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Common name: Acorn Worms
Name derivation: “half chord”
Order Count: 1
Family Count: 7
Genus Count: 25
Species Count: 139
Earliest Fossil Record: Early Cambrian 538 – 521 mya
Habitat: Marine
Size Range: Individual 3 mm to 25 cm, Colony 2.9 mm to 2.5 m
Notes: Based on Catalogue of Life as of March 2025