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)
- Phylum Arthropoda (4 265)
- Subphylum Chelicerata (489)
- Subphylum Crustacea (3 772)
- Superclass Allotriocarida (977)
- Superclass Multicrustacea (2 339)
- Class Copepoda (552)
- Class Hexanauplia accepted as Thecostraca
- Class Malacostraca (1 740)
- Subclass Eumalacostraca (1 732)
- Superorder Eucarida (72)
- Superorder Peracarida (1 660)
- Order Amphipoda (962)
- Order Cumacea (92)
- Order Isopoda (403)
- Suborder Anthuridea accepted as Anthuroidea Lilljeborg, 1864
- Suborder Asellota (225)
- Suborder Cymothoida (37)
- Suborder Epicaridea (14)
- Suborder Flabellifera
- Suborder Gnathiidea accepted as Gnathiidae Leach, 1814
- Suborder Limnoriidea (2)
- Suborder Oniscidea (2)
- Suborder Sphaeromatidea (46)
- Superfamily Seroloidea Dana, 1852 (37)
- Family Plakarthriidae Hansen, 1905 (1)
- Family Serolidae Dana, 1852 (36)
- Genus Acanthoserolis Brandt, 1988 (2)
- Genus Acutiserolis Brandt, 1988 (6)
- Genus Brucerolis Poore & Storey, 2009 (2)
- Genus Ceratoserolis Cals, 1977 accepted as Ceratoserolis Brandt, 1988
- Genus Ceratoserolis Brandt, 1988 (4)
- Genus Cristaserolis Brandt, 1988 (2)
- Genus Cuspidoserolis Brandt, 1988 accepted as Acutiserolis Brandt, 1988
- Genus Frontoserolis Brandt, 1991 (6)
- Species Frontoserolis abyssalis Brandt, 2003
- Species Frontoserolis acuminata (Sheppard, 1957)
- Species Frontoserolis aestimabilis (Brandt, 1988)
- Species Frontoserolis aspera (Sheppard, 1933) accepted as Serolella pagenstecheri (Pfeffer, 1887)
- Species Frontoserolis bouvieri (Richardson, 1906) accepted as Serolella bouvieri (Richardson, 1906)
- Species Frontoserolis glacialis (Tattersall, 1921)
- Species Frontoserolis leachi (Brandt, 1988)
- Species Frontoserolis nobilis (Brandt, 1988) accepted as Septemserolis nobilis (Brandt, 1988)
- Species Frontoserolis pagenstecheri (Pfeffer, 1887) accepted as Serolella pagenstecheri (Pfeffer, 1887)
- Species Frontoserolis polita (Pfeffer, 1887) accepted as Paraserolis polita (Pfeffer, 1887)
- Species Frontoserolis reptans (Brandt, 1988) accepted as Septemserolis ovata (Sheppard, 1957)
- Species Frontoserolis septemcarinata (Miers, 1875) accepted as Septemserolis septemcarinata (Miers, 1875)
- Species Frontoserolis serratus (Brandt, 1988) accepted as Ceratoserolis serratus (Brandt, 1988)
- Species Frontoserolis waegelei (Brandt, 1988)
- Genus Paraserolis Wägele, 1994 (1)
- Genus Septemserolis Wägele, 1994 (3)
- Genus Serolella Pfeffer, 1891 (3)
- Genus Serolis Leach, 1818 (4)
- Genus Spinoserolis Brandt, 1988 (2)
- Genus Thysanoserolis Brandt, 1991 (1)
- Superfamily Sphaeromatoidea Latreille, 1825 (9)
- Suborder Valvifera (77)
- Order Lophogastrida (8)
- Order Mysida (56)
- Order Mysidacea accepted as Mysida
- Order Tanaidacea (139)
- Subclass Phyllocarida (8)
- Class Tantulocarida (1)
- Class Thecostraca (46)
- Superclass Oligostraca (456)
- Class Maxillopoda
- Subphylum Myriapoda (4)
- 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)
