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)
- Subphylum Chelicerata (6)
- Subphylum Crustacea (162)
- Superclass Allotriocarida (28)
- Superclass Multicrustacea (134)
- Class Copepoda (16)
- Infraclass Neocopepoda (16)
- Superorder Gymnoplea (6)
- Superorder Podoplea (10)
- Order Cyclopoida (5)
- Suborder Cyclopida (3)
- Suborder Ergasilida (1)
- Family Mytilicolidae Bocquet & Stock, 1957 (1)
- Genus Mytilicola Steuer, 1902 (1)
- Species Mytilicola intestinalis Steuer, 1902
- Suborder Oithonida (1)
- Suborder Poecilostomatoida accepted as Ergasilida
- Order Harpacticoida (5)
- Class Hexanauplia accepted as Thecostraca
- Class Malacostraca (113)
- Class Thecostraca (5)
- 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