Between brackets is the number of accepted extant species
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Shows the number of accepted extant species within the taxon
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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)
- Subphylum Tunicata (224)
- Class Appendicularia (61)
- Class Ascidiacea (152)
- Order Aplousobranchia (64)
- Family Clavelinidae Forbes & Hanley, 1848
- Family Diazonidae Seeliger, 1906 (1)
- Family Didemnidae Giard, 1872 (7)
- Family Holozoidae Berrill, 1950 (11)
- Genus Colella Herdman, 1886
- Species Colella pedunculata Herdman, 1886 accepted as Sycozoa sigillinoides Lesson, 1830
- Genus Distaplia Della Valle, 1881 (3)
- Genus Hypsistozoa Brewin, 1953 (1)
- Genus Protoholozoa Kott, 1969 (1)
- Genus Sigillina Savigny, 1816 (2)
- Genus Sycozoa Lesson, 1832 (4)
- Family Placentelidae Kott, 1992 (1)
- Family Polycitoridae Michaelsen, 1904 (3)
- Family Polyclinidae Milne Edwards, 1841 (39)
- Family Ritterellidae Kott, 1992 (2)
- Order Enterogona
- Order Phlebobranchia (18)
- Order Stolidobranchia (70)
- Class Larvacea accepted as Appendicularia
- Class Thaliacea (11)
- Subphylum Vertebrata (1 191)
- 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)
- 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)
