Arthropods from region Southwestern Ontario (Southern Ontario, Ontario, Canada) Arachnida Lamarck, 1801 Arachnids | 125 344 575 | Families Genera Species | Taxom
| Branchiopoda Latreille, 1817 Branchiopods, Brine shrimps, Daphnia, Fairy shrimps and Water fleas, Phyllopods | 9 16 18 | Families Genera Species | Taxom
| Chilopoda Latreille, 1817 Centiped, Centipede, Centipedes, Centipeds, Chilopods | 5 6 10 | Families Genera Species | Taxom
| Diplopoda De Blainville in Gervais, 1844 Diplopods, Millepedes, Millipede, Millipedes | 12 25 28 | Families Genera Species | Taxom
| Entognatha Stummer-Traunfels, 1891 Entognathids | 13 31 45 | Families Genera Species | Taxom
| Insecta Linnaeus, 1758 Insects, True insects | 487 4492 8586 | Families Genera Species | Taxom
| Malacostraca Latreille, 1802 Higher Crustaceans, Malacostracans | 41 57 74 | Families Genera Species | Taxom
| Maxillopoda Dahl, 1956 Maxillopods | 7 14 16 | Families Genera Species | Taxom
| Merostomata Woodward, 1866 Horseshoe crabs, Merostomates | 2 4 2 | Families Genera Species | Taxom
| Ostracoda Latreille, 1802 Mussel shrimps, Ostracods, Seed Shrimps | 37 72 79 | Families Genera Species | Taxom
| Trilobita ♰ Walch, 1771 Trilobites | 23 32 18 | Families Genera Species | Taxom
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