Black-crested Tit © flickr.com

Coal Tit (Periparus ater) (Sibley and Monroe 1990, 1993) and Black-crested Tit (Parus melanolophus) (Sibley and Monroe 1990, 1993) have been lumped following Eck and Martens (2006) because they interbreed with and share morphological features with intergrade subspecies martensi of Coal Tit (Periparus ater). The BirdLife Taxonomic Working Group is aware that phylogenetic analyses have been published which have proposed generic rearrangements which may affect this species, but prefers to wait until work by other taxonomists reveals how these changes affect the entire groups involved.

Forms a superspecies with Coal Tit (Periparus ater), and the two regularly hybridize in western Nepal. Sometimes considered conspecific. Birds from north-eastern Afghanistan and adjacent Pakistan, slightly larger and with darker upperparts than those elsewhere in species' range, may merit subspecific recognition. Further research required.


References
See References.


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