This plot again show taxa arrainged by year of description (Y-axis). They are grouped along the X-axis by the numbering system applied by Sibley & Monroe, and previously by the AOU.
This divides taxa into broad geographic groupings. Superimposed on this, are color coded letters indicating the authors of the taxa.
Linnaeus 715 Sclater, PL 430 Vieillot 388 Gould 385 Gmelin,JF 356