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Common name: Sea Squirts
Name derivation: “tunic”
Order Count: 7
Family Count: 35
Genus Count: 214
Species Count: 3,134
Earliest Fossil Record: Early Cambrian 538 – 521 mya
Habitat: Marine
Size Range: 0.5 mm to 20 m (colonial)
Notes: Based on Catalogue of Life as of March 2025