Please answer the following question: Information:  - Slug, or land slug, is a common name for any apparently shell-less terrestrial gastropod mollusc. The word "slug" is also often used as part of the common name of any gastropod mollusc that has no shell, a very reduced shell, or only a small internal shell, particularly sea slugs and semislugs (this is in contrast to the common name "snail", which applies to gastropods that have a coiled shell large enough that the animal can fully retract its soft parts into the shell).  - Discodorididae is a taxonomic family of sea slugs , specifically dorid nudibranchs , marine gastropod mollusks in the superfamily Doridoidea . Species in this family belong to the cryptobranch dorid nudibranchs , i.e. they are able to retract their gills into a gill pocket ( cryptobranch = hidden gills ) . Most are small and hard to identify . Most are thought to feed at night on sponges , while during the day they search for dark areas or remain hidden under rocks . One example of a discodoridid is the `` Pacific sea lemon '' or `` speckled sea lemon '' , Peltodoris nobilis , which occurs off the coast of British Columbia to Baja California from low - tide waters to a depth of about 200 m. Not only is this species yellow with a bumpy surface , but it also gives off a strong fruity citrus smell when handled , adding to its resemblance to a lemon .  - Doridacea is a taxonomic grouping of dorid nudibranchs, shell-less marine gastropod mollusks. included in the clade Euctenidiacea of the clade Nudibranchia.  - Doridoidea, commonly known as dorid nudibranchs (and previously known as the taxon Cryptobranchia), are a taxonomic superfamily of medium to large, shell-less sea slugs, marine gastropod mollusks in the clade Doridacea, included in the clade Nudibranchia.    What entity does 'discodorididae' has the relation 'parent taxon' with?
Answer:
nudibranchia