Between brackets is the number of accepted extant species
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Shows the number of accepted extant species within the taxon
The last expanded taxon is highlighted
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- Biota (879)
- Kingdom Animalia (681)
- Phylum Annelida (119)
- Phylum Arthropoda (168)
- Phylum Bryozoa (3)
- Phylum Chaetognatha (2)
- Phylum Chordata (276)
- Phylum Cnidaria (5)
- Phylum Ctenophora (3)
- Phylum Echinodermata (7)
- Phylum Kinorhyncha (2)
- Phylum Mollusca (70)
- Class Bivalvia (36)
- Class Cephalopoda (4)
- Class Gastropoda (29)
- Subclass Caenogastropoda (13)
- Subclass Heterobranchia (15)
- Infraclass Euthyneura (15)
- Subterclass Ringipleura (8)
- Superorder Nudipleura (8)
- Order Nudibranchia (8)
- Suborder Cladobranchia (7)
- Parvorder Aeolidida accepted as Aeolidioidea Gray, 1827
- Parvorder Dendronotida accepted as Dendronotoidea Allman, 1845
- Superfamily Aeolidioidea Gray, 1827 (2)
- Superfamily Cladobranchia incertae sedis
- Superfamily Dendronotoidea Allman, 1845 (1)
- Superfamily Fionoidea Gray, 1857 (3)
- Family Coryphellidae Bergh, 1889 (1)
- Family Cuthonidae Odhner, 1934
- Family Tergipedidae Bergh, 1889 (1)
- Family Trinchesiidae F. Nordsieck, 1972 (1)
- Superfamily Flabellinoidea Bergh, 1889 accepted as Fionoidea Gray, 1857
- Superfamily Proctonotoidea Gray, 1853 (1)
- Superfamily Tritonioidea Lamarck, 1809
- Suborder Dexiarchia accepted as Cladobranchia
- Suborder Doridina (1)
- Suborder Euctenidiacea accepted as Doridina
- Subterclass Tectipleura (7)
- Infraclass Opisthobranchia
- Infraclass Pulmonata
- Subclass Patellogastropoda (1)
- Class Polyplacophora (1)
- Phylum Nematoda (1)
- Phylum Platyhelminthes (1)
- Phylum Porifera (2)
- Phylum Rotifera (22)
- Kingdom Bacteria (5)
- Kingdom Chromista (179)
- Kingdom Plantae (14)
- Kingdom Protozoa