Between brackets is the number of accepted marine extant species
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Shows the number of accepted marine extant species within the taxon
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- Biota (247 591)
- Kingdom Animalia (211 555)
- Subkingdom Animalia incertae sedis
- Subkingdom Metazoa accepted as Animalia
- Phylum Acanthocephala (516)
- Phylum Annelida (14 112)
- Phylum Arthropoda (59 761)
- Phylum Aschelminthes
- Phylum Brachiopoda (408)
- Phylum Bryozoa (6 532)
- Phylum Cephalorhyncha
- Phylum Chaetognatha (132)
- Phylum Chordata (24 096)
- Phylum Cnidaria (12 585)
- Phylum Ctenophora (184)
- Phylum Cycliophora (2)
- Phylum Dicyemida (122)
- Phylum Echinodermata (7 646)
- Phylum Ectoprocta accepted as Bryozoa
- Phylum Entoprocta (202)
- Phylum Gastrotricha (523)
- Phylum Gnathostomulida (100)
- Phylum Hemichordata (137)
- Phylum Kinorhyncha (348)
- Phylum Loricifera (46)
- Phylum Mesozoa accepted as Dicyemida
- Phylum Mollusca (52 060)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (8 546)
- Class Caudofoveata (143)
- Class Cephalopoda (859)
- Class Conchifera accepted as Bivalvia
- Class Gastropoda (40 498)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (26 448)
- Subclass Gastropoda incertae sedis (1)
- Subclass Heterobranchia (9 000)
- Infraclass "Lower Heterobranchia" (378)
- Infraclass Euthyneura (8 543)
- Subterclass Acteonimorpha (246)
- Subterclass Ringipleura (2 827)
- Subterclass Tectipleura (5 470)
- Superorder Acochlidiimorpha (38)
- Superorder Ascoglossa accepted as Sacoglossa
- Superorder Basommatophora accepted as Hygrophila
- Superorder Eupulmonata (287)
- Superorder Hygrophila (4)
- Superorder Pneumopulmonata
- Superorder Pylopulmonata (3 457)
- Superorder Sacoglossa (371)
- Superorder Siphonarimorpha (141)
- Order Anaspidea accepted as Aplysiida
- Order Aplysiida (91)
- Order Aplysiomorpha accepted as Aplysiida
- Order Archaeopulmonata accepted as Siphonarioidea Gray, 1827
- Order Bullomorpha accepted as Cephalaspidea
- Order Cephalaspidea (842)
- Superfamily Bulloidea Gray, 1827 (217)
- Family Acteocinidae Dall, 1913 accepted as Tornatinidae P. Fischer, 1883
- Family Bullariidae Dall, 1908 accepted as Bullidae Gray, 1827
- Family Bullidae Gray, 1827 (17)
- Family Retusidae Thiele, 1925 (108)
- Genus Clistaxis Cossmann, 1895 accepted as Retusa T. Brown, 1827
- Genus Coelophysis [sic] accepted as Coleophysis P. Fischer, 1883
- Genus Coleophysis P. Fischer, 1883 accepted as Retusa T. Brown, 1827
- Genus Cryptaxis Jeffreys, 1883 accepted as Retusa T. Brown, 1827
- Genus Cylichnina Monterosato, 1884 accepted as Retusa T. Brown, 1827
- Genus Mamilloretusa F. Nordsieck, 1972 accepted as Retusa T. Brown, 1827
- Genus Osorattis Iredale, 1929 (1)
- Genus Pyrunculus Pilsbry, 1895 (18)
- Genus Relichna Rudman, 1971 (6)
- Species Relichna aupouria (A. W. B. Powell, 1937)
- Species Relichna hadra Á. Valdés, 2008
- Species Relichna murdochi (Suter, 1913)
- Species Relichna pachys (R. B. Watson, 1883)
- Species Relichna simplex (Locard, 1897)
- Species Relichna simplex (Murdoch & Suter, 1906) accepted as Relichna murdochi (Suter, 1913)
- Species Relichna sumatrana (Thiele, 1925)
- Species Relichna truncatula (Schepman, 1913) accepted as Diniatys truncatulus (Schepman, 1913)
- Species Relichna venustula (A. Adams, 1862)
- Genus Retusa T. Brown, 1827 (82)
- Genus Spissitydeus Iredale, 1936 (1)
- Genus Sulcoretusa J. Q. Burch, 1945 accepted as Retusa T. Brown, 1827
- Genus Sulcularia Dall, 1921 accepted as Sulcoretusa J. Q. Burch, 1945
- Genus Utriculus T. Brown, 1844 accepted as Retusa T. Brown, 1827
- Family Rhizoridae Dell, 1952 (32)
- Family Tornatinidae P. Fischer, 1883 (60)
- Family Volvulellidae Chaban, 2000 accepted as Rhizoridae Dell, 1952
- Family Volvulidae Locard, 1886 accepted as Rhizoridae Dell, 1952
- Superfamily Cylichnoidea H. Adams & A. Adams, 1854 (155)
- Superfamily Diaphanoidea Odhner, 1914 (1857) accepted as Cylichnoidea H. Adams & A. Adams, 1854
- Superfamily Haminoeoidea Pilsbry, 1895 (131)
- Superfamily Newnesioidea Moles, Wägele, Schrödl & C. Ávila, 2017 (3)
- Superfamily Philinoidea J. E. Gray, 1850 (1815) (322)
- Family Cephalaspidea incertae sedis (14)
- Order Heterostropha accepted as Pyramidellidae J. E. Gray, 1840
- Order Pteropoda (148)
- Order Runcinacea accepted as Runcinida
- Order Runcinida (80)
- Order Tectibranchiata
- Order Thecosomata
- Order Umbraculida (11)
- Superorder Euthyneura incertae sedis
- Infraclass Heterobranchia incertae sedis
- Infraclass Mesoneura (79)
- Infraclass Opisthobranchia
- Infraclass Pulmonata
- Subclass Neomphaliones accepted as Vetigastropoda
- Subclass Neritimorpha (245)
- Subclass Orthogastropoda represented as Gastropoda
- Subclass Patellogastropoda (360)
- Subclass Prosobranchia
- Subclass Psilogastropoda represented as Gastropoda
- Subclass Vetigastropoda (4 444)
- Class Lamellibranchiata accepted as Bivalvia
- Class Loricata accepted as Polyplacophora
- Class Mollusca incertae sedis † (4)
- Class Monoplacophora (31)
- Class Pelecypoda accepted as Bivalvia
- Class Polyplacophora (1 085)
- Class Polyplaxiphora accepted as Polyplacophora
- Class Scaphopoda (581)
- Class Solenoconchia accepted as Scaphopoda
- Class Solenogastres (313)
- Subclass Chaetodermomorpha accepted as Caudofoveata
- Phylum Nematoda (6 754)
- Phylum Nematomorpha (5)
- Phylum Nemertea (1 335)
- Phylum Nemertina represented as Nemertea
- Phylum Nemertini accepted as Nemertea
- Phylum Orthonectida (24)
- Phylum Pentastomida accepted as Pentastomida
- Phylum Phoronida (13)
- Phylum Placozoa (4)
- Phylum Platyhelminthes (13 499)
- Phylum Pogonophora accepted as Siboglinidae Caullery, 1914
- Phylum Porifera (9 468)
- Phylum Priapulida (22)
- Phylum Rotatoria accepted as Rotifera
- Phylum Rotifera (219)
- Phylum Sipunculida accepted as Sipuncula
- Phylum Tardigrada (263)
- Phylum Xenacoelomorpha (437)
- Kingdom Archaea (117)
- Kingdom Bacteria (2 223)
- Kingdom Chromista (20 791)
- Kingdom Fungi (1 432)
- Kingdom Monera represented as Bacteria
- Kingdom Plantae (10 581)
- Kingdom Protozoa (766)
- Kingdom Viruses (115)
