Tuesday, November 22, 2011

characteristics of subclass 3-PULMONATA

1) They are mostly fresh water or terrestrial and few marine .
2) They have typical spiral shell or reduced or absent.If present 
    partly or completely concealed by mantle.
3)They donot have operculum.
4) They have mantle cavity transformed into a pulmonary sac with
   a narrow pore on the right side . Gill is absent.
5) They have heart with one auricle anterior to the ventricle.
6) They are hermaphrodite.





































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