Acartiidae Sars G.O., 1903 (additional source)
Advena paradoxa (Beneden, 1851) accepted as Kabatazus paradoxus (Beneden, 1851) (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 (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 globosa (Leigh-Sharpe, 1918) accepted as Neoalbionella globosa (Leigh-Sharpe, 1918) (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)
Ambunguipes Huys, 1990 (additional source)
Ameira gracilis 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)
Ameiropsis abbreviata Sars G.O., 1911 accepted as Biameiropsis abbreviata (Sars G.O., 1911) (source of synonymy)
Ameliotes Por, 1969 (source of synonymy)
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 littoralis (Sars G.O., 1911) accepted as Parastenhelia littoralis (Sars G.O., 1911) accepted as Microthalestris littoralis Sars G. O., 1911 (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 parvulus (Claus, 1866) (basis of record)
Amphiascus thalestroides Sars G.O., 1911 (basis of record)
Anapophysia Huys & Gee, 1996 (additional source)
Anchistrotos Brian, 1906 (additional source)
Aphanodomus Wilson C.B., 1924 (additional source)
Apodomyzon Stock, 1970 (additional source)
Apodopsyllus madrasensis (Krishnaswamy, 1951) (basis of record)
Archisenia Huys & Gee, 1993 (additional source)
Arenopontiidae Martínez Arbizu & Moura, 1994 (additional source)
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)
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)
Asterocheres asterocheres (Sars G.O., 1915) accepted as Asterocheres lilljeborgi Boeck, 1859 (basis of record)
Asterocheres thorelli (Sars G.O., 1879) accepted as Dermatomyzon nigripes (Brady & Robertson, 1880) represented as Dermatomyzon nigripes nigripes (Brady & Robertson, 1876) (basis of record)
Asterocheres ventricosus (Brian, 1928) accepted as Setacheres ventricosus (Brian, 1928) (basis of record)
Axinophilus Bresciani & Ockelmann, 1966 (additional source)
Bathycamptus Huys & Thistle, 1989 (source of synonymy)
Bathycamptus minutus (Wells, 1965) (source of synonymy)
Bathypsammis Huys & Gee, 1993 (additional source)
Biameiropsis abbreviata (Sars G.O., 1911) (basis of record)
Botryllophilus Hesse, 1864 (additional source)
Boxshallia Huys, 1988 (additional source)
Bradya armifera (Scott T. & Scott A., 1896) (basis of record)
Bradya dilatata Sars G.O., 1904 accepted as Parabradya dilatata (Sars G.O., 1904) (basis of record)
Bryaxis Sars G.O., 1901 accepted as Bryaxona Strand, 1929 accepted as Comantenna Wilson C.B., 1924 (source of synonymy)
Bryaxis minor Farran, 1905 accepted as Paracomantenna minor (Farran, 1905) (source of synonymy)
Bryaxona Strand, 1929 accepted as Comantenna Wilson C.B., 1924 (source of synonymy)
Bulbamphiascus Lang, 1944 (additional source)
Buproridae Thorell, 1859 (additional source)
Caligidae Burmeister, 1835 (additional source)
Caligopsis ponticus Markevich, 1940 accepted as Markevichus ponticus (Markevich, 1940) (source of synonymy)
Calverocheres Wilson C.B., 1932 (additional source)
Catiniidae Bocquet & Stock, 1957 (additional source)
Cecropidae Dana, 1852-1853 accepted as Pandaridae Milne Edwards, 1840 (additional source)
Centropagidae Giesbrecht, 1892 (additional source)
Cervinia Norman in Brady, 1878 (additional source)
Cerviniella Smirnov, 1946 (additional source)
Cerviniopsis Sars G.O., 1903 (additional source)
Chirundina parvispina (Farran, 1908) accepted as Pseudochirella cryptospina (Sars G.O., 1905) (basis of record)
Cholydiella intermedia (Bresciani, 1970) accepted as Cholidyella intermedia (Bresciani, 1970) (source of synonymy)
Clavellotis dilatata (Krøyer, 1863) (basis of record)
Cletodidae Scott T., 1904 (additional source)
Clytemnestra Dana, 1848 (additional source)
Colobomatus doederleini (Richiardi, 1883) accepted as Colobomatus doderleini (Richiardi, 1883) (basis of record)
Colobomatus grubei (Richiardi, 1877) (additional source)
Corallicletodes aberrans (Marinov, 1973) (basis of record)
Corina Giesbrecht, 1891 accepted as Vettoria Wilson C.B., 1924 (source of synonymy)
Corina granulosa Giesbrecht, 1891 accepted as Vettoria granulosa (Giesbrecht, 1891) (source of synonymy)
Corycella rostrata (Claus, 1863) accepted as Farranula rostrata (Claus, 1863) (source of synonymy)
Critomolgus trispinosus (Stock, 1959) (basis of record)
Cyclopetta Sars G.O., 1913 (additional source)
Cyclopicina Lindberg, 1953 (additional source)
Cyclopicina brachystylis (Sars G.O., 1921) accepted as Cyclopina brachystylis Sars G.O., 1921 (basis of record)
Cyclopicina crassisetosa (Herbst, 1953) accepted as Cyclopina crassisetosa Herbst, 1953 (basis of record)
Cyclopicina norvegica (Boeck, 1865) accepted as Cyclopina norvegica Boeck, 1865 (basis of record)
Cyclopicina pygmaea (Sars G.O., 1918) accepted as Cyclopina pygmaea Sars G.O., 1918 (basis of record)
Cyclopicina rotundipes (Herbst, 1952) accepted as Cyclopina rotundipes Herbst, 1952 (basis of record)
Cyclopidae Rafinesque, 1815 (additional source)
Cyclopidina euacantha (Sars G.O., 1918) (basis of record)
Cyclopinella Sars G.O., 1913 (additional source)
Cyclopinoides Lindberg, 1953 (additional source)
Cyclopinoides dilatata (Sars G.O., 1921) (basis of record)
Cyclopinotus eximius (Monchenko, 1982) (basis of record)
Cycloporella eximia Monchenko, 1981 accepted as Cyclopinotus eximius (Monchenko, 1982) (source of synonymy)
Cylindronannopus Coull, 1973 (additional source)
Cymbasoma danae (Malaquin, 1896) (basis of record)
Cymbasoma roscovita (Malaquin, 1901) accepted as Monstrilla roscovita (Malaquin, 1901) (basis of record)