It is closely related to, and forms a superspecies with, the pink-headed warbler of southern Mexico and Guatemala.
32.
It is one of four species in the genus " Melipotes ", all closely related and forming a superspecies.
33.
The species forms a superspecies with a number of related and similar looking island and mainland myzomelas across the Pacific and Australasia.
34.
Also, there is another superspecies in sub-Saharan Africa, three white-throated species with a black breast-band.
35.
It is closely related to common yellowthroat, Belding's yellowthroat, and Bahama yellowthroat, with which it forms a superspecies.
36.
The red warbler forms a superspecies with the pink-headed warbler of Chiapas and Guatemala, to which it is closely related.
37.
Secondly, a recent cariological study shows " Nannospalax leucodon " is a superspecies consisting of several cariologically dinstinct cryptic species.
38.
Nine subspecies are recognised across its range, and it forms a superspecies with the Sunda warbler and the Yellow-breasted warbler.
39.
Within the genus, the western and eastern nicators are considered to form a superspecies and are sometimes treated as the same species.
40.
Members of the red-breasted nuthatch superspecies excavate their own tree holes, although most other nuthatches use natural holes or old woodpecker nests.
