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Common name: Horsehair Worms
Name derivation: "thread form"
Order Count: 2
Family Count: 3
Genus Count: 19
Species Count: 356
Earliest Fossil Record: Middle Cretaceous 100 mya
Habitat: Freshwater, Parasitic
Size Range: 1 cm to 40 cm
Number of known Species: 356
Earliest Fossil Record: Middle Cretaceous 100 mya
Notes: Based on Catalogue of Life as of March 2025