Q:

What are annelids?

A:

Quick Answer

Annelids are any of the roughly 9,000 segmented worms that make up the Phylum Annelida. Only a few species are known to the average person. These include dew, rain and earthworms commonly found in the soil, lugworms used by fisherman, and smaller redworms used to feed aquarium fish and leeches.

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Full Answer

The bodies of annelids are bilaterally symmetrical and contain three separate sections: a prosomium, a trunk and a pygidium. Annelids have a true, closed circulatory system and lack true respiratory organs. Found almost everywhere in the world, the segmented worms have existed on Earth for at least 120 million years.

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Related Questions

  • Q:

    How is the earthworm adapted to its feeding habits?

    A:

    Earthworms are tube-shaped, segmented worms found living in soil, where they feed on organic matter. An earthworm's digestive tract is laid out straight from the oral orifice to the anus. The parts of the digestive tract regulate or absorb the nutrients from every meal.

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  • Q:

    What are examples of annelids?

    A:

    More than 15,000 species of annelids exist, including earthworms, leeches and polychaetes, which include fireworms, clam worms, lugworms and bristleworms. Earthworms are probably the most commonly known type of annelids; there are more than 2,700 species of earthworms, with the longest species capable of growing up to 22 feet long.

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  • Q:

    What are types of annelids?

    A:

    Sea mice, rag worms, bloodworms, palolo worms and lugworms are types of annelids in the Polychaeta class. Other annelids include earthworms, class Oligochaeta, and leeches, class Hirudinea. Annelids are named for their segmented bodies, which are divided into ring-like sections.

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  • Q:

    How do annelids move?

    A:

    There are two sets of muscles that help annelids move. One expands, and the other contracts the body. Annelids alternate the use of these muscles to achieve locomotion.

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