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Common name: Ribbon Worms
Name derivation: "nereid or sea nymph"
Order Count: 8
Family Count: 50
Genus Count: 324
Species Count: 1,369
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 March 2025