Arthropods from region Placer County (Eastern California, California, USA) Arachnida Lamarck, 1801 Arachnids | 38 56 60 | Families Genera Species | Taxom
| Branchiopoda Latreille, 1817 Branchiopods, Brine shrimps, Daphnia, Fairy shrimps and Water fleas, Phyllopods | 5 6 7 | Families Genera Species | Taxom
| Diplopoda De Blainville in Gervais, 1844 Diplopods, Millepedes, Millipede, Millipedes | 5 5 5 | Families Genera Species | Taxom
| Entognatha Stummer-Traunfels, 1891 Entognathids | 10 21 18 | Families Genera Species | Taxom
| Insecta Linnaeus, 1758 Insects, True insects | 257 1157 1795 | Families Genera Species | Taxom
| Malacostraca Latreille, 1802 Higher Crustaceans, Malacostracans | 35 43 41 | Families Genera Species | Taxom
| Maxillopoda Dahl, 1956 Maxillopods | 6 9 10 | Families Genera Species | Taxom
| Pycnogonida Latreille, 1810 Pycnogonids, Sea Spider, Sea Spiders | 1 1 0 | Families Genera Species | Taxom
| Trilobita ♰ Walch, 1771 Trilobites | 14 24 12 | Families Genera Species | Taxom
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