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The Sombre Tit (Poecile lugubris) is a member of the tit family found in southeast Europe
Europe

Europe is, conventionally, one of the world's seven continents. Comprising the westernmost peninsula of Eurasia, Europe is generally divided from Asia to its east by the water divide of the Ural Mountains, the Ural , the Caspian Sea, and by the Caucasus Mountains to the southeast....
 and southwest Asia
Asia

Asia is the world's largest and most populous continent. It covers 8.6% of the Earth's total surface area and, with over 4 billion people, it contains more than 60% of the world's current human population....
.

Though it is traditionally placed in Parus, mtDNA cytochrome b
Cytochrome b

Cytochrome b/b6 is main subunit of transmembrane cytochrome bc1 complex and Cytochrome b6f complex complexes.In the mitochondrion of eukaryotes and in aerobic prokaryotes, cytochrome b is a component of respiratory chain complex III - also known as the bc1 complex or ubiquinol-cytochrome c reductase....
 sequence
DNA sequence

A DNA sequence or genetic sequence is a succession of letters representing the primary structure of a real or hypothetical DNA molecule or strand, with the capacity to carry information as described by the central dogma of molecular biology....
 data suggests that that genus
Genus

A genus is a low-level taxonomic rank used in the classification of living and fossil organisms. The taxonomic ranks are domain , kingdom , phylum, class , order , family , genus, and species....
 should be split, as already adopted by the American Ornithologists' Union
American Ornithologists' Union

The American Ornithologists' Union is an ornithology organization in the USA. Unlike the National Audubon Society, its members are primarily professional ornithologists rather than amateur birdwatching....
, for example. This species is part of the chickadee group, which would then make up the genus Poecile. In Poecile, this species forms part of a group of apparently rather basal
Basal (phylogenetics)

In phylogenetics, a basal clade is the earliest clade to branch in a larger clade; it appears at the base of a cladogram.A basal group form an outgroup to the rest of the clade, such as in the following example:...
 species, the relationships of which are ill-defined.






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The Sombre Tit (Poecile lugubris) is a member of the tit family found in southeast Europe
Europe

Europe is, conventionally, one of the world's seven continents. Comprising the westernmost peninsula of Eurasia, Europe is generally divided from Asia to its east by the water divide of the Ural Mountains, the Ural , the Caspian Sea, and by the Caucasus Mountains to the southeast....
 and southwest Asia
Asia

Asia is the world's largest and most populous continent. It covers 8.6% of the Earth's total surface area and, with over 4 billion people, it contains more than 60% of the world's current human population....
.

Though it is traditionally placed in Parus, mtDNA cytochrome b
Cytochrome b

Cytochrome b/b6 is main subunit of transmembrane cytochrome bc1 complex and Cytochrome b6f complex complexes.In the mitochondrion of eukaryotes and in aerobic prokaryotes, cytochrome b is a component of respiratory chain complex III - also known as the bc1 complex or ubiquinol-cytochrome c reductase....
 sequence
DNA sequence

A DNA sequence or genetic sequence is a succession of letters representing the primary structure of a real or hypothetical DNA molecule or strand, with the capacity to carry information as described by the central dogma of molecular biology....
 data suggests that that genus
Genus

A genus is a low-level taxonomic rank used in the classification of living and fossil organisms. The taxonomic ranks are domain , kingdom , phylum, class , order , family , genus, and species....
 should be split, as already adopted by the American Ornithologists' Union
American Ornithologists' Union

The American Ornithologists' Union is an ornithology organization in the USA. Unlike the National Audubon Society, its members are primarily professional ornithologists rather than amateur birdwatching....
, for example. This species is part of the chickadee group, which would then make up the genus Poecile. In Poecile, this species forms part of a group of apparently rather basal
Basal (phylogenetics)

In phylogenetics, a basal clade is the earliest clade to branch in a larger clade; it appears at the base of a cladogram.A basal group form an outgroup to the rest of the clade, such as in the following example:...
 species, the relationships of which are ill-defined. They also include the Varied
Varied Tit

The Varied Tit is a perching bird from the tit family , Paridae. It occurs in eastern Asia in Japan, Korea, Taiwan, and locally in northeastern China and extreme southeastern Russia ....
 and probably the White-fronted Tit
White-fronted Tit

The White-fronted Tit is a species of bird in the Paridae family.It is Endemism to the Philippines....
 (which were sometimes separated in Sittiparus), and possibly the White-browed
White-browed Tit

The White-browed Tit is a species of bird in the tit family tit . It is endemism to the mountain forests of southwestern China .It is 13.5?14 cm long, with a weight of 10?12 g....
 and Caspian Tit
Caspian Tit

The Caspian Tit is a passerine bird in the tit family. It is often lumped with Sombre Tit Poecile lugubris , but some research suggests that it is a separate species, more closely related to Willow Tit and Songar Tits ....
s.(Gill et al., 2005 )