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.
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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