Adeonella Busk, 1884 (basis of record)
Adeonella calveti Canu & Bassler, 1930 (basis of record)
Adeonella polystomella (Reuss, 1848) (basis of record)
Adeonellopsis MacGillivray, 1886 (basis of record)
Adeonellopsis distoma (Busk, 1858) (basis of record)
Adeonellopsis multiporosa Aristegui, 1985 (basis of record)
Adeonidae Busk, 1884 (basis of record)
Aetea Lamouroux, 1812 (basis of record)
Aetea anguina (Linnaeus, 1758) (basis of record)
Aetea sica (Couch, 1844) (basis of record)
Aetea truncata (Landsborough, 1852) (basis of record)
Aeteidae Smitt, 1868 (basis of record)
Aethozoon Hayward, 1978 (basis of record)
Aethozoon pellucidum Hayward, 1978 (basis of record)
Alcyonidiidae Johnston, 1837 (basis of record)
Alcyonidium Lamouroux, 1813 (basis of record)
Alcyonidium albidum Alder, 1857 (basis of record)
Alcyonidium candidum Ryland, 1963 (basis of record)
Alcyonidium cellarioides Calvet, 1900 (basis of record)
Alcyonidium diaphanum (Hudson, 1778) (basis of record)
Alcyonidium disciforme Smitt, 1872 (basis of record)
Alcyonidium duplex Prouho, 1892 (basis of record)
Alcyonidium gelatinosum (Linnaeus, 1761) (basis of record)
Alcyonidium hirsutum (Fleming, 1828) (basis of record)
Alcyonidium mamillatum Alder, 1857 (basis of record)
Alcyonidium mytili Dalyell, 1848 accepted as Alcyonidioides mytili (Dalyell, 1848) (basis of record)
Alcyonidium parasiticum (Fleming, 1828) (basis of record)
Alcyonidium variegatum Prouho, 1892 (basis of record)
Alderina Norman, 1903 (basis of record)
Alderina imbellis (Hincks, 1860) (basis of record)
Amathia Lamouroux, 1812 (basis of record)
Amathia distans Busk, 1886 (basis of record)
Amathia guernseii Chimonides, 1987 (basis of record)
Amathia intermedis Chimonides, 1987 (basis of record)
Amathia lendigera (Linnaeus, 1758) (basis of record)
Amathia pruvoti Calvet, 1911 (basis of record)
Amathia semiconvoluta Lamouroux, 1824 (basis of record)
Amathia tortuosa Tenison-Woods, 1880 (basis of record)
Amathia vidovici (Heller, 1867) (basis of record)
Ammatophora Norman, 1903 (basis of record)
Ammatophora nodulosa (Hincks, 1877) (basis of record)
Amphiblestrum Gray, 1848 (basis of record)
Amphiblestrum auritum (Hincks, 1877) (basis of record)
Amphiblestrum flemingii (Busk, 1854) (basis of record)
Amphiblestrum lyrulatum (Calvet, 1907) (basis of record)
Amphiblestrum solidum (Packard, 1863) (basis of record)
Anarthropora Smitt, 1868 (basis of record)
Anarthropora monodon (Busk, 1860) (basis of record)
Anguinella van Beneden, 1845 (basis of record)
Anguinella palmata Van Beneden, 1845 (basis of record)
Annectocyma Hayward & Ryland, 1985 (basis of record)
Annectocyma arcuata (Harmelin, 1976) (basis of record)
Annectocyma major (Johnston, 1847) (basis of record)
Annectocyma tubulosa (Busk, 1875) (basis of record)
Annectocymidae Hayward & Ryland, 1985 (basis of record)
Aplousina Canu & Bassler, 1927 (basis of record)
Aplousina capriensis (Waters, 1898) (basis of record)
Aplousina filum (Jullien & Calvet, 1903) (basis of record)
Arachnidiidae Hincks, 1880 (basis of record)
Arachnidium Hincks, 1859 (basis of record)
Arachnidium clavatum Hincks, 1877 (basis of record)
Arachnidium fibrosum Hincks, 1880 (basis of record)
Arachnidium hippothooides Hincks, 1859 (basis of record)
Arachnoidea Moore, 1903 (basis of record)
Arctonula Gordon & Grischenko, 1994 (basis of record)
Arctonula arctica (M. Sars, 1851) (basis of record)
Arthropoma Levinsen, 1909 (basis of record)
Arthropoma cecilii (Audouin, 1826) (basis of record)
Ascorhiza Fewkes, 1889 (basis of record)
Ascorhiza mawatarii d'Hondt, 1983 (basis of record)
Ascosia Jullien, 1882 (basis of record)
Ascosia pandora Jullien, 1882 (basis of record)
Ascosiidae Jullien, 1882 (additional source)
Aspidelectra Levinsen, 1909 (basis of record)
Aspidelectra melolontha (Landsborough, 1852) (basis of record)
Bantariella Jebram, 1973 (basis of record)
Bantariella verticillata (Heller, 1867) (basis of record)
Beania Johnston, 1840 (basis of record)
Beania hirtissima (Heller, 1867) (basis of record)
Beania magellanica (Busk, 1852) (basis of record)
Beania mirabilis Johnston, 1840 (basis of record)
Beania thula Hayward, 1994 (basis of record)
Beaniidae Canu & Bassler, 1927 (basis of record)
Benedenipora Pergens, 1889 (basis of record)
Benedenipora catenata Pergens, 1889 (basis of record)
Benedenipora delicatula d'Hondt & Geraci, 1975 (basis of record)
Benedeniporidae Delage & Hérouard, 1897 (basis of record)
Bicellariella Levinsen, 1909 (basis of record)
Bicellariella ciliata (Linnaeus, 1758) (basis of record)
Bicellarina Levinsen, 1909 (basis of record)
Bicellarina alderi (Busk, 1859) (basis of record)
Bicrisia d'Orbigny, 1853 (basis of record)
Bicrisia abyssicola Kluge, 1962 (basis of record)
Bicrisia gibraltarensis Harmelin, 1990 (basis of record)
Bitectiporidae MacGillivray, 1895 (basis of record)
Bowerbankia Farre, 1837 accepted as Amathia Lamouroux, 1812 (basis of record)
Bowerbankia gracilis Leidy, 1855 accepted as Amathia gracilis (Leidy, 1855) (basis of record)
Bowerbankia imbricata (Adams, 1798) accepted as Amathia imbricata (Adams, 1800) (basis of record)
Bryocryptella Cossman, 1906 (basis of record)
Bryocryptella koehleri (Calvet, 1896) (basis of record)