | Taxom
| Thylacocephala ♰ Pinna & al., 1982 Bivalve arthropods | 1 4 7 | Families Genera Species | Taxom
| Trilobita ♰ Walch, 1771 Trilobites | 131 761 1351 | Families Genera Species | Taxom
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