Assertion: bufflehead | /r/HasProperty | treated as the only member of the genus
Facets:
value: formerly
type: TEMPORAL
Source sentences:
text: 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.