Arthropods from region Massachusetts (USA) Arachnida Lamarck, 1801 Arachnids | 102 341 648 | Families Genera Species | Taxom
| Branchiopoda Latreille, 1817 Branchiopods, Brine shrimps, Daphnia, Fairy shrimps and Water fleas, Phyllopods | 13 29 43 | Families Genera Species | Taxom
| Cephalocarida Sanders, 1955 Cephalocarids, Horseshoe shrimps | 1 1 1 | Families Genera Species | Taxom
| Chilopoda Latreille, 1817 Centiped, Centipede, Centipedes, Centipeds, Chilopods | 9 18 26 | Families Genera Species | Taxom
| Diplopoda De Blainville in Gervais, 1844 Diplopods, Millepedes, Millipede, Millipedes | 21 36 44 | Families Genera Species | Taxom
| Entognatha Stummer-Traunfels, 1891 Entognathids | 15 52 103 | Families Genera Species | Taxom
| Insecta Linnaeus, 1758 Insects, True insects | 495 4359 9654 | Families Genera Species | Taxom
| Malacostraca Latreille, 1802 Higher Crustaceans, Malacostracans | 184 460 709 | Families Genera Species | Taxom
| Maxillopoda Dahl, 1956 Maxillopods | 105 244 425 | Families Genera Species | Taxom
| Merostomata Woodward, 1866 Horseshoe crabs, Merostomates | 2 2 1 | Families Genera Species | Taxom
| Ostracoda Latreille, 1802 Mussel shrimps, Ostracods, Seed Shrimps | 24 64 52 | Families Genera Species | Taxom
| Pauropoda Lubbock, 1868 Pauropodans, Pauropods, Progoneates | 1 1 1 | Families Genera Species | Taxom
| Pycnogonida Latreille, 1810 Pycnogonids, Sea Spider, Sea Spiders | 10 14 29 | Families Genera Species | Taxom
| Symphyla Ryder, 1880 Dwarf Centipedes, Pseudocentipedes, Symphylans, Symphylids | 2 2 1 | Families Genera Species | Taxom
| Trilobita ♰ Walch, 1771 Trilobites | 55 162 48 | Families Genera Species | Taxom
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