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ANNELIDA - GENERAL CHARACTERS AND CLASSIFICATION:
The name Annelida was first used by Lamarck in 1809 for the higher segmented worms. The word annelida has been derived either from the Latin word "annullus" meaning little ring or French word "anneler" meaning to arrange in rings.
Annelida are triploblastic, bilaterally symmetrical, coelomate and segmented metazoan.
It includes well known earthworms and leeches.
GENERAL CHARACTERS OF ANNELIDA:
Cephalization is more pronounced with a distinct head bearing tentacles, eyes etc.
They exhibit homonomous metamerism. Body is divided into segments which are separated externally by intersegmental grooves and internally by intersegmental septa.
Body is divided in to three regions - Prostomium, Trunk and Pygidium.
