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 prosobranch addendum for Velutinids and other prosobranchs that are often mistaken for opisthobranchs. |