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Phylum Annelida
Tuesday 6 September 2016 • 21:12 • 0 comments

Unique characteristics of Phylum Annelida

Base on evolutionary relationship of animals:

Level of cell organization    : Organ system
Germ layers                    : Triploblastic
Body plan(symmetry)           : Bilaterally symmetry
Body cavity                         : Coelomate
Segmentation                       : Metameric segmentation
- Excretory system is nephridium

- Have complete digestive system:

* Mouth,long tube & anus
* Digestive tract with anterior mouth & posterior anus
* One-way digestive tract
Classes of Phylum Annelida:

·        Class Oligochaeta (earthworm: Pheretima sp.)
·        Class Polychaeta (rag worm: Nereis sp.)
·        Class Hirudinea (leech: Hirudo sp.)



Class Oligochaeta:
Pheretima sp.





Class Polychaeta:
Nereis sp.




Class Hirudinea:
Hirudo sp.








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