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In this article we will discuss about the structure of Earthworm (Pheretima) with the help of a diagram.
1. It is commonly known as earthworm and is terrestrial and burrowing in habit.
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2. Body bilaterally symmetrical, triploblastic and metamerically segmented.
3. No distinct head or appendage but a distinct prostomium is present.
4. Clitellumis present in segments 14-16.
5. Single female opening is present in 14th segment, paired male openings in 18th segment and paired genital papillae in the 17th and 19th segment.
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6. Anus terminal. The setae are buried in the body-wall all over the surface.
7. Hermaphrodite and reproduction is sexual and is followed by a cocoon formation.
8. Coelom distinct, spacious and coelomic fluid contains coelomic corpuscles.