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Common name: Roundworms
Name derivation: "thread like"
Number of Orders: 17
Number of Families: 266
Number of Genus: 2,353
Number of known Species: 19,143
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 July 2024