Synonyms:
Gaetanus Giesbrecht, 1888: 335; Markhaseva, 1996: 176.
Gaidius Giesbrecht, 1895: 349 (type species: Gaidius pungens Giesbrecht, 1895, by monotypy).
Mesogaidius Wolfenden, 1911: 223 (type species: Gaidius intermedius Wolfenden, 1905, designated in Markhaseva, 1996).
Pseudogaetanus Brodsky, 1950: 168 (type species: Gaetanus robustus Sars, 1905, by monotypy).