Worm
A worm is a general term for many unrelated invertebrate animals with soft, elongated bodies, usually lacking legs and a backbone.
Worms are a common name for many unrelated invertebrate animals with soft, elongated bodies. They are not a single scientific group, though they share a similar body plan.
What it is
In biology, worm is a descriptive common name, not a formal classification. It covers several distantly related animal phyla including flatworms, roundworms, and segmented worms.
Key groups
Major worm groups include Platyhelminthes (flatworms), Nematoda (roundworms), and Annelida (segmented worms). Each group differs in anatomy, ecology, and life cycle.
Why it matters
Worms play important roles in soil ecology, gardening, and composting. In Canada, earthworms are especially vital for decomposition and soil health.
In short
- The word worm refers to many unrelated animals, not one biological group.
- Most worms are invertebrates with long, soft bodies.
- Common worm groups include flatworms, roundworms, and segmented worms.
- The term also appears in computing as a self-replicating program.
Worms are familiar to Canadian readers through soil ecology, gardening, composting, fisheries, and parasitology; earthworms are especially important in Canadian soils and decomposition processes.
Quick questions
Is a worm a single scientific animal group?
What animals are called worms?
Are all worms invertebrates?
Sources
- Britannica — https://www.britannica.com/animal/wormSupports: Defines worm as a general term for various unrelated invertebrate animals and lists major groups.
- Britannica Kids — https://kids.britannica.com/kids/article/worm/353935Supports: Explains that worms are soft-bodied invertebrates, not all related, and gives broad group examples.
- Encyclopedia.com — https://www.encyclopedia.com/plants-and-animals/animals/zoology-invertebrates/wormSupports: States worms are various creeping or burrowing invertebrates and notes common groupings.
- University of Hawaiʻi — https://manoa.hawaii.edu/exploringourfluidearth/biological/invertebrates/worms-phyla-platyhelmintes-nematoda-and-annelidaSupports: Describes worms as several distinct phyla with bilateral symmetry and basic body-plan traits.