If you are interested in
related taxa that are not traditionally considered sea slugs (opisthobranchs), please
see the lower heterobranch
addendum and the marine
pulmonate addendum. Both also include some families that have been placed in the Opisthobranchia by some authors.
Although they're not
closely related to sea
slugs, we've added a velutinid
addendum since, outside the Heterobranchia, they're probably the mollusks most easily mistaken for opisthobranchs.
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