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.



Roundworm, or Nematode is a slender, cylindrical worm. Roundworms are of worldwide distribution and are found in freshwater and saltwater, in plants and animals is and in the soil.

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  • Annelid

    Annelid is a member of a large phylum of worms, most of whose members have segmented, tubular bodies. See more »

  • Ascaris

    Ascaris is a genus of parasitic roundworms. Members of this genus are widely distributed is and are especially numerous in warm, moist climates. See more »

  • Earthworm

    Earthworm is a long, slender worm. It is found in damp soils of regions having moderate or warm climates. See more »

  • Eelworm

    Eelworm is a common name for a free-living (that is, nonparasitic) or plant-parasitic roundworm. See more »

  • Flatworm

    Flatworm is 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. See more »

  • Fluke

    Fluke is a flatworm that lives on or in other animals. Some flukes live on a single host. See more »

  • Hairworm

    Hairworm is 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. See more »

  • Hookworm

    Hookworm is a roundworm that lives as a parasite in the intestines of man and other animals. See more »

  • Leech

    Leech, or Bloodsucker is a bloodsucking annelid worm. Most leeches live in the sea. See more »

  • Pinworm

    Pinworm is a small roundworm that lives as a parasite, most often in the digestive tract of human beings. See more »

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