Phylum Annelida

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This PPT is for F.Y.B.Sc students of course I Semester I, belonging to Mumbai University of Maharashtra India
You can email at sudesh_rathod@yahoo.co.in for further query.

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Phylum Annelida

  1. 1. PHYLUM ANNELIDA(Metamerically segmented and coelomate animals) Prof. S D Rathod
  2. 2. Annelids Soft bodied, triploblastic, bilaterally symmetrical and true coelomates Divided into the segments called as annuli Excretion is performed by nephridia
  3. 3.  Nervous system well developed and has brain
  4. 4. Class – Polychaeta: (animals with many setae) Setae are many form lateral parapodia Head is distinct with sensory organs like eyes, tentacles, palps etc Free swimming larval stage is found called as trochophore example - Nereis
  5. 5. Parapodia  Heteronereis
  6. 6. Tube dwelling polychaetes Arenicola Sabella
  7. 7. Class – Oligochaeta: (animals with few setae) Setae few and are arranged segmentally Distinct head eyes and tentacles are absent Clitellum is usually present example - Pheretima (earthworm)
  8. 8. Class – Hirudinea: (Class of leeches) Ectoparasitic and fresh water forms Secrete an enzyme in its gut called as hirudin 33 segments Oral sucker. Posterior sucker Anus is present in 22nd segment on dorsal side.
  9. 9. Leech bite
  10. 10. Good bye!!!!!!

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