Arthropods from region Wellington Formation (Kansas, USA) Arachnida Lamarck, 1801 Arachnids | 21 27 28 | Families Genera Species | Taxom
| Chilopoda Latreille, 1817 Centiped, Centipede, Centipedes, Centipeds, Chilopods | 4 4 6 | Families Genera Species | Taxom
| Insecta Linnaeus, 1758 Insects, True insects | 123 256 470 | Families Genera Species | Taxom
| Malacostraca Latreille, 1802 Higher Crustaceans, Malacostracans | 7 7 7 | Families Genera Species | Taxom
| Maxillopoda Dahl, 1956 Maxillopods | 4 4 4 | Families Genera Species | Taxom
| Merostomata Woodward, 1866 Horseshoe crabs, Merostomates | 2 2 3 | Families Genera Species | Taxom
| Ostracoda Latreille, 1802 Mussel shrimps, Ostracods, Seed Shrimps | 1 2 2 | Families Genera Species | Taxom
|
|