Worms are elongated invertebrates that can generally be divided into three groups, including flatworms, roundworms and segmented worms. Most worms have bristles or fins that help them move.
Ascaris, a genus of parasitic roundworms. Members of this genus are widely distributed, and are especially numerous in warm, moist climates.
Earthworm, a long, slender worm. It is found in damp soils of regions having moderate or warm climates.
Flatworm, a worm with a soft, flat body. Some flatworms live in water, chiefly in the sea, but most are parasites that live in the bodies of other animals.
Hairworm, a long, slender worm found in many ponds or quiet streams. Hairworms are sometimes called horsehair worms and horsehair snakes because it was once thought they were worms or tiny snakes that developed from horsehairs that fell into water.
Roundworm, or Nematode, a slender, cylindrical worm. Roundworms are of worldwide distribution and are found in freshwater and saltwater, in plants and animals, and in the soil.
Tapeworm, a parasitic flat worm. The tapeworm has a long, flat body made up of a head, a neck, and a chain of segments, or sections.