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In this article we will discuss about the structure of Tubifex with the help of a diagram.
1. Fresh water, tubicolous and red coloured obligochaetes found at the muddy bottom of ponds and ditches of U.S.A.
2. Body bilaterally symmetrical, triploblastic and metamerically segmented.
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3. Distinct head and appendages are absent and all the segments are alike.
4. Clitellum is present in 11th & 12th segments throughout life.
5. Male genital openings are present in 11th segment, female openings in 12th segment and heart in 8th segment.
6. Setae are present in 2 dorsal and 2 ventral bundles.
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7. 17th and 19th segments contain paired genital papillae.
8. Hermaphrodite and reproduction usually sexual and is followed by a cocoon formation.