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Common names:
Name derivation: “hedgehog skin”
Order Count: 53
Family Count: 337
Genus Count: 2,413
Species Count: 11,764
Earliest Fossil Record: Early Cambrian 538 - 521 mya
Habitat: Marine
Size Range: 1.5 mm to 70 cm
Notes: Based on Catalogue of Life as of March 2025