| worm is any of numerous relatively small elongated soft-bodied
invertebrate animals. The most famous is the earthworm, a member of phylum
Annelida, but there are hundreds of thousands of different species that
live in a wide variety of habitats other than soil.
Originally, the word referred to any creeping or a crawling animal of any kind or size, such as a serpent, caterpillar, snail, or the like. Later this definition was narrowed to the modern definition which still includes several different animal groups. Major phyla include:
* Acanthocephala (spiny-headed worms)
Some other invertebrate groups may be considered worms. Many insect larvae are called worms, such as the railroad worm, glowworm, or bloodworms.