P. L. Sclater and Salvin, 1871,
Lion Hill, Canal Zone, Panama.
Closely related to T. melanocephalus, T. citreolus and T. bairdii; sometimes considered conspecific with T. bairdii. DNA studies suggest that present species may in fact be closer to T. violaceus and T. curucui#R. Until recently considered conspecific with T. viridis, but back purplish-blue vs deep green-blue (extensive area between purplish-blue mantle and rump), i.e. uniform from mantle to rump in chionurus, two colours in viridis, and in viridis the back showing up as bronzy yellow at certain light angles, not so in chionurus (2); crown blacker and more matt, much less shot with purplish-blue (2); outer tail all white vs white with black basal half on inner web (making a black V-mark below orange-yellow vent) (2); supposedly different structure to song (“strikingly different”#R), accelerating and dropping rather than remaining constant#R (score at least 1). Monotypic.
Atlantic slope of W Panama, from Bocas del Toro E through Canal Zone (whence on both slopes) to Colombia W of E Andes, and W Ecuador.
Food and feeding
Status and conservation
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