Naming
* Ultramarine tit Bonaparte, 1841 ;⤷ Libyan blue tit Hartert, 1922;
⤷ Canary Islands blue tits ''
⤷ *The Canary Islands group would contain five subspecies (''palmensis'', ''ombriosus'', ''degener'', ''teneriffae'', and ''hedwigae''.
The Canary Islands subspecies has a black cap, and the African form has a blue back. Research is underway to split these populations into distinct species, with a peculiar "leapfrog" distribution:
Research published in 2007 found that African blue tits on the eastern Canary Islands of Fuerteventura and Lanzarote are indistinguishable from those in North Africa and so the subspecies ''degener'' should be regarded as a synonym of ''ultramarinus''.
References:
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