Phylum - Nematomorpha

Common name: Horsehair Worms

Name derivation: "thread form"

  • Class: Gordioida
  • Class: Nectonematoida

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

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