Arthropods from region Pennsylvania (USA) Arachnida Lamarck, 1801 Arachnids | 126 337 484 | Families Genera Species | Taxom
| Artiopoda ♰ Hou & Bergström, 1997 Artiopods | 1 1 0 | Families Genera Species | Taxom
| Branchiopoda Latreille, 1817 Branchiopods, Brine shrimps, Daphnia, Fairy shrimps and Water fleas, Phyllopods | 11 15 23 | Families Genera Species | Taxom
| Chilopoda Latreille, 1817 Centiped, Centipede, Centipedes, Centipeds, Chilopods | 8 15 21 | Families Genera Species | Taxom
| Dinocaridida Collins, 1996 Wedgeheads | 1 1 2 | Families Genera Species | Taxom
| Diplopoda De Blainville in Gervais, 1844 Diplopods, Millepedes, Millipede, Millipedes | 20 37 43 | Families Genera Species | Taxom
| Entognatha Stummer-Traunfels, 1891 Entognathids | 17 44 60 | Families Genera Species | Taxom
| Insecta Linnaeus, 1758 Insects, True insects | 554 5452 12530 | Families Genera Species | Taxom
| Malacostraca Latreille, 1802 Higher Crustaceans, Malacostracans | 49 74 134 | Families Genera Species | Taxom
| Maxillopoda Dahl, 1956 Maxillopods | 11 31 17 | Families Genera Species | Taxom
| Megacheira ♰ Hou & Bergström, 1997 Great appendage arthropods | 1 1 0 | Families Genera Species | Taxom
| Merostomata Woodward, 1866 Horseshoe crabs, Merostomates | 12 21 20 | Families Genera Species | Taxom
| Ostracoda Latreille, 1802 Mussel shrimps, Ostracods, Seed Shrimps | 35 83 168 | Families Genera Species | Taxom
| Pauropoda Lubbock, 1868 Pauropodans, Pauropods, Progoneates | 1 1 1 | Families Genera Species | Taxom
| Thylacocephala ♰ Pinna & al., 1982 Bivalve arthropods | 1 2 3 | Families Genera Species | Taxom
| Trilobita ♰ Walch, 1771 Trilobites | 59 144 161 | Families Genera Species | Taxom
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