Assertion: tern | /r/HasProperty | treated with just a few dark species
Facets:
value: as belonging to one large genus
type: OTHER
value: formerly
type: TEMPORAL
Source sentences:
text: Most terns were formerly treated as belonging to one large genus, Sterna, with just a few dark species placed in other genera; in 1959, only the noddies and the Inca tern were excluded from Sterna.