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Common name: Wheel Animals
Name derivation: "wheel bearer"
Order Count: 7
Family Count: 36
Genus Count: 137
Species Count: 2,467
Earliest Fossil Record: Eocene Epoch 56 - 34 mya
Habitat: Freshwater, Marine
Size Range: 50 μm to 2 mm
Notes: Based on Catalogue of Life as of March 2025