Arthropods from region Østfold (Viken, Norway) Arachnida Lamarck, 1801 Arachnids | 91 271 413 | Families Genera Species | Taxom
| Branchiopoda Latreille, 1817 Branchiopods, Brine shrimps, Daphnia, Fairy shrimps and Water fleas, Phyllopods | 12 41 73 | Families Genera Species | Taxom
| Chilopoda Latreille, 1817 Centiped, Centipede, Centipedes, Centipeds, Chilopods | 4 6 18 | Families Genera Species | Taxom
| Diplopoda De Blainville in Gervais, 1844 Diplopods, Millepedes, Millipede, Millipedes | 11 30 35 | Families Genera Species | Taxom
| Entognatha Stummer-Traunfels, 1891 Entognathids | 15 57 134 | Families Genera Species | Taxom
| Insecta Linnaeus, 1758 Insects, True insects | 397 3378 7599 | Families Genera Species | Taxom
| Malacostraca Latreille, 1802 Higher Crustaceans, Malacostracans | 94 149 170 | Families Genera Species | Taxom
| Maxillopoda Dahl, 1956 Maxillopods | 19 37 64 | Families Genera Species | Taxom
| Ostracoda Latreille, 1802 Mussel shrimps, Ostracods, Seed Shrimps | 9 12 12 | Families Genera Species | Taxom
| Pycnogonida Latreille, 1810 Pycnogonids, Sea Spider, Sea Spiders | 4 4 7 | Families Genera Species | Taxom
| Symphyla Ryder, 1880 Dwarf Centipedes, Pseudocentipedes, Symphylans, Symphylids | 2 2 2 | Families Genera Species | Taxom
| Trilobita ♰ Walch, 1771 Trilobites | 1 1 0 | Families Genera Species | Taxom
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