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 (879)
- Kingdom Animalia (681)
- Phylum Annelida (119)
- Class Clitellata (35)
- Subclass Hirudinea (2)
- Infraclass Euhirudinea (2)
- Order Arhynchobdellida (1)
- Family Erpobdellidae Moore, 1908 (1)
- Order Rhynchobdellida (1)
- Subclass Oligochaeta (33)
- Class Polychaeta (84)
- 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