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Common name: Roundworms
Name derivation: "thread like"
Order Count: 17
Family Count: 266
Genus Count: 2,465
Species Count: 20,330
Earliest Fossil Record: Early Devonian 396 mya
Habitat: Terrestrial, Freshwater, Marine, Parasitic
Size Range: 0.3 mm to 8.4 m
Notes: Based on Catalogue of Life as of March 2025
< Nemertea Entoprocta >