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 (12 687)
- Kingdom Animalia (9 793)
- Phylum Acanthocephala (30)
- Phylum Annelida (618)
- Phylum Arthropoda (4 266)
- Phylum Brachiopoda (64)
- Phylum Bryozoa (363)
- Phylum Cephalorhyncha
- Phylum Chaetognatha (25)
- Phylum Chordata (1 415)
- Phylum Cnidaria (460)
- Phylum Ctenophora (11)
- Phylum Dicyemida (1)
- Phylum Echinodermata (638)
- Phylum Ectoprocta accepted as Bryozoa
- Phylum Entoprocta
- Phylum Gastrotricha (1)
- Phylum Gnathostomulida
- Phylum Hemichordata (6)
- Phylum Kinorhyncha (9)
- Phylum Loricifera
- Phylum Mesozoa accepted as Dicyemida
- Phylum Mollusca (753)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Bivalvia (125)
- Subclass Autobranchia (99)
- Subclass Protobranchia (26)
- Order Nuculanida (23)
- Superfamily Nuculanoidea H. Adams & A. Adams, 1858 (1854) (22)
- Family Bathyspinulidae Coan & Valentich-Scott, 1997 (1)
- Genus Acutispinula Filatova & Schileyko, 1984 accepted as Bathyspinula J. A. Allen & H. L. Sanders, 1982
- Genus Bathyspinula J. A. Allen & H. L. Sanders, 1982 (1)
- Genus Spinula Dall, 1908 accepted as Bathyspinula J. A. Allen & H. L. Sanders, 1982
- Family Malletidae H. Adams & A. Adams, 1858 accepted as Malletiidae H. Adams & A. Adams, 1858 (1846)
- Family Malletiidae H. Adams & A. Adams, 1858 (1846) (7)
- Family Nuculanidae H. Adams & A. Adams, 1858 (1854) (5)
- Family Poroledidae Scarlato & Starobogatov, 1979 accepted as Poroledinae Scarlato & Starobogatov, 1979
- Family Siliculidae J. A. Allen & H. L. Sanders, 1973 (1)
- Family Tindariidae A. E. Verrill & K. J. Bush, 1897 (2)
- Family Yoldiidae Dall, 1908 (6)
- Superfamily Sareptoidea Stoliczka, 1870 (1)
- Order Nuculida (3)
- Class Caudofoveata (1)
- Class Cephalopoda (80)
- Class Gastropoda (426)
- Class Monoplacophora
- Class Polyplacophora (12)
- Class Scaphopoda (11)
- Class Solenogastres (98)
- Subclass Chaetodermomorpha accepted as Caudofoveata
- Phylum Nematoda (396)
- Phylum Nemertea (75)
- Phylum Nemertina represented as Nemertea
- Phylum Platyhelminthes (134)
- Phylum Pogonophora accepted as Siboglinidae Caullery, 1914
- Phylum Porifera (281)
- Phylum Priapulida (4)
- Phylum Rotifera (163)
- Phylum Tardigrada (80)
- Kingdom Archaea (1)
- Kingdom Bacteria (310)
- Kingdom Chromista (956)
- Kingdom Fungi (740)
- Kingdom Plantae (822)
- Kingdom Protozoa (65)
