In terms on content heading I would change marine to aquatic as you address both fresh and salt water environments. In hte land heading it is unclear to me if you are trying to state the gastropods are all hemaphrodite or if they have separate sexes. Could you list those families mostly found on land and are there generalizations one could make about their reproduction. I think the way the information is presented and organized in the fresh water section serves as a good example.
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