1) They are exclusively marine gastropods.
2) They have reduced type of shell and when present
often covered with mantle or pedal folds.
3) They do not have operculum usually.
4) They have single gill or often replaced by secondary
branchiae in the form of dorsal outgrowth.
5)They have heart with one auricle posterior to the
ventricle.
6)They have mantle cavity rotated to right side or often
lost due to detorsion.
7)They have nervous system concentrated due to
detorsion.
8) They are hermaphrodite.
Note: - Read about bacteria in http/thallophytes.blogspot.com
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