Arthropods from region Orne (Lower Normandy, France) Arachnida Lamarck, 1801 Arachnids | 16 24 24 | Families Genera Species | Taxom
| Insecta Linnaeus, 1758 Insects, True insects | 98 296 399 | Families Genera Species | Taxom
| Malacostraca Latreille, 1802 Higher Crustaceans, Malacostracans | 17 20 21 | Families Genera Species | Taxom
| Maxillopoda Dahl, 1956 Maxillopods | 1 1 1 | Families Genera Species | Taxom
| Merostomata Woodward, 1866 Horseshoe crabs, Merostomates | 1 1 1 | Families Genera Species | Taxom
| Ostracoda Latreille, 1802 Mussel shrimps, Ostracods, Seed Shrimps | 9 14 4 | Families Genera Species | Taxom
| Trilobita ♰ Walch, 1771 Trilobites | 14 19 11 | Families Genera Species | Taxom
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