Dr. SEEMA JYOTI Associate Professor Mangaldai

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Dr. SEEMA JYOTI Associate Professor Mangaldai College PHYLUM ANNELIDA INTRODUCTION They are mostly aquatic, burrowing or tubicolous. Some are terrestial and some parasitic or commensal Body elongated, vermiform, bilaterally symmetrical and

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Dr. SEEMA JYOTI
Associate Professor
Mangaldai College PHYLUM ANNELIDA<br>
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INTRODUCTION They are mostly aquatic, burrowing or tubicolous. Some are terrestial and some parasitic or commensal
Body elongated, vermiform, bilaterally symmetrical and triploblastic.
Metamerically segmented.
Body wall consists of cuticle secreted by underlying epidermis.Cuticle is soft and nonchitinous<br>
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Locomotary organs: Segmentally arranged chitinous setae/chaetae embedded in skin or borne on lateral parapodia
True coelom is present
Coelom is filled with coelomic fluid containingcells or corpuscles
Digestive canal is straight complete tube.Digestion is extracellular.
Blood vascular system is of closed type.Blood contains respiratory pigments, either haemoglobin or erythrocruorin.<br>