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Common name: Ribbon Worms
Name derivation: "nereid or sea nymph"
Number of Orders: 8
Number of Families: 58
Number of Genus: 341
Number of known Species: 1,385
Earliest Fossil Record: Middle Triassic 247 - 237 mya
Habitat: Marine, Freshwater, Terrestrial, Brackish
Size Range: 2 mm to 3 m
Notes: Based on Catalogue of Life as of July 2024