Arthropods from region California (West USA, USA) Arachnida Lamarck, 1801 Arachnids | 280 876 1740 | Families Genera Species | Taxom
| Branchiopoda Latreille, 1817 Branchiopods, Brine shrimps, Daphnia, Fairy shrimps and Water fleas, Phyllopods | 16 23 54 | 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 67 184 | Families Genera Species | Taxom
| Dinocaridida Collins, 1996 Wedgeheads | 1 1 0 | Families Genera Species | Taxom
| Diplopoda De Blainville in Gervais, 1844 Diplopods, Millepedes, Millipede, Millipedes | 39 119 255 | Families Genera Species | Taxom
| Entognatha Stummer-Traunfels, 1891 Entognathids | 24 72 169 | Families Genera Species | Taxom
| Insecta Linnaeus, 1758 Insects, True insects | 677 9087 31848 | Families Genera Species | Taxom
| Malacostraca Latreille, 1802 Higher Crustaceans, Malacostracans | 255 733 1399 | Families Genera Species | Taxom
| Maxillopoda Dahl, 1956 Maxillopods | 124 311 525 | 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 | 36 115 156 | 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 20 53 | 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
| Trilobita ♰ Walch, 1771 Trilobites | 63 161 99 | Families Genera Species | Taxom
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