The perfect fishing bait.

The term worm is used to describe many different distantly-related animals which have a long cylindrical body and no legs.

Worms usually have a cylindrical, flattened, or leaf-like body shape and are often without any true limbs or appendages. Instead, they may have bristles or fins that help them move. A few have light-sensing organs. Worms vary in size from less than 1 mm (0.04 inch) in certain aschelminths to more than 30 m (100 feet) in certain ribbon worms.

Some worms reproduce sexually. Hermaphroditism, the condition in which a single individual possesses both male and female reproductive parts, is common in many groups of worms. Asexual reproduction, whereby new individuals develop from the body cells of another, also occurs in some worms…

The term worm (vermes) refers to an obsolete taxon used by Carolus Linnaeus and Jean-Baptiste Lamarck for all non-arthropod invertebrate animals, and stems from the Old Norse word for sea serpent. Currently it is used to describe many different distantly-related animals which have a long cylindrical body and no legs. Most animals called “worms” are invertebrates, but the term is also used for the amphibian caecilians and the slow worm Anguis, a legless burrowing lizard. Invertebrate animals commonly called “worms” include annelids (earthworms), nematodes (roundworms), flatworms, marine polychaete worms (bristle worms), marine nemertean worm (“bootlace worms”), and insect larvae such as caterpillars, grubs, and maggots. Worms vary in size from microscopic to over a metre in length for marine polychaete worms (bristle worms), 6.7 m (22 ft) for the African giant earthworm, Microchaetus, and 55 m (180 ft) for the marine nemertean worm (bootlace worm), Lineus longissimus. Historical English-speaking cultures have used the (now deprecated) terms worm, wurm, or wyrm to describe carnivorous reptiles (“serpents”), and the related mythical beasts dragons.
text source