Gaetanus Giesbrecht, 1888 (additional source)
Gaetanus antarcticus Wolfenden, 1905 accepted as Gaetanus kruppii Giesbrecht, 1903 (source of synonymy)
Gaetanus armiger Giesbrecht, 1888 (additional source)
Gaetanus brevicornis Esterly, 1906 (additional source)
Gaetanus campbellae Park, 1975 accepted as Gaetanus simplex Brodsky, 1950 (new combination reference)
Gaetanus intermedius Campbell, 1930 accepted as Gaetanus campbellae Park, 1975 accepted as Gaetanus simplex Brodsky, 1950 (source of synonymy)
Gaetanus kruppii Giesbrecht, 1903 (additional source)
Gaetanus miles Giesbrecht, 1888 (additional source)
Gaetanus minor Farran, 1905 (additional source)
Gaetanus minutus (Sars G.O., 1907) (additional source)
Gaetanus pileatus Farran, 1903 (additional source)
Gaetanus tenuispinus (Sars G.O., 1900) (additional source)
Gaidius Giesbrecht, 1895 accepted as Gaetanus Giesbrecht, 1888 (additional source)
Gaidius Giesbrecht, 1895 accepted as Gaetanus Giesbrecht, 1888 (source of synonymy)
Gaidius affinis Sars G.O., 1905 accepted as Gaetanus affinis (Sars G.O., 1905) accepted as Gaetanus brevispinus (Sars G.O., 1900) (source of synonymy)
Gaidius brevispinus (Sars G.O., 1900) accepted as Gaetanus brevispinus (Sars G.O., 1900) (source of synonymy)
Gaidius columbiae Park, 1967 accepted as Gaetanus columbiae (Park, 1967) accepted as Gaetanus minutus (Sars G.O., 1907) (source of synonymy)
Gaidius pungens Giesbrecht, 1895 accepted as Gaetanus pungens (Giesbrecht, 1895) (source of synonymy)
Gaidius tenuispinus (Sars G.O., 1900) accepted as Gaetanus tenuispinus (Sars G.O., 1900) (source of synonymy)
Gaidius variabilis Brodsky, 1950 accepted as Gaetanus variabilis (Brodsky, 1950) accepted as Gaetanus minutus (Sars G.O., 1907) (source of synonymy)