A worm is generally classified as an invertebrate animal, and “worms” include several unrelated groups rather than one single biological category. Common examples are flatworms, roundworms, and segmented worms such as earthworms.

Quick Scoop

  • Kingdom: Animalia, for true worms.
  • Body type: Soft-bodied, elongated, and without a backbone.
  • Main groups: Flatworms, roundworms, and segmented worms.

Simple version

If you mean the animal, a worm is classified as an invertebrate.

If you mean a more specific type, it depends on the worm:

  • Flatworms = phylum Platyhelminthes.
  • Roundworms = phylum Nematoda.
  • Segmented worms = phylum Annelida.

One important note

“Worm” is a common name, not one neat scientific group, so different worms can belong to different phyla.

If you want, I can also give you the classification of a specific worm , like an earthworm, tapeworm, or roundworm.