Between brackets is the number of accepted extant species
Click on "-" to collapse/hide all child taxa
Shows the number of accepted extant species within the taxon
The last expanded taxon is highlighted
Click on "+" to expand/show all child taxa
Click to see the taxon details page
- Biota (12 687)
- Kingdom Animalia (9 793)
- Phylum Acanthocephala (30)
- Phylum Annelida (618)
- Phylum Arthropoda (4 266)
- 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)
- Subphylum Asterozoa (412)
- Subphylum Crinozoa (48)
- Subphylum Echinozoa (178)
- Class Echinoidea (80)
- Subclass Cidaroidea (22)
- Subclass Euechinoidea (58)
- Infraclass Acroechinoidea
- Infraclass Aulodonta (1)
- Infraclass Carinacea (11)
- Infraclass Irregularia (46)
- Subterclass Atelostomata (46)
- Order Holasteroida (17)
- Suborder Meridosternata (17)
- Infraorder Urechinina (17)
- Family Plexechinidae Mooi & David, 1996 (2)
- Family Pourtalesiidae A. Agassiz, 1881 (9)
- Family Urechinidae Duncan, 1889 (6)
- Genus Antrechinus Mooi & David, 1996 (3)
- Genus Cystechinus A. Agassiz, 1879 (1)
- Genus Pilematechinus A. Agassiz, 1904 (1)
- Species Pilematechinus vesica (A. Agassiz, 1879)
- Genus Urechinus A. Agassiz, 1879 (1)
- Order Holasteroida incertae sedis
- Order Spatangoida (29)
- Order Pourtalesioida accepted as Pourtalesiidae A. Agassiz, 1881
- Subclass Palaeozoic Echinoidea †
- Subclass Perischoechinoidea † accepted as Palaeozoic Echinoidea †
- Class Holothuroidea (98)
- 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)
