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 (12 686)
- Kingdom Animalia (9 792)
- 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)
- Order Amphinomida (15)
- Order Eunicida (35)
- Order Phyllodocida (216)
- Suborder Aphroditiformia (63)
- Superfamily Aphroditoidea
- Superfamily Chrysopetalacea
- Family Aphroditidae Malmgren, 1867 (6)
- Family Polynoidae Kinberg, 1856 (54)
- Subfamily Bathymacellinae Pettibone, 1976 accepted as Macellicephalinae Hartmann-Schröder, 1971
- Subfamily Eulagiscinae Pettibone, 1997 (5)
- Subfamily Lepidastheniinae Pettibone, 1989 (2)
- Subfamily Lepidonotinae Willey, 1902 (2)
- Subfamily Macellicephalinae Hartmann-Schröder, 1971 (4)
- Tribe Macellicephalini Hartmann-Schröder, 1971 (1)
- Genus Bathyeliasona Pettibone, 1976 (1)
- Genus Bathymacella Pettibone, 1976 (1)
- Species Bathymacella uschakovi (Averincev, 1972)
- Genus Macella Averincev, 1972 accepted as Bathymacella Pettibone, 1976
- Genus Macelloides Uschakov, 1957 (1)
- Subfamily Macelloidinae Pettibone, 1976 accepted as Macellicephalinae Hartmann-Schröder, 1971
- Subfamily Polynoidae incertae sedis (1)
- Subfamily Polynoinae Kinberg, 1856 (40)
- Family Sigalionidae Kinberg, 1856 (3)
- Suborder Glyceriformia (7)
- Suborder Nereidiformia (64)
- Suborder Phyllodocida incertae sedis (37)
- Suborder Phyllodociformia (45)
- Subclass Polychaeta incertae sedis (11)
- Subclass Sedentaria (261)
- Order Sipuncula (15)
- Phylum Arthropoda (4 265)
- 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)
