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In this article we will discuss about the structure of Terebella with the help of a diagram.
1. They are red coloured, marine and tubicolous worms found along European and American coasts buried in mud between sea rocks.
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2. Body elongated and measures about 15 to 20 cm. in length and is broad in front and narrow behind.
3. Head is distinct and comprises a horse-shoe shaped prostomium and a peristomium.
4. Peristomium is without cirri but the prostomium bears 2 pairs of eye spots and numerous filiform or filamentous tentacles but no paips.
5. Body divisible into a 10-15′ segmented anterior, 25-30 segmented middle and 25-30 segmented posterior regions.
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6. First two segments bear branched arborescent and comb like gills.
7. The parapodia in anterior and middle region are all alike and are comprised of a notopodium and a neuropodium. The setae are prominent in anterior segments but reduced in posterior segments.
8. Posterior region is without parapodia.
