the bufflehead was formerly treated as the only member of the genus (sometimes unnecessarily changed to "charitonetta") while the goldeneyes were incorrectly placed in "clangula" (as "clangula americana"), the genus of the long-tailed duck, which at that time was placed in "harelda". it may yet be correct to recognise two genera, as the bufflehead and the two goldeneyes are well diverged. in this case, "bucephala" would be restricted to "b. albeola" and the name "glaucionetta" (stejneger, 1885) resurrected for the goldeneyes.