Phylum Annelida characters and classification explain

Phylum Annelida general characters and classification up to order full explained in Hindi by Muskan perween.
Annelids are also known as segmented worms . Annelids are different from those unsegmented worms i.e. flatworms (platyhelminthes) and roundworms (aschelminthes) in many aspects. They are well organized animals compare to other previous phyla . First animal group having close blood vascular system.
Phylum Annelida Divided into four classes on the basis of their morphological characters:
1) polychaeta - e.g. Nereis a.k.a. clamworm
2) oligochaeta - e.g. pheretima a.k.a. earthworm
3) hirudinaria - e.g. hirudinea a.k.a. leech
4) archiannelida - polygordius
Notes with the appropriate diagrams.
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