Wikipedia
Doridoxidae
Doridoxidae, commonly known as doridoxid nudibranchs, are a small, enigmatic taxonomic family of shell-less sea slugs, marine gastropod molluscs in the clade Nudibranchia within the clade Dexiarchia.
Doridoxidae is the only family in the superfamily Doridoxoidea, within the clade Pseudoeuctenidiacea (= Doridoxida).