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Common name: Peanut Worms
Name derivation: “little tube”
Number of Orders: 4
Number of Families: 6
Number of Genus: 17
Number of known Species: 205
Earliest Fossil Record: Early Cambrian 520 mya
Habitat: Marine
Size Range: 2 mm to 40 cm
Notes: Treated by some as a class of Annelids. Based on Catalogue of Life as of July 2024