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Common name: Arrow Worms
Name derivation: "bristle jaws"
Number of Orders: 2
Number of Families: 9
Number of Genus: 26
Number of known Species: 132
Earliest Fossil Record: Early Cambrian 538 - 521 mya
Habitat: Marine
Size Range: 11 mm to 11 cm
Notes: Based on Catalogue of Life as of July 2024