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Common name: Acorn Worms
Name derivation: “half chord”
Number of Orders: 1
Number of Families: 7
Number of Genus: 25
Number of known Species: 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 July 2024