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In page Vireo:
"The family can be conveniently though perhaps inaccurately categorised by genus as the true vireos, the greenlets, the shrike-vireos and the peppershrikes. Preliminary genetic studies by Johnson et al. revealed large interspecific genetic distances between clades within Vireo and Hylophilus of a similar magnitude to differences between Cyclarhis and Vireolanius. Furthermore, some vireo and greenlet species may be closer to the peppershrikes than to their respective congeners. A more comprehensive study may reveal this family to be considerably undersplit at both the generic and species level.
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