Page "Olive Warbler" Paragraph 3

The Olive Warbler was originally placed in the New World warbler ( family Parulidae ) genus Dendroica, a group which it closely resembles, particularly in having nine primaries and similar skin.

In spite of being assigned to its own genus in 1875, its affinities were a source of contention.

The shape of the basihyal bone in the skull, and aspects of its behaviour led to the suggestion that it was instead an Old World warbler in the family Sylviidae.

That it was not in the family Parulidae was supported by the arrangement of muscles in the legs.

DNA-DNA hybridization placed the Olive Warbler as an early branch of the finch clade ( which included the finches, cardinals and Hawaiian honeycreepers ) and the New World sparrow clade ( which includes the tanagers, icterids and New world warblers ), and a 1998 study of mitochondrial DNA confirmed its status as being far removed from the New world warblers.