Acartia latisetosa (Krichagin, 1873) accepted as Paracartia latisetosa (Krichagin, 1873) (basis of record)
Acartia lefevreae Bradford, 1976 represented as Acartia (Acartiura) lefevreae Bradford, 1976 (basis of record)
Acartiidae Sars G.O., 1903 (additional source)
Achtheres von Nordmann, 1832 (basis of record)
Achtheres percarum von Nordmann, 1832 (basis of record)
Advena paradoxa (Beneden, 1851) accepted as Kabatazus paradoxus (van Beneden, 1851) (source of synonymy)
Aegisthus atlanticus Wolfenden, 1902 accepted as Aegisthus mucronatus Giesbrecht, 1891 (basis of record)
Aetideopsis armatus (Boeck, 1872) accepted as Aetideopsis armata (Boeck, 1872) (basis of record)
Agetus Krøyer, 1849 (source of synonymy)
Agetus flaccus (Giesbrecht, 1891) (source of synonymy)
Agetus limbatus (Brady, 1883) (source of synonymy)
Agetus typicus Krøyer, 1849 (source of synonymy)
Agnathaner Canu, 1892 accepted as Pachypygus Sars G.O., 1921 (basis of record)
Agnathaner Canu, 1892 accepted as Pachypygus Sars G.O., 1921 (source of synonymy)
Agnathaner freemani Hammond, 1968 accepted as Pachypygus freemani (Hammond, 1968) (source of synonymy)
Agnathaner typicus Canu, 1892 accepted as Pachypygus typicus (Canu, 1892) (source of synonymy)
Akessonia Bresciani & Lützen, 1962 (additional source)
Albionella fabricii Rubec & Hogans, 1988 accepted as Neoalbionella fabricii (Rubec & Hogans, 1988) (new combination reference)
Albionella globosa (Leigh-Sharpe, 1918) accepted as Neoalbionella globosa (Leigh-Sharpe, 1918) (source of synonymy)
Alteutha austrina Scott T., 1912 accepted as Alteutha depressa (Baird, 1837) (basis of record)
Alteutha dubia Scott T., 1912 (basis of record)
Amallophora Scott T., 1894 accepted as Xanthocalanus Giesbrecht, 1893 (additional source)
Amallophora Scott T., 1894 accepted as Xanthocalanus Giesbrecht, 1893 (source of synonymy)
Amallophora obtusifrons Sars G.O., 1905 accepted as Scolecithricella obtusifrons (Sars G.O., 1905) accepted as Amallothrix obtusifrons (Sars G.O., 1905) accepted as Pseudoamallothrix obtusifrons (Sars G.O., 1905) (source of synonymy)
Amallophora rotunda Grice & Hulsemann, 1970 accepted as Xanthocalanus rotundus (Grice & Hulsemann, 1970) (source of synonymy)
Amallophora typica Scott T., 1894 accepted as Xanthocalanus typicus (Scott T., 1894) (source of synonymy)
Amallothrix fowleri (Farran, 1926) accepted as Bradfordiella fowleri (Farran, 1926) (basis of record)
Amallothrix laminata (Farran, 1926) accepted as Pseudoamallothrix laminata (Farran, 1926) (basis of record)
Amallothrix propinqua (Sars G.O., 1920) (basis of record)
Amallothrix spinata (Tanaka, 1962) (basis of record)
Amallothrix tenuiserrata (Giesbrecht, 1893) (basis of record)
Amallothrix valens (Farran, 1926) (basis of record)
Ambunguipes Huys, 1990 (additional source)
Ameira amphibia Brady, 1902 accepted as Nitokra typica Boeck, 1865 represented as Nitokra typica typica Boeck, 1865 (basis of record)
Ameira attenuata Thompson I.C., 1893 accepted as Filexilia attenuata (Thompson I.C., 1893) (basis of record)
Ameira brevipes pestae Petkovski, 1955 accepted as Ameira pestae Petkovski, 1955 accepted as Filexilia pestae (Petkovski, 1955) (basis of record)
Ameira faroensis Schriever, 1982 (basis of record)
Ameira gracile Scott A., 1896 accepted as Sicameira gracilis (Scott A., 1896) (basis of record)
Ameira leptoderma (Klie, 1950) accepted as Sicameira leptoderma Klie, 1950 (basis of record)
Ameira pestae Petkovski, 1955 accepted as Filexilia pestae (Petkovski, 1955) (basis of record)
Ameiropsis abbreviata Sars G.O., 1911 accepted as Biameiropsis abbreviata (Sars G.O., 1911) (source of synonymy)
Ameliotes Por, 1969 (source of synonymy)
Ameliotes Por, 1969 (basis of record)
Ameliotes mediterraneus (Soyer, 1970) accepted as Stratiopontotes mediterraneus Soyer, 1970 (basis of record)
Ameliotes mediterraneus (Soyer, 1970) accepted as Stratiopontotes mediterraneus Soyer, 1970 (source of synonymy)
Amonardia Lang, 1944 (additional source)
Amonardia forficula (Claus, 1863) accepted as Parastenhelia forficula (Claus, 1863) accepted as Parastenhelia spinosa (Fischer, 1860) represented as Parastenhelia spinosa spinosa (Fischer, 1860) (basis of record)
Amonardia littoralis (Sars G.O., 1911) accepted as Parastenhelia littoralis (Sars G.O., 1911) accepted as Microthalestris littoralis Sars G. O., 1911 (basis of record)
Amphiascoides Nicholls, 1941 (additional source)
Amphiascoides neglectus (Norman & Scott T., 1905) (basis of record)
Amphiascoides pygmaea (Norman & Scott T., 1905) (basis of record)
Amphiascopsis Gurney, 1927 (additional source)
Amphiascopsis gracilis (Lang, 1936) accepted as Sarsamphiascus gracilis (Lang, 1936) (basis of record)
Amphiascopsis hirtus (Gurney, 1927) accepted as Sarsamphiascus hirtus (Gurney, 1927) (basis of record)
Amphiascopsis minutus (Claus, 1863) accepted as Amphiascus minutus (Claus, 1863) accepted as Sarsamphiascus minutus (Claus, 1863) (basis of record)
Amphiascopsis obscurus (Sars G.O., 1906) accepted as Amphiascopsis cinctus (Claus, 1866) (basis of record)
Amphiascus Sars G.O., 1905 (additional source)
Amphiascus giesbrechti Sars G.O., 1906 (basis of record)
Amphiascus longirostris (Claus, 1863) accepted as Paramphiascopsis longirostris (Claus, 1863) (basis of record)
Amphiascus normani Sars G.O., 1911 accepted as Mesamphiascus normani (Sars G.O., 1911) accepted as Bulbamphiascus imus (Brady, 1872) (basis of record)
Amphiascus pallidus Sars G.O., 1906 (basis of record)
Amphiascus parvulus (Claus, 1866) (basis of record)
Amphiascus polapinquus Marcus, 1966 (basis of record)
Amphiascus scotti Sewell, 1924 accepted as Robertsonia propinqua (Scott T., 1894) (basis of record)
Amphiascus thalestroides Sars G.O., 1911 (basis of record)
Anapophysia Huys & Gee, 1996 (additional source)
Anchistrotos Brian, 1906 (additional source)
Anchistrotos laqueus Leigh-Sharpe, 1935 (basis of record)
Ancorabolidae Sars G.O., 1909 (additional source)
Anomalocera patersonii Templeton, 1837 (basis of record)
Antheacheres duebenii Sars M., 1857 (basis of record)
Antheacheridae Sars M., 1870 (additional source)
Aphanodomus Wilson C.B., 1924 (additional source)
Apodomyzon Stock, 1970 (additional source)
Apodopsyllus madrasensis (Krishnaswamy, 1951) (basis of record)
Apodopsyllus perplexus (Wells, 1963) (basis of record)
Apodopsyllus reductus (Petkovski, 1955) accepted as Apodopsyllus perplexus (Wells, 1963) (basis of record)
Archesola typhlops pontoica (Por, 1959) (additional source)
Archisenia Huys & Gee, 1993 (additional source)
Arctodiaptomus Kiefer, 1932 (basis of record)
Arctodiaptomus laticeps (Sars G.O., 1863) (basis of record)
Arenopontia nesaie Cottarelli, 1975 (basis of record)
Arenopontia problematica Masry, 1970 (basis of record)
Arenopontia subterranea Kunz, 1937 (basis of record)
Arenopontiidae Martínez Arbizu & Moura, 1994 (additional source)
Arenosetella monensis Moore, 1976 accepted as Arenosetella tenuissima (Klie, 1929) (basis of record)
Arenosetella palpilabra (Nicholls, 1935) accepted as Arenosetella tenuissima (Klie, 1929) (basis of record)
Argestigens uniremis Willey, 1935 (basis of record)
Argulus Müller O.F., 1785 (additional source)
Argulus stizostethii Kellicott, 1880 (basis of record)
Argulus vittatus (Rafinesque-Schmaltz, 1814) (basis of record)
Arietellidae Sars G.O., 1902 (additional source)
Artotrogus gladiator (Giesbrecht, 1899) (basis of record)
Artotrogus lilljeborgii (Boeck, 1859) accepted as Asterocheres lilljeborgi Boeck, 1859 (basis of record)
Ascidicolidae Thorell, 1859 (additional source)
Astericola clausii Rosoll, 1888 (basis of record)
Asterocheres asterocheres (Sars G.O., 1915) accepted as Asterocheres lilljeborgi Boeck, 1859 (basis of record)
Asterocheres boeckii (Brady, 1880) (basis of record)
Asterocheres madeirensis Bandera, Conradi & López-González, 2007 (basis of record)
Asterocheres simulans (Scott T., 1898) (basis of record)