Arthropods from region Blair County (Pennsylvania, USA) Arachnida Lamarck, 1801 Arachnids | 32 58 68 | Families Genera Species | Taxom
| Branchiopoda Latreille, 1817 Branchiopods, Brine shrimps, Daphnia, Fairy shrimps and Water fleas, Phyllopods | 2 2 3 | Families Genera Species | Taxom
| Chilopoda Latreille, 1817 Centiped, Centipede, Centipedes, Centipeds, Chilopods | 1 1 1 | Families Genera Species | Taxom
| Diplopoda De Blainville in Gervais, 1844 Diplopods, Millepedes, Millipede, Millipedes | 5 5 5 | Families Genera Species | Taxom
| Entognatha Stummer-Traunfels, 1891 Entognathids | 5 7 4 | Families Genera Species | Taxom
| Insecta Linnaeus, 1758 Insects, True insects | 248 1005 1302 | Families Genera Species | Taxom
| Malacostraca Latreille, 1802 Higher Crustaceans, Malacostracans | 11 15 23 | Families Genera Species | Taxom
| Merostomata Woodward, 1866 Horseshoe crabs, Merostomates | 1 1 0 | Families Genera Species | Taxom
| Ostracoda Latreille, 1802 Mussel shrimps, Ostracods, Seed Shrimps | 15 36 54 | Families Genera Species | Taxom
| Trilobita ♰ Walch, 1771 Trilobites | 24 40 16 | Families Genera Species | Taxom
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