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.

1. PHYLUM ANNELIDA
(Metamerically segmented and coelomate animals)
Prof. S D Rathod

2. Annelids
 Soft bodied, triploblastic,
bilaterally symmetrical
and true coelomates
 Divided into the
segments called as annuli
 Excretion is performed by
nephridia

3.  Nervous system well developed and has brain

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. Parapodia
 Heteronereis

6. Tube dwelling polychaetes
 Arenicola Sabella

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. 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. Leech bite

10. Good bye!!!!!!