The genus is named after C. Leo Biden, who collected one of the type specimens of ''
Bidenichthys capensis
''Bidenichthys capensis'', the freetail brotula, is an uncommon South African fish of the family Bythitidae, and one of three species, and the type species, of the genus Bidenichthys. The species is found in intertidal zone
The intertidal ...
There are currently three recognized species in this genus:
* ''
Bidenichthys beeblebroxi
''Bidenichthys beeblebroxi'' is a species of common reef fish of the family (biology), family Bythitidae, and one of three species in the genus ''Bidenichthys''. The species is found in the coastal waters off North Island and northern South Islan ...
'' Paulin, 1995: "Found in holes beneath rocks and boulders from the surface to 30 m around the North Island and northern part of South Island, New Zealand. Common."
* ''
Bidenichthys capensis
''Bidenichthys capensis'', the freetail brotula, is an uncommon South African fish of the family Bythitidae, and one of three species, and the type species, of the genus Bidenichthys. The species is found in intertidal zone
The intertidal ...
'' Barnard, 1934 (Freetail brotula): The type species for the genus; "intertidal in rocky tidepools from East London to the Cape of Good Hope, South Africa. Uncommon."
* ''
Bidenichthys consobrinus
The grey brotula or orange cuskeel (''Bidenichthys consobrinus'') is a rare species of viviparous brotula found around northern New Zealand
New Zealand ( mi, Aotearoa ) is an island country in the southwestern Pacific Ocean. It consi ...
'' ( F. W. Hutton, 1876) (Grey brotula): "Rocky areas at depths of 30 to 178 m off northern New Zealand. Rare."
* '' Bidenichthys okamotoi''
Møller Møller is a Danish surname, referring to an occupation as a Miller, equivalent of the Scottish/English '' Miller'', the German ''Müller'' etc.
Møller is the twentieth commonest surname in Denmark.Schwarzhans, Lauridsen & Nielsen, 2021Møller, Peter R., Werner W. Schwarzhans, Henrik Lauridsen, and Jørgen G. Nielsen. 2021. "Bidenichthys okamotoi, a New Species of the Bythitidae (Ophidiiformes, Teleostei) from the Koko Seamount, Central North Pacific" Journal of Marine Science and Engineering 9, no. 12: 1399. https://doi.org/10.3390/jmse9121399