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)
- 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)
- Class Bivalvia (36)
- Subclass Autobranchia (36)
- Infraclass Heteroconchia (32)
- Infraclass Pteriomorphia (4)
- Order Mytilida (2)
- Superfamily Mytiloidea Rafinesque, 1815 (2)
- Family Modiolidae G. Termier & H. Termier, 1950 (1)
- Family Mytilidae Rafinesque, 1815 (1)
- Subfamily Mytilinae Rafinesque, 1815 (1)
- Genus Mytilus Linnaeus, 1758 (1)
- Species Mytilus edulis Linnaeus, 1758
- Order Ostreida (2)
- Class Cephalopoda (4)
- Class Gastropoda (29)
- Class Polyplacophora (1)
- Phylum Nematoda (1)
- Phylum Platyhelminthes (1)
- Phylum Porifera (2)
- Phylum Rotifera (22)
- Kingdom Bacteria (5)
- Kingdom Chromista (179)
- Kingdom Plantae (14)
- Kingdom Protozoa