Structural Organisation Of Animals
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Cephalic region
Cadual region
Pre-clitellar region
Posterior sucker
Middle region
1
s
t
-
5
t
h
23
r
d
-
26
t
h
6
t
h
,
7
t
h
a
n
d
8
t
h
27
t
h
-
33
r
d
12
t
h
-
22
n
d