Acaenomolgus Humes & Stock, 1972 (basis of record)
Acaenomolgus protulae (Stock, 1959) (basis of record)
Acaenomolgus serpulae (Stock, 1960) (basis of record)
Acanthochondria Oakley, 1930 (basis of record)
Acanthochondria clavata (Bassett-Smith, 1896) (basis of record)
Acanthochondria cornuta (Müller O.F., 1776) (basis of record)
Acanthochondria limandae (Krøyer, 1863) (basis of record)
Acanthochondria soleae (Krøyer, 1838) (basis of record)
Acanthochondria triglae Herrera-Cubilla & Raibaut, 1990 (basis of record)
Acanthochondrites Oakley, 1930 (basis of record)
Acanthochondrites annulatus (Olsson, 1869) (basis of record)
Acartia Dana, 1846 (basis of record)
Acartia adriatica Steuer, 1910 represented as Acartia (Hypoacartia) adriatica Steuer, 1910 (basis of record)
Acartia bifilosa (Giesbrecht, 1881) represented as Acartia (Acanthacartia) bifilosa (Giesbrecht, 1881) (basis of record)
Acartia centrura Giesbrecht, 1889 represented as Acartia (Odontacartia) centrura Giesbrecht, 1889 (basis of record)
Acartia clausi Giesbrecht, 1889 represented as Acartia clausii Giesbrecht, 1889 represented as Acartia (Acartiura) clausi Giesbrecht, 1889 (basis of record)
Acartia danae Giesbrecht, 1889 represented as Acartia (Acartia) danae Giesbrecht, 1889 (basis of record)
Acartia discaudata (Giesbrecht, 1882) represented as Acartia (Acartiura) discaudata (Giesbrecht, 1881) (basis of record)
Acartia enzoi Crisafi, 1974 represented as Acartia (Acartiura) enzoi Crisafi, 1974 (basis of record)
Acartia fossae Gurney, 1927 represented as Acartia (Acanthacartia) fossae Gurney, 1927 (basis of record)
Acartia italica Steuer, 1910 represented as Acartia (Acanthacartia) italica Steuer, 1910 (basis of record)
Acartia longiremis (Lilljeborg, 1853) represented as Acartia (Acartiura) longiremis (Lilljeborg, 1853) (basis of record)
Acartia margalefi Alcaraz, 1976 represented as Acartia (Acartiura) margalefi Alcaraz, 1976 (basis of record)
Acartia negligens Dana, 1849 represented as Acartia (Acartia) negligens Dana, 1849 (basis of record)
Acartia plumosa Scott T., 1894 represented as Acartia (Acanthacartia) plumosa Scott T., 1894 (basis of record)
Acartia teclae Bradford, 1976 represented as Acartia (Acartiura) teclae Bradford, 1976 (basis of record)
Acartia tonsa Dana, 1849 represented as Acartia (Acanthacartia) tonsa Dana, 1849 (basis of record)
Acartiidae Sars G.O., 1903 (basis of record)
Acontiophorus Brady, 1880 (basis of record)
Acontiophorus antennatus Hansen, 1923 (basis of record)
Acontiophorus armatus Brady, 1880 (basis of record)
Acontiophorus bracatus Stock & Kleeton, 1963 accepted as Orecturus bracatus (Stock & Kleeton, 1963) (basis of record)
Acontiophorus ornatus (Brady & Robertson, 1876) (basis of record)
Acontiophorus scutatus (Brady & Robertson, 1873) (basis of record)
Acrocalanus Giesbrecht, 1888 (basis of record)
Acrocalanus andersoni Bowman, 1958 (basis of record)
Acrocalanus gibber Giesbrecht, 1888 (basis of record)
Acrocalanus longicornis Giesbrecht, 1888 (basis of record)
Advena Kabata, 1979 accepted as Kabatazus Özdikmen, 2008 (basis of record)
Advena paradoxa (Beneden, 1851) accepted as Kabatazus paradoxus (Beneden, 1851) (basis of record)
Aetideidae Giesbrecht, 1892-1893 (basis of record)
Aetideopsis Sars G.O., 1903 (basis of record)
Aetideopsis armata (Boeck, 1872) (basis of record)
Aetideopsis carinata Bradford, 1969 (basis of record)
Aetideopsis multiserrata (Wolfenden, 1904) (basis of record)
Aetideopsis rostrata Sars G.O., 1903 (basis of record)
Aetideus Brady, 1883 (basis of record)
Aetideus acutus Farran, 1929 (basis of record)
Aetideus arcuatus (Vervoort, 1949) (basis of record)
Aetideus armatus (Boeck, 1872) (basis of record)
Aetideus giesbrechti Cleve, 1904 (basis of record)
Agetus Krøyer, 1849 (basis of record)
Agetus flaccus (Giesbrecht, 1891) (basis of record)
Agetus limbatus (Brady, 1883) (basis of record)
Agetus typicus Krøyer, 1849 (basis of record)
Akessonia Bresciani & Lützen, 1962 (basis of record)
Akessonia occulta Bresciani & Lützen, 1962 (basis of record)
Albionella Kabata, 1979 accepted as Neoalbionella Özdikmen, 2008 (basis of record)
Albionella globosa (Leigh-Sharpe, 1918) accepted as Neoalbionella globosa (Leigh-Sharpe, 1918) (basis of record)
Alebion Krøyer, 1863 (basis of record)
Alebion carchariae Krøyer, 1863 (basis of record)
Alella Leigh-Sharpe, 1925 (basis of record)
Alella macrotrachelus (Brian, 1906) accepted as Alella pagelli (Krøyer, 1863) (basis of record)
Alella pagelli (Krøyer, 1863) (basis of record)
Allantogynus Changeux, 1960 (basis of record)
Allantogynus delamarei Changeux, 1960 (basis of record)
Amallophora Scott T., 1894 accepted as Xanthocalanus Giesbrecht, 1893 (basis of record)
Amallothrix Sars G.O., 1925 (basis of record)
Amallothrix arcuata (Sars G.O., 1920) (basis of record)
Amallothrix emarginata (Farran, 1905) accepted as Pseudoamallothrix emarginata (Farran, 1905) (basis of record)
Amallothrix falcifer (Farran, 1926) (basis of record)
Amallothrix farrani Rose, 1942 (basis of record)
Amallothrix gracilis (Sars G.O., 1905) (basis of record)
Amallothrix paravalida (Brodsky, 1950) (basis of record)
Amallothrix pseudoarcuata (Park, 1970) (basis of record)
Amallothrix robusta (Scott T., 1894) (basis of record)
Amallothrix sarsi Rose, 1942 (basis of record)
Anomalocera Templeton, 1837 (basis of record)
Anomalocera patersoni Templeton, 1837 accepted as Anomalocera patersonii Templeton, 1837 (basis of record)
Anomoclausia Gotto, 1964 (basis of record)
Anomoclausia indrehusae Gotto, 1964 (basis of record)
Anomoclausiidae Gotto, 1964 (basis of record)
Anomopsyllus Sars G.O., 1921 (basis of record)
Anomopsyllus abyssorum Laubier, 1988 (basis of record)
Anomopsyllus pranizoides Sars G.O., 1921 (basis of record)
Antheacheres Sars M., 1857 (basis of record)
Antheacheres duebeni Sars M., 1857 represented as Antheacheres duebenii Sars M., 1857 (basis of record)
Antheacheridae Sars M., 1870 (basis of record)
Anthessiidae Humes, 1986 (basis of record)
Anthessius Della Valle, 1880 (basis of record)
Anthessius arenicolus (Brady, 1872) (basis of record)
Anthessius leptostylis (Sars G.O., 1916) (basis of record)
Anthessius teissieri Bocquet & Stock, 1958 (basis of record)
Anthosoma Leach, 1816 (basis of record)
Anthosoma crassum (Abildgaard, 1794) (basis of record)
Aphanodomus Wilson C.B., 1924 (basis of record)
Aphanodomus terebellae (Levinsen, 1878) (basis of record)
Aphotopontius Humes, 1987 (basis of record)
Aphotopontius atlanteus Humes, 1996 (basis of record)
Aphotopontius temperatus Humes, 1997 accepted as Aphotopontius atlanteus Humes, 1996 (basis of record)