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 (879)
- Kingdom Animalia (681)
- Phylum Annelida (119)
- Class Clitellata (35)
- Class Polychaeta (84)
- Subclass Errantia (38)
- Order Phyllodocida (38)
- Suborder Aphroditiformia (9)
- Family Polynoidae Kinberg, 1856 (7)
- Subfamily Lepidonotinae Willey, 1902 (1)
- Subfamily Polynoinae Kinberg, 1856 (6)
- Genus Bylgides Chamberlin, 1919 (1)
- Genus Gattyana McIntosh, 1897 (1)
- Genus Harmothoe Kinberg, 1856 (3)
- Genus Malmgrenia McIntosh, 1874 (1)
- Species Malmgrenia lunulata (Delle Chiaje, 1830)
- Genus Malmgreniella Hartman, 1967
- Family Sigalionidae Kinberg, 1856 (2)
- Suborder Glyceriformia (2)
- Suborder Nereidiformia (18)
- Suborder Phyllodocida incertae sedis (4)
- Suborder Phyllodociformia (5)
- Subclass Polychaeta incertae sedis (4)
- Subclass Sedentaria (42)
- 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)
- Phylum Nematoda (1)
- Phylum Platyhelminthes (1)
- Phylum Porifera (2)
- Phylum Rotifera (22)
- Kingdom Bacteria (5)
- Kingdom Chromista (179)
- Kingdom Plantae (14)
- Kingdom Protozoa