Two specimens from the Koko Seamount (Koko Guyot), in Hawaiian-Emperor seamount chain, Central North Pacific, caught 2009 and 2010 are here described as a new species, Bidenichthys okamotoi. The taxonomy of species genera Barnard, 1934, Fiordichthys Paulin, 1995, has been confusing due to lost type B. consorbrinus (Hutton, 1876) rarity some species. Following synonymization with by Møller Niels...