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)
- Superclass Annelida incertae sedis (5)
- Class Clitellata (50)
- Class Polychaeta (548)
- Subclass Aciculata accepted as Errantia
- Subclass Echiura (10)
- Subclass Errantia (266)
- Subclass Polychaeta incertae sedis (11)
- Subclass Sedentaria (261)
- Infraclass Canalipalpata (185)
- Infraclass Scolecida (74)
- Order Capitellida
- Order Cossurida
- Order Opheliida
- Order Orbiniida
- Family Arenicolidae Johnston, 1835 (2)
- Family Capitellidae Grube, 1862 (4)
- Family Cossuridae Day, 1963
- Family Maldanidae Malmgren, 1867 (20)
- Family Opheliidae Malmgren, 1867 (9)
- Family Orbiniidae Hartman, 1942 (10)
- Subfamily Microrbiniinae Blake, 2000 (1)
- Subfamily Orbiniinae Hartman, 1942 (9)
- Genus Leitoscoloplos Day, 1977 (5)
- Species Leitoscoloplos abranchiatus (Hartman, 1967)
- Species Leitoscoloplos drakei (Hartman, 1967)
- Species Leitoscoloplos geminus Mackie, 1987
- Species Leitoscoloplos kerguelensis (McIntosh, 1885)
- Species Leitoscoloplos mawsoni (Benham, 1921)
- Genus Leodamas Kinberg, 1866 (2)
- Genus Orbinia Quatrefages, 1866
- Genus Phylo Kinberg, 1866 (2)
- Genus Scoloplos Blainville, 1828
- Subfamily Protoariciinae Hartman, 1957 accepted as Orbiniinae Hartman, 1942
- Genus Aricia Savigny, 1822 accepted as Orbinia Quatrefages, 1866
- Genus Haploscoloplos Monro, 1933 accepted as Leodamas Kinberg, 1866
- Family Paraonidae Cerruti, 1909 (9)
- Family Scalibregmatidae Malmgren, 1867 (12)
- Family Scalibregmidae Malmgren, 1867 accepted as Scalibregmatidae Malmgren, 1867
- Family Travisiidae Hartmann-Schröder, 1971 (8)
- Suborder Chaetopteriformia
- Family Chaetopteridae Audouin & Milne Edwards, 1833 (2)
- Order Sipuncula (15)
- 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)
- 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)
