Arthropods from region Wales (Great Britain, United Kingdom) Arachnida Lamarck, 1801 Arachnids | 122 425 836 | Families Genera Species | Taxom
| Branchiopoda Latreille, 1817 Branchiopods, Brine shrimps, Daphnia, Fairy shrimps and Water fleas, Phyllopods | 15 46 76 | Families Genera Species | Taxom
| Chilopoda Latreille, 1817 Centiped, Centipede, Centipedes, Centipeds, Chilopods | 7 10 36 | Families Genera Species | Taxom
| Diplopoda De Blainville in Gervais, 1844 Diplopods, Millepedes, Millipede, Millipedes | 20 49 60 | Families Genera Species | Taxom
| Entognatha Stummer-Traunfels, 1891 Entognathids | 16 70 162 | Families Genera Species | Taxom
| Insecta Linnaeus, 1758 Insects, True insects | 515 4876 13111 | Families Genera Species | Taxom
| Malacostraca Latreille, 1802 Higher Crustaceans, Malacostracans | 170 386 662 | Families Genera Species | Taxom
| Marrellomorpha ♰ Beurlen, 1930 Marrellomorph Arthropods | 0 1 1 | Families Genera Species | Taxom
| Maxillopoda Dahl, 1956 Maxillopods | 87 196 288 | Families Genera Species | Taxom
| Merostomata Woodward, 1866 Horseshoe crabs, Merostomates | 2 2 8 | Families Genera Species | Taxom
| Ostracoda Latreille, 1802 Mussel shrimps, Ostracods, Seed Shrimps | 39 119 132 | Families Genera Species | Taxom
| Pycnogonida Latreille, 1810 Pycnogonids, Sea Spider, Sea Spiders | 7 9 24 | Families Genera Species | Taxom
| Symphyla Ryder, 1880 Dwarf Centipedes, Pseudocentipedes, Symphylans, Symphylids | 1 1 1 | Families Genera Species | Taxom
| Trilobita ♰ Walch, 1771 Trilobites | 57 183 76 | Families Genera Species | Taxom
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