Nudibranchs (Nudibranchia) is a biological order of the phylum Mollusca (Molluscs) and class Gastropoda (Gastropods).
Actinocyclidae
Aegiridae
Aeolidiidae
Aldisidae
Antiopellidae
Aranucidae
Archidorididae
Arminidae
Asteronotidae
Babakinidae
Bathydorididae
Bornellidae
Calmidae
Calycidorididae
Charcotiidae
Chromodorididae
Conualeviidae
Corambidae
Coryphellidae
Cumanotidae
Cuthonidae
Dendrodorididae
Dendronotidae
Dironidae
Discodorididae
Dorididae
Doridoeididae
Doridoxidae
Dotidae
Dotoidae
Eubranchidae
Facelinidae
Favorinidae
Fionidae
Flabellinidae
Glaucidae
Gonieolididae
Goniodorididae
Gymnodorididae
Halgerdidae
Hancockiidae
Heroidae
Heterodorididae
Hexabranchidae
Janolidae
Kentrodorididae
Lomanotidae
Madrellidae
Myrrhinidae
Notaeolidiidae
Onchidorididae
Phyllidiidae
Phylliroidae
Platydorididae
Polyceridae
Pseudovermidae
Rostangidae
Scyllaeidae
Spurillidae
Tergipedidae
Tethydidae
Triophidae
Tritoniidae
Vayssiereidae
Acochlidioidea
Anaspidea
Archaeogastropoda
Archaeopulmonata
Architaenioglossa
Basommatophora
Cephalaspidea
Entomotaeniata
Gymnosomata
Heterostropha
Mesogastropoda
Neogastropoda
Neotaenioglossa
Neritopsina
Notaspidea
Nudibranchia
Patellogastropoda
Rhodopemorpha
Sacoglossa
Soleolifera
Stylommatophora
Systellommatophora
Thecosomata