Arthropods from region Southwest USA (West USA, USA) Arachnida Lamarck, 1801 Arachnids | 282 967 2046 | Families Genera Species | Taxom
| Branchiopoda Latreille, 1817 Branchiopods, Brine shrimps, Daphnia, Fairy shrimps and Water fleas, Phyllopods | 16 25 58 | 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 | 11 68 193 | Families Genera Species | Taxom
| Dinocaridida Collins, 1996 Wedgeheads | 1 1 2 | Families Genera Species | Taxom
| Diplopoda De Blainville in Gervais, 1844 Diplopods, Millepedes, Millipede, Millipedes | 39 129 271 | Families Genera Species | Taxom
| Entognatha Stummer-Traunfels, 1891 Entognathids | 24 75 181 | Families Genera Species | Taxom
| Insecta Linnaeus, 1758 Insects, True insects | 681 9912 35623 | Families Genera Species | Taxom
| Malacostraca Latreille, 1802 Higher Crustaceans, Malacostracans | 258 776 1530 | Families Genera Species | Taxom
| Maxillopoda Dahl, 1956 Maxillopods | 124 314 534 | Families Genera Species | Taxom
| Megacheira ♰ Hou & Bergström, 1997 Great appendage arthropods | 1 1 0 | Families Genera Species | Taxom
| Merostomata Woodward, 1866 Horseshoe crabs, Merostomates | 1 2 2 | Families Genera Species | Taxom
| Ostracoda Latreille, 1802 Mussel shrimps, Ostracods, Seed Shrimps | 66 208 224 | Families Genera Species | Taxom
| Pauropoda Lubbock, 1868 Pauropodans, Pauropods, Progoneates | 2 2 3 | Families Genera Species | Taxom
| Pycnogonida Latreille, 1810 Pycnogonids, Sea Spider, Sea Spiders | 10 21 55 | 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 2 4 | Families Genera Species | Taxom
| Trilobita ♰ Walch, 1771 Trilobites | 105 480 597 | Families Genera Species | Taxom
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