Arthropods from region Oeste (Região Centro, Portugal) Arachnida Lamarck, 1801 Arachnids | 5 7 5 | Families Genera Species | Taxom
| Insecta Linnaeus, 1758 Insects, True insects | 49 98 83 | Families Genera Species | Taxom
| Malacostraca Latreille, 1802 Higher Crustaceans, Malacostracans | 3 3 2 | Families Genera Species | Taxom
| Maxillopoda Dahl, 1956 Maxillopods | 7 9 8 | Families Genera Species | Taxom
| Ostracoda Latreille, 1802 Mussel shrimps, Ostracods, Seed Shrimps | 7 11 5 | Families Genera Species | Taxom
| Pycnogonida Latreille, 1810 Pycnogonids, Sea Spider, Sea Spiders | 4 6 8 | Families Genera Species | Taxom
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